Source

cpython-withatomic / Python / sysmodule.c

The branch 'legacy-trunk' does not exist.
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
/***********************************************************
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the names of Stichting Mathematisch
Centrum or CWI or Corporation for National Research Initiatives or
CNRI not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior
permission.

While CWI is the initial source for this software, a modified version
is made available by the Corporation for National Research Initiatives
(CNRI) at the Internet address ftp://ftp.python.org.

STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.

******************************************************************/

/* System module */

/*
Various bits of information used by the interpreter are collected in
module 'sys'.
Function member:
- exit(sts): raise SystemExit
Data members:
- stdin, stdout, stderr: standard file objects
- modules: the table of modules (dictionary)
- path: module search path (list of strings)
- argv: script arguments (list of strings)
- ps1, ps2: optional primary and secondary prompts (strings)
*/

#include "Python.h"

#include "osdefs.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef MS_COREDLL
extern void *PyWin_DLLhModule;
/* A string loaded from the DLL at startup: */
extern const char *PyWin_DLLVersionString;
#endif

PyObject *
PySys_GetObject(name)
	char *name;
{
	PyThreadState *tstate = PyThreadState_Get();
	PyObject *sd = tstate->interp->sysdict;
	return PyDict_GetItemString(sd, name);
}

FILE *
PySys_GetFile(name, def)
	char *name;
	FILE *def;
{
	FILE *fp = NULL;
	PyObject *v = PySys_GetObject(name);
	if (v != NULL && PyFile_Check(v))
		fp = PyFile_AsFile(v);
	if (fp == NULL)
		fp = def;
	return fp;
}

int
PySys_SetObject(name, v)
	char *name;
	PyObject *v;
{
	PyThreadState *tstate = PyThreadState_Get();
	PyObject *sd = tstate->interp->sysdict;
	if (v == NULL) {
		if (PyDict_GetItemString(sd, name) == NULL)
			return 0;
		else
			return PyDict_DelItemString(sd, name);
	}
	else
		return PyDict_SetItemString(sd, name, v);
}

static PyObject *
sys_exc_info(self, args)
	PyObject *self;
	PyObject *args;
{
	PyThreadState *tstate;
	if (!PyArg_Parse(args, ""))
		return NULL;
	tstate = PyThreadState_Get();
	return Py_BuildValue(
		"(OOO)",
		tstate->exc_type != NULL ? tstate->exc_type : Py_None,
		tstate->exc_value != NULL ? tstate->exc_value : Py_None,
		tstate->exc_traceback != NULL ?
			tstate->exc_traceback : Py_None);
}

static PyObject *
sys_exit(self, args)
	PyObject *self;
	PyObject *args;
{
	/* Raise SystemExit so callers may catch it or clean up. */
	PyErr_SetObject(PyExc_SystemExit, args);
	return NULL;
}

static PyObject *
sys_settrace(self, args)
	PyObject *self;
	PyObject *args;
{
	PyThreadState *tstate = PyThreadState_Get();
	if (args == Py_None)
		args = NULL;
	else
		Py_XINCREF(args);
	Py_XDECREF(tstate->sys_tracefunc);
	tstate->sys_tracefunc = args;
	Py_INCREF(Py_None);
	return Py_None;
}

static PyObject *
sys_setprofile(self, args)
	PyObject *self;
	PyObject *args;
{
	PyThreadState *tstate = PyThreadState_Get();
	if (args == Py_None)
		args = NULL;
	else
		Py_XINCREF(args);
	Py_XDECREF(tstate->sys_profilefunc);
	tstate->sys_profilefunc = args;
	Py_INCREF(Py_None);
	return Py_None;
}

static PyObject *
sys_setcheckinterval(self, args)
	PyObject *self;
	PyObject *args;
{
	PyThreadState *tstate = PyThreadState_Get();
	if (!PyArg_ParseTuple(args, "i", &tstate->interp->checkinterval))
		return NULL;
	Py_INCREF(Py_None);
	return Py_None;
}

#ifdef USE_MALLOPT
/* Link with -lmalloc (or -lmpc) on an SGI */
#include <malloc.h>

static PyObject *
sys_mdebug(self, args)
	PyObject *self;
	PyObject *args;
{
	int flag;
	if (!PyArg_Parse(args, "i", &flag))
		return NULL;
	mallopt(M_DEBUG, flag);
	Py_INCREF(Py_None);
	return Py_None;
}
#endif /* USE_MALLOPT */

static PyObject *
sys_getrefcount(self, args)
	PyObject *self;
	PyObject *args;
{
	PyObject *arg;
	if (!PyArg_Parse(args, "O", &arg))
		return NULL;
	return PyInt_FromLong((long) arg->ob_refcnt);
}

#ifdef COUNT_ALLOCS
static PyObject *
sys_getcounts(self, args)
	PyObject *self, *args;
{
	extern PyObject *get_counts Py_PROTO((void));

	if (!PyArg_Parse(args, ""))
		return NULL;
	return get_counts();
}
#endif

#ifdef Py_TRACE_REFS
/* Defined in objects.c because it uses static globals if that file */
extern PyObject *_Py_GetObjects Py_PROTO((PyObject *, PyObject *));
#endif

#ifdef DYNAMIC_EXECUTION_PROFILE
/* Defined in ceval.c because it uses static globals if that file */
extern PyObject *_Py_GetDXProfile Py_PROTO((PyObject *,  PyObject *));
#endif

static PyMethodDef sys_methods[] = {
	/* Might as well keep this in alphabetic order */
	{"exc_info",	sys_exc_info, 0},
	{"exit",	sys_exit, 0},
#ifdef COUNT_ALLOCS
	{"getcounts",	sys_getcounts, 0},
#endif
#ifdef DYNAMIC_EXECUTION_PROFILE
	{"getdxp",	_Py_GetDXProfile, 1},
#endif
#ifdef Py_TRACE_REFS
	{"getobjects",	_Py_GetObjects, 1},
#endif
	{"getrefcount",	sys_getrefcount, 0},
#ifdef USE_MALLOPT
	{"mdebug",	sys_mdebug, 0},
#endif
	{"setcheckinterval",	sys_setcheckinterval, 1},
	{"setprofile",	sys_setprofile, 0},
	{"settrace",	sys_settrace, 0},
	{NULL,		NULL}		/* sentinel */
};

static PyObject *
list_builtin_module_names()
{
	PyObject *list = PyList_New(0);
	int i;
	if (list == NULL)
		return NULL;
	for (i = 0; PyImport_Inittab[i].name != NULL; i++) {
		PyObject *name = PyString_FromString(
			PyImport_Inittab[i].name);
		if (name == NULL)
			break;
		PyList_Append(list, name);
		Py_DECREF(name);
	}
	if (PyList_Sort(list) != 0) {
		Py_DECREF(list);
		list = NULL;
	}
	if (list) {
		PyObject *v = PyList_AsTuple(list);
		Py_DECREF(list);
		list = v;
	}
	return list;
}

PyObject *
_PySys_Init()
{
	extern int fclose Py_PROTO((FILE *));
	PyObject *m, *v, *sysdict;
	PyObject *sysin, *sysout, *syserr;

	m = Py_InitModule("sys", sys_methods);
	sysdict = PyModule_GetDict(m);

	sysin = PyFile_FromFile(stdin, "<stdin>", "r", NULL);
	sysout = PyFile_FromFile(stdout, "<stdout>", "w", NULL);
	syserr = PyFile_FromFile(stderr, "<stderr>", "w", NULL);
	if (PyErr_Occurred())
		return NULL;
	PyDict_SetItemString(sysdict, "stdin", sysin);
	PyDict_SetItemString(sysdict, "stdout", sysout);
	PyDict_SetItemString(sysdict, "stderr", syserr);
	/* Make backup copies for cleanup */
	PyDict_SetItemString(sysdict, "__stdin__", sysin);
	PyDict_SetItemString(sysdict, "__stdout__", sysout);
	PyDict_SetItemString(sysdict, "__stderr__", syserr);
	Py_XDECREF(sysin);
	Py_XDECREF(sysout);
	Py_XDECREF(syserr);
	PyDict_SetItemString(sysdict, "version",
			     v = PyString_FromString(Py_GetVersion()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "copyright",
			     v = PyString_FromString(Py_GetCopyright()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "platform",
			     v = PyString_FromString(Py_GetPlatform()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "executable",
			     v = PyString_FromString(Py_GetProgramFullPath()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "prefix",
			     v = PyString_FromString(Py_GetPrefix()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "exec_prefix",
		   v = PyString_FromString(Py_GetExecPrefix()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "maxint",
			     v = PyInt_FromLong(PyInt_GetMax()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "builtin_module_names",
		   v = list_builtin_module_names());
	Py_XDECREF(v);
#ifdef MS_COREDLL
	PyDict_SetItemString(sysdict, "dllhandle",
			     v = PyInt_FromLong((int)PyWin_DLLhModule));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "winver",
			     v = PyString_FromString(PyWin_DLLVersionString));
	Py_XDECREF(v);
#endif
	if (PyErr_Occurred())
		return NULL;
	return m;
}

static PyObject *
makepathobject(path, delim)
	char *path;
	int delim;
{
	int i, n;
	char *p;
	PyObject *v, *w;
	
	n = 1;
	p = path;
	while ((p = strchr(p, delim)) != NULL) {
		n++;
		p++;
	}
	v = PyList_New(n);
	if (v == NULL)
		return NULL;
	for (i = 0; ; i++) {
		p = strchr(path, delim);
		if (p == NULL)
			p = strchr(path, '\0'); /* End of string */
		w = PyString_FromStringAndSize(path, (int) (p - path));
		if (w == NULL) {
			Py_DECREF(v);
			return NULL;
		}
		PyList_SetItem(v, i, w);
		if (*p == '\0')
			break;
		path = p+1;
	}
	return v;
}

void
PySys_SetPath(path)
	char *path;
{
	PyObject *v;
	if ((v = makepathobject(path, DELIM)) == NULL)
		Py_FatalError("can't create sys.path");
	if (PySys_SetObject("path", v) != 0)
		Py_FatalError("can't assign sys.path");
	Py_DECREF(v);
}

static PyObject *
makeargvobject(argc, argv)
	int argc;
	char **argv;
{
	PyObject *av;
	if (argc <= 0 || argv == NULL) {
		/* Ensure at least one (empty) argument is seen */
		static char *empty_argv[1] = {""};
		argv = empty_argv;
		argc = 1;
	}
	av = PyList_New(argc);
	if (av != NULL) {
		int i;
		for (i = 0; i < argc; i++) {
			PyObject *v = PyString_FromString(argv[i]);
			if (v == NULL) {
				Py_DECREF(av);
				av = NULL;
				break;
			}
			PyList_SetItem(av, i, v);
		}
	}
	return av;
}

void
PySys_SetArgv(argc, argv)
	int argc;
	char **argv;
{
	PyObject *av = makeargvobject(argc, argv);
	PyObject *path = PySys_GetObject("path");
	if (av == NULL)
		Py_FatalError("no mem for sys.argv");
	if (PySys_SetObject("argv", av) != 0)
		Py_FatalError("can't assign sys.argv");
	if (path != NULL) {
		char *argv0 = argv[0];
		char *p = NULL;
		int n = 0;
		PyObject *a;
#ifdef HAVE_READLINK
		char link[MAXPATHLEN+1];
		char argv0copy[2*MAXPATHLEN+1];
		int nr = 0;
		if (argc > 0 && argv0 != NULL)
			nr = readlink(argv0, link, MAXPATHLEN);
		if (nr > 0) {
			/* It's a symlink */
			link[nr] = '\0';
			if (link[0] == SEP)
				argv0 = link; /* Link to absolute path */
			else if (strchr(link, SEP) == NULL)
				; /* Link without path */
			else {
				/* Must join(dirname(argv0), link) */
				char *q = strrchr(argv0, SEP);
				if (q == NULL)
					argv0 = link; /* argv0 without path */
				else {
					/* Must make a copy */
					strcpy(argv0copy, argv0);
					q = strrchr(argv0copy, SEP);
					strcpy(q+1, link);
					argv0 = argv0copy;
				}
			}
		}
#endif /* HAVE_READLINK */
#if SEP == '\\' /* Special case for MS filename syntax */
		if (argc > 0 && argv0 != NULL) {
			char *q;
			p = strrchr(argv0, SEP);
			/* Test for alternate separator */
			q = strrchr(p ? p : argv0, '/');
			if (q != NULL)
				p = q;
			if (p != NULL) {
				n = p + 1 - argv0;
				if (n > 1 && p[-1] != ':')
					n--; /* Drop trailing separator */
			}
		}
#else /* All other filename syntaxes */
		if (argc > 0 && argv0 != NULL)
			p = strrchr(argv0, SEP);
		if (p != NULL) {
			n = p + 1 - argv0;
#if SEP == '/' /* Special case for Unix filename syntax */
			if (n > 1)
				n--; /* Drop trailing separator */
#endif /* Unix */
		}
#endif /* All others */
		a = PyString_FromStringAndSize(argv0, n);
		if (a == NULL)
			Py_FatalError("no mem for sys.path insertion");
		if (PyList_Insert(path, 0, a) < 0)
			Py_FatalError("sys.path.insert(0) failed");
		Py_DECREF(a);
	}
	Py_DECREF(av);
}