Source

emacs / src / process.c

Full commit
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
5894
5895
5896
5897
5898
5899
5900
5901
5902
5903
5904
5905
5906
5907
5908
5909
5910
5911
5912
5913
5914
5915
5916
5917
5918
5919
5920
5921
5922
5923
5924
5925
5926
5927
5928
5929
5930
5931
5932
5933
5934
5935
5936
5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
5993
5994
5995
5996
5997
5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
6144
6145
6146
6147
6148
6149
6150
6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
6212
6213
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
6225
6226
6227
6228
6229
6230
6231
6232
6233
6234
6235
6236
6237
6238
6239
6240
6241
6242
6243
6244
6245
6246
6247
6248
6249
6250
6251
6252
6253
6254
6255
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
6284
6285
6286
6287
6288
6289
6290
6291
6292
6293
6294
6295
6296
6297
6298
6299
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
6316
6317
6318
6319
6320
6321
6322
6323
6324
6325
6326
6327
6328
6329
6330
6331
6332
6333
6334
6335
6336
6337
6338
6339
6340
6341
6342
6343
6344
6345
6346
6347
6348
6349
6350
6351
6352
6353
6354
6355
6356
6357
6358
6359
6360
6361
6362
6363
6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
6380
6381
6382
6383
6384
6385
6386
6387
6388
6389
6390
6391
6392
6393
6394
6395
6396
6397
6398
6399
6400
6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
6412
6413
6414
6415
6416
6417
6418
6419
6420
6421
6422
6423
6424
6425
6426
6427
6428
6429
6430
6431
6432
6433
6434
6435
6436
6437
6438
6439
6440
6441
6442
6443
6444
6445
6446
6447
6448
6449
6450
6451
6452
6453
6454
6455
6456
6457
6458
6459
6460
6461
6462
6463
6464
6465
6466
6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
6491
6492
6493
6494
6495
6496
6497
6498
6499
6500
6501
6502
6503
6504
6505
6506
6507
6508
6509
6510
6511
6512
6513
6514
6515
6516
6517
6518
6519
6520
6521
6522
6523
6524
6525
6526
6527
6528
6529
6530
6531
6532
6533
6534
6535
6536
6537
6538
6539
6540
6541
6542
6543
6544
6545
6546
6547
6548
6549
6550
6551
6552
6553
6554
6555
6556
6557
6558
6559
6560
6561
6562
6563
6564
6565
6566
6567
6568
6569
6570
6571
6572
6573
6574
6575
6576
6577
6578
6579
6580
6581
6582
6583
6584
6585
6586
6587
6588
6589
6590
6591
6592
6593
6594
6595
6596
6597
6598
6599
6600
6601
6602
6603
6604
6605
6606
6607
6608
6609
6610
6611
6612
6613
6614
6615
6616
6617
6618
6619
6620
6621
6622
6623
6624
6625
6626
6627
6628
6629
6630
6631
6632
6633
6634
6635
6636
6637
6638
6639
6640
6641
6642
6643
6644
6645
6646
6647
6648
6649
6650
6651
6652
6653
6654
6655
6656
6657
6658
6659
6660
6661
6662
6663
6664
6665
6666
6667
6668
6669
6670
6671
6672
6673
6674
6675
6676
6677
6678
6679
6680
6681
6682
6683
6684
6685
6686
6687
6688
6689
6690
6691
6692
6693
6694
6695
6696
6697
6698
6699
6700
6701
6702
6703
6704
6705
6706
6707
6708
6709
6710
6711
6712
6713
6714
6715
6716
6717
6718
6719
6720
6721
6722
6723
6724
6725
6726
6727
6728
6729
6730
6731
6732
6733
6734
6735
6736
6737
6738
6739
6740
6741
6742
6743
6744
6745
6746
6747
6748
6749
6750
6751
6752
6753
6754
6755
6756
6757
6758
6759
6760
6761
6762
6763
6764
6765
6766
6767
6768
6769
6770
6771
6772
6773
6774
6775
6776
6777
6778
6779
6780
6781
6782
6783
6784
6785
6786
6787
6788
6789
6790
6791
6792
6793
6794
6795
6796
6797
6798
/* Asynchronous subprocess control for GNU Emacs.
   Copyright (C) 1985, 86, 87, 88, 93, 94, 95, 96, 98, 1999,
      2001, 2002, 2003 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */


#include <config.h>
#include <signal.h>

/* This file is split into two parts by the following preprocessor
   conditional.  The 'then' clause contains all of the support for
   asynchronous subprocesses.  The 'else' clause contains stub
   versions of some of the asynchronous subprocess routines that are
   often called elsewhere in Emacs, so we don't have to #ifdef the
   sections that call them.  */


#ifdef subprocesses

#include <stdio.h>
#include <errno.h>
#include <setjmp.h>
#include <sys/types.h>		/* some typedefs are used in sys/file.h */
#include <sys/file.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#if defined(WINDOWSNT) || defined(UNIX98_PTYS)
#include <stdlib.h>
#include <fcntl.h>
#endif /* not WINDOWSNT */

#ifdef HAVE_SOCKETS	/* TCP connection support, if kernel can do it */
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef NEED_NET_ERRNO_H
#include <net/errno.h>
#endif /* NEED_NET_ERRNO_H */

/* Are local (unix) sockets supported?  */
#if defined (HAVE_SYS_UN_H) && !defined (NO_SOCKETS_IN_FILE_SYSTEM)
#if !defined (AF_LOCAL) && defined (AF_UNIX)
#define AF_LOCAL AF_UNIX
#endif
#ifdef AF_LOCAL
#define HAVE_LOCAL_SOCKETS
#include <sys/un.h>
#endif
#endif
#endif /* HAVE_SOCKETS */

/* TERM is a poor-man's SLIP, used on GNU/Linux.  */
#ifdef TERM
#include <client.h>
#endif

/* On some systems, e.g. DGUX, inet_addr returns a 'struct in_addr'. */
#ifdef HAVE_BROKEN_INET_ADDR
#define IN_ADDR struct in_addr
#define NUMERIC_ADDR_ERROR (numeric_addr.s_addr == -1)
#else
#define IN_ADDR unsigned long
#define NUMERIC_ADDR_ERROR (numeric_addr == -1)
#endif

#if defined(BSD_SYSTEM) || defined(STRIDE)
#include <sys/ioctl.h>
#if !defined (O_NDELAY) && defined (HAVE_PTYS) && !defined(USG5)
#include <fcntl.h>
#endif /* HAVE_PTYS and no O_NDELAY */
#endif /* BSD_SYSTEM || STRIDE */

#ifdef BROKEN_O_NONBLOCK
#undef O_NONBLOCK
#endif /* BROKEN_O_NONBLOCK */

#ifdef NEED_BSDTTY
#include <bsdtty.h>
#endif

#ifdef IRIS
#include <sys/sysmacros.h>	/* for "minor" */
#endif /* not IRIS */

#ifdef HAVE_SYS_WAIT
#include <sys/wait.h>
#endif

#include "systime.h"
#include "systty.h"

#include "lisp.h"
#include "window.h"
#include "buffer.h"
#include "character.h"
#include "coding.h"
#include "process.h"
#include "termhooks.h"
#include "termopts.h"
#include "commands.h"
#include "keyboard.h"
#include "frame.h"
#include "blockinput.h"
#include "dispextern.h"
#include "composite.h"
#include "atimer.h"

Lisp_Object Qprocessp;
Lisp_Object Qrun, Qstop, Qsignal;
Lisp_Object Qopen, Qclosed, Qconnect, Qfailed, Qlisten;
Lisp_Object Qlocal, Qdatagram;
Lisp_Object QCname, QCbuffer, QChost, QCservice, QCtype;
Lisp_Object QClocal, QCremote, QCcoding;
Lisp_Object QCserver, QCnowait, QCnoquery, QCstop;
Lisp_Object QCsentinel, QClog, QCoptions, QCplist;
Lisp_Object QCfilter_multibyte;
Lisp_Object Qlast_nonmenu_event;
/* QCfamily is declared and initialized in xfaces.c,
   QCfilter in keyboard.c.  */
extern Lisp_Object QCfamily, QCfilter;

/* Qexit is declared and initialized in eval.c.  */

/* QCfamily is defined in xfaces.c.  */
extern Lisp_Object QCfamily;
/* QCfilter is defined in keyboard.c.  */
extern Lisp_Object QCfilter;

/* a process object is a network connection when its childp field is neither
   Qt nor Qnil but is instead a property list (KEY VAL ...).  */

#ifdef HAVE_SOCKETS
#define NETCONN_P(p) (GC_CONSP (XPROCESS (p)->childp))
#define NETCONN1_P(p) (GC_CONSP ((p)->childp))
#else
#define NETCONN_P(p) 0
#define NETCONN1_P(p) 0
#endif /* HAVE_SOCKETS */

/* Define first descriptor number available for subprocesses.  */
#ifdef VMS
#define FIRST_PROC_DESC 1
#else /* Not VMS */
#define FIRST_PROC_DESC 3
#endif

/* Define SIGCHLD as an alias for SIGCLD.  There are many conditionals
   testing SIGCHLD.  */

#if !defined (SIGCHLD) && defined (SIGCLD)
#define SIGCHLD SIGCLD
#endif /* SIGCLD */

#include "syssignal.h"

#include "syswait.h"

extern void set_waiting_for_input P_ ((EMACS_TIME *));

#ifndef USE_CRT_DLL
extern int errno;
#endif
#ifdef VMS
extern char *sys_errlist[];
#endif

#ifndef HAVE_H_ERRNO
extern int h_errno;
#endif

/* t means use pty, nil means use a pipe,
   maybe other values to come.  */
static Lisp_Object Vprocess_connection_type;

#ifdef SKTPAIR
#ifndef HAVE_SOCKETS
#include <sys/socket.h>
#endif
#endif /* SKTPAIR */

/* These next two vars are non-static since sysdep.c uses them in the
   emulation of `select'.  */
/* Number of events of change of status of a process.  */
int process_tick;
/* Number of events for which the user or sentinel has been notified.  */
int update_tick;

/* Define NON_BLOCKING_CONNECT if we can support non-blocking connects.  */

#ifdef BROKEN_NON_BLOCKING_CONNECT
#undef NON_BLOCKING_CONNECT
#else
#ifndef NON_BLOCKING_CONNECT
#ifdef HAVE_SOCKETS
#ifdef HAVE_SELECT
#if defined (HAVE_GETPEERNAME) || defined (GNU_LINUX)
#if defined (O_NONBLOCK) || defined (O_NDELAY)
#if defined (EWOULDBLOCK) || defined (EINPROGRESS)
#define NON_BLOCKING_CONNECT
#endif /* EWOULDBLOCK || EINPROGRESS */
#endif /* O_NONBLOCK || O_NDELAY */
#endif /* HAVE_GETPEERNAME || GNU_LINUX */
#endif /* HAVE_SELECT */
#endif /* HAVE_SOCKETS */
#endif /* NON_BLOCKING_CONNECT */
#endif /* BROKEN_NON_BLOCKING_CONNECT */

/* Define DATAGRAM_SOCKETS if datagrams can be used safely on
   this system.  We need to read full packets, so we need a
   "non-destructive" select.  So we require either native select,
   or emulation of select using FIONREAD.  */

#ifdef BROKEN_DATAGRAM_SOCKETS
#undef DATAGRAM_SOCKETS
#else
#ifndef DATAGRAM_SOCKETS
#ifdef HAVE_SOCKETS
#if defined (HAVE_SELECT) || defined (FIONREAD)
#if defined (HAVE_SENDTO) && defined (HAVE_RECVFROM) && defined (EMSGSIZE)
#define DATAGRAM_SOCKETS
#endif /* HAVE_SENDTO && HAVE_RECVFROM && EMSGSIZE */
#endif /* HAVE_SELECT || FIONREAD */
#endif /* HAVE_SOCKETS */
#endif /* DATAGRAM_SOCKETS */
#endif /* BROKEN_DATAGRAM_SOCKETS */

#ifdef TERM
#undef NON_BLOCKING_CONNECT
#undef DATAGRAM_SOCKETS
#endif


#include "sysselect.h"

extern int keyboard_bit_set P_ ((SELECT_TYPE *));

/* If we support a window system, turn on the code to poll periodically
   to detect C-g.  It isn't actually used when doing interrupt input.  */
#ifdef HAVE_WINDOW_SYSTEM
#define POLL_FOR_INPUT
#endif

/* Mask of bits indicating the descriptors that we wait for input on.  */

static SELECT_TYPE input_wait_mask;

/* Mask that excludes keyboard input descriptor (s).  */

static SELECT_TYPE non_keyboard_wait_mask;

/* Mask that excludes process input descriptor (s).  */

static SELECT_TYPE non_process_wait_mask;

/* Mask of bits indicating the descriptors that we wait for connect to
   complete on.  Once they complete, they are removed from this mask
   and added to the input_wait_mask and non_keyboard_wait_mask.  */

static SELECT_TYPE connect_wait_mask;

/* Number of bits set in connect_wait_mask.  */
static int num_pending_connects;

/* The largest descriptor currently in use for a process object.  */
static int max_process_desc;

/* The largest descriptor currently in use for keyboard input.  */
static int max_keyboard_desc;

/* Nonzero means delete a process right away if it exits.  */
static int delete_exited_processes;

/* Indexed by descriptor, gives the process (if any) for that descriptor */
Lisp_Object chan_process[MAXDESC];

/* Alist of elements (NAME . PROCESS) */
Lisp_Object Vprocess_alist;

/* Buffered-ahead input char from process, indexed by channel.
   -1 means empty (no char is buffered).
   Used on sys V where the only way to tell if there is any
   output from the process is to read at least one char.
   Always -1 on systems that support FIONREAD.  */

/* Don't make static; need to access externally.  */
int proc_buffered_char[MAXDESC];

/* Table of `struct coding-system' for each process.  */
static struct coding_system *proc_decode_coding_system[MAXDESC];
static struct coding_system *proc_encode_coding_system[MAXDESC];

#ifdef DATAGRAM_SOCKETS
/* Table of `partner address' for datagram sockets.  */
struct sockaddr_and_len {
  struct sockaddr *sa;
  int len;
} datagram_address[MAXDESC];
#define DATAGRAM_CHAN_P(chan)	(datagram_address[chan].sa != 0)
#define DATAGRAM_CONN_P(proc)	(PROCESSP (proc) && datagram_address[XINT (XPROCESS (proc)->infd)].sa != 0)
#else
#define DATAGRAM_CHAN_P(chan)	(0)
#define DATAGRAM_CONN_P(proc)	(0)
#endif

static Lisp_Object get_process ();
static void exec_sentinel ();

extern EMACS_TIME timer_check ();
extern int timers_run;

/* Maximum number of bytes to send to a pty without an eof.  */
static int pty_max_bytes;

extern Lisp_Object Vfile_name_coding_system, Vdefault_file_name_coding_system;

#ifdef HAVE_PTYS
#ifdef HAVE_PTY_H
#include <pty.h>
#endif
/* The file name of the pty opened by allocate_pty.  */

static char pty_name[24];
#endif

/* Compute the Lisp form of the process status, p->status, from
   the numeric status that was returned by `wait'.  */

Lisp_Object status_convert ();

void
update_status (p)
     struct Lisp_Process *p;
{
  union { int i; WAITTYPE wt; } u;
  u.i = XFASTINT (p->raw_status_low) + (XFASTINT (p->raw_status_high) << 16);
  p->status = status_convert (u.wt);
  p->raw_status_low = Qnil;
  p->raw_status_high = Qnil;
}

/*  Convert a process status word in Unix format to
    the list that we use internally.  */

Lisp_Object
status_convert (w)
     WAITTYPE w;
{
  if (WIFSTOPPED (w))
    return Fcons (Qstop, Fcons (make_number (WSTOPSIG (w)), Qnil));
  else if (WIFEXITED (w))
    return Fcons (Qexit, Fcons (make_number (WRETCODE (w)),
				WCOREDUMP (w) ? Qt : Qnil));
  else if (WIFSIGNALED (w))
    return Fcons (Qsignal, Fcons (make_number (WTERMSIG (w)),
				  WCOREDUMP (w) ? Qt : Qnil));
  else
    return Qrun;
}

/* Given a status-list, extract the three pieces of information
   and store them individually through the three pointers.  */

void
decode_status (l, symbol, code, coredump)
     Lisp_Object l;
     Lisp_Object *symbol;
     int *code;
     int *coredump;
{
  Lisp_Object tem;

  if (SYMBOLP (l))
    {
      *symbol = l;
      *code = 0;
      *coredump = 0;
    }
  else
    {
      *symbol = XCAR (l);
      tem = XCDR (l);
      *code = XFASTINT (XCAR (tem));
      tem = XCDR (tem);
      *coredump = !NILP (tem);
    }
}

/* Return a string describing a process status list.  */

Lisp_Object
status_message (status)
     Lisp_Object status;
{
  Lisp_Object symbol;
  int code, coredump;
  Lisp_Object string, string2;

  decode_status (status, &symbol, &code, &coredump);

  if (EQ (symbol, Qsignal) || EQ (symbol, Qstop))
    {
      char *signame;
      synchronize_system_messages_locale ();
      signame = strsignal (code);
      if (signame == 0)
	signame = "unknown";
      string = build_string (signame);
      string2 = build_string (coredump ? " (core dumped)\n" : "\n");
      SSET (string, 0, DOWNCASE (SREF (string, 0)));
      return concat2 (string, string2);
    }
  else if (EQ (symbol, Qexit))
    {
      if (code == 0)
	return build_string ("finished\n");
      string = Fnumber_to_string (make_number (code));
      string2 = build_string (coredump ? " (core dumped)\n" : "\n");
      return concat3 (build_string ("exited abnormally with code "),
		      string, string2);
    }
  else if (EQ (symbol, Qfailed))
    {
      string = Fnumber_to_string (make_number (code));
      string2 = build_string ("\n");
      return concat3 (build_string ("failed with code "),
		      string, string2);
    }
  else
    return Fcopy_sequence (Fsymbol_name (symbol));
}

#ifdef HAVE_PTYS

/* Open an available pty, returning a file descriptor.
   Return -1 on failure.
   The file name of the terminal corresponding to the pty
   is left in the variable pty_name.  */

int
allocate_pty ()
{
  register int c, i;
  int fd;

#ifdef PTY_ITERATION
  PTY_ITERATION
#else
  for (c = FIRST_PTY_LETTER; c <= 'z'; c++)
    for (i = 0; i < 16; i++)
#endif
      {
	struct stat stb;	/* Used in some PTY_OPEN.  */
#ifdef PTY_NAME_SPRINTF
	PTY_NAME_SPRINTF
#else
	sprintf (pty_name, "/dev/pty%c%x", c, i);
#endif /* no PTY_NAME_SPRINTF */

#ifdef PTY_OPEN
	PTY_OPEN;
#else /* no PTY_OPEN */
	{
# ifdef IRIS
	  /* Unusual IRIS code */
	  *ptyv = emacs_open ("/dev/ptc", O_RDWR | O_NDELAY, 0);
	  if (fd < 0)
	    return -1;
	  if (fstat (fd, &stb) < 0)
	    return -1;
# else /* not IRIS */
	  { /* Some systems name their pseudoterminals so that there are gaps in
	       the usual sequence - for example, on HP9000/S700 systems, there
	       are no pseudoterminals with names ending in 'f'.  So we wait for
	       three failures in a row before deciding that we've reached the
	       end of the ptys.  */
	    int failed_count = 0;
	    
	    if (stat (pty_name, &stb) < 0)
	      {
		failed_count++;
		if (failed_count >= 3)
		  return -1;
	      }
	    else
	      failed_count = 0;
	  }
#  ifdef O_NONBLOCK
	  fd = emacs_open (pty_name, O_RDWR | O_NONBLOCK, 0);
#  else
	  fd = emacs_open (pty_name, O_RDWR | O_NDELAY, 0);
#  endif
# endif /* not IRIS */
	}
#endif /* no PTY_OPEN */

	if (fd >= 0)
	  {
	    /* check to make certain that both sides are available
	       this avoids a nasty yet stupid bug in rlogins */
#ifdef PTY_TTY_NAME_SPRINTF
	    PTY_TTY_NAME_SPRINTF
#else
            sprintf (pty_name, "/dev/tty%c%x", c, i);
#endif /* no PTY_TTY_NAME_SPRINTF */
#ifndef UNIPLUS
	    if (access (pty_name, 6) != 0)
	      {
		emacs_close (fd);
# if !defined(IRIS) && !defined(__sgi)
		continue;
# else
		return -1;
# endif /* IRIS */
	      }
#endif /* not UNIPLUS */
	    setup_pty (fd);
	    return fd;
	  }
      }
  return -1;
}
#endif /* HAVE_PTYS */

Lisp_Object
make_process (name)
     Lisp_Object name;
{
  register Lisp_Object val, tem, name1;
  register struct Lisp_Process *p;
  char suffix[10];
  register int i;

  p = allocate_process ();

  XSETINT (p->infd, -1);
  XSETINT (p->outfd, -1);
  XSETFASTINT (p->pid, 0);
  XSETFASTINT (p->tick, 0);
  XSETFASTINT (p->update_tick, 0);
  p->raw_status_low = Qnil;
  p->raw_status_high = Qnil;
  p->status = Qrun;
  p->mark = Fmake_marker ();

  /* If name is already in use, modify it until it is unused.  */

  name1 = name;
  for (i = 1; ; i++)
    {
      tem = Fget_process (name1);
      if (NILP (tem)) break;
      sprintf (suffix, "<%d>", i);
      name1 = concat2 (name, build_string (suffix));
    }
  name = name1;
  p->name = name;
  XSETPROCESS (val, p);
  Vprocess_alist = Fcons (Fcons (name, val), Vprocess_alist);
  return val;
}

void
remove_process (proc)
     register Lisp_Object proc;
{
  register Lisp_Object pair;

  pair = Frassq (proc, Vprocess_alist);
  Vprocess_alist = Fdelq (pair, Vprocess_alist);

  deactivate_process (proc);
}

/* Setup coding systems of PROCESS.  */

void
setup_process_coding_systems (process)
     Lisp_Object process;
{
  struct Lisp_Process *p = XPROCESS (process);
  int inch = XINT (p->infd);
  int outch = XINT (p->outfd);
  Lisp_Object coding_system;

  if (inch < 0 || outch < 0)
    return;

  if (!proc_decode_coding_system[inch])
    proc_decode_coding_system[inch]
      = (struct coding_system *) xmalloc (sizeof (struct coding_system));
  coding_system = p->decode_coding_system;
  if (! NILP (p->filter))
    {
      if (NILP (p->filter_multibyte))
	coding_system = raw_text_coding_system (coding_system);
    }
  else if (BUFFERP (p->buffer))
    {
      if (NILP (XBUFFER (p->buffer)->enable_multibyte_characters))
	coding_system = raw_text_coding_system (coding_system);
    }
  setup_coding_system (coding_system, proc_decode_coding_system[inch]);

  if (!proc_encode_coding_system[outch])
    proc_encode_coding_system[outch]
      = (struct coding_system *) xmalloc (sizeof (struct coding_system));
  setup_coding_system (p->encode_coding_system,
		       proc_encode_coding_system[outch]);
}

DEFUN ("processp", Fprocessp, Sprocessp, 1, 1, 0,
       doc: /* Return t if OBJECT is a process.  */)
     (object)
     Lisp_Object object;
{
  return PROCESSP (object) ? Qt : Qnil;
}

DEFUN ("get-process", Fget_process, Sget_process, 1, 1, 0,
       doc: /* Return the process named NAME, or nil if there is none.  */)
     (name)
     register Lisp_Object name;
{
  if (PROCESSP (name))
    return name;
  CHECK_STRING (name);
  return Fcdr (Fassoc (name, Vprocess_alist));
}

DEFUN ("get-buffer-process", Fget_buffer_process, Sget_buffer_process, 1, 1, 0,
       doc: /* Return the (or a) process associated with BUFFER.
BUFFER may be a buffer or the name of one.  */)
     (buffer)
     register Lisp_Object buffer;
{
  register Lisp_Object buf, tail, proc;

  if (NILP (buffer)) return Qnil;
  buf = Fget_buffer (buffer);
  if (NILP (buf)) return Qnil;

  for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail))
    {
      proc = Fcdr (Fcar (tail));
      if (PROCESSP (proc) && EQ (XPROCESS (proc)->buffer, buf))
	return proc;
    }
  return Qnil;
}

/* This is how commands for the user decode process arguments.  It
   accepts a process, a process name, a buffer, a buffer name, or nil.
   Buffers denote the first process in the buffer, and nil denotes the
   current buffer.  */

static Lisp_Object
get_process (name)
     register Lisp_Object name;
{
  register Lisp_Object proc, obj;
  if (STRINGP (name))
    {
      obj = Fget_process (name);
      if (NILP (obj))
	obj = Fget_buffer (name);
      if (NILP (obj))
	error ("Process %s does not exist", SDATA (name));
    }
  else if (NILP (name))
    obj = Fcurrent_buffer ();
  else
    obj = name;

  /* Now obj should be either a buffer object or a process object.
   */
  if (BUFFERP (obj))
    {
      proc = Fget_buffer_process (obj);
      if (NILP (proc))
	error ("Buffer %s has no process", SDATA (XBUFFER (obj)->name));
    }
  else
    {
      CHECK_PROCESS (obj);
      proc = obj;
    }
  return proc;
}

DEFUN ("delete-process", Fdelete_process, Sdelete_process, 1, 1, 0,
       doc: /* Delete PROCESS: kill it and forget about it immediately.
PROCESS may be a process, a buffer, the name of a process or buffer, or
nil, indicating the current buffer's process.  */)
     (process)
     register Lisp_Object process;
{
  process = get_process (process);
  XPROCESS (process)->raw_status_low = Qnil;
  XPROCESS (process)->raw_status_high = Qnil;
  if (NETCONN_P (process))
    {
      XPROCESS (process)->status = Fcons (Qexit, Fcons (make_number (0), Qnil));
      XSETINT (XPROCESS (process)->tick, ++process_tick);
    }
  else if (XINT (XPROCESS (process)->infd) >= 0)
    {
      Fkill_process (process, Qnil);
      /* Do this now, since remove_process will make sigchld_handler do nothing.  */
      XPROCESS (process)->status
	= Fcons (Qsignal, Fcons (make_number (SIGKILL), Qnil));
      XSETINT (XPROCESS (process)->tick, ++process_tick);
      status_notify ();
    }
  remove_process (process);
  return Qnil;
}

DEFUN ("process-status", Fprocess_status, Sprocess_status, 1, 1, 0,
       doc: /* Return the status of PROCESS.
The returned value is one of the following symbols:
run  -- for a process that is running.
stop -- for a process stopped but continuable.
exit -- for a process that has exited.
signal -- for a process that has got a fatal signal.
open -- for a network stream connection that is open.
listen -- for a network stream server that is listening.
closed -- for a network stream connection that is closed.
connect -- when waiting for a non-blocking connection to complete.
failed -- when a non-blocking connection has failed.
nil -- if arg is a process name and no such process exists.
PROCESS may be a process, a buffer, the name of a process, or
nil, indicating the current buffer's process.  */)
     (process)
     register Lisp_Object process;
{
  register struct Lisp_Process *p;
  register Lisp_Object status;

  if (STRINGP (process))
    process = Fget_process (process);
  else
    process = get_process (process);

  if (NILP (process))
    return process;

  p = XPROCESS (process);
  if (!NILP (p->raw_status_low))
    update_status (p);
  status = p->status;
  if (CONSP (status))
    status = XCAR (status);
  if (NETCONN1_P (p))
    {
      if (EQ (status, Qexit))
	status = Qclosed;
      else if (EQ (p->command, Qt))
	status = Qstop;
      else if (EQ (status, Qrun))
	status = Qopen;
    }
  return status;
}

DEFUN ("process-exit-status", Fprocess_exit_status, Sprocess_exit_status,
       1, 1, 0,
       doc: /* Return the exit status of PROCESS or the signal number that killed it.
If PROCESS has not yet exited or died, return 0.  */)
     (process)
     register Lisp_Object process;
{
  CHECK_PROCESS (process);
  if (!NILP (XPROCESS (process)->raw_status_low))
    update_status (XPROCESS (process));
  if (CONSP (XPROCESS (process)->status))
    return XCAR (XCDR (XPROCESS (process)->status));
  return make_number (0);
}

DEFUN ("process-id", Fprocess_id, Sprocess_id, 1, 1, 0,
       doc: /* Return the process id of PROCESS.
This is the pid of the Unix process which PROCESS uses or talks to.
For a network connection, this value is nil.  */)
     (process)
     register Lisp_Object process;
{
  CHECK_PROCESS (process);
  return XPROCESS (process)->pid;
}

DEFUN ("process-name", Fprocess_name, Sprocess_name, 1, 1, 0,
       doc: /* Return the name of PROCESS, as a string.
This is the name of the program invoked in PROCESS,
possibly modified to make it unique among process names.  */)
     (process)
     register Lisp_Object process;
{
  CHECK_PROCESS (process);
  return XPROCESS (process)->name;
}

DEFUN ("process-command", Fprocess_command, Sprocess_command, 1, 1, 0,
       doc: /* Return the command that was executed to start PROCESS.
This is a list of strings, the first string being the program executed
and the rest of the strings being the arguments given to it.
For a non-child channel, this is nil.  */)
     (process)
     register Lisp_Object process;
{
  CHECK_PROCESS (process);
  return XPROCESS (process)->command;
}

DEFUN ("process-tty-name", Fprocess_tty_name, Sprocess_tty_name, 1, 1, 0,
       doc: /* Return the name of the terminal PROCESS uses, or nil if none.
This is the terminal that the process itself reads and writes on,
not the name of the pty that Emacs uses to talk with that terminal.  */)
     (process)
     register Lisp_Object process;
{
  CHECK_PROCESS (process);
  return XPROCESS (process)->tty_name;
}

DEFUN ("set-process-buffer", Fset_process_buffer, Sset_process_buffer,
       2, 2, 0,
       doc: /* Set buffer associated with PROCESS to BUFFER (a buffer, or nil).  */)
     (process, buffer)
     register Lisp_Object process, buffer;
{
  struct Lisp_Process *p;

  CHECK_PROCESS (process);
  if (!NILP (buffer))
    CHECK_BUFFER (buffer);
  p = XPROCESS (process);
  p->buffer = buffer;
  if (NETCONN1_P (p))
    p->childp = Fplist_put (p->childp, QCbuffer, buffer);
  setup_process_coding_systems (process);
  return buffer;
}

DEFUN ("process-buffer", Fprocess_buffer, Sprocess_buffer,
       1, 1, 0,
       doc: /* Return the buffer PROCESS is associated with.
Output from PROCESS is inserted in this buffer unless PROCESS has a filter.  */)
     (process)
     register Lisp_Object process;
{
  CHECK_PROCESS (process);
  return XPROCESS (process)->buffer;
}

DEFUN ("process-mark", Fprocess_mark, Sprocess_mark,
       1, 1, 0,
       doc: /* Return the marker for the end of the last output from PROCESS.  */)
     (process)
     register Lisp_Object process;
{
  CHECK_PROCESS (process);
  return XPROCESS (process)->mark;
}

DEFUN ("set-process-filter", Fset_process_filter, Sset_process_filter,
       2, 2, 0,
       doc: /* Give PROCESS the filter function FILTER; nil means no filter.
t means stop accepting output from the process.

When a process has a filter, its buffer is not used for output.
Instead, each time it does output, the entire string of output is
passed to the filter.

The filter gets two arguments: the process and the string of output.
The string argument is normally a multibyte string, except:
- if the process' input coding system is no-conversion or raw-text,
  it is a unibyte string (the non-converted input), or else
- if `default-enable-multibyte-characters' is nil, it is a unibyte
  string (the result of converting the decoded input multibyte
  string to unibyte with `string-make-unibyte').  */)
     (process, filter)
     register Lisp_Object process, filter;
{
  struct Lisp_Process *p;

  CHECK_PROCESS (process);
  p = XPROCESS (process);

  /* Don't signal an error if the process' input file descriptor
     is closed.  This could make debugging Lisp more difficult,
     for example when doing something like

     (setq process (start-process ...))
     (debug)
     (set-process-filter process ...)  */

  if (XINT (p->infd) >= 0)
    {
      if (EQ (filter, Qt) && !EQ (p->status, Qlisten))
	{
	  FD_CLR (XINT (p->infd), &input_wait_mask);
	  FD_CLR (XINT (p->infd), &non_keyboard_wait_mask);
	}
      else if (EQ (p->filter, Qt)
	       && !EQ (p->command, Qt)) /* Network process not stopped. */
	{
	  FD_SET (XINT (p->infd), &input_wait_mask);
	  FD_SET (XINT (p->infd), &non_keyboard_wait_mask);
	}
    }

  p->filter = filter;
  if (NETCONN1_P (p))
    p->childp = Fplist_put (p->childp, QCfilter, filter);
  setup_process_coding_systems (process);
  return filter;
}

DEFUN ("process-filter", Fprocess_filter, Sprocess_filter,
       1, 1, 0,
       doc: /* Returns the filter function of PROCESS; nil if none.
See `set-process-filter' for more info on filter functions.  */)
     (process)
     register Lisp_Object process;
{
  CHECK_PROCESS (process);
  return XPROCESS (process)->filter;
}

DEFUN ("set-process-sentinel", Fset_process_sentinel, Sset_process_sentinel,
       2, 2, 0,
       doc: /* Give PROCESS the sentinel SENTINEL; nil for none.
The sentinel is called as a function when the process changes state.
It gets two arguments: the process, and a string describing the change.  */)
     (process, sentinel)
     register Lisp_Object process, sentinel;
{
  CHECK_PROCESS (process);
  XPROCESS (process)->sentinel = sentinel;
  return sentinel;
}

DEFUN ("process-sentinel", Fprocess_sentinel, Sprocess_sentinel,
       1, 1, 0,
       doc: /* Return the sentinel of PROCESS; nil if none.
See `set-process-sentinel' for more info on sentinels.  */)
     (process)
     register Lisp_Object process;
{
  CHECK_PROCESS (process);
  return XPROCESS (process)->sentinel;
}

DEFUN ("set-process-window-size", Fset_process_window_size,
       Sset_process_window_size, 3, 3, 0,
       doc: /* Tell PROCESS that it has logical window size HEIGHT and WIDTH.  */)
     (process, height, width)
     register Lisp_Object process, height, width;
{
  CHECK_PROCESS (process);
  CHECK_NATNUM (height);
  CHECK_NATNUM (width);

  if (XINT (XPROCESS (process)->infd) < 0
      || set_window_size (XINT (XPROCESS (process)->infd),
			  XINT (height), XINT (width)) <= 0)
    return Qnil;
  else
    return Qt;
}

DEFUN ("set-process-inherit-coding-system-flag",
       Fset_process_inherit_coding_system_flag,
       Sset_process_inherit_coding_system_flag, 2, 2, 0,
       doc: /* Determine whether buffer of PROCESS will inherit coding-system.
If the second argument FLAG is non-nil, then the variable
`buffer-file-coding-system' of the buffer associated with PROCESS
will be bound to the value of the coding system used to decode
the process output.

This is useful when the coding system specified for the process buffer
leaves either the character code conversion or the end-of-line conversion
unspecified, or if the coding system used to decode the process output
is more appropriate for saving the process buffer.

Binding the variable `inherit-process-coding-system' to non-nil before
starting the process is an alternative way of setting the inherit flag
for the process which will run.  */)
     (process, flag)
     register Lisp_Object process, flag;
{
  CHECK_PROCESS (process);
  XPROCESS (process)->inherit_coding_system_flag = flag;
  return flag;
}

DEFUN ("process-inherit-coding-system-flag",
       Fprocess_inherit_coding_system_flag, Sprocess_inherit_coding_system_flag,
       1, 1, 0,
       doc: /* Return the value of inherit-coding-system flag for PROCESS.
If this flag is t, `buffer-file-coding-system' of the buffer
associated with PROCESS will inherit the coding system used to decode
the process output.  */)
     (process)
     register Lisp_Object process;
{
  CHECK_PROCESS (process);
  return XPROCESS (process)->inherit_coding_system_flag;
}

DEFUN ("set-process-query-on-exit-flag",
       Fset_process_query_on_exit_flag, Sset_process_query_on_exit_flag,
       2, 2, 0,
       doc: /* Specify if query is needed for PROCESS when Emacs is exited.
If the second argument FLAG is non-nil, emacs will query the user before
exiting if PROCESS is running.  */)
     (process, flag)
     register Lisp_Object process, flag;
{
  CHECK_PROCESS (process);
  XPROCESS (process)->kill_without_query = Fnull (flag);
  return flag;
}

DEFUN ("process-query-on-exit-flag",
       Fprocess_query_on_exit_flag, Sprocess_query_on_exit_flag,
       1, 1, 0,
       doc: /* Return the current value of query on exit flag for PROCESS.  */)
     (process)
     register Lisp_Object process;
{
  CHECK_PROCESS (process);
  return Fnull (XPROCESS (process)->kill_without_query);
}

#ifdef DATAGRAM_SOCKETS
Lisp_Object Fprocess_datagram_address ();
#endif

DEFUN ("process-contact", Fprocess_contact, Sprocess_contact,
       1, 2, 0,
       doc: /* Return the contact info of PROCESS; t for a real child.
For a net connection, the value depends on the optional KEY arg.
If KEY is nil, value is a cons cell of the form (HOST SERVICE),
if KEY is t, the complete contact information for the connection is
returned, else the specific value for the keyword KEY is returned.
See `make-network-process' for a list of keywords.  */)
     (process, key)
     register Lisp_Object process, key;
{
  Lisp_Object contact;

  CHECK_PROCESS (process);
  contact = XPROCESS (process)->childp;

#ifdef DATAGRAM_SOCKETS
  if (DATAGRAM_CONN_P (process)
      && (EQ (key, Qt) || EQ (key, QCremote)))
    contact = Fplist_put (contact, QCremote,
			  Fprocess_datagram_address (process));
#endif

  if (!NETCONN_P (process) || EQ (key, Qt))
    return contact;
  if (NILP (key))
    return Fcons (Fplist_get (contact, QChost),
		  Fcons (Fplist_get (contact, QCservice), Qnil));
  return Fplist_get (contact, key);
}

DEFUN ("process-plist", Fprocess_plist, Sprocess_plist,
       1, 1, 0,
       doc: /* Return the plist of PROCESS.  */)
     (process)
     register Lisp_Object process;
{
  CHECK_PROCESS (process);
  return XPROCESS (process)->plist;
}

DEFUN ("set-process-plist", Fset_process_plist, Sset_process_plist,
       2, 2, 0,
       doc: /* Replace the plist of PROCESS with PLIST.  Returns PLIST.  */)
     (process, plist)
     register Lisp_Object process, plist;
{
  CHECK_PROCESS (process);
  CHECK_LIST (plist);

  XPROCESS (process)->plist = plist;
  return plist;
}

#if 0 /* Turned off because we don't currently record this info
	 in the process.  Perhaps add it.  */
DEFUN ("process-connection", Fprocess_connection, Sprocess_connection, 1, 1, 0,
       doc: /* Return the connection type of PROCESS.
The value is nil for a pipe, t or `pty' for a pty, or `stream' for
a socket connection.  */)
     (process)
     Lisp_Object process;
{
  return XPROCESS (process)->type;
}
#endif

#ifdef HAVE_SOCKETS
DEFUN ("format-network-address", Fformat_network_address, Sformat_network_address,
       1, 2, 0,
       doc: /* Convert network ADDRESS from internal format to a string.
If optional second argument OMIT-PORT is non-nil, don't include a port
number in the string; in this case, interpret a 4 element vector as an
IP address.  Returns nil if format of ADDRESS is invalid.  */)
     (address, omit_port)
     Lisp_Object address, omit_port;
{
  if (NILP (address))
    return Qnil;

  if (STRINGP (address))  /* AF_LOCAL */
    return address;

  if (VECTORP (address))  /* AF_INET */
    {
      register struct Lisp_Vector *p = XVECTOR (address);
      Lisp_Object args[6];
      int nargs, i;

      if (!NILP (omit_port) && (p->size == 4 || p->size == 5))
	{
	  args[0] = build_string ("%d.%d.%d.%d");
	  nargs = 4;
	}
      else if (p->size == 5)
	{
	  args[0] = build_string ("%d.%d.%d.%d:%d");
	  nargs = 5;
	}
      else
	return Qnil;

      for (i = 0; i < nargs; i++)
	args[i+1] = p->contents[i];
      return Fformat (nargs+1, args);
    }

  if (CONSP (address))
    {
      Lisp_Object args[2];
      args[0] = build_string ("<Family %d>");
      args[1] = Fcar (address);
      return Fformat (2, args);

    }

  return Qnil;
}
#endif

Lisp_Object
list_processes_1 (query_only)
     Lisp_Object query_only;
{
  register Lisp_Object tail, tem;
  Lisp_Object proc, minspace, tem1;
  register struct Lisp_Process *p;
  char tembuf[300];
  int w_proc, w_buffer, w_tty;
  Lisp_Object i_status, i_buffer, i_tty, i_command;

  w_proc = 4;    /* Proc   */
  w_buffer = 6;  /* Buffer */
  w_tty = 0;     /* Omit if no ttys */

  for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail))
    {
      int i;

      proc = Fcdr (Fcar (tail));
      p = XPROCESS (proc);
      if (NILP (p->childp))
	continue;
      if (!NILP (query_only) && !NILP (p->kill_without_query))
	continue;
      if (STRINGP (p->name)
	  && ( i = SCHARS (p->name), (i > w_proc)))
	w_proc = i;
      if (!NILP (p->buffer))
	{
	  if (NILP (XBUFFER (p->buffer)->name) && w_buffer < 8)
	    w_buffer = 8;  /* (Killed) */
	  else if ((i = SCHARS (XBUFFER (p->buffer)->name), (i > w_buffer)))
	    w_buffer = i;
	}
      if (STRINGP (p->tty_name)
	  && (i = SCHARS (p->tty_name), (i > w_tty)))
	w_tty = i;
    }

  XSETFASTINT (i_status, w_proc + 1);
  XSETFASTINT (i_buffer, XFASTINT (i_status) + 9);
  if (w_tty)
    {
      XSETFASTINT (i_tty, XFASTINT (i_buffer) + w_buffer + 1);
      XSETFASTINT (i_command, XFASTINT (i_buffer) + w_tty + 1);
    } else {
      i_tty = Qnil;
      XSETFASTINT (i_command, XFASTINT (i_buffer) + w_buffer + 1);
    }

  XSETFASTINT (minspace, 1);

  set_buffer_internal (XBUFFER (Vstandard_output));
  Fbuffer_disable_undo (Vstandard_output);

  current_buffer->truncate_lines = Qt;

  write_string ("Proc", -1);
  Findent_to (i_status, minspace); write_string ("Status", -1);
  Findent_to (i_buffer, minspace); write_string ("Buffer", -1);
  if (!NILP (i_tty))
    {
      Findent_to (i_tty, minspace); write_string ("Tty", -1);
    }
  Findent_to (i_command, minspace); write_string ("Command", -1);
  write_string ("\n", -1);

  write_string ("----", -1);
  Findent_to (i_status, minspace); write_string ("------", -1);
  Findent_to (i_buffer, minspace); write_string ("------", -1);
  if (!NILP (i_tty))
    {
      Findent_to (i_tty, minspace); write_string ("---", -1);
    }
  Findent_to (i_command, minspace); write_string ("-------", -1);
  write_string ("\n", -1);

  for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail))
    {
      Lisp_Object symbol;

      proc = Fcdr (Fcar (tail));
      p = XPROCESS (proc);
      if (NILP (p->childp))
	continue;
      if (!NILP (query_only) && !NILP (p->kill_without_query))
	continue;

      Finsert (1, &p->name);
      Findent_to (i_status, minspace);

      if (!NILP (p->raw_status_low))
	update_status (p);
      symbol = p->status;
      if (CONSP (p->status))
	symbol = XCAR (p->status);


      if (EQ (symbol, Qsignal))
	{
	  Lisp_Object tem;
	  tem = Fcar (Fcdr (p->status));
#ifdef VMS
	  if (XINT (tem) < NSIG)
	    write_string (sys_errlist [XINT (tem)], -1);
	  else
#endif
	    Fprinc (symbol, Qnil);
	}
      else if (NETCONN1_P (p))
	{
	  if (EQ (symbol, Qexit))
	    write_string ("closed", -1);
	  else if (EQ (p->command, Qt))
	    write_string ("stopped", -1);
	  else if (EQ (symbol, Qrun))
	    write_string ("open", -1);
	  else
	    Fprinc (symbol, Qnil);
	}
      else
	Fprinc (symbol, Qnil);

      if (EQ (symbol, Qexit))
	{
	  Lisp_Object tem;
	  tem = Fcar (Fcdr (p->status));
	  if (XFASTINT (tem))
	    {
	      sprintf (tembuf, " %d", (int) XFASTINT (tem));
	      write_string (tembuf, -1);
	    }
	}

      if (EQ (symbol, Qsignal) || EQ (symbol, Qexit))
	remove_process (proc);

      Findent_to (i_buffer, minspace);
      if (NILP (p->buffer))
	insert_string ("(none)");
      else if (NILP (XBUFFER (p->buffer)->name))
	insert_string ("(Killed)");
      else
	Finsert (1, &XBUFFER (p->buffer)->name);

      if (!NILP (i_tty))
	{
	  Findent_to (i_tty, minspace);
	  if (STRINGP (p->tty_name))
	    Finsert (1, &p->tty_name);
	}

      Findent_to (i_command, minspace);

      if (EQ (p->status, Qlisten))
	{
	  Lisp_Object port = Fplist_get (p->childp, QCservice);
	  if (INTEGERP (port))
	    port = Fnumber_to_string (port);
	  if (NILP (port))
	    port = Fformat_network_address (Fplist_get (p->childp, QClocal), Qnil);
	  sprintf (tembuf, "(network %s server on %s)\n",
		   (DATAGRAM_CHAN_P (XINT (p->infd)) ? "datagram" : "stream"),
		   (STRINGP (port) ? (char *)SDATA (port) : "?"));
	  insert_string (tembuf);
	}
      else if (NETCONN1_P (p))
        {
	  /* For a local socket, there is no host name,
	     so display service instead.  */
	  Lisp_Object host = Fplist_get (p->childp, QChost);
	  if (!STRINGP (host))
	    {
	      host = Fplist_get (p->childp, QCservice);
	      if (INTEGERP (host))
		host = Fnumber_to_string (host);
	    }
	  if (NILP (host))
	    host = Fformat_network_address (Fplist_get (p->childp, QCremote), Qnil);
	  sprintf (tembuf, "(network %s connection to %s)\n",
		   (DATAGRAM_CHAN_P (XINT (p->infd)) ? "datagram" : "stream"),
		   (STRINGP (host) ? (char *)SDATA (host) : "?"));
	  insert_string (tembuf);
        }
      else
	{
	  tem = p->command;
	  while (1)
	    {
	      tem1 = Fcar (tem);
	      Finsert (1, &tem1);
	      tem = Fcdr (tem);
	      if (NILP (tem))
		break;
	      insert_string (" ");
	    }
	  insert_string ("\n");
       }
    }
  return Qnil;
}

DEFUN ("list-processes", Flist_processes, Slist_processes, 0, 1, "P",
       doc: /* Display a list of all processes.
If optional argument QUERY-ONLY is non-nil, only processes with
the query-on-exit flag set will be listed.
Any process listed as exited or signaled is actually eliminated
after the listing is made.  */)
     (query_only)
     Lisp_Object query_only;
{
  internal_with_output_to_temp_buffer ("*Process List*",
				       list_processes_1, query_only);
  return Qnil;
}

DEFUN ("process-list", Fprocess_list, Sprocess_list, 0, 0, 0,
       doc: /* Return a list of all processes.  */)
     ()
{
  return Fmapcar (Qcdr, Vprocess_alist);
}

/* Starting asynchronous inferior processes.  */

static Lisp_Object start_process_unwind ();

DEFUN ("start-process", Fstart_process, Sstart_process, 3, MANY, 0,
       doc: /* Start a program in a subprocess.  Return the process object for it.
NAME is name for process.  It is modified if necessary to make it unique.
BUFFER is the buffer or (buffer-name) to associate with the process.
 Process output goes at end of that buffer, unless you specify
 an output stream or filter function to handle the output.
 BUFFER may be also nil, meaning that this process is not associated
 with any buffer.
Third arg is program file name.  It is searched for in PATH.
Remaining arguments are strings to give program as arguments.

usage: (start-process NAME BUFFER PROGRAM &rest PROGRAM-ARGS)  */)
     (nargs, args)
     int nargs;
     register Lisp_Object *args;
{
  Lisp_Object buffer, name, program, proc, current_dir, tem;
#ifdef VMS
  register unsigned char *new_argv;
  int len;
#else
  register unsigned char **new_argv;
#endif
  register int i;
  int count = SPECPDL_INDEX ();

  buffer = args[1];
  if (!NILP (buffer))
    buffer = Fget_buffer_create (buffer);

  /* Make sure that the child will be able to chdir to the current
     buffer's current directory, or its unhandled equivalent.  We
     can't just have the child check for an error when it does the
     chdir, since it's in a vfork.

     We have to GCPRO around this because Fexpand_file_name and
     Funhandled_file_name_directory might call a file name handling
     function.  The argument list is protected by the caller, so all
     we really have to worry about is buffer.  */
  {
    struct gcpro gcpro1, gcpro2;

    current_dir = current_buffer->directory;

    GCPRO2 (buffer, current_dir);

    current_dir
      = expand_and_dir_to_file (Funhandled_file_name_directory (current_dir),
				Qnil);
    if (NILP (Ffile_accessible_directory_p (current_dir)))
      report_file_error ("Setting current directory",
			 Fcons (current_buffer->directory, Qnil));

    UNGCPRO;
  }

  name = args[0];
  CHECK_STRING (name);

  program = args[2];

  CHECK_STRING (program);

  proc = make_process (name);
  /* If an error occurs and we can't start the process, we want to
     remove it from the process list.  This means that each error
     check in create_process doesn't need to call remove_process
     itself; it's all taken care of here.  */
  record_unwind_protect (start_process_unwind, proc);

  XPROCESS (proc)->childp = Qt;
  XPROCESS (proc)->plist = Qnil;
  XPROCESS (proc)->command_channel_p = Qnil;
  XPROCESS (proc)->buffer = buffer;
  XPROCESS (proc)->sentinel = Qnil;
  XPROCESS (proc)->filter = Qnil;
  XPROCESS (proc)->filter_multibyte
    = buffer_defaults.enable_multibyte_characters;
  XPROCESS (proc)->command = Flist (nargs - 2, args + 2);

  /* Make the process marker point into the process buffer (if any).  */
  if (!NILP (buffer))
    set_marker_both (XPROCESS (proc)->mark, buffer,
		     BUF_ZV (XBUFFER (buffer)),
		     BUF_ZV_BYTE (XBUFFER (buffer)));

  {
    /* Decide coding systems for communicating with the process.  Here
       we don't setup the structure coding_system nor pay attention to
       unibyte mode.  They are done in create_process.  */

    /* Qt denotes we have not yet called Ffind_operation_coding_system.  */
    Lisp_Object coding_systems = Qt;
    Lisp_Object val, *args2;
    struct gcpro gcpro1, gcpro2;

    val = Vcoding_system_for_read;
    if (NILP (val))
      {
	args2 = (Lisp_Object *) alloca ((nargs + 1) * sizeof *args2);
	args2[0] = Qstart_process;
	for (i = 0; i < nargs; i++) args2[i + 1] = args[i];
	GCPRO2 (proc, current_dir);
	coding_systems = Ffind_operation_coding_system (nargs + 1, args2);
	UNGCPRO;
	if (CONSP (coding_systems))
	  val = XCAR (coding_systems);
	else if (CONSP (Vdefault_process_coding_system))
	  val = XCAR (Vdefault_process_coding_system);
      }
    XPROCESS (proc)->decode_coding_system = val;

    val = Vcoding_system_for_write;
    if (NILP (val))
      {
	if (EQ (coding_systems, Qt))
	  {
	    args2 = (Lisp_Object *) alloca ((nargs + 1) * sizeof args2);
	    args2[0] = Qstart_process;
	    for (i = 0; i < nargs; i++) args2[i + 1] = args[i];
	    GCPRO2 (proc, current_dir);
	    coding_systems = Ffind_operation_coding_system (nargs + 1, args2);
	    UNGCPRO;
	  }
	if (CONSP (coding_systems))
	  val = XCDR (coding_systems);
	else if (CONSP (Vdefault_process_coding_system))
	  val = XCDR (Vdefault_process_coding_system);
      }
    XPROCESS (proc)->encode_coding_system = val;
  }

#ifdef VMS
  /* Make a one member argv with all args concatenated
     together separated by a blank.  */
  len = SBYTES (program) + 2;
  for (i = 3; i < nargs; i++)
    {
      tem = args[i];
      CHECK_STRING (tem);
      len += SBYTES (tem) + 1;	/* count the blank */
    }
  new_argv = (unsigned char *) alloca (len);
  strcpy (new_argv, SDATA (program));
  for (i = 3; i < nargs; i++)
    {
      tem = args[i];
      CHECK_STRING (tem);
      strcat (new_argv, " ");
      strcat (new_argv, SDATA (tem));
    }
  /* Need to add code here to check for program existence on VMS */

#else /* not VMS */
  new_argv = (unsigned char **) alloca ((nargs - 1) * sizeof (char *));

  /* If program file name is not absolute, search our path for it.
     Put the name we will really use in TEM.  */
  if (!IS_DIRECTORY_SEP (SREF (program, 0))
      && !(SCHARS (program) > 1
	   && IS_DEVICE_SEP (SREF (program, 1))))
    {
      struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;

      tem = Qnil;
      GCPRO4 (name, program, buffer, current_dir);
      openp (Vexec_path, program, Vexec_suffixes, &tem, make_number (X_OK));
      UNGCPRO;
      if (NILP (tem))
	report_file_error ("Searching for program", Fcons (program, Qnil));
      tem = Fexpand_file_name (tem, Qnil);
    }
  else
    {
      if (!NILP (Ffile_directory_p (program)))
	error ("Specified program for new process is a directory");
      tem = program;
    }

  /* If program file name starts with /: for quoting a magic name,
     discard that.  */
  if (SBYTES (tem) > 2 && SREF (tem, 0) == '/'
      && SREF (tem, 1) == ':')
    tem = Fsubstring (tem, make_number (2), Qnil);

  /* Encode the file name and put it in NEW_ARGV.
     That's where the child will use it to execute the program.  */
  tem = ENCODE_FILE (tem);
  new_argv[0] = SDATA (tem);

  /* Here we encode arguments by the coding system used for sending
     data to the process.  We don't support using different coding
     systems for encoding arguments and for encoding data sent to the
     process.  */

  for (i = 3; i < nargs; i++)
    {
      tem = args[i];
      CHECK_STRING (tem);
      if (STRING_MULTIBYTE (tem))
	tem = (code_convert_string_norecord
	       (tem, XPROCESS (proc)->encode_coding_system, 1));
      new_argv[i - 2] = SDATA (tem);
    }
  new_argv[i - 2] = 0;
#endif /* not VMS */

  XPROCESS (proc)->decoding_buf = make_uninit_string (0);
  XPROCESS (proc)->decoding_carryover = make_number (0);
  XPROCESS (proc)->encoding_buf = make_uninit_string (0);
  XPROCESS (proc)->encoding_carryover = make_number (0);

  XPROCESS (proc)->inherit_coding_system_flag
    = (NILP (buffer) || !inherit_process_coding_system
       ? Qnil : Qt);

  create_process (proc, (char **) new_argv, current_dir);

  return unbind_to (count, proc);
}

/* This function is the unwind_protect form for Fstart_process.  If
   PROC doesn't have its pid set, then we know someone has signaled
   an error and the process wasn't started successfully, so we should
   remove it from the process list.  */
static Lisp_Object
start_process_unwind (proc)
     Lisp_Object proc;
{
  if (!PROCESSP (proc))
    abort ();

  /* Was PROC started successfully?  */
  if (XINT (XPROCESS (proc)->pid) <= 0)
    remove_process (proc);

  return Qnil;
}

void
create_process_1 (timer)
     struct atimer *timer;
{
  /* Nothing to do.  */
}


#if 0  /* This doesn't work; see the note before sigchld_handler.  */
#ifdef USG
#ifdef SIGCHLD
/* Mimic blocking of signals on system V, which doesn't really have it.  */

/* Nonzero means we got a SIGCHLD when it was supposed to be blocked.  */
int sigchld_deferred;

SIGTYPE
create_process_sigchld ()
{
  signal (SIGCHLD, create_process_sigchld);

  sigchld_deferred = 1;
}
#endif
#endif
#endif

#ifndef VMS /* VMS version of this function is in vmsproc.c.  */
void
create_process (process, new_argv, current_dir)
     Lisp_Object process;
     char **new_argv;
     Lisp_Object current_dir;
{
  int pid, inchannel, outchannel;
  int sv[2];
#ifdef POSIX_SIGNALS
  sigset_t procmask;
  sigset_t blocked;
  struct sigaction sigint_action;
  struct sigaction sigquit_action;
#ifdef AIX
  struct sigaction sighup_action;
#endif
#else /* !POSIX_SIGNALS */
#if 0
#ifdef SIGCHLD
  SIGTYPE (*sigchld)();
#endif
#endif /* 0 */
#endif /* !POSIX_SIGNALS */
  /* Use volatile to protect variables from being clobbered by longjmp.  */
  volatile int forkin, forkout;
  volatile int pty_flag = 0;
#ifndef USE_CRT_DLL
  extern char **environ;
#endif

  inchannel = outchannel = -1;

#ifdef HAVE_PTYS
  if (!NILP (Vprocess_connection_type))
    outchannel = inchannel = allocate_pty ();

  if (inchannel >= 0)
    {
#if ! defined (USG) || defined (USG_SUBTTY_WORKS)
      /* On most USG systems it does not work to open the pty's tty here,
	 then close it and reopen it in the child.  */
#ifdef O_NOCTTY
      /* Don't let this terminal become our controlling terminal
	 (in case we don't have one).  */
      forkout = forkin = emacs_open (pty_name, O_RDWR | O_NOCTTY, 0);
#else
      forkout = forkin = emacs_open (pty_name, O_RDWR, 0);
#endif
      if (forkin < 0)
	report_file_error ("Opening pty", Qnil);
#else
      forkin = forkout = -1;
#endif /* not USG, or USG_SUBTTY_WORKS */
      pty_flag = 1;
    }
  else
#endif /* HAVE_PTYS */
#ifdef SKTPAIR
    {
      if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv) < 0)
	report_file_error ("Opening socketpair", Qnil);
      outchannel = inchannel = sv[0];
      forkout = forkin = sv[1];
    }
#else /* not SKTPAIR */
    {
      int tem;
      tem = pipe (sv);
      if (tem < 0)
	report_file_error ("Creating pipe", Qnil);
      inchannel = sv[0];
      forkout = sv[1];
      tem = pipe (sv);
      if (tem < 0)
	{
	  emacs_close (inchannel);
	  emacs_close (forkout);
	  report_file_error ("Creating pipe", Qnil);
	}
      outchannel = sv[1];
      forkin = sv[0];
    }
#endif /* not SKTPAIR */

#if 0
  /* Replaced by close_process_descs */
  set_exclusive_use (inchannel);
  set_exclusive_use (outchannel);
#endif

/* Stride people say it's a mystery why this is needed
   as well as the O_NDELAY, but that it fails without this.  */
#if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS))
  {
    int one = 1;
    ioctl (inchannel, FIONBIO, &one);
  }
#endif

#ifdef O_NONBLOCK
  fcntl (inchannel, F_SETFL, O_NONBLOCK);
  fcntl (outchannel, F_SETFL, O_NONBLOCK);
#else
#ifdef O_NDELAY
  fcntl (inchannel, F_SETFL, O_NDELAY);
  fcntl (outchannel, F_SETFL, O_NDELAY);
#endif
#endif

  /* Record this as an active process, with its channels.
     As a result, child_setup will close Emacs's side of the pipes.  */
  chan_process[inchannel] = process;
  XSETINT (XPROCESS (process)->infd, inchannel);
  XSETINT (XPROCESS (process)->outfd, outchannel);

  /* Previously we recorded the tty descriptor used in the subprocess.
     It was only used for getting the foreground tty process, so now
     we just reopen the device (see emacs_get_tty_pgrp) as this is
     more portable (see USG_SUBTTY_WORKS above).  */

  XPROCESS (process)->pty_flag = (pty_flag ? Qt : Qnil);
  XPROCESS (process)->status = Qrun;
  setup_process_coding_systems (process);

  /* Delay interrupts until we have a chance to store
     the new fork's pid in its process structure */
#ifdef POSIX_SIGNALS
  sigemptyset (&blocked);
#ifdef SIGCHLD
  sigaddset (&blocked, SIGCHLD);
#endif
#ifdef HAVE_WORKING_VFORK
  /* On many hosts (e.g. Solaris 2.4), if a vforked child calls `signal',
     this sets the parent's signal handlers as well as the child's.
     So delay all interrupts whose handlers the child might munge,
     and record the current handlers so they can be restored later.  */
  sigaddset (&blocked, SIGINT );  sigaction (SIGINT , 0, &sigint_action );
  sigaddset (&blocked, SIGQUIT);  sigaction (SIGQUIT, 0, &sigquit_action);
#ifdef AIX
  sigaddset (&blocked, SIGHUP );  sigaction (SIGHUP , 0, &sighup_action );
#endif
#endif /* HAVE_WORKING_VFORK */
  sigprocmask (SIG_BLOCK, &blocked, &procmask);
#else /* !POSIX_SIGNALS */
#ifdef SIGCHLD
#ifdef BSD4_1
  sighold (SIGCHLD);
#else /* not BSD4_1 */
#if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
  sigsetmask (sigmask (SIGCHLD));
#else /* ordinary USG */
#if 0
  sigchld_deferred = 0;
  sigchld = signal (SIGCHLD, create_process_sigchld);
#endif
#endif /* ordinary USG */
#endif /* not BSD4_1 */
#endif /* SIGCHLD */
#endif /* !POSIX_SIGNALS */

  FD_SET (inchannel, &input_wait_mask);
  FD_SET (inchannel, &non_keyboard_wait_mask);
  if (inchannel > max_process_desc)
    max_process_desc = inchannel;

  /* Until we store the proper pid, enable sigchld_handler
     to recognize an unknown pid as standing for this process.
     It is very important not to let this `marker' value stay
     in the table after this function has returned; if it does
     it might cause call-process to hang and subsequent asynchronous
     processes to get their return values scrambled.  */
  XSETINT (XPROCESS (process)->pid, -1);

  BLOCK_INPUT;

  {
    /* child_setup must clobber environ on systems with true vfork.
       Protect it from permanent change.  */
    char **save_environ = environ;

    current_dir = ENCODE_FILE (current_dir);

#ifndef WINDOWSNT
    pid = vfork ();
    if (pid == 0)
#endif /* not WINDOWSNT */
      {
	int xforkin = forkin;
	int xforkout = forkout;

#if 0 /* This was probably a mistake--it duplicates code later on,
	 but fails to handle all the cases.  */
	/* Make sure SIGCHLD is not blocked in the child.  */
	sigsetmask (SIGEMPTYMASK);
#endif

	/* Make the pty be the controlling terminal of the process.  */
#ifdef HAVE_PTYS
	/* First, disconnect its current controlling terminal.  */
#ifdef HAVE_SETSID
	/* We tried doing setsid only if pty_flag, but it caused
	   process_set_signal to fail on SGI when using a pipe.  */
	setsid ();
	/* Make the pty's terminal the controlling terminal.  */
	if (pty_flag)
	  {
#ifdef TIOCSCTTY
	    /* We ignore the return value
	       because faith@cs.unc.edu says that is necessary on Linux.  */
	    ioctl (xforkin, TIOCSCTTY, 0);
#endif
	  }
#else /* not HAVE_SETSID */
#ifdef USG
	/* It's very important to call setpgrp here and no time
	   afterwards.  Otherwise, we lose our controlling tty which
	   is set when we open the pty. */
	setpgrp ();
#endif /* USG */
#endif /* not HAVE_SETSID */
#if defined (HAVE_TERMIOS) && defined (LDISC1)
	if (pty_flag && xforkin >= 0)
	  {
	    struct termios t;
	    tcgetattr (xforkin, &t);
	    t.c_lflag = LDISC1;
	    if (tcsetattr (xforkin, TCSANOW, &t) < 0)
	      emacs_write (1, "create_process/tcsetattr LDISC1 failed\n", 39);
	  }
#else
#if defined (NTTYDISC) && defined (TIOCSETD)
	if (pty_flag && xforkin >= 0)
	  {
	    /* Use new line discipline.  */
	    int ldisc = NTTYDISC;
	    ioctl (xforkin, TIOCSETD, &ldisc);
	  }
#endif
#endif
#ifdef TIOCNOTTY
	/* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you
	   can do TIOCSPGRP only to the process's controlling tty.  */
	if (pty_flag)
	  {
	    /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here?
	       I can't test it since I don't have 4.3.  */
	    int j = emacs_open ("/dev/tty", O_RDWR, 0);
	    ioctl (j, TIOCNOTTY, 0);
	    emacs_close (j);
#ifndef USG
	    /* In order to get a controlling terminal on some versions
	       of BSD, it is necessary to put the process in pgrp 0
	       before it opens the terminal.  */
#ifdef HAVE_SETPGID
	    setpgid (0, 0);
#else
	    setpgrp (0, 0);
#endif
#endif
	  }
#endif /* TIOCNOTTY */

#if !defined (RTU) && !defined (UNIPLUS) && !defined (DONT_REOPEN_PTY)
/*** There is a suggestion that this ought to be a
     conditional on TIOCSPGRP,
     or !(defined (HAVE_SETSID) && defined (TIOCSCTTY)).
     Trying the latter gave the wrong results on Debian GNU/Linux 1.1;
     that system does seem to need this code, even though
     both HAVE_SETSID and TIOCSCTTY are defined.  */
	/* Now close the pty (if we had it open) and reopen it.
	   This makes the pty the controlling terminal of the subprocess.  */
	if (pty_flag)
	  {
#ifdef SET_CHILD_PTY_PGRP
	    int pgrp = getpid ();
#endif

	    /* I wonder if emacs_close (emacs_open (pty_name, ...))
	       would work?  */
	    if (xforkin >= 0)
	      emacs_close (xforkin);
	    xforkout = xforkin = emacs_open (pty_name, O_RDWR, 0);

	    if (xforkin < 0)
	      {
		emacs_write (1, "Couldn't open the pty terminal ", 31);
		emacs_write (1, pty_name, strlen (pty_name));
		emacs_write (1, "\n", 1);
		_exit (1);
	      }

#ifdef SET_CHILD_PTY_PGRP
	    ioctl (xforkin, TIOCSPGRP, &pgrp);
	    ioctl (xforkout, TIOCSPGRP, &pgrp);
#endif
	  }
#endif /* not UNIPLUS and not RTU and not DONT_REOPEN_PTY */

#ifdef SETUP_SLAVE_PTY
	if (pty_flag)
	  {
	    SETUP_SLAVE_PTY;
	  }
#endif /* SETUP_SLAVE_PTY */
#ifdef AIX
	/* On AIX, we've disabled SIGHUP above once we start a child on a pty.
	   Now reenable it in the child, so it will die when we want it to.  */
	if (pty_flag)
	  signal (SIGHUP, SIG_DFL);
#endif
#endif /* HAVE_PTYS */

	signal (SIGINT, SIG_DFL);
	signal (SIGQUIT, SIG_DFL);

	/* Stop blocking signals in the child.  */
#ifdef POSIX_SIGNALS
	sigprocmask (SIG_SETMASK, &procmask, 0);
#else /* !POSIX_SIGNALS */
#ifdef SIGCHLD
#ifdef BSD4_1
	sigrelse (SIGCHLD);
#else /* not BSD4_1 */
#if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
	sigsetmask (SIGEMPTYMASK);
#else /* ordinary USG */
#if 0
	signal (SIGCHLD, sigchld);
#endif
#endif /* ordinary USG */
#endif /* not BSD4_1 */
#endif /* SIGCHLD */
#endif /* !POSIX_SIGNALS */

	if (pty_flag)
	  child_setup_tty (xforkout);
#ifdef WINDOWSNT
	pid = child_setup (xforkin, xforkout, xforkout,
			   new_argv, 1, current_dir);
#else  /* not WINDOWSNT */
	child_setup (xforkin, xforkout, xforkout,
		     new_argv, 1, current_dir);
#endif /* not WINDOWSNT */
      }
    environ = save_environ;
  }

  UNBLOCK_INPUT;

  /* This runs in the Emacs process.  */
  if (pid < 0)
    {
      if (forkin >= 0)
	emacs_close (forkin);
      if (forkin != forkout && forkout >= 0)
	emacs_close (forkout);
    }
  else
    {
      /* vfork succeeded.  */
      XSETFASTINT (XPROCESS (process)->pid, pid);

#ifdef WINDOWSNT
      register_child (pid, inchannel);
#endif /* WINDOWSNT */

      /* If the subfork execv fails, and it exits,
	 this close hangs.  I don't know why.
	 So have an interrupt jar it loose.  */
      {
	struct atimer *timer;
	EMACS_TIME offset;

	stop_polling ();
	EMACS_SET_SECS_USECS (offset, 1, 0);
	timer = start_atimer (ATIMER_RELATIVE, offset, create_process_1, 0);

	if (forkin >= 0)
	  emacs_close (forkin);

	cancel_atimer (timer);
	start_polling ();
      }

      if (forkin != forkout && forkout >= 0)
	emacs_close (forkout);

#ifdef HAVE_PTYS
      if (pty_flag)
	XPROCESS (process)->tty_name = build_string (pty_name);
      else
#endif
	XPROCESS (process)->tty_name = Qnil;
    }

  /* Restore the signal state whether vfork succeeded or not.
     (We will signal an error, below, if it failed.)  */
#ifdef POSIX_SIGNALS
#ifdef HAVE_WORKING_VFORK
  /* Restore the parent's signal handlers.  */
  sigaction (SIGINT, &sigint_action, 0);
  sigaction (SIGQUIT, &sigquit_action, 0);
#ifdef AIX
  sigaction (SIGHUP, &sighup_action, 0);
#endif
#endif /* HAVE_WORKING_VFORK */
  /* Stop blocking signals in the parent.  */
  sigprocmask (SIG_SETMASK, &procmask, 0);
#else /* !POSIX_SIGNALS */
#ifdef SIGCHLD
#ifdef BSD4_1
  sigrelse (SIGCHLD);
#else /* not BSD4_1 */
#if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
  sigsetmask (SIGEMPTYMASK);
#else /* ordinary USG */
#if 0
  signal (SIGCHLD, sigchld);
  /* Now really handle any of these signals
     that came in during this function.  */
  if (sigchld_deferred)
    kill (getpid (), SIGCHLD);
#endif
#endif /* ordinary USG */
#endif /* not BSD4_1 */
#endif /* SIGCHLD */
#endif /* !POSIX_SIGNALS */

  /* Now generate the error if vfork failed.  */
  if (pid < 0)
    report_file_error ("Doing vfork", Qnil);
}
#endif /* not VMS */


#ifdef HAVE_SOCKETS

/* Convert an internal struct sockaddr to a lisp object (vector or string).
   The address family of sa is not included in the result.  */

static Lisp_Object
conv_sockaddr_to_lisp (sa, len)
     struct sockaddr *sa;
     int len;
{
  Lisp_Object address;
  int i;
  unsigned char *cp;
  register struct Lisp_Vector *p;

  switch (sa->sa_family)
    {
    case AF_INET:
      {
	struct sockaddr_in *sin = (struct sockaddr_in *) sa;
	len = sizeof (sin->sin_addr) + 1;
	address = Fmake_vector (make_number (len), Qnil);
	p = XVECTOR (address);
	p->contents[--len] = make_number (ntohs (sin->sin_port));
	cp = (unsigned char *)&sin->sin_addr;
	break;
      }
#ifdef HAVE_LOCAL_SOCKETS
    case AF_LOCAL:
      {
	struct sockaddr_un *sockun = (struct sockaddr_un *) sa;
	for (i = 0; i < sizeof (sockun->sun_path); i++)
	  if (sockun->sun_path[i] == 0)
	    break;
	return make_unibyte_string (sockun->sun_path, i);
      }
#endif
    default:
      len -= sizeof (sa->sa_family);
      address = Fcons (make_number (sa->sa_family),
		       Fmake_vector (make_number (len), Qnil));
      p = XVECTOR (XCDR (address));
      cp = (unsigned char *) sa + sizeof (sa->sa_family);
      break;
    }

  i = 0;
  while (i < len)
    p->contents[i++] = make_number (*cp++);

  return address;
}


/* Get family and required size for sockaddr structure to hold ADDRESS.  */

static int
get_lisp_to_sockaddr_size (address, familyp)
     Lisp_Object address;
     int *familyp;
{
  register struct Lisp_Vector *p;

  if (VECTORP (address))
    {
      p = XVECTOR (address);
      if (p->size == 5)
	{
	  *familyp = AF_INET;
	  return sizeof (struct sockaddr_in);
	}
    }
#ifdef HAVE_LOCAL_SOCKETS
  else if (STRINGP (address))
    {
      *familyp = AF_LOCAL;
      return sizeof (struct sockaddr_un);
    }
#endif
  else if (CONSP (address) && INTEGERP (XCAR (address)) && VECTORP (XCDR (address)))
    {
      struct sockaddr *sa;
      *familyp = XINT (XCAR (address));
      p = XVECTOR (XCDR (address));
      return p->size + sizeof (sa->sa_family);
    }
  return 0;
}

/* Convert an address object (vector or string) to an internal sockaddr.
   Format of address has already been validated by size_lisp_to_sockaddr.  */

static void
conv_lisp_to_sockaddr (family, address, sa, len)
     int family;
     Lisp_Object address;
     struct sockaddr *sa;
     int len;
{
  register struct Lisp_Vector *p;
  register unsigned char *cp = NULL;
  register int i;

  bzero (sa, len);
  sa->sa_family = family;

  if (VECTORP (address))
    {
      p = XVECTOR (address);
      if (family == AF_INET)
	{
	  struct sockaddr_in *sin = (struct sockaddr_in *) sa;
	  len = sizeof (sin->sin_addr) + 1;
	  i = XINT (p->contents[--len]);
	  sin->sin_port = htons (i);
	  cp = (unsigned char *)&sin->sin_addr;
	}
    }
  else if (STRINGP (address))
    {
#ifdef HAVE_LOCAL_SOCKETS
      if (family == AF_LOCAL)
	{
	  struct sockaddr_un *sockun = (struct sockaddr_un *) sa;
	  cp = SDATA (address);
	  for (i = 0; i < sizeof (sockun->sun_path) && *cp; i++)
	    sockun->sun_path[i] = *cp++;
	}
#endif
      return;
    }
  else
    {
      p = XVECTOR (XCDR (address));
      cp = (unsigned char *)sa + sizeof (sa->sa_family);
    }

  for (i = 0; i < len; i++)
    if (INTEGERP (p->contents[i]))
      *cp++ = XFASTINT (p->contents[i]) & 0xff;
}

#ifdef DATAGRAM_SOCKETS
DEFUN ("process-datagram-address", Fprocess_datagram_address, Sprocess_datagram_address,
       1, 1, 0,
       doc: /* Get the current datagram address associated with PROCESS.  */)
       (process)
       Lisp_Object process;
{
  int channel;

  CHECK_PROCESS (process);

  if (!DATAGRAM_CONN_P (process))
    return Qnil;

  channel = XINT (XPROCESS (process)->infd);
  return conv_sockaddr_to_lisp (datagram_address[channel].sa,
				datagram_address[channel].len);
}

DEFUN ("set-process-datagram-address", Fset_process_datagram_address, Sset_process_datagram_address,
       2, 2, 0,
       doc: /* Set the datagram address for PROCESS to ADDRESS.
Returns nil upon error setting address, ADDRESS otherwise.  */)
       (process, address)
       Lisp_Object process, address;
{
  int channel;
  int family, len;

  CHECK_PROCESS (process);

  if (!DATAGRAM_CONN_P (process))
    return Qnil;

  channel = XINT (XPROCESS (process)->infd);

  len = get_lisp_to_sockaddr_size (address, &family);
  if (datagram_address[channel].len != len)
    return Qnil;
  conv_lisp_to_sockaddr (family, address, datagram_address[channel].sa, len);
  return address;
}
#endif


static struct socket_options {
  /* The name of this option.  Should be lowercase version of option
     name without SO_ prefix. */
  char *name;
  /* Length of name.  */
  int nlen;
  /* Option level SOL_... */
  int optlevel;
  /* Option number SO_... */
  int optnum;
  enum { SOPT_UNKNOWN, SOPT_BOOL, SOPT_INT, SOPT_STR, SOPT_LINGER } opttype;
} socket_options[] =
  {
#ifdef SO_BINDTODEVICE
    { "bindtodevice", 12, SOL_SOCKET, SO_BINDTODEVICE, SOPT_STR },
#endif
#ifdef SO_BROADCAST
    { "broadcast", 9, SOL_SOCKET, SO_BROADCAST, SOPT_BOOL },
#endif
#ifdef SO_DONTROUTE
    { "dontroute", 9, SOL_SOCKET, SO_DONTROUTE, SOPT_BOOL },
#endif
#ifdef SO_KEEPALIVE
    { "keepalive", 9, SOL_SOCKET, SO_KEEPALIVE, SOPT_BOOL },
#endif
#ifdef SO_LINGER
    { "linger", 6, SOL_SOCKET, SO_LINGER, SOPT_LINGER },
#endif
#ifdef SO_OOBINLINE
    { "oobinline", 9, SOL_SOCKET, SO_OOBINLINE, SOPT_BOOL },
#endif
#ifdef SO_PRIORITY
    { "priority", 8, SOL_SOCKET, SO_PRIORITY, SOPT_INT },
#endif
#ifdef SO_REUSEADDR
    { "reuseaddr", 9, SOL_SOCKET, SO_REUSEADDR, SOPT_BOOL },
#endif
    { 0, 0, 0, 0, SOPT_UNKNOWN }
  };

/* Process list of socket options OPTS on socket S.
   Only check if options are supported is S < 0.
   If NO_ERROR is non-zero, continue silently if an option
   cannot be set.

   Each element specifies one option.  An element is either a string
   "OPTION=VALUE" or a cons (OPTION . VALUE) where OPTION is a string
   or a symbol.  */

static int
set_socket_options (s, opts, no_error)
     int s;
     Lisp_Object opts;
     int no_error;
{
  if (!CONSP (opts))
    opts = Fcons (opts, Qnil);

  while (CONSP (opts))
    {
      Lisp_Object opt;
      Lisp_Object val;
      char *name, *arg;
      struct socket_options *sopt;
      int ret = 0;

      opt = XCAR (opts);
      opts = XCDR (opts);

      name = 0;
      val = Qt;
      if (CONSP (opt))
	{
	  val = XCDR (opt);
	  opt = XCAR (opt);
	}
      if (STRINGP (opt))
	name = (char *) SDATA (opt);
      else if (SYMBOLP (opt))
	name = (char *) SDATA (SYMBOL_NAME (opt));
      else {
	error ("Mal-formed option list");
	return 0;
      }

      if (strncmp (name, "no", 2) == 0)
	{
	  val = Qnil;
	  name += 2;
	}

      arg = 0;
      for (sopt = socket_options; sopt->name; sopt++)
	if (strncmp (name, sopt->name, sopt->nlen) == 0)
	  {
	    if (name[sopt->nlen] == 0)
	      break;
	    if (name[sopt->nlen] == '=')
	      {
		arg = name + sopt->nlen + 1;
		break;
	      }
	  }

      switch (sopt->opttype)
	{
	case SOPT_BOOL:
	  {
	    int optval;
	    if (s < 0)
	      return 1;
	    if (arg)
	      optval = (*arg == '0' || *arg == 'n') ? 0 : 1;
	    else if (INTEGERP (val))
	      optval = XINT (val) == 0 ? 0 : 1;
	    else
	      optval = NILP (val) ? 0 : 1;
	    ret = setsockopt (s, sopt->optlevel, sopt->optnum,
			      &optval, sizeof (optval));
	    break;
	  }

	case SOPT_INT:
	  {
	    int optval;
	    if (arg)
	      optval = atoi(arg);
	    else if (INTEGERP (val))
	      optval = XINT (val);
	    else
	      error ("Bad option argument for %s", name);
	    if (s < 0)
	      return 1;
	    ret = setsockopt (s, sopt->optlevel, sopt->optnum,
			      &optval, sizeof (optval));
	    break;
	  }

	case SOPT_STR:
	  {
	    if (!arg)
	      {
		if (NILP (val))
		  arg = "";
		else if (STRINGP (val))
		  arg = (char *) SDATA (val);
		else if (XSYMBOL (val))
		  arg = (char *) SDATA (SYMBOL_NAME (val));
		else
		  error ("Invalid argument to %s option", name);
	      }
	    ret = setsockopt (s, sopt->optlevel, sopt->optnum,
			      arg, strlen (arg));
	  }

#ifdef SO_LINGER
	case SOPT_LINGER:
	  {
	    struct linger linger;

	    linger.l_onoff = 1;
	    linger.l_linger = 0;

	    if (s < 0)
	      return 1;

	    if (arg)
	      {
		if (*arg == 'n' || *arg == 't' || *arg == 'y')
		  linger.l_onoff = (*arg == 'n') ? 0 : 1;
		else
		  linger.l_linger = atoi(arg);
	      }
	    else if (INTEGERP (val))
	      linger.l_linger = XINT (val);
	    else
	      linger.l_onoff = NILP (val) ? 0 : 1;
	    ret = setsockopt (s, sopt->optlevel, sopt->optnum,
			      &linger, sizeof (linger));
	    break;
	  }
#endif
	default:
	  if (s < 0)
	    return 0;
	  if (no_error)
	    continue;
	  error ("Unsupported option: %s", name);
	}
      if (ret < 0 && ! no_error)
	  report_file_error ("Cannot set network option: %s", opt);
    }
  return 1;
}

DEFUN ("set-network-process-options",
       Fset_network_process_options, Sset_network_process_options,
       1, MANY, 0,
       doc: /* Set one or more options for network process PROCESS.
Each option is either a string "OPT=VALUE" or a cons (OPT . VALUE).
A boolean value is false if it either zero or nil, true otherwise.

The following options are known.  Consult the relevant system manual
pages for more information.

bindtodevice=NAME -- bind to interface NAME, or remove binding if nil.
broadcast=BOOL -- Allow send and receive of datagram broadcasts.
dontroute=BOOL -- Only send to directly connected hosts.
keepalive=BOOL -- Send keep-alive messages on network stream.
linger=BOOL or TIMEOUT -- Send queued messages before closing.
oobinline=BOOL -- Place out-of-band data in receive data stream.
priority=INT -- Set protocol defined priority for sent packets.
reuseaddr=BOOL -- Allow reusing a recently used address.

usage: (set-network-process-options PROCESS &rest OPTIONS)  */)
     (nargs, args)
     int nargs;
     Lisp_Object *args;
{
  Lisp_Object process;
  Lisp_Object opts;

  process = args[0];
  CHECK_PROCESS (process);
  if (nargs > 1 && XINT (XPROCESS (process)->infd) >= 0)
    {
      opts = Flist (nargs, args);
      set_socket_options (XINT (XPROCESS (process)->infd), opts, 0);
    }
  return process;
}

/* A version of request_sigio suitable for a record_unwind_protect.  */

Lisp_Object
unwind_request_sigio (dummy)
     Lisp_Object dummy;
{
  if (interrupt_input)
    request_sigio ();
  return Qnil;
}

/* Create a network stream/datagram client/server process.  Treated
   exactly like a normal process when reading and writing.  Primary
   differences are in status display and process deletion.  A network
   connection has no PID; you cannot signal it.  All you can do is
   stop/continue it and deactivate/close it via delete-process */

DEFUN ("make-network-process", Fmake_network_process, Smake_network_process,
       0, MANY, 0,
       doc: /* Create and return a network server or client process.

In Emacs, network connections are represented by process objects, so
input and output work as for subprocesses and `delete-process' closes
a network connection.  However, a network process has no process id,
it cannot be signalled, and the status codes are different from normal
processes.

Arguments are specified as keyword/argument pairs.  The following
arguments are defined:

:name NAME -- NAME is name for process.  It is modified if necessary
to make it unique.

:buffer BUFFER -- BUFFER is the buffer (or buffer-name) to associate
with the process.  Process output goes at end of that buffer, unless
you specify an output stream or filter function to handle the output.
BUFFER may be also nil, meaning that this process is not associated
with any buffer.

:host HOST -- HOST is name of the host to connect to, or its IP
address.  The symbol `local' specifies the local host.  If specified
for a server process, it must be a valid name or address for the local
host, and only clients connecting to that address will be accepted.

:service SERVICE -- SERVICE is name of the service desired, or an
integer specifying a port number to connect to.  If SERVICE is t,
a random port number is selected for the server.

:type TYPE -- TYPE is the type of connection.  The default (nil) is a
stream type connection, `datagram' creates a datagram type connection.

:family FAMILY -- FAMILY is the address (and protocol) family for the
service specified by HOST and SERVICE.  The default address family is
Inet (or IPv4) for the host and port number specified by HOST and
SERVICE.  Other address families supported are:
  local -- for a local (i.e. UNIX) address specified by SERVICE.

:local ADDRESS -- ADDRESS is the local address used for the connection.
This parameter is ignored when opening a client process. When specified
for a server process, the FAMILY, HOST and SERVICE args are ignored.

:remote ADDRESS -- ADDRESS is the remote partner's address for the
connection.  This parameter is ignored when opening a stream server
process.  For a datagram server process, it specifies the initial
setting of the remote datagram address.  When specified for a client
process, the FAMILY, HOST, and SERVICE args are ignored.

The format of ADDRESS depends on the address family:
- An IPv4 address is represented as an vector of integers [A B C D P]
corresponding to numeric IP address A.B.C.D and port number P.
- A local address is represented as a string with the address in the
local address space.
- An "unsupported family" address is represented by a cons (F . AV)
where F is the family number and AV is a vector containing the socket
address data with one element per address data byte.  Do not rely on
this format in portable code, as it may depend on implementation
defined constants, data sizes, and data structure alignment.

:coding CODING -- CODING is coding system for this process.

:options OPTIONS -- Set the specified options for the network process.
See `set-network-process-options' for details.

:nowait BOOL -- If BOOL is non-nil for a stream type client process,
return without waiting for the connection to complete; instead, the
sentinel function will be called with second arg matching "open" (if
successful) or "failed" when the connect completes.  Default is to use
a blocking connect (i.e. wait) for stream type connections.

:noquery BOOL -- Query the user unless BOOL is non-nil, and process is
running when emacs is exited.

:stop BOOL -- Start process in the `stopped' state if BOOL non-nil.
In the stopped state, a server process does not accept new
connections, and a client process does not handle incoming traffic.
The stopped state is cleared by `continue-process' and set by
`stop-process'.

:filter FILTER -- Install FILTER as the process filter.

:filter-multibyte BOOL -- If BOOL is non-nil, strings given to the
process filter are multibyte, otherwise they are unibyte.
If this keyword is not specified, the strings are multibyte iff
`default-enable-multibyte-characters' is non-nil.

:sentinel SENTINEL -- Install SENTINEL as the process sentinel.

:log LOG -- Install LOG as the server process log function.  This
function is called when the server accepts a network connection from a
client.  The arguments are SERVER, CLIENT, and MESSAGE, where SERVER
is the server process, CLIENT is the new process for the connection,
and MESSAGE is a string.

:plist PLIST -- Install PLIST as the new process' initial plist.

:server BOOL -- if BOOL is non-nil, create a server process for the
specified FAMILY, SERVICE, and connection type (stream or datagram).
Default is a client process.

A server process will listen for and accept connections from
clients.  When a client connection is accepted, a new network process
is created for the connection with the following parameters:
- The client's process name is constructed by concatenating the server
process' NAME and a client identification string.
- If the FILTER argument is non-nil, the client process will not get a
separate process buffer; otherwise, the client's process buffer is a newly
created buffer named after the server process' BUFFER name or process
NAME concatenated with the client identification string.
- The connection type and the process filter and sentinel parameters are
inherited from the server process' TYPE, FILTER and SENTINEL.
- The client process' contact info is set according to the client's
addressing information (typically an IP address and a port number).
- The client process' plist is initialized from the server's plist.

Notice that the FILTER and SENTINEL args are never used directly by
the server process.  Also, the BUFFER argument is not used directly by
the server process, but via the optional :log function, accepted (and
failed) connections may be logged in the server process' buffer.

The original argument list, modified with the actual connection
information, is available via the `process-contact' function.

usage: (make-network-process &rest ARGS)  */)
     (nargs, args)
     int nargs;
     Lisp_Object *args;
{
  Lisp_Object proc;
  Lisp_Object contact;
  struct Lisp_Process *p;
#ifdef HAVE_GETADDRINFO
  struct addrinfo ai, *res, *lres;
      struct addrinfo hints;
      char *portstring, portbuf[128];
#else /* HAVE_GETADDRINFO */
  struct _emacs_addrinfo
  {
    int ai_family;
    int ai_socktype;
    int ai_protocol;
    int ai_addrlen;
    struct sockaddr *ai_addr;
    struct _emacs_addrinfo *ai_next;
  } ai, *res, *lres;
#endif /* HAVE_GETADDRINFO */
  struct sockaddr_in address_in;
#ifdef HAVE_LOCAL_SOCKETS
  struct sockaddr_un address_un;
#endif
  int port;
  int ret = 0;
  int xerrno = 0;
  int s = -1, outch, inch;
  struct gcpro gcpro1;
  int retry = 0;
  int count = SPECPDL_INDEX ();
  int count1;
  Lisp_Object QCaddress;  /* one of QClocal or QCremote */
  Lisp_Object tem;
  Lisp_Object name, buffer, host, service, address;
  Lisp_Object filter, sentinel;
  int is_non_blocking_client = 0;
  int is_server = 0;
  int socktype;
  int family = -1;

  if (nargs == 0)
    return Qnil;

  /* Save arguments for process-contact and clone-process.  */
  contact = Flist (nargs, args);
  GCPRO1 (contact);

#ifdef WINDOWSNT
  /* Ensure socket support is loaded if available. */
  init_winsock (TRUE);
#endif

  /* :type TYPE  (nil: stream, datagram */
  tem = Fplist_get (contact, QCtype);
  if (NILP (tem))
    socktype = SOCK_STREAM;
#ifdef DATAGRAM_SOCKETS
  else if (EQ (tem, Qdatagram))
    socktype = SOCK_DGRAM;
#endif
  else
    error ("Unsupported connection type");

  /* :server BOOL */
  tem = Fplist_get (contact, QCserver);
  if (!NILP (tem))
    {
      /* Don't support network sockets when non-blocking mode is
	 not available, since a blocked Emacs is not useful.  */
#if defined(TERM) || (!defined(O_NONBLOCK) && !defined(O_NDELAY))
      error ("Network servers not supported");
#else
      is_server = 1;
#endif
    }

  /* Make QCaddress an alias for :local (server) or :remote (client).  */
  QCaddress = is_server ? QClocal : QCremote;

  /* :wait BOOL */
  if (!is_server && socktype == SOCK_STREAM
      && (tem = Fplist_get (contact, QCnowait), !NILP (tem)))
    {
#ifndef NON_BLOCKING_CONNECT
      error ("Non-blocking connect not supported");
#else
      is_non_blocking_client = 1;
#endif
    }

  name = Fplist_get (contact, QCname);
  buffer = Fplist_get (contact, QCbuffer);
  filter = Fplist_get (contact, QCfilter);
  sentinel = Fplist_get (contact, QCsentinel);

  CHECK_STRING (name);

#ifdef TERM
  /* Let's handle TERM before things get complicated ...   */
  host = Fplist_get (contact, QChost);
  CHECK_STRING (host);

  service = Fplist_get (contact, QCservice);
  if (INTEGERP (service))
    port = htons ((unsigned short) XINT (service));
  else
    {
      struct servent *svc_info;
      CHECK_STRING (service);
      svc_info = getservbyname (SDATA (service), "tcp");
      if (svc_info == 0)
	error ("Unknown service: %s", SDATA (service));
      port = svc_info->s_port;
    }

  s = connect_server (0);
  if (s < 0)
    report_file_error ("error creating socket", Fcons (name, Qnil));
  send_command (s, C_PORT, 0, "%s:%d", SDATA (host), ntohs (port));
  send_command (s, C_DUMB, 1, 0);

#else  /* not TERM */

  /* Initialize addrinfo structure in case we don't use getaddrinfo.  */
  ai.ai_socktype = socktype;
  ai.ai_protocol = 0;
  ai.ai_next = NULL;
  res = &ai;

  /* :local ADDRESS or :remote ADDRESS */
  address = Fplist_get (contact, QCaddress);
  if (!NILP (address))
    {
      host = service = Qnil;

      if (!(ai.ai_addrlen = get_lisp_to_sockaddr_size (address, &family)))
	error ("Malformed :address");
      ai.ai_family = family;
      ai.ai_addr = alloca (ai.ai_addrlen);
      conv_lisp_to_sockaddr (family, address, ai.ai_addr, ai.ai_addrlen);
      goto open_socket;
    }

  /* :family FAMILY -- nil (for Inet), local, or integer.  */
  tem = Fplist_get (contact, QCfamily);
  if (INTEGERP (tem))
    family = XINT (tem);
  else
    {
      if (NILP (tem))
	family = AF_INET;
#ifdef HAVE_LOCAL_SOCKETS
      else if (EQ (tem, Qlocal))
	family = AF_LOCAL;
#endif
    }
  if (family < 0)
    error ("Unknown address family");
  ai.ai_family = family;

  /* :service SERVICE -- string, integer (port number), or t (random port).  */
  service = Fplist_get (contact, QCservice);

#ifdef HAVE_LOCAL_SOCKETS
  if (family == AF_LOCAL)
    {
      /* Host is not used.  */
      host = Qnil;
      CHECK_STRING (service);
      bzero (&address_un, sizeof address_un);
      address_un.sun_family = AF_LOCAL;
      strncpy (address_un.sun_path, SDATA (service), sizeof address_un.sun_path);
      ai.ai_addr = (struct sockaddr *) &address_un;
      ai.ai_addrlen = sizeof address_un;
      goto open_socket;
    }
#endif

  /* :host HOST -- hostname, ip address, or 'local for localhost.  */
  host = Fplist_get (contact, QChost);
  if (!NILP (host))
    {
      if (EQ (host, Qlocal))
	host = build_string ("localhost");
      CHECK_STRING (host);
    }

  /* Slow down polling to every ten seconds.
     Some kernels have a bug which causes retrying connect to fail
     after a connect.  Polling can interfere with gethostbyname too.  */
#ifdef POLL_FOR_INPUT
  if (socktype == SOCK_STREAM)
    {
      record_unwind_protect (unwind_stop_other_atimers, Qnil);
      bind_polling_period (10);
    }
#endif

#ifdef HAVE_GETADDRINFO
  /* If we have a host, use getaddrinfo to resolve both host and service.
     Otherwise, use getservbyname to lookup the service.  */
  if (!NILP (host))
    {

      /* SERVICE can either be a string or int.
	 Convert to a C string for later use by getaddrinfo.  */
      if (EQ (service, Qt))
	portstring = "0";
      else if (INTEGERP (service))
	{
	  sprintf (portbuf, "%ld", (long) XINT (service));
	  portstring = portbuf;
	}
      else
	{
	  CHECK_STRING (service);
	  portstring = SDATA (service);
	}

      immediate_quit = 1;
      QUIT;
      memset (&hints, 0, sizeof (hints));
      hints.ai_flags = 0;
      hints.ai_family = NILP (Fplist_member (contact, QCfamily)) ? AF_UNSPEC : family;
      hints.ai_socktype = socktype;
      hints.ai_protocol = 0;
      ret = getaddrinfo (SDATA (host), portstring, &hints, &res);
      if (ret)
#ifdef HAVE_GAI_STRERROR
	error ("%s/%s %s", SDATA (host), portstring, gai_strerror(ret));
#else
        error ("%s/%s getaddrinfo error %d", SDATA (host), portstring, ret);
#endif
      immediate_quit = 0;

      goto open_socket;
    }
#endif /* HAVE_GETADDRINFO */

  /* We end up here if getaddrinfo is not defined, or in case no hostname
     has been specified (e.g. for a local server process).  */

  if (EQ (service, Qt))
    port = 0;
  else if (INTEGERP (service))
    port = htons ((unsigned short) XINT (service));
  else
    {
      struct servent *svc_info;
      CHECK_STRING (service);
      svc_info = getservbyname (SDATA (service),
				(socktype == SOCK_DGRAM ? "udp" : "tcp"));
      if (svc_info == 0)
	error ("Unknown service: %s", SDATA (service));
      port = svc_info->s_port;
    }

  bzero (&address_in, sizeof address_in);
  address_in.sin_family = family;
  address_in.sin_addr.s_addr = INADDR_ANY;
  address_in.sin_port = port;

#ifndef HAVE_GETADDRINFO
  if (!NILP (host))
    {
      struct hostent *host_info_ptr;

      /* gethostbyname may fail with TRY_AGAIN, but we don't honour that,
	 as it may `hang' emacs for a very long time.  */
      immediate_quit = 1;
      QUIT;
      host_info_ptr = gethostbyname (SDATA (host));
      immediate_quit = 0;

      if (host_info_ptr)
	{
	  bcopy (host_info_ptr->h_addr, (char *) &address_in.sin_addr,
		 host_info_ptr->h_length);
	  family = host_info_ptr->h_addrtype;
	  address_in.sin_family = family;
	}
      else
	/* Attempt to interpret host as numeric inet address */
	{
	  IN_ADDR numeric_addr;
	  numeric_addr = inet_addr ((char *) SDATA (host));
	  if (NUMERIC_ADDR_ERROR)
	    error ("Unknown host \"%s\"", SDATA (host));

	  bcopy ((char *)&numeric_addr, (char *) &address_in.sin_addr,
		 sizeof (address_in.sin_addr));
	}

    }
#endif /* not HAVE_GETADDRINFO */

  ai.ai_family = family;
  ai.ai_addr = (struct sockaddr *) &address_in;
  ai.ai_addrlen = sizeof address_in;

 open_socket:

  /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
     when connect is interrupted.  So let's not let it get interrupted.
     Note we do not turn off polling, because polling is only used
     when not interrupt_input, and thus not normally used on the systems
     which have this bug.  On systems which use polling, there's no way
     to quit if polling is turned off.  */
  if (interrupt_input
      && !is_server && socktype == SOCK_STREAM)
    {
      /* Comment from KFS: The original open-network-stream code
	 didn't unwind protect this, but it seems like the proper
	 thing to do.  In any case, I don't see how it could harm to
	 do this -- and it makes cleanup (using unbind_to) easier.  */
      record_unwind_protect (unwind_request_sigio, Qnil);
      unrequest_sigio ();
    }

  /* Do this in case we never enter the for-loop below.  */
  count1 = SPECPDL_INDEX ();
  s = -1;

  for (lres = res; lres; lres = lres->ai_next)
    {
      s = socket (lres->ai_family, lres->ai_socktype, lres->ai_protocol);
      if (s < 0)
	{
	  xerrno = errno;
	  continue;
	}

#ifdef DATAGRAM_SOCKETS
      if (!is_server && socktype == SOCK_DGRAM)
	break;
#endif /* DATAGRAM_SOCKETS */

#ifdef NON_BLOCKING_CONNECT
      if (is_non_blocking_client)
	{
#ifdef O_NONBLOCK
	  ret = fcntl (s, F_SETFL, O_NONBLOCK);
#else
	  ret = fcntl (s, F_SETFL, O_NDELAY);
#endif
	  if (ret < 0)
	    {
	      xerrno = errno;
	      emacs_close (s);
	      s = -1;
	      continue;
	    }
	}
#endif

      /* Make us close S if quit.  */
      record_unwind_protect (close_file_unwind, make_number (s));

      if (is_server)
	{
	  /* Configure as a server socket.  */
#ifdef HAVE_LOCAL_SOCKETS
	  if (family != AF_LOCAL)
#endif
	    {
	      int optval = 1;
	      if (setsockopt (s, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof optval))
		report_file_error ("Cannot set reuse option on server socket.", Qnil);
	    }

	  if (bind (s, lres->ai_addr, lres->ai_addrlen))
	    report_file_error ("Cannot bind server socket", Qnil);

#ifdef HAVE_GETSOCKNAME
	  if (EQ (service, Qt))
	    {
	      struct sockaddr_in sa1;
	      int len1 = sizeof (sa1);
	      if (getsockname (s, (struct sockaddr *)&sa1, &len1) == 0)
		{
		  ((struct sockaddr_in *)(lres->ai_addr))->sin_port = sa1.sin_port;
		  service = make_number (ntohs (sa1.sin_port));
		  contact = Fplist_put (contact, QCservice, service);
		}
	    }
#endif

	  if (socktype == SOCK_STREAM && listen (s, 5))
	    report_file_error ("Cannot listen on server socket", Qnil);

	  break;
	}

    retry_connect:

      immediate_quit = 1;
      QUIT;

      /* This turns off all alarm-based interrupts; the
	 bind_polling_period call above doesn't always turn all the
	 short-interval ones off, especially if interrupt_input is
	 set.

	 It'd be nice to be able to control the connect timeout
	 though.  Would non-blocking connect calls be portable?

	 This used to be conditioned by HAVE_GETADDRINFO.  Why?  */

      turn_on_atimers (0);

      ret = connect (s, lres->ai_addr, lres->ai_addrlen);
      xerrno = errno;

      turn_on_atimers (1);

      if (ret == 0 || xerrno == EISCONN)
	{
	  /* The unwind-protect will be discarded afterwards.
	     Likewise for immediate_quit.  */
	  break;
	}

#ifdef NON_BLOCKING_CONNECT
#ifdef EINPROGRESS
      if (is_non_blocking_client && xerrno == EINPROGRESS)
	break;
#else
#ifdef EWOULDBLOCK
      if (is_non_blocking_client && xerrno == EWOULDBLOCK)
	break;
#endif
#endif
#endif

      immediate_quit = 0;

      if (xerrno == EINTR)
	goto retry_connect;
      if (xerrno == EADDRINUSE && retry < 20)
	{
	  /* A delay here is needed on some FreeBSD systems,
	     and it is harmless, since this retrying takes time anyway
	     and should be infrequent.  */
	  Fsleep_for (make_number (1), Qnil);
	  retry++;
	  goto retry_connect;
	}

      /* Discard the unwind protect closing S.  */
      specpdl_ptr = specpdl + count1;
      emacs_close (s);
      s = -1;
    }

  if (s >= 0)
    {
#ifdef DATAGRAM_SOCKETS
      if (socktype == SOCK_DGRAM)
	{
	  if (datagram_address[s].sa)
	    abort ();
	  datagram_address[s].sa = (struct sockaddr *) xmalloc (lres->ai_addrlen);
	  datagram_address[s].len = lres->ai_addrlen;
	  if (is_server)
	    {
	      Lisp_Object remote;
	      bzero (datagram_address[s].sa, lres->ai_addrlen);
	      if (remote = Fplist_get (contact, QCremote), !NILP (remote))
		{
		  int rfamily, rlen;
		  rlen = get_lisp_to_sockaddr_size (remote, &rfamily);
		  if (rfamily == lres->ai_family && rlen == lres->ai_addrlen)
		    conv_lisp_to_sockaddr (rfamily, remote,
					   datagram_address[s].sa, rlen);
		}
	    }
	  else
	    bcopy (lres->ai_addr, datagram_address[s].sa, lres->ai_addrlen);
	}
#endif
      contact = Fplist_put (contact, QCaddress,
			    conv_sockaddr_to_lisp (lres->ai_addr, lres->ai_addrlen));
#ifdef HAVE_GETSOCKNAME
      if (!is_server)
	{
	  struct sockaddr_in sa1;
	  int len1 = sizeof (sa1);
	  if (getsockname (s, (struct sockaddr *)&sa1, &len1) == 0)
	    contact = Fplist_put (contact, QClocal,
				  conv_sockaddr_to_lisp (&sa1, len1));
	}
#endif
    }

#ifdef HAVE_GETADDRINFO
  if (res != &ai)
    freeaddrinfo (res);
#endif

  immediate_quit = 0;

  /* Discard the unwind protect for closing S, if any.  */
  specpdl_ptr = specpdl + count1;

  /* Unwind bind_polling_period and request_sigio.  */
  unbind_to (count, Qnil);

  if (s < 0)
    {
      /* If non-blocking got this far - and failed - assume non-blocking is
	 not supported after all.  This is probably a wrong assumption, but
	 the normal blocking calls to open-network-stream handles this error
	 better.  */
      if (is_non_blocking_client)
	  return Qnil;

      errno = xerrno;
      if (is_server)
	report_file_error ("make server process failed", contact);
      else
	report_file_error ("make client process failed", contact);
    }

  tem = Fplist_get (contact, QCoptions);
  if (!NILP (tem))
    set_socket_options (s, tem, 1);

#endif /* not TERM */

  inch = s;
  outch = s;

  if (!NILP (buffer))
    buffer = Fget_buffer_create (buffer);
  proc = make_process (name);

  chan_process[inch] = proc;

#ifdef O_NONBLOCK
  fcntl (inch, F_SETFL, O_NONBLOCK);
#else
#ifdef O_NDELAY
  fcntl (inch, F_SETFL, O_NDELAY);
#endif
#endif

  p = XPROCESS (proc);

  p->childp = contact;
  p->plist = Fcopy_sequence (Fplist_get (contact, QCplist));

  p->buffer = buffer;
  p->sentinel = sentinel;
  p->filter = filter;
  p->filter_multibyte = buffer_defaults.enable_multibyte_characters;
  /* Override the above only if :filter-multibyte is specified.  */
  if (! NILP (Fplist_member (contact, QCfilter_multibyte)))
    p->filter_multibyte = Fplist_get (contact, QCfilter_multibyte);
  p->log = Fplist_get (contact, QClog);
  if (tem = Fplist_get (contact, QCnoquery), !NILP (tem))
    p->kill_without_query = Qt;
  if ((tem = Fplist_get (contact, QCstop), !NILP (tem)))
    p->command = Qt;
  p->pid = Qnil;
  XSETINT (p->infd, inch);
  XSETINT (p->outfd, outch);
  if (is_server && socktype == SOCK_STREAM)
    p->status = Qlisten;

#ifdef NON_BLOCKING_CONNECT
  if (is_non_blocking_client)
    {
      /* We may get here if connect did succeed immediately.  However,
	 in that case, we still need to signal this like a non-blocking
	 connection.  */
      p->status = Qconnect;
      if (!FD_ISSET (inch, &connect_wait_mask))
	{
	  FD_SET (inch, &connect_wait_mask);
	  num_pending_connects++;
	}
    }
  else
#endif
    /* A server may have a client filter setting of Qt, but it must
       still listen for incoming connects unless it is stopped.  */
    if ((!EQ (p->filter, Qt) && !EQ (p->command, Qt))
	|| (EQ (p->status, Qlisten) && NILP (p->command)))
      {
	FD_SET (inch, &input_wait_mask);
	FD_SET (inch, &non_keyboard_wait_mask);
      }

  if (inch > max_process_desc)
    max_process_desc = inch;

  tem = Fplist_member (contact, QCcoding);
  if (!NILP (tem) && (!CONSP (tem) || !CONSP (XCDR (tem))))
    tem = Qnil;  /* No error message (too late!).  */

  {
    /* Setup coding systems for communicating with the network stream.  */
    struct gcpro gcpro1;
    /* Qt denotes we have not yet called Ffind_operation_coding_system.  */
    Lisp_Object coding_systems = Qt;
    Lisp_Object args[5], val;

    if (!NILP (tem))
      val = XCAR (XCDR (tem));
    else if (!NILP (Vcoding_system_for_read))
      val = Vcoding_system_for_read;
    else if ((!NILP (buffer) && NILP (XBUFFER (buffer)->enable_multibyte_characters))
	     || (NILP (buffer) && NILP (buffer_defaults.enable_multibyte_characters)))
      /* We dare not decode end-of-line format by setting VAL to
	 Qraw_text, because the existing Emacs Lisp libraries
	 assume that they receive bare code including a sequene of
	 CR LF.  */
      val = Qnil;
    else
      {
	if (NILP (host) || NILP (service))
	  coding_systems = Qnil;
	else
	  {
	    args[0] = Qopen_network_stream, args[1] = name,
	      args[2] = buffer, args[3] = host, args[4] = service;
	    GCPRO1 (proc);
	    coding_systems = Ffind_operation_coding_system (5, args);
	    UNGCPRO;
	  }
	if (CONSP (coding_systems))
	  val = XCAR (coding_systems);
	else if (CONSP (Vdefault_process_coding_system))
	  val = XCAR (Vdefault_process_coding_system);
	else
	  val = Qnil;
      }
    p->decode_coding_system = val;

    if (!NILP (tem))
      val = XCAR (XCDR (tem));
    else if (!NILP (Vcoding_system_for_write))
      val = Vcoding_system_for_write;
    else if (NILP (current_buffer->enable_multibyte_characters))
      val = Qnil;
    else
      {
	if (EQ (coding_systems, Qt))
	  {
	    if (NILP (host) || NILP (service))
	      coding_systems = Qnil;
	    else
	      {
		args[0] = Qopen_network_stream, args[1] = name,
		  args[2] = buffer, args[3] = host, args[4] = service;
		GCPRO1 (proc);
		coding_systems = Ffind_operation_coding_system (5, args);
		UNGCPRO;
	      }
	  }
	if (CONSP (coding_systems))
	  val = XCDR (coding_systems);
	else if (CONSP (Vdefault_process_coding_system))
	  val = XCDR (Vdefault_process_coding_system);
	else
	  val = Qnil;
      }
    p->encode_coding_system = val;
  }
  setup_process_coding_systems (proc);

  p->decoding_buf = make_uninit_string (0);
  p->decoding_carryover = make_number (0);
  p->encoding_buf = make_uninit_string (0);
  p->encoding_carryover = make_number (0);

  p->inherit_coding_system_flag
    = (!NILP (tem) || NILP (buffer) || !inherit_process_coding_system
       ? Qnil : Qt);

  UNGCPRO;
  return proc;
}
#endif	/* HAVE_SOCKETS */

void
deactivate_process (proc)
     Lisp_Object proc;
{
  register int inchannel, outchannel;
  register struct Lisp_Process *p = XPROCESS (proc);

  inchannel = XINT (p->infd);
  outchannel = XINT (p->outfd);

  if (inchannel >= 0)
    {
      /* Beware SIGCHLD hereabouts. */
      flush_pending_output (inchannel);
#ifdef VMS
      {
	VMS_PROC_STUFF *get_vms_process_pointer (), *vs;
	sys$dassgn (outchannel);
	vs = get_vms_process_pointer (p->pid);
	if (vs)
	  give_back_vms_process_stuff (vs);
      }
#else
      emacs_close (inchannel);
      if (outchannel >= 0 && outchannel != inchannel)
 	emacs_close (outchannel);
#endif

      XSETINT (p->infd, -1);
      XSETINT (p->outfd, -1);
#ifdef DATAGRAM_SOCKETS
      if (DATAGRAM_CHAN_P (inchannel))
	{
	  xfree (datagram_address[inchannel].sa);
	  datagram_address[inchannel].sa = 0;
	  datagram_address[inchannel].len = 0;
	}
#endif
      chan_process[inchannel] = Qnil;
      FD_CLR (inchannel, &input_wait_mask);
      FD_CLR (inchannel, &non_keyboard_wait_mask);
      if (FD_ISSET (inchannel, &connect_wait_mask))
	{
	  FD_CLR (inchannel, &connect_wait_mask);
	  if (--num_pending_connects < 0)
	    abort ();
	}
      if (inchannel == max_process_desc)
	{
	  int i;
	  /* We just closed the highest-numbered process input descriptor,
	     so recompute the highest-numbered one now.  */
	  max_process_desc = 0;
	  for (i = 0; i < MAXDESC; i++)
	    if (!NILP (chan_process[i]))
	      max_process_desc = i;
	}
    }
}

/* Close all descriptors currently in use for communication
   with subprocess.  This is used in a newly-forked subprocess
   to get rid of irrelevant descriptors.  */

void
close_process_descs ()
{
#ifndef WINDOWSNT
  int i;
  for (i = 0; i < MAXDESC; i++)
    {
      Lisp_Object process;
      process = chan_process[i];
      if (!NILP (process))
	{
	  int in = XINT (XPROCESS (process)->infd);
	  int out = XINT (XPROCESS (process)->outfd);
	  if (in >= 0)
	    emacs_close (in);
	  if (out >= 0 && in != out)
	    emacs_close (out);
	}
    }
#endif
}

DEFUN ("accept-process-output", Faccept_process_output, Saccept_process_output,
       0, 3, 0,
       doc: /* Allow any pending output from subprocesses to be read by Emacs.
It is read into the process' buffers or given to their filter functions.
Non-nil arg PROCESS means do not return until some output has been received
from PROCESS.
Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of
seconds and microseconds to wait; return after that much time whether
or not there is input.
Return non-nil iff we received any output before the timeout expired.  */)
     (process, timeout, timeout_msecs)
     register Lisp_Object process, timeout, timeout_msecs;
{
  int seconds;
  int useconds;

  if (! NILP (process))
    CHECK_PROCESS (process);

  if (! NILP (timeout_msecs))
    {
      CHECK_NUMBER (timeout_msecs);
      useconds = XINT (timeout_msecs);
      if (!INTEGERP (timeout))
	XSETINT (timeout, 0);

      {
	int carry = useconds / 1000000;

	XSETINT (timeout, XINT (timeout) + carry);
	useconds -= carry * 1000000;

	/* I think this clause is necessary because C doesn't
	   guarantee a particular rounding direction for negative
	   integers.  */
	if (useconds < 0)
	  {
	    XSETINT (timeout, XINT (timeout) - 1);
	    useconds += 1000000;
	  }
      }
    }
  else
    useconds = 0;

  if (! NILP (timeout))
    {
      CHECK_NUMBER (timeout);
      seconds = XINT (timeout);
      if (seconds < 0 || (seconds == 0 && useconds == 0))
	seconds = -1;
    }
  else
    seconds = NILP (process) ? -1 : 0;

  if (NILP (process))
    XSETFASTINT (process, 0);

  return
    (wait_reading_process_input (seconds, useconds, process, 0)
     ? Qt : Qnil);
}

/* Accept a connection for server process SERVER on CHANNEL.  */

static int connect_counter = 0;

static void
server_accept_connection (server, channel)
     Lisp_Object server;
     int channel;
{
  Lisp_Object proc, caller, name, buffer;
  Lisp_Object contact, host, service;
  struct Lisp_Process *ps= XPROCESS (server);
  struct Lisp_Process *p;
  int s;
  union u_sockaddr {
    struct sockaddr sa;
    struct sockaddr_in in;
#ifdef HAVE_LOCAL_SOCKETS
    struct sockaddr_un un;
#endif
  } saddr;
  int len = sizeof saddr;

  s = accept (channel, &saddr.sa, &len);

  if (s < 0)
    {
      int code = errno;

      if (code == EAGAIN)
	return;
#ifdef EWOULDBLOCK
      if (code == EWOULDBLOCK)
	return;
#endif

      if (!NILP (ps->log))
	call3 (ps->log, server, Qnil,
	       concat3 (build_string ("accept failed with code"),
			Fnumber_to_string (make_number (code)),
			build_string ("\n")));
      return;
    }

  connect_counter++;

  /* Setup a new process to handle the connection.  */

  /* Generate a unique identification of the caller, and build contact
     information for this process.  */
  host = Qt;
  service = Qnil;
  switch (saddr.sa.sa_family)
    {
    case AF_INET:
      {
	Lisp_Object args[5];
	unsigned char *ip = (unsigned char *)&saddr.in.sin_addr.s_addr;
	args[0] = build_string ("%d.%d.%d.%d");
	args[1] = make_number (*ip++);
	args[2] = make_number (*ip++);
	args[3] = make_number (*ip++);
	args[4] = make_number (*ip++);
	host = Fformat (5, args);
	service = make_number (ntohs (saddr.in.sin_port));

	args[0] = build_string (" <%s:%d>");
	args[1] = host;
	args[2] = service;
	caller = Fformat (3, args);
      }
      break;

#ifdef HAVE_LOCAL_SOCKETS
    case AF_LOCAL:
#endif
    default:
      caller = Fnumber_to_string (make_number (connect_counter));
      caller = concat3 (build_string (" <*"), caller, build_string ("*>"));
      break;
    }

  /* Create a new buffer name for this process if it doesn't have a
     filter.  The new buffer name is based on the buffer name or
     process name of the server process concatenated with the caller
     identification.  */

  if (!NILP (ps->filter) && !EQ (ps->filter, Qt))
    buffer = Qnil;
  else
    {
      buffer = ps->buffer;
      if (!NILP (buffer))
	buffer = Fbuffer_name (buffer);
      else
	buffer = ps->name;
      if (!NILP (buffer))
	{
	  buffer = concat2 (buffer, caller);
	  buffer = Fget_buffer_create (buffer);
	}
    }

  /* Generate a unique name for the new server process.  Combine the
     server process name with the caller identification.  */

  name = concat2 (ps->name, caller);
  proc = make_process (name);

  chan_process[s] = proc;

#ifdef O_NONBLOCK
  fcntl (s, F_SETFL, O_NONBLOCK);
#else
#ifdef O_NDELAY
  fcntl (s, F_SETFL, O_NDELAY);
#endif
#endif

  p = XPROCESS (proc);

  /* Build new contact information for this setup.  */
  contact = Fcopy_sequence (ps->childp);
  contact = Fplist_put (contact, QCserver, Qnil);
  contact = Fplist_put (contact, QChost, host);
  if (!NILP (service))
    contact = Fplist_put (contact, QCservice, service);
  contact = Fplist_put (contact, QCremote,
			conv_sockaddr_to_lisp (&saddr.sa, len));
#ifdef HAVE_GETSOCKNAME
  len = sizeof saddr;
  if (getsockname (s, &saddr.sa, &len) == 0)
    contact = Fplist_put (contact, QClocal,
			  conv_sockaddr_to_lisp (&saddr.sa, len));
#endif

  p->childp = contact;
  p->plist = Fcopy_sequence (ps->plist);

  p->buffer = buffer;
  p->sentinel = ps->sentinel;
  p->filter = ps->filter;
  p->command = Qnil;
  p->pid = Qnil;
  XSETINT (p->infd, s);
  XSETINT (p->outfd, s);
  p->status = Qrun;

  /* Client processes for accepted connections are not stopped initially.  */
  if (!EQ (p->filter, Qt))
    {
      FD_SET (s, &input_wait_mask);
      FD_SET (s, &non_keyboard_wait_mask);
    }

  if (s > max_process_desc)
    max_process_desc = s;

  /* Setup coding system for new process based on server process.
     This seems to be the proper thing to do, as the coding system
     of the new process should reflect the settings at the time the
     server socket was opened; not the current settings. */

  p->decode_coding_system = ps->decode_coding_system;
  p->encode_coding_system = ps->encode_coding_system;
  setup_process_coding_systems (proc);

  p->decoding_buf = make_uninit_string (0);
  p->decoding_carryover = make_number (0);
  p->encoding_buf = make_uninit_string (0);
  p->encoding_carryover = make_number (0);

  p->inherit_coding_system_flag
    = (NILP (buffer) ? Qnil : ps->inherit_coding_system_flag);

  if (!NILP (ps->log))
      call3 (ps->log, server, proc,
	     concat3 (build_string ("accept from "),
		      (STRINGP (host) ? host : build_string ("-")),
		      build_string ("\n")));

  if (!NILP (p->sentinel))
    exec_sentinel (proc,
		   concat3 (build_string ("open from "),
			    (STRINGP (host) ? host : build_string ("-")),
			    build_string ("\n")));
}

/* This variable is different from waiting_for_input in keyboard.c.
   It is used to communicate to a lisp process-filter/sentinel (via the
   function Fwaiting_for_user_input_p below) whether emacs was waiting
   for user-input when that process-filter was called.
   waiting_for_input cannot be used as that is by definition 0 when
   lisp code is being evalled.
   This is also used in record_asynch_buffer_change.
   For that purpose, this must be 0
   when not inside wait_reading_process_input.  */
static int waiting_for_user_input_p;

/* This is here so breakpoints can be put on it.  */
static void
wait_reading_process_input_1 ()
{
}

/* Read and dispose of subprocess output while waiting for timeout to
   elapse and/or keyboard input to be available.

   TIME_LIMIT is:
     timeout in seconds, or
     zero for no limit, or
     -1 means gobble data immediately available but don't wait for any.

   MICROSECS is:
     an additional duration to wait, measured in microseconds.
     If this is nonzero and time_limit is 0, then the timeout
     consists of MICROSECS only.

   READ_KBD is a lisp value:
     0 to ignore keyboard input, or
     1 to return when input is available, or
     -1 meaning caller will actually read the input, so don't throw to
       the quit handler, or
     a cons cell, meaning wait until its car is non-nil
       (and gobble terminal input into the buffer if any arrives), or
     a process object, meaning wait until something arrives from that
       process.  The return value is true iff we read some input from
       that process.

   DO_DISPLAY != 0 means redisplay should be done to show subprocess
   output that arrives.

   If READ_KBD is a pointer to a struct Lisp_Process, then the
     function returns true iff we received input from that process
     before the timeout elapsed.
   Otherwise, return true iff we received input from any process.  */

int
wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
     int time_limit, microsecs;
     Lisp_Object read_kbd;
     int do_display;
{
  register int channel, nfds;
  static SELECT_TYPE Available;
  static SELECT_TYPE Connecting;
  int check_connect, no_avail;
  int xerrno;
  Lisp_Object proc;
  EMACS_TIME timeout, end_time;
  int wait_channel = -1;
  struct Lisp_Process *wait_proc = 0;
  int got_some_input = 0;
  /* Either nil or a cons cell, the car of which is of interest and
     may be changed outside of this routine.  */
  Lisp_Object wait_for_cell = Qnil;

  FD_ZERO (&Available);
  FD_ZERO (&Connecting);

  /* If read_kbd is a process to watch, set wait_proc and wait_channel
     accordingly.  */
  if (PROCESSP (read_kbd))
    {
      wait_proc = XPROCESS (read_kbd);
      wait_channel = XINT (wait_proc->infd);
      XSETFASTINT (read_kbd, 0);
    }

  /* If waiting for non-nil in a cell, record where.  */
  if (CONSP (read_kbd))
    {
      wait_for_cell = read_kbd;
      XSETFASTINT (read_kbd, 0);
    }

  waiting_for_user_input_p = XINT (read_kbd);

  /* Since we may need to wait several times,
     compute the absolute time to return at.  */
  if (time_limit || microsecs)
    {
      EMACS_GET_TIME (end_time);
      EMACS_SET_SECS_USECS (timeout, time_limit, microsecs);
      EMACS_ADD_TIME (end_time, end_time, timeout);
    }
#ifdef POLL_INTERRUPTED_SYS_CALL
  /* AlainF 5-Jul-1996
     HP-UX 10.10 seem to have problems with signals coming in
     Causes "poll: interrupted system call" messages when Emacs is run
     in an X window
     Turn off periodic alarms (in case they are in use),
     and then turn off any other atimers.  */
  stop_polling ();
  turn_on_atimers (0);
#endif /* POLL_INTERRUPTED_SYS_CALL */

  while (1)
    {
      int timeout_reduced_for_timers = 0;

      /* If calling from keyboard input, do not quit
	 since we want to return C-g as an input character.
	 Otherwise, do pending quit if requested.  */
      if (XINT (read_kbd) >= 0)
	QUIT;

      /* Exit now if the cell we're waiting for became non-nil.  */
      if (! NILP (wait_for_cell) && ! NILP (XCAR (wait_for_cell)))
	break;

      /* Compute time from now till when time limit is up */
      /* Exit if already run out */
      if (time_limit == -1)
	{
	  /* -1 specified for timeout means
	     gobble output available now
	     but don't wait at all. */

	  EMACS_SET_SECS_USECS (timeout, 0, 0);
	}
      else if (time_limit || microsecs)
	{
	  EMACS_GET_TIME (timeout);
	  EMACS_SUB_TIME (timeout, end_time, timeout);
	  if (EMACS_TIME_NEG_P (timeout))
	    break;
	}
      else
	{
	  EMACS_SET_SECS_USECS (timeout, 100000, 0);
	}

      /* Normally we run timers here.
	 But not if wait_for_cell; in those cases,
	 the wait is supposed to be short,
	 and those callers cannot handle running arbitrary Lisp code here.  */
      if (NILP (wait_for_cell))
	{
	  EMACS_TIME timer_delay;

	  do
	    {
	      int old_timers_run = timers_run;
	      struct buffer *old_buffer = current_buffer;

	      timer_delay = timer_check (1);

	      /* If a timer has run, this might have changed buffers
		 an alike.  Make read_key_sequence aware of that.  */
	      if (timers_run != old_timers_run
		  && old_buffer != current_buffer
		  && waiting_for_user_input_p == -1)
		record_asynch_buffer_change ();

	      if (timers_run != old_timers_run && do_display)
		/* We must retry, since a timer may have requeued itself
		   and that could alter the time_delay.  */
		redisplay_preserve_echo_area (9);
	      else
		break;
	    }
	  while (!detect_input_pending ());

	  /* If there is unread keyboard input, also return.  */
	  if (XINT (read_kbd) != 0
	      && requeued_events_pending_p ())
	    break;

	  if (! EMACS_TIME_NEG_P (timer_delay) && time_limit != -1)
	    {
	      EMACS_TIME difference;
	      EMACS_SUB_TIME (difference, timer_delay, timeout);
	      if (EMACS_TIME_NEG_P (difference))
		{
		  timeout = timer_delay;
		  timeout_reduced_for_timers = 1;
		}
	    }
	  /* If time_limit is -1, we are not going to wait at all.  */
	  else if (time_limit != -1)
	    {
	      /* This is so a breakpoint can be put here.  */
	      wait_reading_process_input_1 ();
	    }
	}

      /* Cause C-g and alarm signals to take immediate action,
	 and cause input available signals to zero out timeout.

	 It is important that we do this before checking for process
	 activity.  If we get a SIGCHLD after the explicit checks for
	 process activity, timeout is the only way we will know.  */
      if (XINT (read_kbd) < 0)
	set_waiting_for_input (&timeout);

      /* If status of something has changed, and no input is
	 available, notify the user of the change right away.  After
	 this explicit check, we'll let the SIGCHLD handler zap
	 timeout to get our attention.  */
      if (update_tick != process_tick && do_display)
	{
	  SELECT_TYPE Atemp, Ctemp;

	  Atemp = input_wait_mask;
#ifdef MAC_OSX
          /* On Mac OS X, the SELECT system call always says input is
             present (for reading) at stdin, even when none is.  This
             causes the call to SELECT below to return 1 and
             status_notify not to be called.  As a result output of
             subprocesses are incorrectly discarded.  */
          FD_CLR (0, &Atemp);
#endif
	  Ctemp = connect_wait_mask;
	  EMACS_SET_SECS_USECS (timeout, 0, 0);
	  if ((select (max (max_process_desc, max_keyboard_desc) + 1,
		       &Atemp,
		       (num_pending_connects > 0 ? &Ctemp : (SELECT_TYPE *)0),
		       (SELECT_TYPE *)0, &timeout)
	       <= 0))
	    {
	      /* It's okay for us to do this and then continue with
		 the loop, since timeout has already been zeroed out.  */
	      clear_waiting_for_input ();
	      status_notify ();
	    }
	}

      /* Don't wait for output from a non-running process.  Just
         read whatever data has already been received.  */
      if (wait_proc != 0 && !NILP (wait_proc->raw_status_low))
	update_status (wait_proc);
      if (wait_proc != 0
	  && ! EQ (wait_proc->status, Qrun)
	  && ! EQ (wait_proc->status, Qconnect))
	{
	  int nread, total_nread = 0;

	  clear_waiting_for_input ();
	  XSETPROCESS (proc, wait_proc);

	  /* Read data from the process, until we exhaust it.  */
	  while (XINT (wait_proc->infd) >= 0)
	    {
	      nread = read_process_output (proc, XINT (wait_proc->infd));

	      if (nread == 0)
		break;

              if (0 < nread)
                total_nread += nread;
#ifdef EIO
	      else if (nread == -1 && EIO == errno)
                break;
#endif
#ifdef EAGAIN
	      else if (nread == -1 && EAGAIN == errno)
                break;
#endif
#ifdef EWOULDBLOCK
	      else if (nread == -1 && EWOULDBLOCK == errno)
                break;
#endif
	    }
	  if (total_nread > 0 && do_display)
	    redisplay_preserve_echo_area (10);

	  break;
	}

      /* Wait till there is something to do */

      if (!NILP (wait_for_cell))
	{
	  Available = non_process_wait_mask;
	  check_connect = 0;
	}
      else
	{
	  if (! XINT (read_kbd))
	    Available = non_keyboard_wait_mask;
	  else
	    Available = input_wait_mask;
	  check_connect = (num_pending_connects > 0);
	}

      /* If frame size has changed or the window is newly mapped,
	 redisplay now, before we start to wait.  There is a race
	 condition here; if a SIGIO arrives between now and the select
	 and indicates that a frame is trashed, the select may block
	 displaying a trashed screen.  */
      if (frame_garbaged && do_display)
	{
	  clear_waiting_for_input ();
	  redisplay_preserve_echo_area (11);
	  if (XINT (read_kbd) < 0)
	    set_waiting_for_input (&timeout);
	}

      no_avail = 0;
      if (XINT (read_kbd) && detect_input_pending ())
	{
	  nfds = 0;
	  no_avail = 1;
	}
      else
	{
	  if (check_connect)
	    Connecting = connect_wait_mask;
	  nfds = select (max (max_process_desc, max_keyboard_desc) + 1,
			 &Available,
			 (check_connect ? &Connecting : (SELECT_TYPE *)0),
			 (SELECT_TYPE *)0, &timeout);
	}

      xerrno = errno;

      /* Make C-g and alarm signals set flags again */
      clear_waiting_for_input ();

      /*  If we woke up due to SIGWINCH, actually change size now.  */
      do_pending_window_change (0);

      if (time_limit && nfds == 0 && ! timeout_reduced_for_timers)
	/* We wanted the full specified time, so return now.  */
	break;
      if (nfds < 0)
	{
	  if (xerrno == EINTR)
	    no_avail = 1;
#ifdef ultrix
	  /* Ultrix select seems to return ENOMEM when it is
	     interrupted.  Treat it just like EINTR.  Bleah.  Note
	     that we want to test for the "ultrix" CPP symbol, not
	     "__ultrix__"; the latter is only defined under GCC, but
	     not by DEC's bundled CC.  -JimB  */
	  else if (xerrno == ENOMEM)
	    no_avail = 1;
#endif
#ifdef ALLIANT
	  /* This happens for no known reason on ALLIANT.
	     I am guessing that this is the right response. -- RMS.  */
	  else if (xerrno == EFAULT)
	    no_avail = 1;
#endif
	  else if (xerrno == EBADF)
	    {
#ifdef AIX
	      /* AIX doesn't handle PTY closure the same way BSD does.  On AIX,
		 the child's closure of the pts gives the parent a SIGHUP, and
		 the ptc file descriptor is automatically closed,
		 yielding EBADF here or at select() call above.
		 So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF
		 in m/ibmrt-aix.h), and here we just ignore the select error.
		 Cleanup occurs c/o status_notify after SIGCLD. */
	      no_avail = 1; /* Cannot depend on values returned */
#else
	      abort ();
#endif
	    }
	  else
	    error ("select error: %s", emacs_strerror (xerrno));
	}

      if (no_avail)
	{
	  FD_ZERO (&Available);
	  check_connect = 0;
	}

#if defined(sun) && !defined(USG5_4)
      if (nfds > 0 && keyboard_bit_set (&Available)
	  && interrupt_input)
	/* System sometimes fails to deliver SIGIO.

	   David J. Mackenzie says that Emacs doesn't compile under
	   Solaris if this code is enabled, thus the USG5_4 in the CPP
	   conditional.  "I haven't noticed any ill effects so far.
	   If you find a Solaris expert somewhere, they might know
	   better." */
	kill (getpid (), SIGIO);
#endif

#if 0 /* When polling is used, interrupt_input is 0,
	 so get_input_pending should read the input.
	 So this should not be needed.  */
      /* If we are using polling for input,
	 and we see input available, make it get read now.
	 Otherwise it might not actually get read for a second.
	 And on hpux, since we turn off polling in wait_reading_process_input,
	 it might never get read at all if we don't spend much time
	 outside of wait_reading_process_input.  */
      if (XINT (read_kbd) && interrupt_input
	  && keyboard_bit_set (&Available)
	  && input_polling_used ())
	kill (getpid (), SIGALRM);
#endif

      /* Check for keyboard input */
      /* If there is any, return immediately
	 to give it higher priority than subprocesses */

      if (XINT (read_kbd) != 0)
	{
	  int old_timers_run = timers_run;
	  struct buffer *old_buffer = current_buffer;
	  int leave = 0;

	  if (detect_input_pending_run_timers (do_display))
	    {
	      swallow_events (do_display);
	      if (detect_input_pending_run_timers (do_display))
		leave = 1;
	    }

	  /* If a timer has run, this might have changed buffers
	     an alike.  Make read_key_sequence aware of that.  */
	  if (timers_run != old_timers_run
	      && waiting_for_user_input_p == -1
	      && old_buffer != current_buffer)
	    record_asynch_buffer_change ();

	  if (leave)
	    break;
	}

      /* If there is unread keyboard input, also return.  */
      if (XINT (read_kbd) != 0
	  && requeued_events_pending_p ())
	break;

      /* If we are not checking for keyboard input now,
	 do process events (but don't run any timers).
	 This is so that X events will be processed.
	 Otherwise they may have to wait until polling takes place.
	 That would causes delays in pasting selections, for example.

	 (We used to do this only if wait_for_cell.)  */
      if (XINT (read_kbd) == 0 && detect_input_pending ())
	{
	  swallow_events (do_display);
#if 0  /* Exiting when read_kbd doesn't request that seems wrong, though.  */
	  if (detect_input_pending ())
	    break;
#endif
	}

      /* Exit now if the cell we're waiting for became non-nil.  */
      if (! NILP (wait_for_cell) && ! NILP (XCAR (wait_for_cell)))
	break;

#ifdef SIGIO
      /* If we think we have keyboard input waiting, but didn't get SIGIO,
	 go read it.  This can happen with X on BSD after logging out.
	 In that case, there really is no input and no SIGIO,
	 but select says there is input.  */

      if (XINT (read_kbd) && interrupt_input
	  && keyboard_bit_set (&Available) && ! noninteractive)
	kill (getpid (), SIGIO);
#endif

      if (! wait_proc)
	got_some_input |= nfds > 0;

      /* If checking input just got us a size-change event from X,
	 obey it now if we should.  */
      if (XINT (read_kbd) || ! NILP (wait_for_cell))
	do_pending_window_change (0);

      /* Check for data from a process.  */
      if (no_avail || nfds == 0)
	continue;

      /* Really FIRST_PROC_DESC should be 0 on Unix,
	 but this is safer in the short run.  */
      for (channel = 0; channel <= max_process_desc; channel++)
	{
	  if (FD_ISSET (channel, &Available)
	      && FD_ISSET (channel, &non_keyboard_wait_mask))
	    {
	      int nread;

	      /* If waiting for this channel, arrange to return as
		 soon as no more input to be processed.  No more
		 waiting.  */
	      if (wait_channel == channel)
		{
		  wait_channel = -1;
		  time_limit = -1;
		  got_some_input = 1;
		}
	      proc = chan_process[channel];
	      if (NILP (proc))
		continue;

	      /* If this is a server stream socket, accept connection.  */
	      if (EQ (XPROCESS (proc)->status, Qlisten))
		{
		  server_accept_connection (proc, channel);
		  continue;
		}

	      /* Read data from the process, starting with our
		 buffered-ahead character if we have one.  */

	      nread = read_process_output (proc, channel);
	      if (nread > 0)
		{
		  /* Since read_process_output can run a filter,
		     which can call accept-process-output,
		     don't try to read from any other processes
		     before doing the select again.  */
		  FD_ZERO (&Available);

		  if (do_display)
		    redisplay_preserve_echo_area (12);
		}
#ifdef EWOULDBLOCK
	      else if (nread == -1 && errno == EWOULDBLOCK)
		;
#endif
	      /* ISC 4.1 defines both EWOULDBLOCK and O_NONBLOCK,
		 and Emacs uses O_NONBLOCK, so what we get is EAGAIN.  */
#ifdef O_NONBLOCK
	      else if (nread == -1 && errno == EAGAIN)
		;
#else
#ifdef O_NDELAY
	      else if (nread == -1 && errno == EAGAIN)
		;
	      /* Note that we cannot distinguish between no input
		 available now and a closed pipe.
		 With luck, a closed pipe will be accompanied by
		 subprocess termination and SIGCHLD.  */
	      else if (nread == 0 && !NETCONN_P (proc))
		;
#endif				/* O_NDELAY */
#endif				/* O_NONBLOCK */
#ifdef HAVE_PTYS
	      /* On some OSs with ptys, when the process on one end of
		 a pty exits, the other end gets an error reading with
		 errno = EIO instead of getting an EOF (0 bytes read).
		 Therefore, if we get an error reading and errno =
		 EIO, just continue, because the child process has
		 exited and should clean itself up soon (e.g. when we
		 get a SIGCHLD).

		 However, it has been known to happen that the SIGCHLD
		 got lost.  So raise the signl again just in case.
		 It can't hurt.  */
	      else if (nread == -1 && errno == EIO)
		kill (getpid (), SIGCHLD);
#endif				/* HAVE_PTYS */
	      /* If we can detect process termination, don't consider the process
		 gone just because its pipe is closed.  */
#ifdef SIGCHLD
	      else if (nread == 0 && !NETCONN_P (proc))
		;
#endif
	      else
		{
		  /* Preserve status of processes already terminated.  */
		  XSETINT (XPROCESS (proc)->tick, ++process_tick);
		  deactivate_process (proc);
		  if (!NILP (XPROCESS (proc)->raw_status_low))
		    update_status (XPROCESS (proc));
		  if (EQ (XPROCESS (proc)->status, Qrun))
		    XPROCESS (proc)->status
		      = Fcons (Qexit, Fcons (make_number (256), Qnil));
		}
	    }
#ifdef NON_BLOCKING_CONNECT
	  if (check_connect && FD_ISSET (channel, &Connecting))
	    {
	      struct Lisp_Process *p;

	      FD_CLR (channel, &connect_wait_mask);
	      if (--num_pending_connects < 0)
		abort ();

	      proc = chan_process[channel];
	      if (NILP (proc))
		continue;

	      p = XPROCESS (proc);

#ifdef GNU_LINUX
	      /* getsockopt(,,SO_ERROR,,) is said to hang on some systems.
	         So only use it on systems where it is known to work.  */
	      {
		int xlen = sizeof(xerrno);
		if (getsockopt(channel, SOL_SOCKET, SO_ERROR, &xerrno, &xlen))
		  xerrno = errno;
	      }
#else
	      {
		struct sockaddr pname;
		int pnamelen = sizeof(pname);

		/* If connection failed, getpeername will fail.  */
		xerrno = 0;
		if (getpeername(channel, &pname, &pnamelen) < 0)
		  {
		    /* Obtain connect failure code through error slippage.  */
		    char dummy;
		    xerrno = errno;
		    if (errno == ENOTCONN && read(channel, &dummy, 1) < 0)
		      xerrno = errno;
		  }
	      }
#endif
	      if (xerrno)
		{
		  XSETINT (p->tick, ++process_tick);
		  p->status = Fcons (Qfailed, Fcons (make_number (xerrno), Qnil));
		  deactivate_process (proc);
		}
	      else
		{
		  p->status = Qrun;
		  /* Execute the sentinel here.  If we had relied on
		     status_notify to do it later, it will read input
		     from the process before calling the sentinel.  */
		  exec_sentinel (proc, build_string ("open\n"));
		  if (!EQ (p->filter, Qt) && !EQ (p->command, Qt))
		    {
		      FD_SET (XINT (p->infd), &input_wait_mask);
		      FD_SET (XINT (p->infd), &non_keyboard_wait_mask);
		    }
		}
	    }
#endif /* NON_BLOCKING_CONNECT */
	}			/* end for each file descriptor */
    }				/* end while exit conditions not met */

  waiting_for_user_input_p = 0;

  /* If calling from keyboard input, do not quit
     since we want to return C-g as an input character.
     Otherwise, do pending quit if requested.  */
  if (XINT (read_kbd) >= 0)
    {
      /* Prevent input_pending from remaining set if we quit.  */
      clear_input_pending ();
      QUIT;
    }
#ifdef POLL_INTERRUPTED_SYS_CALL
  /* AlainF 5-Jul-1996
     HP-UX 10.10 seems to have problems with signals coming in
     Causes "poll: interrupted system call" messages when Emacs is run
     in an X window
     Turn periodic alarms back on */
  start_polling ();
#endif /* POLL_INTERRUPTED_SYS_CALL */

  return got_some_input;
}

/* Given a list (FUNCTION ARGS...), apply FUNCTION to the ARGS.  */

static Lisp_Object
read_process_output_call (fun_and_args)
     Lisp_Object fun_and_args;
{
  return apply1 (XCAR (fun_and_args), XCDR (fun_and_args));
}

static Lisp_Object
read_process_output_error_handler (error)
     Lisp_Object error;
{
  cmd_error_internal (error, "error in process filter: ");
  Vinhibit_quit = Qt;
  update_echo_area ();
  Fsleep_for (make_number (2), Qnil);
  return Qt;
}

/* Read pending output from the process channel,
   starting with our buffered-ahead character if we have one.
   Yield number of decoded characters read.

   This function reads at most 1024 characters.
   If you want to read all available subprocess output,
   you must call it repeatedly until it returns zero.

   The characters read are decoded according to PROC's coding-system
   for decoding.  */

int
read_process_output (proc, channel)
     Lisp_Object proc;
     register int channel;
{
  register int nbytes;
  char *chars;
  register Lisp_Object outstream;
  register struct buffer *old = current_buffer;
  register struct Lisp_Process *p = XPROCESS (proc);
  register int opoint;
  struct coding_system *coding = proc_decode_coding_system[channel];
  int carryover = XINT (p->decoding_carryover);
  int readmax = 1024;

#ifdef VMS
  VMS_PROC_STUFF *vs, *get_vms_process_pointer();

  vs = get_vms_process_pointer (p->pid);
  if (vs)
    {
      if (!vs->iosb[0])
	return (0);		/* Really weird if it does this */
      if (!(vs->iosb[0] & 1))
	return -1;		/* I/O error */
    }
  else
    error ("Could not get VMS process pointer");
  chars = vs->inputBuffer;
  nbytes = clean_vms_buffer (chars, vs->iosb[1]);
  if (nbytes <= 0)
    {
      start_vms_process_read (vs); /* Crank up the next read on the process */
      return 1;			/* Nothing worth printing, say we got 1 */
    }
  if (carryover > 0)
    {
      /* The data carried over in the previous decoding (which are at
         the tail of decoding buffer) should be prepended to the new
         data read to decode all together.  */
      chars = (char *) alloca (nbytes + carryover);
      bcopy (SDATA (p->decoding_buf), buf, carryover);
      bcopy (vs->inputBuffer, chars + carryover, nbytes);
    }
#else /* not VMS */

#ifdef DATAGRAM_SOCKETS
  /* A datagram is one packet; allow at least 1500+ bytes of data
     corresponding to the typical Ethernet frame size.  */
  if (DATAGRAM_CHAN_P (channel))
    {
      /* carryover = 0; */  /* Does carryover make sense for datagrams? */
      readmax += 1024;
    }
#endif

  chars = (char *) alloca (carryover + readmax);
  if (carryover)
    /* See the comment above.  */
    bcopy (SDATA (p->decoding_buf), chars, carryover);

#ifdef DATAGRAM_SOCKETS
  /* We have a working select, so proc_buffered_char is always -1.  */
  if (DATAGRAM_CHAN_P (channel))
    {
      int len = datagram_address[channel].len;
      nbytes = recvfrom (channel, chars + carryover, readmax - carryover,
			 0, datagram_address[channel].sa, &len);
    }
  else
#endif
  if (proc_buffered_char[channel] < 0)
    nbytes = emacs_read (channel, chars + carryover, readmax - carryover);
  else
    {
      chars[carryover] = proc_buffered_char[channel];
      proc_buffered_char[channel] = -1;
      nbytes = emacs_read (channel, chars + carryover + 1,  readmax - 1 - carryover);
      if (nbytes < 0)
	nbytes = 1;
      else
	nbytes = nbytes + 1;
    }
#endif /* not VMS */

  XSETINT (p->decoding_carryover, 0);

  /* At this point, NBYTES holds number of bytes just received
     (including the one in proc_buffered_char[channel]).  */
  if (nbytes <= 0)
    {
      if (nbytes < 0 || coding->mode & CODING_MODE_LAST_BLOCK)
	return nbytes;
      coding->mode |= CODING_MODE_LAST_BLOCK;
    }

  /* Now set NBYTES how many bytes we must decode.  */
  nbytes += carryover;

  /* Read and dispose of the process output.  */
  outstream = p->filter;
  if (!NILP (outstream))
    {
      /* We inhibit quit here instead of just catching it so that
	 hitting ^G when a filter happens to be running won't screw
	 it up.  */
      int count = SPECPDL_INDEX ();
      Lisp_Object odeactivate;
      Lisp_Object obuffer, okeymap;
      Lisp_Object text;
      int outer_running_asynch_code = running_asynch_code;
      int waiting = waiting_for_user_input_p;

      /* No need to gcpro these, because all we do with them later
	 is test them for EQness, and none of them should be a string.  */
      odeactivate = Vdeactivate_mark;
      XSETBUFFER (obuffer, current_buffer);
      okeymap = current_buffer->keymap;

      specbind (Qinhibit_quit, Qt);
      specbind (Qlast_nonmenu_event, Qt);

      /* In case we get recursively called,
	 and we already saved the match data nonrecursively,
	 save the same match data in safely recursive fashion.  */
      if (outer_running_asynch_code)
	{
	  Lisp_Object tem;
	  /* Don't clobber the CURRENT match data, either!  */
	  tem = Fmatch_data (Qnil, Qnil);
	  restore_match_data ();
	  record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil));
	  Fset_match_data (tem);
	}

      /* For speed, if a search happens within this code,
	 save the match data in a special nonrecursive fashion.  */
      running_asynch_code = 1;

      decode_coding_c_string (coding, chars, nbytes, Qt);
      text = coding->dst_object;
      Vlast_coding_system_used = CODING_ID_NAME (coding->id);
      /* A new coding system might be found.  */
      if (!EQ (p->decode_coding_system, Vlast_coding_system_used))
	{
	  p->decode_coding_system = Vlast_coding_system_used;

	  /* Don't call setup_coding_system for
	     proc_decode_coding_system[channel] here.  It is done in
	     detect_coding called via decode_coding above.  */

	  /* If a coding system for encoding is not yet decided, we set
	     it as the same as coding-system for decoding.

	     But, before doing that we must check if
	     proc_encode_coding_system[p->outfd] surely points to a
	     valid memory because p->outfd will be changed once EOF is
	     sent to the process.  */
	  if (NILP (p->encode_coding_system)
	      && proc_encode_coding_system[XINT (p->outfd)])
	    {
	      p->encode_coding_system = Vlast_coding_system_used;
	      setup_coding_system (p->encode_coding_system,
				   proc_encode_coding_system[XINT (p->outfd)]);
	    }
	}

      if (coding->carryover_bytes > 0)
	{
	  bcopy (coding->carryover, SDATA (p->decoding_buf),
		 coding->carryover_bytes);
	  XSETINT (p->decoding_carryover, coding->carryover_bytes);
	}
      /* Adjust the multibyteness of TEXT to that of the filter.  */
      if (NILP (p->filter_multibyte) != ! STRING_MULTIBYTE (text))
	text = (STRING_MULTIBYTE (text)
		? Fstring_as_unibyte (text)
		: Fstring_to_multibyte (text));
      if (SBYTES (text) > 0)
	internal_condition_case_1 (read_process_output_call,
				   Fcons (outstream,
					  Fcons (proc, Fcons (text, Qnil))),
				   !NILP (Vdebug_on_error) ? Qnil : Qerror,
				   read_process_output_error_handler);

      /* If we saved the match data nonrecursively, restore it now.  */
      restore_match_data ();
      running_asynch_code = outer_running_asynch_code;

      /* Handling the process output should not deactivate the mark.  */
      Vdeactivate_mark = odeactivate;

      /* Restore waiting_for_user_input_p as it was
	 when we were called, in case the filter clobbered it.  */
      waiting_for_user_input_p = waiting;

#if 0 /* Call record_asynch_buffer_change unconditionally,
	 because we might have changed minor modes or other things
	 that affect key bindings.  */
      if (! EQ (Fcurrent_buffer (), obuffer)
	  || ! EQ (current_buffer->keymap, okeymap))
#endif
	/* But do it only if the caller is actually going to read events.
	   Otherwise there's no need to make him wake up, and it could
	   cause trouble (for example it would make Fsit_for return).  */
	if (waiting_for_user_input_p == -1)
	  record_asynch_buffer_change ();

#ifdef VMS
      start_vms_process_read (vs);
#endif
      unbind_to (count, Qnil);
      return nbytes;
    }

  /* If no filter, write into buffer if it isn't dead.  */
  if (!NILP (p->buffer) && !NILP (XBUFFER (p->buffer)->name))
    {
      Lisp_Object old_read_only;
      int old_begv, old_zv;
      int old_begv_byte, old_zv_byte;
      Lisp_Object odeactivate;
      int before, before_byte;
      int opoint_byte;
      Lisp_Object text;
      struct buffer *b;

      odeactivate = Vdeactivate_mark;

      Fset_buffer (p->buffer);
      opoint = PT;
      opoint_byte = PT_BYTE;
      old_read_only = current_buffer->read_only;
      old_begv = BEGV;
      old_zv = ZV;
      old_begv_byte = BEGV_BYTE;
      old_zv_byte = ZV_BYTE;

      current_buffer->read_only = Qnil;

      /* Insert new output into buffer
	 at the current end-of-output marker,
	 thus preserving logical ordering of input and output.  */
      if (XMARKER (p->mark)->buffer)
	SET_PT_BOTH (clip_to_bounds (BEGV, marker_position (p->mark), ZV),
		     clip_to_bounds (BEGV_BYTE, marker_byte_position (p->mark),
				     ZV_BYTE));
      else
	SET_PT_BOTH (ZV, ZV_BYTE);
      before = PT;
      before_byte = PT_BYTE;

      /* If the output marker is outside of the visible region, save
	 the restriction and widen.  */
      if (! (BEGV <= PT && PT <= ZV))
	Fwiden ();

      decode_coding_c_string (coding, chars, nbytes, Qt);
      text = coding->dst_object;
      Vlast_coding_system_used = CODING_ID_NAME (coding->id);
      /* A new coding system might be found.  See the comment in the
	 similar code in the previous `if' block.  */
      if (!EQ (p->decode_coding_system, Vlast_coding_system_used))
	{
	  p->decode_coding_system = Vlast_coding_system_used;
	  if (NILP (p->encode_coding_system)
	      && proc_encode_coding_system[XINT (p->outfd)])
	    {
	      p->encode_coding_system = Vlast_coding_system_used;
	      setup_coding_system (p->encode_coding_system,
				   proc_encode_coding_system[XINT (p->outfd)]);
	    }
	}
      if (coding->carryover_bytes > 0)
	{
	  bcopy (coding->carryover, SDATA (p->decoding_buf),
		 coding->carryover_bytes);
	  XSETINT (p->decoding_carryover, coding->carryover_bytes);
	}
      /* Adjust the multibyteness of TEXT to that of the buffer.  */
      if (NILP (current_buffer->enable_multibyte_characters)
	  != ! STRING_MULTIBYTE (text))
	text = (STRING_MULTIBYTE (text)
		? Fstring_as_unibyte (text)
		: Fstring_to_multibyte (text));
      /* Insert before markers in case we are inserting where
	 the buffer's mark is, and the user's next command is Meta-y.  */
      insert_from_string_before_markers (text, 0, 0,
					 SCHARS (text), SBYTES (text), 0);

      /* Make sure the process marker's position is valid when the
	 process buffer is changed in the signal_after_change above.
	 W3 is known to do that.  */
      if (BUFFERP (p->buffer)
	  && (b = XBUFFER (p->buffer), b != current_buffer))
	set_marker_both (p->mark, p->buffer, BUF_PT (b), BUF_PT_BYTE (b));
      else
	set_marker_both (p->mark, p->buffer, PT, PT_BYTE);

      update_mode_lines++;

      /* Make sure opoint and the old restrictions
	 float ahead of any new text just as point would.  */
      if (opoint >= before)
	{
	  opoint += PT - before;
	  opoint_byte += PT_BYTE - before_byte;
	}
      if (old_begv > before)
	{
	  old_begv += PT - before;
	  old_begv_byte += PT_BYTE - before_byte;
	}
      if (old_zv >= before)
	{
	  old_zv += PT - before;
	  old_zv_byte += PT_BYTE - before_byte;
	}

      /* If the restriction isn't what it should be, set it.  */
      if (old_begv != BEGV || old_zv != ZV)
	Fnarrow_to_region (make_number (old_begv), make_number (old_zv));

      /* Handling the process output should not deactivate the mark.  */
      Vdeactivate_mark = odeactivate;

      current_buffer->read_only = old_read_only;
      SET_PT_BOTH (opoint, opoint_byte);
      set_buffer_internal (old);
    }
#ifdef VMS
  start_vms_process_read (vs);
#endif
  return nbytes;
}

DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p, Swaiting_for_user_input_p,
       0, 0, 0,
       doc: /* Returns non-nil if emacs is waiting for input from the user.
This is intended for use by asynchronous process output filters and sentinels.  */)
     ()
{
  return (waiting_for_user_input_p ? Qt : Qnil);
}

/* Sending data to subprocess */

jmp_buf send_process_frame;
Lisp_Object process_sent_to;

SIGTYPE
send_process_trap ()
{
#ifdef BSD4_1
  sigrelse (SIGPIPE);
  sigrelse (SIGALRM);
#endif /* BSD4_1 */
  longjmp (send_process_frame, 1);
}

/* Send some data to process PROC.
   BUF is the beginning of the data; LEN is the number of characters.
   OBJECT is the Lisp object that the data comes from.  If OBJECT is
   nil or t, it means that the data comes from C string.

   If OBJECT is not nil, the data is encoded by PROC's coding-system
   for encoding before it is sent.

   This function can evaluate Lisp code and can garbage collect.  */

void
send_process (proc, buf, len, object)
     volatile Lisp_Object proc;
     unsigned char *volatile buf;
     volatile int len;
     volatile Lisp_Object object;
{
  /* Use volatile to protect variables from being clobbered by longjmp.  */
  int rv;
  struct coding_system *coding;
  struct gcpro gcpro1;

  GCPRO1 (object);

#ifdef VMS
  struct Lisp_Process *p = XPROCESS (proc);
  VMS_PROC_STUFF *vs, *get_vms_process_pointer();
#endif /* VMS */

  if (! NILP (XPROCESS (proc)->raw_status_low))
    update_status (XPROCESS (proc));
  if (! EQ (XPROCESS (proc)->status, Qrun))
    error ("Process %s not running",
	   SDATA (XPROCESS (proc)->name));
  if (XINT (XPROCESS (proc)->outfd) < 0)
    error ("Output file descriptor of %s is closed",
	   SDATA (XPROCESS (proc)->name));

  coding = proc_encode_coding_system[XINT (XPROCESS (proc)->outfd)];
  Vlast_coding_system_used = CODING_ID_NAME (coding->id);

  if ((STRINGP (object) && STRING_MULTIBYTE (object))
      || (BUFFERP (object)
	  && !NILP (XBUFFER (object)->enable_multibyte_characters))
      || EQ (object, Qt))
    {
      if (!EQ (Vlast_coding_system_used,
	       XPROCESS (proc)->encode_coding_system))
	/* The coding system for encoding was changed to raw-text
	   because we sent a unibyte text previously.  Now we are
	   sending a multibyte text, thus we must encode it by the
	   original coding system specified for the current
	   process.  */
	setup_coding_system (XPROCESS (proc)->encode_coding_system, coding);
      coding->src_multibyte = 1;
    }
  else
    {
      /* For sending a unibyte text, character code conversion should
	 not take place but EOL conversion should.  So, setup raw-text
	 or one of the subsidiary if we have not yet done it.  */
      if (CODING_REQUIRE_ENCODING (coding))
	{
	  if (CODING_REQUIRE_FLUSHING (coding))
	    {
	      /* But, before changing the coding, we must flush out data.  */
	      coding->mode |= CODING_MODE_LAST_BLOCK;
	      send_process (proc, "", 0, Qt);
	      coding->mode &= CODING_MODE_LAST_BLOCK;
	    }
	  setup_coding_system (raw_text_coding_system
			       (Vlast_coding_system_used),
			       coding);
	  coding->src_multibyte = 0;
	}
    }
  coding->dst_multibyte = 0;

  if (CODING_REQUIRE_ENCODING (coding))
    {
      coding->dst_object = Qt;
      if (BUFFERP (object))
	{
	  int from_byte, from, to;
	  int save_pt, save_pt_byte;
	  struct buffer *cur = current_buffer;

	  set_buffer_internal (XBUFFER (object));
	  save_pt = PT, save_pt_byte = PT_BYTE;

	  from_byte = PTR_BYTE_POS (buf);
	  from = BYTE_TO_CHAR (from_byte);
	  to = BYTE_TO_CHAR (from_byte + len);
	  TEMP_SET_PT_BOTH (from, from_byte);
	  encode_coding_object (coding, object, from, from_byte,
				to, from_byte + len, Qt);
	  TEMP_SET_PT_BOTH (save_pt, save_pt_byte);
	  set_buffer_internal (cur);
	}
      else if (STRINGP (object))
	{
	  encode_coding_string (coding, object, 1);
	}
      else
	{
	  coding->dst_object = make_unibyte_string (buf, len);
	  coding->produced = len;
	}

      len = coding->produced;
      buf = SDATA (coding->dst_object);
    }

#ifdef VMS
  vs = get_vms_process_pointer (p->pid);
  if (vs == 0)
    error ("Could not find this process: %x", p->pid);
  else if (write_to_vms_process (vs, buf, len))
    ;
#else /* not VMS */

  if (pty_max_bytes == 0)
    {
#if defined (HAVE_FPATHCONF) && defined (_PC_MAX_CANON)
      pty_max_bytes = fpathconf (XFASTINT (XPROCESS (proc)->outfd),
				 _PC_MAX_CANON);
      if (pty_max_bytes < 0)
	pty_max_bytes = 250;
#else
      pty_max_bytes = 250;
#endif
      /* Deduct one, to leave space for the eof.  */
      pty_max_bytes--;
    }

  /* 2000-09-21: Emacs 20.7, sparc-sun-solaris-2.6, GCC 2.95.2,
     CFLAGS="-g -O": The value of the parameter `proc' is clobbered
     when returning with longjmp despite being declared volatile.  */
  if (!setjmp (send_process_frame))
    {
      process_sent_to = proc;
      while (len > 0)
	{
	  int this = len;
	  SIGTYPE (*old_sigpipe)();

	  /* Decide how much data we can send in one batch.
	     Long lines need to be split into multiple batches.  */
	  if (!NILP (XPROCESS (proc)->pty_flag))
	    {
	      /* Starting this at zero is always correct when not the first
                 iteration because the previous iteration ended by sending C-d.
		 It may not be correct for the first iteration
		 if a partial line was sent in a separate send_process call.
		 If that proves worth handling, we need to save linepos
		 in the process object.  */
	      int linepos = 0;
	      unsigned char *ptr = (unsigned char *) buf;
	      unsigned char *end = (unsigned char *) buf + len;

	      /* Scan through this text for a line that is too long.  */
	      while (ptr != end && linepos < pty_max_bytes)
		{
		  if (*ptr == '\n')
		    linepos = 0;
		  else
		    linepos++;
		  ptr++;
		}
	      /* If we found one, break the line there
		 and put in a C-d to force the buffer through.  */
	      this = ptr - buf;
	    }

	  /* Send this batch, using one or more write calls.  */
	  while (this > 0)
	    {
	      int outfd = XINT (XPROCESS (proc)->outfd);
	      old_sigpipe = (SIGTYPE (*) ()) signal (SIGPIPE, send_process_trap);
#ifdef DATAGRAM_SOCKETS
	      if (DATAGRAM_CHAN_P (outfd))
		{
		  rv = sendto (outfd, (char *) buf, this,
			       0, datagram_address[outfd].sa,
			       datagram_address[outfd].len);
		  if (rv < 0 && errno == EMSGSIZE)
		    report_file_error ("sending datagram", Fcons (proc, Qnil));
		}
	      else
#endif
		rv = emacs_write (outfd, (char *) buf, this);
	      signal (SIGPIPE, old_sigpipe);

	      if (rv < 0)
		{
		  if (0
#ifdef EWOULDBLOCK
		      || errno == EWOULDBLOCK
#endif
#ifdef EAGAIN
		      || errno == EAGAIN
#endif
		      )
		    /* Buffer is full.  Wait, accepting input;
		       that may allow the program
		       to finish doing output and read more.  */
		    {
		      Lisp_Object zero;
		      int offset = 0;

#ifdef BROKEN_PTY_READ_AFTER_EAGAIN
		      /* A gross hack to work around a bug in FreeBSD.
			 In the following sequence, read(2) returns
			 bogus data:

			 write(2)	 1022 bytes
			 write(2)   954 bytes, get EAGAIN
			 read(2)   1024 bytes in process_read_output
			 read(2)     11 bytes in process_read_output

			 That is, read(2) returns more bytes than have
			 ever been written successfully.  The 1033 bytes
			 read are the 1022 bytes written successfully
			 after processing (for example with CRs added if
			 the terminal is set up that way which it is
			 here).  The same bytes will be seen again in a
			 later read(2), without the CRs.  */

		      if (errno == EAGAIN)
			{
			  int flags = FWRITE;
			  ioctl (XINT (XPROCESS (proc)->outfd), TIOCFLUSH,
				 &flags);
			}
#endif /* BROKEN_PTY_READ_AFTER_EAGAIN */

		      /* Running filters might relocate buffers or strings.
			 Arrange to relocate BUF.  */
		      if (BUFFERP (object))
			offset = BUF_PTR_BYTE_POS (XBUFFER (object), buf);
		      else if (STRINGP (object))
			offset = buf - SDATA (object);

		      XSETFASTINT (zero, 0);
#ifdef EMACS_HAS_USECS
		      wait_reading_process_input (0, 20000, zero, 0);
#else
		      wait_reading_process_input (1, 0, zero, 0);
#endif

		      if (BUFFERP (object))
			buf = BUF_BYTE_ADDRESS (XBUFFER (object), offset);
		      else if (STRINGP (object))
			buf = offset + SDATA (object);

		      rv = 0;
		    }
		  else
		    /* This is a real error.  */
		    report_file_error ("writing to process", Fcons (proc, Qnil));
		}
	      buf += rv;
	      len -= rv;
	      this -= rv;
	    }

	  /* If we sent just part of the string, put in an EOF
	     to force it through, before we send the rest.  */
	  if (len > 0)
	    Fprocess_send_eof (proc);
	}
    }
#endif /* not VMS */
  else
    {
#ifndef VMS
      proc = process_sent_to;
#endif
      XPROCESS (proc)->raw_status_low = Qnil;
      XPROCESS (proc)->raw_status_high = Qnil;
      XPROCESS (proc)->status = Fcons (Qexit, Fcons (make_number (256), Qnil));
      XSETINT (XPROCESS (proc)->tick, ++process_tick);
      deactivate_process (proc);
#ifdef VMS
      error ("Error writing to process %s; closed it",
	     SDATA (XPROCESS (proc)->name));
#else
      error ("SIGPIPE raised on process %s; closed it",
	     SDATA (XPROCESS (proc)->name));
#endif
    }

  UNGCPRO;
}

DEFUN ("process-send-region", Fprocess_send_region, Sprocess_send_region,
       3, 3, 0,
       doc: /* Send current contents of region as input to PROCESS.
PROCESS may be a process, a buffer, the name of a process or buffer, or
nil, indicating the current buffer's process.
Called from program, takes three arguments, PROCESS, START and END.
If the region is more than 500 characters long,
it is sent in several bunches.  This may happen even for shorter regions.
Output from processes can arrive in between bunches.  */)
     (process, start, end)
     Lisp_Object process, start, end;
{
  Lisp_Object proc;
  int start1, end1;

  proc = get_process (process);
  validate_region (&start, &end);

  if (XINT (start) < GPT && XINT (end) > GPT)
    move_gap (XINT (start));

  start1 = CHAR_TO_BYTE (XINT (start));
  end1 = CHAR_TO_BYTE (XINT (end));
  send_process (proc, BYTE_POS_ADDR (start1), end1 - start1,
		Fcurrent_buffer ());

  return Qnil;
}

DEFUN ("process-send-string", Fprocess_send_string, Sprocess_send_string,
       2, 2, 0,
       doc: /* Send PROCESS the contents of STRING as input.
PROCESS may be a process, a buffer, the name of a process or buffer, or
nil, indicating the current buffer's process.
If STRING is more than 500 characters long,
it is sent in several bunches.  This may happen even for shorter strings.
Output from processes can arrive in between bunches.  */)
     (process, string)
     Lisp_Object process, string;
{
  Lisp_Object proc;
  CHECK_STRING (string);
  proc = get_process (process);
  send_process (proc, SDATA (string),
		SBYTES (string), string);
  return Qnil;
}

/* Return the foreground process group for the tty/pty that
   the process P uses.  */
static int
emacs_get_tty_pgrp (p)
     struct Lisp_Process *p;
{
  int gid = -1;

#ifdef TIOCGPGRP 
  if (ioctl (XINT (p->infd), TIOCGPGRP, &gid) == -1 && ! NILP (p->tty_name))
    {
      int fd;
      /* Some OS:es (Solaris 8/9) does not allow TIOCGPGRP from the
	 master side.  Try the slave side.  */
      fd = emacs_open (XSTRING (p->tty_name)->data, O_RDONLY, 0);

      if (fd != -1)
	{
	  ioctl (fd, TIOCGPGRP, &gid);
	  emacs_close (fd);
	}
    }
#endif /* defined (TIOCGPGRP ) */

  return gid;
}

DEFUN ("process-running-child-p", Fprocess_running_child_p,
       Sprocess_running_child_p, 0, 1, 0,
       doc: /* Return t if PROCESS has given the terminal to a child.
If the operating system does not make it possible to find out,
return t unconditionally.  */)
     (process)
     Lisp_Object process;
{
  /* Initialize in case ioctl doesn't exist or gives an error,
     in a way that will cause returning t.  */
  int gid;
  Lisp_Object proc;
  struct Lisp_Process *p;

  proc = get_process (process);
  p = XPROCESS (proc);

  if (!EQ (p->childp, Qt))
    error ("Process %s is not a subprocess",
	   SDATA (p->name));
  if (XINT (p->infd) < 0)
    error ("Process %s is not active",
	   SDATA (p->name));

  gid = emacs_get_tty_pgrp (p);

  if (gid == XFASTINT (p->pid))
    return Qnil;
  return Qt;
}

/* send a signal number SIGNO to PROCESS.
   If CURRENT_GROUP is t, that means send to the process group
   that currently owns the terminal being used to communicate with PROCESS.
   This is used for various commands in shell mode.
   If CURRENT_GROUP is lambda, that means send to the process group
   that currently owns the terminal, but only if it is NOT the shell itself.

   If NOMSG is zero, insert signal-announcements into process's buffers
   right away.

   If we can, we try to signal PROCESS by sending control characters
   down the pty.  This allows us to signal inferiors who have changed
   their uid, for which killpg would return an EPERM error.  */

static void
process_send_signal (process, signo, current_group, nomsg)
     Lisp_Object process;
     int signo;
     Lisp_Object current_group;
     int nomsg;
{
  Lisp_Object proc;
  register struct Lisp_Process *p;
  int gid;
  int no_pgrp = 0;

  proc = get_process (process);
  p = XPROCESS (proc);

  if (!EQ (p->childp, Qt))
    error ("Process %s is not a subprocess",
	   SDATA (p->name));
  if (XINT (p->infd) < 0)
    error ("Process %s is not active",
	   SDATA (p->name));

  if (NILP (p->pty_flag))
    current_group = Qnil;

  /* If we are using pgrps, get a pgrp number and make it negative.  */
  if (NILP (current_group))
    /* Send the signal to the shell's process group.  */
    gid = XFASTINT (p->pid);
  else
    {
#ifdef SIGNALS_VIA_CHARACTERS
      /* If possible, send signals to the entire pgrp
	 by sending an input character to it.  */

      /* TERMIOS is the latest and bestest, and seems most likely to
         work.  If the system has it, use it.  */
#ifdef HAVE_TERMIOS
      struct termios t;

      switch (signo)
	{
	case SIGINT:
	  tcgetattr (XINT (p->infd), &t);
	  send_process (proc, &t.c_cc[VINTR], 1, Qnil);
	  return;

	case SIGQUIT:
	  tcgetattr (XINT (p->infd), &t);
  	  send_process (proc, &t.c_cc[VQUIT], 1, Qnil);
  	  return;

  	case SIGTSTP:
	  tcgetattr (XINT (p->infd), &t);
#if defined (VSWTCH) && !defined (PREFER_VSUSP)
  	  send_process (proc, &t.c_cc[VSWTCH], 1, Qnil);
#else
	  send_process (proc, &t.c_cc[VSUSP], 1, Qnil);
#endif
  	  return;
	}

#else /* ! HAVE_TERMIOS */

      /* On Berkeley descendants, the following IOCTL's retrieve the
	 current control characters.  */
#if defined (TIOCGLTC) && defined (TIOCGETC)

      struct tchars c;
      struct ltchars lc;

      switch (signo)
	{
	case SIGINT:
	  ioctl (XINT (p->infd), TIOCGETC, &c);
	  send_process (proc, &c.t_intrc, 1, Qnil);
	  return;
	case SIGQUIT:
	  ioctl (XINT (p->infd), TIOCGETC, &c);
	  send_process (proc, &c.t_quitc, 1, Qnil);
	  return;
#ifdef SIGTSTP
	case SIGTSTP:
	  ioctl (XINT (p->infd), TIOCGLTC, &lc);
	  send_process (proc, &lc.t_suspc, 1, Qnil);
	  return;
#endif /* ! defined (SIGTSTP) */
	}

#else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */

      /* On SYSV descendants, the TCGETA ioctl retrieves the current control
	 characters.  */
#ifdef TCGETA
      struct termio t;
      switch (signo)
	{
	case SIGINT:
	  ioctl (XINT (p->infd), TCGETA, &t);
	  send_process (proc, &t.c_cc[VINTR], 1, Qnil);
	  return;
	case SIGQUIT:
	  ioctl (XINT (p->infd), TCGETA, &t);
	  send_process (proc, &t.c_cc[VQUIT], 1, Qnil);
	  return;
#ifdef SIGTSTP
	case SIGTSTP:
	  ioctl (XINT (p->infd), TCGETA, &t);
	  send_process (proc, &t.c_cc[VSWTCH], 1, Qnil);
	  return;
#endif /* ! defined (SIGTSTP) */
	}
#else /* ! defined (TCGETA) */
      Your configuration files are messed up.
      /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
	 you'd better be using one of the alternatives above!  */
#endif /* ! defined (TCGETA) */
#endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
#endif /* ! defined HAVE_TERMIOS */
	abort ();
      /* The code above always returns from the function.  */
#endif /* defined (SIGNALS_VIA_CHARACTERS) */

#ifdef TIOCGPGRP
      /* Get the current pgrp using the tty itself, if we have that.
	 Otherwise, use the pty to get the pgrp.
	 On pfa systems, saka@pfu.fujitsu.co.JP writes:
	 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
	 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
	 His patch indicates that if TIOCGPGRP returns an error, then
	 we should just assume that p->pid is also the process group id.  */

      gid = emacs_get_tty_pgrp (p);
	
      if (gid == -1)
	/* If we can't get the information, assume
	   the shell owns the tty.  */
	gid = XFASTINT (p->pid);

      /* It is not clear whether anything really can set GID to -1.
	 Perhaps on some system one of those ioctls can or could do so.
	 Or perhaps this is vestigial.  */
      if (gid == -1)
	no_pgrp = 1;
#else  /* ! defined (TIOCGPGRP ) */
      /* Can't select pgrps on this system, so we know that
	 the child itself heads the pgrp.  */
      gid = XFASTINT (p->pid);
#endif /* ! defined (TIOCGPGRP ) */

      /* If current_group is lambda, and the shell owns the terminal,
	 don't send any signal.  */
      if (EQ (current_group, Qlambda) && gid == XFASTINT (p->pid))
	return;
    }

  switch (signo)
    {
#ifdef SIGCONT
    case SIGCONT:
      p->raw_status_low = Qnil;
      p->raw_status_high = Qnil;
      p->status = Qrun;
      XSETINT (p->tick, ++process_tick);
      if (!nomsg)
	status_notify ();
      break;
#endif /* ! defined (SIGCONT) */
    case SIGINT:
#ifdef VMS
      send_process (proc, "\003", 1, Qnil);	/* ^C */
      goto whoosh;
#endif
    case SIGQUIT:
#ifdef VMS
      send_process (proc, "\031", 1, Qnil);	/* ^Y */
      goto whoosh;
#endif
    case SIGKILL:
#ifdef VMS
      sys$forcex (&(XFASTINT (p->pid)), 0, 1);
      whoosh:
#endif
      flush_pending_output (XINT (p->infd));
      break;
    }

  /* If we don't have process groups, send the signal to the immediate
     subprocess.  That isn't really right, but it's better than any
     obvious alternative.  */
  if (no_pgrp)
    {
      kill (XFASTINT (p->pid), signo);
      return;
    }

  /* gid may be a pid, or minus a pgrp's number */
#ifdef TIOCSIGSEND
  if (!NILP (current_group))
    {
      if (ioctl (XINT (p->infd), TIOCSIGSEND, signo) == -1)
	EMACS_KILLPG (gid, signo);
    }
  else
    {
      gid = - XFASTINT (p->pid);
      kill (gid, signo);
    }
#else /* ! defined (TIOCSIGSEND) */
  EMACS_KILLPG (gid, signo);
#endif /* ! defined (TIOCSIGSEND) */
}

DEFUN ("interrupt-process", Finterrupt_process, Sinterrupt_process, 0, 2, 0,
       doc: /* Interrupt process PROCESS.
PROCESS may be a process, a buffer, or the name of a process or buffer.
nil or no arg means current buffer's process.
Second arg CURRENT-GROUP non-nil means send signal to
the current process-group of the process's controlling terminal
rather than to the process's own process group.
If the process is a shell, this means interrupt current subjob
rather than the shell.

If CURRENT-GROUP is `lambda', and if the shell owns the terminal,
don't send the signal.  */)
     (process, current_group)
     Lisp_Object process, current_group;
{
  process_send_signal (process, SIGINT, current_group, 0);
  return process;
}

DEFUN ("kill-process", Fkill_process, Skill_process, 0, 2, 0,
       doc: /* Kill process PROCESS.  May be process or name of one.
See function `interrupt-process' for more details on usage.  */)
     (process, current_group)
     Lisp_Object process, current_group;
{
  process_send_signal (process, SIGKILL, current_group, 0);
  return process;
}

DEFUN ("quit-process", Fquit_process, Squit_process, 0, 2, 0,
       doc: /* Send QUIT signal to process PROCESS.  May be process or name of one.
See function `interrupt-process' for more details on usage.  */)
     (process, current_group)
     Lisp_Object process, current_group;
{
  process_send_signal (process, SIGQUIT, current_group, 0);
  return process;
}

DEFUN ("stop-process", Fstop_process, Sstop_process, 0, 2, 0,
       doc: /* Stop process PROCESS.  May be process or name of one.
See function `interrupt-process' for more details on usage.
If PROCESS is a network process, inhibit handling of incoming traffic.  */)
     (process, current_group)
     Lisp_Object process, current_group;
{
#ifdef HAVE_SOCKETS
  if (PROCESSP (process) && NETCONN_P (process))
    {
      struct Lisp_Process *p;

      p = XPROCESS (process);
      if (NILP (p->command)
	  && XINT (p->infd) >= 0)
	{
	  FD_CLR (XINT (p->infd), &input_wait_mask);
	  FD_CLR (XINT (p->infd), &non_keyboard_wait_mask);
	}
      p->command = Qt;
      return process;
    }
#endif
#ifndef SIGTSTP
  error ("no SIGTSTP support");
#else
  process_send_signal (process, SIGTSTP, current_group, 0);
#endif
  return process;
}

DEFUN ("continue-process", Fcontinue_process, Scontinue_process, 0, 2, 0,
       doc: /* Continue process PROCESS.  May be process or name of one.
See function `interrupt-process' for more details on usage.
If PROCESS is a network process, resume handling of incoming traffic.  */)
     (process, current_group)
     Lisp_Object process, current_group;
{
#ifdef HAVE_SOCKETS
  if (PROCESSP (process) && NETCONN_P (process))
    {
      struct Lisp_Process *p;

      p = XPROCESS (process);
      if (EQ (p->command, Qt)
	  && XINT (p->infd) >= 0
	  && (!EQ (p->filter, Qt) || EQ (p->status, Qlisten)))
	{
	  FD_SET (XINT (p->infd), &input_wait_mask);
	  FD_SET (XINT (p->infd), &non_keyboard_wait_mask);
	}
      p->command = Qnil;
      return process;
    }
#endif
#ifdef SIGCONT
    process_send_signal (process, SIGCONT, current_group, 0);
#else
    error ("no SIGCONT support");
#endif
  return process;
}

DEFUN ("signal-process", Fsignal_process, Ssignal_process,
       2, 2, "sProcess (name or number): \nnSignal code: ",
       doc: /* Send PROCESS the signal with code SIGCODE.
PROCESS may also be an integer specifying the process id of the
process to signal; in this case, the process need not be a child of
this Emacs.
SIGCODE may be an integer, or a symbol whose name is a signal name.  */)
     (process, sigcode)
     Lisp_Object process, sigcode;
{
  Lisp_Object pid;

  if (INTEGERP (process))
    {
      pid = process;
      goto got_it;
    }

  if (STRINGP (process))
    {
      Lisp_Object tem;
      if (tem = Fget_process (process), NILP (tem))
	{
	  pid = Fstring_to_number (process, make_number (10));
	  if (XINT (pid) != 0)
	    goto got_it;
	}
      process = tem;
    }
  else
    process = get_process (process);

  if (NILP (process))
    return process;

  CHECK_PROCESS (process);
  pid = XPROCESS (process)->pid;
  if (!INTEGERP (pid) || XINT (pid) <= 0)
    error ("Cannot signal process %s", SDATA (XPROCESS (process)->name));

 got_it:

#define handle_signal(NAME, VALUE)		\
  else if (!strcmp (name, NAME))		\
    XSETINT (sigcode, VALUE)

  if (INTEGERP (sigcode))
    ;
  else
    {
      unsigned char *name;

      CHECK_SYMBOL (sigcode);
      name = SDATA (SYMBOL_NAME (sigcode));

      if (0)
	;
#ifdef SIGHUP
      handle_signal ("SIGHUP", SIGHUP);
#endif
#ifdef SIGINT
      handle_signal ("SIGINT", SIGINT);
#endif
#ifdef SIGQUIT
      handle_signal ("SIGQUIT", SIGQUIT);
#endif
#ifdef SIGILL
      handle_signal ("SIGILL", SIGILL);
#endif
#ifdef SIGABRT
      handle_signal ("SIGABRT", SIGABRT);
#endif
#ifdef SIGEMT
      handle_signal ("SIGEMT", SIGEMT);
#endif
#ifdef SIGKILL
      handle_signal ("SIGKILL", SIGKILL);
#endif
#ifdef SIGFPE
      handle_signal ("SIGFPE", SIGFPE);
#endif
#ifdef SIGBUS
      handle_signal ("SIGBUS", SIGBUS);
#endif
#ifdef SIGSEGV
      handle_signal ("SIGSEGV", SIGSEGV);
#endif
#ifdef SIGSYS
      handle_signal ("SIGSYS", SIGSYS);
#endif
#ifdef SIGPIPE
      handle_signal ("SIGPIPE", SIGPIPE);
#endif
#ifdef SIGALRM
      handle_signal ("SIGALRM", SIGALRM);
#endif
#ifdef SIGTERM
      handle_signal ("SIGTERM", SIGTERM);
#endif
#ifdef SIGURG
      handle_signal ("SIGURG", SIGURG);
#endif
#ifdef SIGSTOP
      handle_signal ("SIGSTOP", SIGSTOP);
#endif
#ifdef SIGTSTP
      handle_signal ("SIGTSTP", SIGTSTP);
#endif
#ifdef SIGCONT
      handle_signal ("SIGCONT", SIGCONT);
#endif
#ifdef SIGCHLD
      handle_signal ("SIGCHLD", SIGCHLD);
#endif
#ifdef SIGTTIN
      handle_signal ("SIGTTIN", SIGTTIN);
#endif
#ifdef SIGTTOU
      handle_signal ("SIGTTOU", SIGTTOU);
#endif
#ifdef SIGIO
      handle_signal ("SIGIO", SIGIO);
#endif
#ifdef SIGXCPU
      handle_signal ("SIGXCPU", SIGXCPU);
#endif
#ifdef SIGXFSZ
      handle_signal ("SIGXFSZ", SIGXFSZ);
#endif
#ifdef SIGVTALRM
      handle_signal ("SIGVTALRM", SIGVTALRM);
#endif
#ifdef SIGPROF
      handle_signal ("SIGPROF", SIGPROF);
#endif
#ifdef SIGWINCH
      handle_signal ("SIGWINCH", SIGWINCH);
#endif
#ifdef SIGINFO
      handle_signal ("SIGINFO", SIGINFO);
#endif
#ifdef SIGUSR1
      handle_signal ("SIGUSR1", SIGUSR1);
#endif
#ifdef SIGUSR2
      handle_signal ("SIGUSR2", SIGUSR2);
#endif
      else
	error ("Undefined signal name %s", name);
    }

#undef handle_signal

  return make_number (kill (XINT (pid), XINT (sigcode)));
}

DEFUN ("process-send-eof", Fprocess_send_eof, Sprocess_send_eof, 0, 1, 0,
       doc: /* Make PROCESS see end-of-file in its input.
EOF comes after any text already sent to it.
PROCESS may be a process, a buffer, the name of a process or buffer, or
nil, indicating the current buffer's process.
If PROCESS is a network connection, or is a process communicating
through a pipe (as opposed to a pty), then you cannot send any more
text to PROCESS after you call this function.  */)
     (process)
     Lisp_Object process;
{
  Lisp_Object proc;
  struct coding_system *coding;

  if (DATAGRAM_CONN_P (process))
    return process;

  proc = get_process (process);
  coding = proc_encode_coding_system[XINT (XPROCESS (proc)->outfd)];

  /* Make sure the process is really alive.  */
  if (! NILP (XPROCESS (proc)->raw_status_low))
    update_status (XPROCESS (proc));
  if (! EQ (XPROCESS (proc)->status, Qrun))
    error ("Process %s not running", SDATA (XPROCESS (proc)->name));

  if (CODING_REQUIRE_FLUSHING (coding))
    {
      coding->mode |= CODING_MODE_LAST_BLOCK;
      send_process (proc, "", 0, Qnil);
    }

#ifdef VMS
  send_process (proc, "\032", 1, Qnil); 	/* ^z */
#else
  if (!NILP (XPROCESS (proc)->pty_flag))
    send_process (proc, "\004", 1, Qnil);
  else
    {
      int old_outfd, new_outfd;

#ifdef HAVE_SHUTDOWN
      /* If this is a network connection, or socketpair is used
	 for communication with the subprocess, call shutdown to cause EOF.
	 (In some old system, shutdown to socketpair doesn't work.
	 Then we just can't win.)  */
      if (NILP (XPROCESS (proc)->pid)
	  || XINT (XPROCESS (proc)->outfd) == XINT (XPROCESS (proc)->infd))
	shutdown (XINT (XPROCESS (proc)->outfd), 1);
      /* In case of socketpair, outfd == infd, so don't close it.  */
      if (XINT (XPROCESS (proc)->outfd) != XINT (XPROCESS (proc)->infd))
	emacs_close (XINT (XPROCESS (proc)->outfd));
#else /* not HAVE_SHUTDOWN */
      emacs_close (XINT (XPROCESS (proc)->outfd));
#endif /* not HAVE_SHUTDOWN */
      new_outfd = emacs_open (NULL_DEVICE, O_WRONLY, 0);
      old_outfd = XINT (XPROCESS (proc)->outfd);

      if (!proc_encode_coding_system[new_outfd])
	proc_encode_coding_system[new_outfd]
	  = (struct coding_system *) xmalloc (sizeof (struct coding_system));
      bcopy (proc_encode_coding_system[old_outfd],
	     proc_encode_coding_system[new_outfd],
	     sizeof (struct coding_system));
      bzero (proc_encode_coding_system[old_outfd],
	     sizeof (struct coding_system));

      XSETINT (XPROCESS (proc)->outfd, new_outfd);
    }
#endif /* VMS */
  return process;
}

/* Kill all processes associated with `buffer'.
   If `buffer' is nil, kill all processes  */

void
kill_buffer_processes (buffer)
     Lisp_Object buffer;
{
  Lisp_Object tail, proc;

  for (tail = Vprocess_alist; GC_CONSP (tail); tail = XCDR (tail))
    {
      proc = XCDR (XCAR (tail));
      if (GC_PROCESSP (proc)
	  && (NILP (buffer) || EQ (XPROCESS (proc)->buffer, buffer)))
	{
	  if (NETCONN_P (proc))
	    Fdelete_process (proc);
	  else if (XINT (XPROCESS (proc)->infd) >= 0)
	    process_send_signal (proc, SIGHUP, Qnil, 1);
	}
    }
}

/* On receipt of a signal that a child status has changed, loop asking
   about children with changed statuses until the system says there
   are no more.

   All we do is change the status; we do not run sentinels or print
   notifications.  That is saved for the next time keyboard input is
   done, in order to avoid timing errors.

   ** WARNING: this can be called during garbage collection.
   Therefore, it must not be fooled by the presence of mark bits in
   Lisp objects.

   ** USG WARNING: Although it is not obvious from the documentation
   in signal(2), on a USG system the SIGCLD handler MUST NOT call
   signal() before executing at least one wait(), otherwise the
   handler will be called again, resulting in an infinite loop.  The
   relevant portion of the documentation reads "SIGCLD signals will be
   queued and the signal-catching function will be continually
   reentered until the queue is empty".  Invoking signal() causes the
   kernel to reexamine the SIGCLD queue.  Fred Fish, UniSoft Systems
   Inc. */

SIGTYPE
sigchld_handler (signo)
     int signo;
{
  int old_errno = errno;
  Lisp_Object proc;
  register struct Lisp_Process *p;
  extern EMACS_TIME *input_available_clear_time;

#ifdef BSD4_1
  extern int sigheld;
  sigheld |= sigbit (SIGCHLD);
#endif

  while (1)
    {
      register int pid;
      WAITTYPE w;
      Lisp_Object tail;

#ifdef WNOHANG
#ifndef WUNTRACED
#define WUNTRACED 0
#endif /* no WUNTRACED */
      /* Keep trying to get a status until we get a definitive result.  */
      do
	{
	  errno = 0;
	  pid = wait3 (&w, WNOHANG | WUNTRACED, 0);
	}
      while (pid < 0 && errno == EINTR);

      if (pid <= 0)
	{
	  /* PID == 0 means no processes found, PID == -1 means a real
	     failure.  We have done all our job, so return.  */

	  /* USG systems forget handlers when they are used;
	     must reestablish each time */
#if defined (USG) && !defined (POSIX_SIGNALS)
	  signal (signo, sigchld_handler);   /* WARNING - must come after wait3() */
#endif
#ifdef  BSD4_1
	  sigheld &= ~sigbit (SIGCHLD);
	  sigrelse (SIGCHLD);
#endif
	  errno = old_errno;
	  return;
	}
#else
      pid = wait (&w);
#endif /* no WNOHANG */

      /* Find the process that signaled us, and record its status.  */

      p = 0;
      for (tail = Vprocess_alist; GC_CONSP (tail); tail = XCDR (tail))
	{
	  proc = XCDR (XCAR (tail));
	  p = XPROCESS (proc);
	  if (GC_EQ (p->childp, Qt) && XINT (p->pid) == pid)
	    break;
	  p = 0;
	}

      /* Look for an asynchronous process whose pid hasn't been filled
	 in yet.  */
      if (p == 0)
	for (tail = Vprocess_alist; GC_CONSP (tail); tail = XCDR (tail))
	  {
	    proc = XCDR (XCAR (tail));
	    p = XPROCESS (proc);
	    if (GC_INTEGERP (p->pid) && XINT (p->pid) == -1)
	      break;
	    p = 0;
	  }

      /* Change the status of the process that was found.  */
      if (p != 0)
	{
	  union { int i; WAITTYPE wt; } u;
	  int clear_desc_flag = 0;

	  XSETINT (p->tick, ++process_tick);
	  u.wt = w;
	  XSETINT (p->raw_status_low, u.i & 0xffff);
	  XSETINT (p->raw_status_high, u.i >> 16);

	  /* If process has terminated, stop waiting for its output.  */
	  if ((WIFSIGNALED (w) || WIFEXITED (w))
	      && XINT (p->infd) >= 0)
	    clear_desc_flag = 1;

	  /* We use clear_desc_flag to avoid a compiler bug in Microsoft C.  */
	  if (clear_desc_flag)
	    {
	      FD_CLR (XINT (p->infd), &input_wait_mask);
	      FD_CLR (XINT (p->infd), &non_keyboard_wait_mask);
	    }

	  /* Tell wait_reading_process_input that it needs to wake up and
	     look around.  */
	  if (input_available_clear_time)
	    EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0);
	}

	/* There was no asynchronous process found for that id.  Check
	   if we have a synchronous process.  */
      else
	{
	  synch_process_alive = 0;

	  /* Report the status of the synchronous process.  */
	  if (WIFEXITED (w))
	    synch_process_retcode = WRETCODE (w);
	  else if (WIFSIGNALED (w))
	    {
	      int code = WTERMSIG (w);
	      char *signame;

	      synchronize_system_messages_locale ();
	      signame = strsignal (code);

	      if (signame == 0)
		signame = "unknown";

	      synch_process_death = signame;
	    }

	  /* Tell wait_reading_process_input that it needs to wake up and
	     look around.  */
	  if (input_available_clear_time)
	    EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0);
	}

      /* On some systems, we must return right away.
	 If any more processes want to signal us, we will
	 get another signal.
	 Otherwise (on systems that have WNOHANG), loop around
	 to use up all the processes that have something to tell us.  */
#if (defined WINDOWSNT \
     || (defined USG && !defined GNU_LINUX \
         && !(defined HPUX && defined WNOHANG)))
#if defined (USG) && ! defined (POSIX_SIGNALS)
      signal (signo, sigchld_handler);
#endif
      errno = old_errno;
      return;
#endif /* USG, but not HPUX with WNOHANG */
    }
}


static Lisp_Object
exec_sentinel_unwind (data)
     Lisp_Object data;
{
  XPROCESS (XCAR (data))->sentinel = XCDR (data);
  return Qnil;
}

static Lisp_Object
exec_sentinel_error_handler (error)
     Lisp_Object error;
{
  cmd_error_internal (error, "error in process sentinel: ");
  Vinhibit_quit = Qt;
  update_echo_area ();
  Fsleep_for (make_number (2), Qnil);
  return Qt;
}

static void
exec_sentinel (proc, reason)
     Lisp_Object proc, reason;
{
  Lisp_Object sentinel, obuffer, odeactivate, okeymap;
  register struct Lisp_Process *p = XPROCESS (proc);
  int count = SPECPDL_INDEX ();
  int outer_running_asynch_code = running_asynch_code;
  int waiting = waiting_for_user_input_p;

  /* No need to gcpro these, because all we do with them later
     is test them for EQness, and none of them should be a string.  */
  odeactivate = Vdeactivate_mark;
  XSETBUFFER (obuffer, current_buffer);
  okeymap = current_buffer->keymap;

  sentinel = p->sentinel;
  if (NILP (sentinel))
    return;

  /* Zilch the sentinel while it's running, to avoid recursive invocations;
     assure that it gets restored no matter how the sentinel exits.  */
  p->sentinel = Qnil;
  record_unwind_protect (exec_sentinel_unwind, Fcons (proc, sentinel));
  /* Inhibit quit so that random quits don't screw up a running filter.  */
  specbind (Qinhibit_quit, Qt);
  specbind (Qlast_nonmenu_event, Qt);

  /* In case we get recursively called,
     and we already saved the match data nonrecursively,
     save the same match data in safely recursive fashion.  */
  if (outer_running_asynch_code)
    {
      Lisp_Object tem;
      tem = Fmatch_data (Qnil, Qnil);
      restore_match_data ();
      record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil));
      Fset_match_data (tem);
    }

  /* For speed, if a search happens within this code,
     save the match data in a special nonrecursive fashion.  */
  running_asynch_code = 1;

  internal_condition_case_1 (read_process_output_call,
			     Fcons (sentinel,
				    Fcons (proc, Fcons (reason, Qnil))),
			     !NILP (Vdebug_on_error) ? Qnil : Qerror,
			     exec_sentinel_error_handler);

  /* If we saved the match data nonrecursively, restore it now.  */
  restore_match_data ();
  running_asynch_code = outer_running_asynch_code;

  Vdeactivate_mark = odeactivate;

  /* Restore waiting_for_user_input_p as it was
     when we were called, in case the filter clobbered it.  */
  waiting_for_user_input_p = waiting;

#if 0
  if (! EQ (Fcurrent_buffer (), obuffer)
      || ! EQ (current_buffer->keymap, okeymap))
#endif
    /* But do it only if the caller is actually going to read events.
       Otherwise there's no need to make him wake up, and it could
       cause trouble (for example it would make Fsit_for return).  */
    if (waiting_for_user_input_p == -1)
      record_asynch_buffer_change ();

  unbind_to (count, Qnil);
}

/* Report all recent events of a change in process status
   (either run the sentinel or output a message).
   This is usually done while Emacs is waiting for keyboard input
   but can be done at other times.  */

void
status_notify ()
{
  register Lisp_Object proc, buffer;
  Lisp_Object tail, msg;
  struct gcpro gcpro1, gcpro2;

  tail = Qnil;
  msg = Qnil;
  /* We need to gcpro tail; if read_process_output calls a filter
     which deletes a process and removes the cons to which tail points
     from Vprocess_alist, and then causes a GC, tail is an unprotected
     reference.  */
  GCPRO2 (tail, msg);

  /* Set this now, so that if new processes are created by sentinels
     that we run, we get called again to handle their status changes.  */
  update_tick = process_tick;

  for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail))
    {
      Lisp_Object symbol;
      register struct Lisp_Process *p;

      proc = Fcdr (Fcar (tail));
      p = XPROCESS (proc);

      if (XINT (p->tick) != XINT (p->update_tick))
	{
	  XSETINT (p->update_tick, XINT (p->tick));

	  /* If process is still active, read any output that remains.  */
	  while (! EQ (p->filter, Qt)
		 && ! EQ (p->status, Qconnect)
		 && ! EQ (p->status, Qlisten)
		 && ! EQ (p->command, Qt)  /* Network process not stopped.  */
		 && XINT (p->infd) >= 0
		 && read_process_output (proc, XINT (p->infd)) > 0);

	  buffer = p->buffer;

	  /* Get the text to use for the message.  */
	  if (!NILP (p->raw_status_low))
	    update_status (p);
	  msg = status_message (p->status);

	  /* If process is terminated, deactivate it or delete it.  */
	  symbol = p->status;
	  if (CONSP (p->status))
	    symbol = XCAR (p->status);

	  if (EQ (symbol, Qsignal) || EQ (symbol, Qexit)
	      || EQ (symbol, Qclosed))
	    {
	      if (delete_exited_processes)
		remove_process (proc);
	      else
		deactivate_process (proc);
	    }

	  /* The actions above may have further incremented p->tick.
	     So set p->update_tick again
	     so that an error in the sentinel will not cause
	     this code to be run again.  */
	  XSETINT (p->update_tick, XINT (p->tick));
	  /* Now output the message suitably.  */
	  if (!NILP (p->sentinel))
	    exec_sentinel (proc, msg);
	  /* Don't bother with a message in the buffer
	     when a process becomes runnable.  */
	  else if (!EQ (symbol, Qrun) && !NILP (buffer))
	    {
	      Lisp_Object ro, tem;
	      struct buffer *old = current_buffer;
	      int opoint, opoint_byte;
	      int before, before_byte;

	      ro = XBUFFER (buffer)->read_only;

	      /* Avoid error if buffer is deleted
		 (probably that's why the process is dead, too) */
	      if (NILP (XBUFFER (buffer)->name))
		continue;
	      Fset_buffer (buffer);

	      opoint = PT;
	      opoint_byte = PT_BYTE;
	      /* Insert new output into buffer
		 at the current end-of-output marker,
		 thus preserving logical ordering of input and output.  */
	      if (XMARKER (p->mark)->buffer)
		Fgoto_char (p->mark);
	      else
		SET_PT_BOTH (ZV, ZV_BYTE);

	      before = PT;
	      before_byte = PT_BYTE;

	      tem = current_buffer->read_only;
	      current_buffer->read_only = Qnil;
	      insert_string ("\nProcess ");
	      Finsert (1, &p->name);
	      insert_string (" ");
	      Finsert (1, &msg);
	      current_buffer->read_only = tem;
	      set_marker_both (p->mark, p->buffer, PT, PT_BYTE);

	      if (opoint >= before)
		SET_PT_BOTH (opoint + (PT - before),
			     opoint_byte + (PT_BYTE - before_byte));
	      else
		SET_PT_BOTH (opoint, opoint_byte);

	      set_buffer_internal (old);
	    }
	}
    } /* end for */

  update_mode_lines++;  /* in case buffers use %s in mode-line-format */
  redisplay_preserve_echo_area (13);

  UNGCPRO;
}


DEFUN ("set-process-coding-system", Fset_process_coding_system,
       Sset_process_coding_system, 1, 3, 0,
       doc: /* Set coding systems of PROCESS to DECODING and ENCODING.
DECODING will be used to decode subprocess output and ENCODING to
encode subprocess input.  */)
     (proc, decoding, encoding)
     register Lisp_Object proc, decoding, encoding;
{
  register struct Lisp_Process *p;

  CHECK_PROCESS (proc);
  p = XPROCESS (proc);
  if (XINT (p->infd) < 0)
    error ("Input file descriptor of %s closed", SDATA (p->name));
  if (XINT (p->outfd) < 0)
    error ("Output file descriptor of %s closed", SDATA (p->name));
  Fcheck_coding_system (decoding);
  Fcheck_coding_system (encoding);

  p->decode_coding_system = decoding;
  p->encode_coding_system = encoding;
  setup_process_coding_systems (proc);

  return Qnil;
}

DEFUN ("process-coding-system",
       Fprocess_coding_system, Sprocess_coding_system, 1, 1, 0,
       doc: /* Return a cons of coding systems for decoding and encoding of PROCESS.  */)
     (proc)
     register Lisp_Object proc;
{
  CHECK_PROCESS (proc);
  return Fcons (XPROCESS (proc)->decode_coding_system,
		XPROCESS (proc)->encode_coding_system);
}

DEFUN ("set-process-filter-multibyte", Fset_process_filter_multibyte,
       Sset_process_filter_multibyte, 2, 2, 0,
       doc: /* Set multibyteness of the strings given to PROCESS's filter.
If FLAG is non-nil, the filter is given multibyte strings.
If FLAG is nil, the filter is given unibyte strings.  In this case,
all character code conversion except for end-of-line conversion is
suppressed.  */)
     (proc, flag)
     Lisp_Object proc, flag;
{
  register struct Lisp_Process *p;

  CHECK_PROCESS (proc);
  p = XPROCESS (proc);
  p->filter_multibyte = flag;
  setup_process_coding_systems (proc);

  return Qnil;
}

DEFUN ("process-filter-multibyte-p", Fprocess_filter_multibyte_p,
       Sprocess_filter_multibyte_p, 1, 1, 0,
       doc: /* Return t if a multibyte string is given to PROCESS's filter.*/)
     (proc)
     Lisp_Object proc;
{
  register struct Lisp_Process *p;

  CHECK_PROCESS (proc);
  p = XPROCESS (proc);

  return (NILP (p->filter_multibyte) ? Qnil : Qt);
}



/* The first time this is called, assume keyboard input comes from DESC
   instead of from where we used to expect it.
   Subsequent calls mean assume input keyboard can come from DESC
   in addition to other places.  */

static int add_keyboard_wait_descriptor_called_flag;

void
add_keyboard_wait_descriptor (desc)
     int desc;
{
  if (! add_keyboard_wait_descriptor_called_flag)
    FD_CLR (0, &input_wait_mask);
  add_keyboard_wait_descriptor_called_flag = 1;
  FD_SET (desc, &input_wait_mask);
  FD_SET (desc, &non_process_wait_mask);
  if (desc > max_keyboard_desc)
    max_keyboard_desc = desc;
}

/* From now on, do not expect DESC to give keyboard input.  */

void
delete_keyboard_wait_descriptor (desc)
     int desc;
{
  int fd;
  int lim = max_keyboard_desc;

  FD_CLR (desc, &input_wait_mask);
  FD_CLR (desc, &non_process_wait_mask);

  if (desc == max_keyboard_desc)
    for (fd = 0; fd < lim; fd++)
      if (FD_ISSET (fd, &input_wait_mask)
	  && !FD_ISSET (fd, &non_keyboard_wait_mask))
	max_keyboard_desc = fd;
}

/* Return nonzero if *MASK has a bit set
   that corresponds to one of the keyboard input descriptors.  */

int
keyboard_bit_set (mask)
     SELECT_TYPE *mask;
{
  int fd;

  for (fd = 0; fd <= max_keyboard_desc; fd++)
    if (FD_ISSET (fd, mask) && FD_ISSET (fd, &input_wait_mask)
	&& !FD_ISSET (fd, &non_keyboard_wait_mask))
      return 1;

  return 0;
}

void
init_process ()
{
  register int i;

#ifdef SIGCHLD
#ifndef CANNOT_DUMP
  if (! noninteractive || initialized)
#endif
    signal (SIGCHLD, sigchld_handler);
#endif

  FD_ZERO (&input_wait_mask);
  FD_ZERO (&non_keyboard_wait_mask);
  FD_ZERO (&non_process_wait_mask);
  max_process_desc = 0;

  FD_SET (0, &input_wait_mask);

  Vprocess_alist = Qnil;
  for (i = 0; i < MAXDESC; i++)
    {
      chan_process[i] = Qnil;
      proc_buffered_char[i] = -1;
    }
  bzero (proc_decode_coding_system, sizeof proc_decode_coding_system);
  bzero (proc_encode_coding_system, sizeof proc_encode_coding_system);
#ifdef DATAGRAM_SOCKETS
  bzero (datagram_address, sizeof datagram_address);
#endif

#ifdef HAVE_SOCKETS
 {
   Lisp_Object subfeatures = Qnil;
#define ADD_SUBFEATURE(key, val) \
  subfeatures = Fcons (Fcons (key, Fcons (val, Qnil)), subfeatures)

#ifdef NON_BLOCKING_CONNECT
   ADD_SUBFEATURE (QCnowait, Qt);
#endif
#ifdef DATAGRAM_SOCKETS
   ADD_SUBFEATURE (QCtype, Qdatagram);
#endif
#ifdef HAVE_LOCAL_SOCKETS
   ADD_SUBFEATURE (QCfamily, Qlocal);
#endif
#ifdef HAVE_GETSOCKNAME
   ADD_SUBFEATURE (QCservice, Qt);
#endif
#if !defined(TERM) && (defined(O_NONBLOCK) || defined(O_NDELAY))
   ADD_SUBFEATURE (QCserver, Qt);
#endif
#ifdef SO_BINDTODEVICE
   ADD_SUBFEATURE (QCoptions, intern ("bindtodevice"));
#endif
#ifdef SO_BROADCAST
   ADD_SUBFEATURE (QCoptions, intern ("broadcast"));
#endif
#ifdef SO_DONTROUTE
   ADD_SUBFEATURE (QCoptions, intern ("dontroute"));
#endif
#ifdef SO_KEEPALIVE
   ADD_SUBFEATURE (QCoptions, intern ("keepalive"));
#endif
#ifdef SO_LINGER
   ADD_SUBFEATURE (QCoptions, intern ("linger"));
#endif
#ifdef SO_OOBINLINE
   ADD_SUBFEATURE (QCoptions, intern ("oobinline"));
#endif
#ifdef SO_PRIORITY
   ADD_SUBFEATURE (QCoptions, intern ("priority"));
#endif
#ifdef SO_REUSEADDR
   ADD_SUBFEATURE (QCoptions, intern ("reuseaddr"));
#endif
   Fprovide (intern ("make-network-process"), subfeatures);
 }
#endif /* HAVE_SOCKETS */
}

void
syms_of_process ()
{
  Qprocessp = intern ("processp");
  staticpro (&Qprocessp);
  Qrun = intern ("run");
  staticpro (&Qrun);
  Qstop = intern ("stop");
  staticpro (&Qstop);
  Qsignal = intern ("signal");
  staticpro (&Qsignal);

  /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it
     here again.

     Qexit = intern ("exit");
     staticpro (&Qexit); */

  Qopen = intern ("open");
  staticpro (&Qopen);
  Qclosed = intern ("closed");
  staticpro (&Qclosed);
  Qconnect = intern ("connect");
  staticpro (&Qconnect);
  Qfailed = intern ("failed");
  staticpro (&Qfailed);
  Qlisten = intern ("listen");
  staticpro (&Qlisten);
  Qlocal = intern ("local");
  staticpro (&Qlocal);
  Qdatagram = intern ("datagram");
  staticpro (&Qdatagram);

  QCname = intern (":name");
  staticpro (&QCname);
  QCbuffer = intern (":buffer");
  staticpro (&QCbuffer);
  QChost = intern (":host");
  staticpro (&QChost);
  QCservice = intern (":service");
  staticpro (&QCservice);
  QCtype = intern (":type");
  staticpro (&QCtype);
  QClocal = intern (":local");
  staticpro (&QClocal);
  QCremote = intern (":remote");
  staticpro (&QCremote);
  QCcoding = intern (":coding");
  staticpro (&QCcoding);
  QCserver = intern (":server");
  staticpro (&QCserver);
  QCnowait = intern (":nowait");
  staticpro (&QCnowait);
  QCsentinel = intern (":sentinel");
  staticpro (&QCsentinel);
  QClog = intern (":log");
  staticpro (&QClog);
  QCnoquery = intern (":noquery");
  staticpro (&QCnoquery);
  QCstop = intern (":stop");
  staticpro (&QCstop);
  QCoptions = intern (":options");
  staticpro (&QCoptions);
  QCplist = intern (":plist");
  staticpro (&QCplist);
  QCfilter_multibyte = intern (":filter-multibyte");
  staticpro (&QCfilter_multibyte);

  Qlast_nonmenu_event = intern ("last-nonmenu-event");
  staticpro (&Qlast_nonmenu_event);

  staticpro (&Vprocess_alist);

  DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes,
	       doc: /* *Non-nil means delete processes immediately when they exit.
nil means don't delete them until `list-processes' is run.  */);

  delete_exited_processes = 1;

  DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type,
	       doc: /* Control type of device used to communicate with subprocesses.
Values are nil to use a pipe, or t or `pty' to use a pty.
The value has no effect if the system has no ptys or if all ptys are busy:
then a pipe is used in any case.
The value takes effect when `start-process' is called.  */);
  Vprocess_connection_type = Qt;

  defsubr (&Sprocessp);
  defsubr (&Sget_process);
  defsubr (&Sget_buffer_process);
  defsubr (&Sdelete_process);
  defsubr (&Sprocess_status);
  defsubr (&Sprocess_exit_status);
  defsubr (&Sprocess_id);
  defsubr (&Sprocess_name);
  defsubr (&Sprocess_tty_name);
  defsubr (&Sprocess_command);
  defsubr (&Sset_process_buffer);
  defsubr (&Sprocess_buffer);
  defsubr (&Sprocess_mark);
  defsubr (&Sset_process_filter);
  defsubr (&Sprocess_filter);
  defsubr (&Sset_process_sentinel);
  defsubr (&Sprocess_sentinel);
  defsubr (&Sset_process_window_size);
  defsubr (&Sset_process_inherit_coding_system_flag);
  defsubr (&Sprocess_inherit_coding_system_flag);
  defsubr (&Sset_process_query_on_exit_flag);
  defsubr (&Sprocess_query_on_exit_flag);
  defsubr (&Sprocess_contact);
  defsubr (&Sprocess_plist);
  defsubr (&Sset_process_plist);
  defsubr (&Slist_processes);
  defsubr (&Sprocess_list);
  defsubr (&Sstart_process);
#ifdef HAVE_SOCKETS
  defsubr (&Sset_network_process_options);
  defsubr (&Smake_network_process);
  defsubr (&Sformat_network_address);
#endif /* HAVE_SOCKETS */
#ifdef DATAGRAM_SOCKETS
  defsubr (&Sprocess_datagram_address);
  defsubr (&Sset_process_datagram_address);
#endif
  defsubr (&Saccept_process_output);
  defsubr (&Sprocess_send_region);
  defsubr (&Sprocess_send_string);
  defsubr (&Sinterrupt_process);
  defsubr (&Skill_process);
  defsubr (&Squit_process);
  defsubr (&Sstop_process);
  defsubr (&Scontinue_process);
  defsubr (&Sprocess_running_child_p);
  defsubr (&Sprocess_send_eof);
  defsubr (&Ssignal_process);
  defsubr (&Swaiting_for_user_input_p);
/*  defsubr (&Sprocess_connection); */
  defsubr (&Sset_process_coding_system);
  defsubr (&Sprocess_coding_system);
  defsubr (&Sset_process_filter_multibyte);
  defsubr (&Sprocess_filter_multibyte_p);
}


#else /* not subprocesses */

#include <sys/types.h>
#include <errno.h>

#include "lisp.h"
#include "systime.h"
#include "character.h"
#include "coding.h"
#include "termopts.h"
#include "sysselect.h"

extern int frame_garbaged;

extern EMACS_TIME timer_check ();
extern int timers_run;

Lisp_Object QCtype;

/* As described above, except assuming that there are no subprocesses:

   Wait for timeout to elapse and/or keyboard input to be available.

   time_limit is:
     timeout in seconds, or
     zero for no limit, or
     -1 means gobble data immediately available but don't wait for any.

   read_kbd is a Lisp_Object:
     0 to ignore keyboard input, or
     1 to return when input is available, or
     -1 means caller will actually read the input, so don't throw to
       the quit handler.
     a cons cell, meaning wait until its car is non-nil
       (and gobble terminal input into the buffer if any arrives), or
     We know that read_kbd will never be a Lisp_Process, since
     `subprocesses' isn't defined.

   do_display != 0 means redisplay should be done to show subprocess
   output that arrives.

   Return true iff we received input from any process.  */

int
wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
     int time_limit, microsecs;
     Lisp_Object read_kbd;
     int do_display;
{
  register int nfds;
  EMACS_TIME end_time, timeout;
  SELECT_TYPE waitchannels;
  int xerrno;
  /* Either nil or a cons cell, the car of which is of interest and
     may be changed outside of this routine.  */
  Lisp_Object wait_for_cell;

  wait_for_cell = Qnil;

  /* If waiting for non-nil in a cell, record where.  */
  if (CONSP (read_kbd))
    {
      wait_for_cell = read_kbd;
      XSETFASTINT (read_kbd, 0);
    }

  /* What does time_limit really mean?  */
  if (time_limit || microsecs)
    {
      EMACS_GET_TIME (end_time);
      EMACS_SET_SECS_USECS (timeout, time_limit, microsecs);
      EMACS_ADD_TIME (end_time, end_time, timeout);
    }

  /* Turn off periodic alarms (in case they are in use)
     and then turn off any other atimers,
     because the select emulator uses alarms.  */
  stop_polling ();
  turn_on_atimers (0);

  while (1)
    {
      int timeout_reduced_for_timers = 0;

      /* If calling from keyboard input, do not quit
	 since we want to return C-g as an input character.
	 Otherwise, do pending quit if requested.  */
      if (XINT (read_kbd) >= 0)
	QUIT;

      /* Exit now if the cell we're waiting for became non-nil.  */
      if (! NILP (wait_for_cell) && ! NILP (XCAR (wait_for_cell)))
	break;

      /* Compute time from now till when time limit is up */
      /* Exit if already run out */
      if (time_limit == -1)
	{
	  /* -1 specified for timeout means
	     gobble output available now
	     but don't wait at all. */

	  EMACS_SET_SECS_USECS (timeout, 0, 0);
	}
      else if (time_limit || microsecs)
	{
	  EMACS_GET_TIME (timeout);
	  EMACS_SUB_TIME (timeout, end_time, timeout);
	  if (EMACS_TIME_NEG_P (timeout))
	    break;
	}
      else
	{
	  EMACS_SET_SECS_USECS (timeout, 100000, 0);
	}

      /* If our caller will not immediately handle keyboard events,
	 run timer events directly.
	 (Callers that will immediately read keyboard events
	 call timer_delay on their own.)  */
      if (NILP (wait_for_cell))
	{
	  EMACS_TIME timer_delay;

	  do
	    {
	      int old_timers_run = timers_run;
	      timer_delay = timer_check (1);
	      if (timers_run != old_timers_run && do_display)
		/* We must retry, since a timer may have requeued itself
		   and that could alter the time delay.  */
		redisplay_preserve_echo_area (14);
	      else
		break;
	    }
	  while (!detect_input_pending ());

	  /* If there is unread keyboard input, also return.  */
	  if (XINT (read_kbd) != 0
	      && requeued_events_pending_p ())
	    break;

	  if (! EMACS_TIME_NEG_P (timer_delay) && time_limit != -1)
	    {
	      EMACS_TIME difference;
	      EMACS_SUB_TIME (difference, timer_delay, timeout);
	      if (EMACS_TIME_NEG_P (difference))
		{
		  timeout = timer_delay;
		  timeout_reduced_for_timers = 1;
		}
	    }
	}

      /* Cause C-g and alarm signals to take immediate action,
	 and cause input available signals to zero out timeout.  */
      if (XINT (read_kbd) < 0)
	set_waiting_for_input (&timeout);

      /* Wait till there is something to do.  */

      if (! XINT (read_kbd) && NILP (wait_for_cell))
	FD_ZERO (&waitchannels);
      else
	FD_SET (0, &waitchannels);

      /* If a frame has been newly mapped and needs updating,
	 reprocess its display stuff.  */
      if (frame_garbaged && do_display)
	{
	  clear_waiting_for_input ();
	  redisplay_preserve_echo_area (15);
	  if (XINT (read_kbd) < 0)
	    set_waiting_for_input (&timeout);
	}

      if (XINT (read_kbd) && detect_input_pending ())
	{
	  nfds = 0;
	  FD_ZERO (&waitchannels);
	}
      else
	nfds = select (1, &waitchannels, (SELECT_TYPE *)0, (SELECT_TYPE *)0,
		       &timeout);

      xerrno = errno;

      /* Make C-g and alarm signals set flags again */
      clear_waiting_for_input ();

      /*  If we woke up due to SIGWINCH, actually change size now.  */
      do_pending_window_change (0);

      if (time_limit && nfds == 0 && ! timeout_reduced_for_timers)
	/* We waited the full specified time, so return now.  */
	break;

      if (nfds == -1)
	{
	  /* If the system call was interrupted, then go around the
	     loop again.  */
	  if (xerrno == EINTR)
	    FD_ZERO (&waitchannels);
	  else
	    error ("select error: %s", emacs_strerror (xerrno));
	}
#ifdef sun
      else if (nfds > 0 && (waitchannels & 1)  && interrupt_input)
	/* System sometimes fails to deliver SIGIO.  */
	kill (getpid (), SIGIO);
#endif
#ifdef SIGIO
      if (XINT (read_kbd) && interrupt_input && (waitchannels & 1))
	kill (getpid (), SIGIO);
#endif

      /* Check for keyboard input */

      if ((XINT (read_kbd) != 0)
	  && detect_input_pending_run_timers (do_display))
	{
	  swallow_events (do_display);
	  if (detect_input_pending_run_timers (do_display))
	    break;
	}

      /* If there is unread keyboard input, also return.  */
      if (XINT (read_kbd) != 0
	  && requeued_events_pending_p ())
	break;

      /* If wait_for_cell. check for keyboard input
	 but don't run any timers.
	 ??? (It seems wrong to me to check for keyboard
	 input at all when wait_for_cell, but the code
	 has been this way since July 1994.
	 Try changing this after version 19.31.)  */
      if (! NILP (wait_for_cell)
	  && detect_input_pending ())
	{
	  swallow_events (do_display);
	  if (detect_input_pending ())
	    break;
	}

      /* Exit now if the cell we're waiting for became non-nil.  */
      if (! NILP (wait_for_cell) && ! NILP (XCAR (wait_for_cell)))
	break;
    }

  start_polling ();

  return 0;
}


/* Don't confuse make-docfile by having two doc strings for this function.
   make-docfile does not pay attention to #if, for good reason!  */
DEFUN ("get-buffer-process", Fget_buffer_process, Sget_buffer_process, 1, 1, 0,
       0)
     (name)
     register Lisp_Object name;
{
  return Qnil;
}

  /* Don't confuse make-docfile by having two doc strings for this function.
     make-docfile does not pay attention to #if, for good reason!  */
DEFUN ("process-inherit-coding-system-flag",
       Fprocess_inherit_coding_system_flag, Sprocess_inherit_coding_system_flag,
       1, 1, 0,
       0)
     (process)
     register Lisp_Object process;
{
  /* Ignore the argument and return the value of
     inherit-process-coding-system.  */
  return inherit_process_coding_system ? Qt : Qnil;
}

/* Kill all processes associated with `buffer'.
   If `buffer' is nil, kill all processes.
   Since we have no subprocesses, this does nothing.  */

void
kill_buffer_processes (buffer)
     Lisp_Object buffer;
{
}

void
init_process ()
{
}

void
syms_of_process ()
{
  QCtype = intern (":type");
  staticpro (&QCtype);

  defsubr (&Sget_buffer_process);
  defsubr (&Sprocess_inherit_coding_system_flag);
}


#endif /* not subprocesses */