ntlib.c 2.25 KB
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/* Utility and Unix shadow routines for GNU Emacs support programs on NT.
   Copyright (C) 1994 Free Software Foundation, Inc.

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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.
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   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);
}

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int
getpid ()
{
  return _getpid ();
}

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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);
    }
}