Source

emacs / lib-src / ntlib.c

/* Utility and Unix shadow routines for GNU Emacs support programs on NT.
   Copyright (C) 1994 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, 675 Mass Ave, Cambridge, MA 02139, USA.

   Geoff Voelker (voelker@cs.washington.edu)                         10-8-94
*/

#include <windows.h>
#include <stdlib.h>
#include <stdio.h>

#define MAXPATHLEN _MAX_PATH

/* Emulate sleep...we could have done this with a define, but that
   would necessitate including windows.h in the files that used it.
   This is much easier.  */
void
nt_sleep(int seconds)
{
  Sleep (seconds * 1000);
}

/* Get the current working directory.  */
int
getwd (char *dir)
{
  return GetCurrentDirectory (MAXPATHLEN, dir);
}

static HANDLE getppid_parent;
static int    getppid_ppid;

int
getppid(void)
{
  char *ppid;
  DWORD result;

  ppid = getenv ("__PARENT_PROCESS_ID");
  if (!ppid) 
    {
      printf("no pid.\n");
      return 0;
    } 
  else 
    {
      getppid_ppid = atoi (ppid);
    }

  if (!getppid_parent) 
    {
      getppid_parent = OpenProcess (SYNCHRONIZE, FALSE, atoi(ppid));
      if (!getppid_parent) 
	{
	  printf ("Failed to open handle to parent process: %d\n",
		 GetLastError());
	  exit (1);
	}
    }

  result = WaitForSingleObject (getppid_parent, 0);
  switch (result) 
    {
    case WAIT_TIMEOUT:
      /* The parent is still alive.  */
      return getppid_ppid;
    case WAIT_OBJECT_0:
      /* The parent is gone.  Return the pid of Unix init (1).  */
      return 1;
    case WAIT_FAILED:
    default:
      printf ("Checking parent status failed: %d\n", GetLastError());
      exit (1);
    }
}