lib-src/ntlib.c

   1 /* Utility and Unix shadow routines for GNU Emacs support programs on NT.
   2    Copyright (C) 1994 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.
  20
  21    Geoff Voelker (voelker@cs.washington.edu)                         10-8-94
  22 */
  23
  24 #include <windows.h>
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27
  28 #define MAXPATHLEN _MAX_PATH
  29
  30 /* Emulate sleep...we could have done this with a define, but that
  31    would necessitate including windows.h in the files that used it.
  32    This is much easier.  */
  33 void
  34 nt_sleep(int seconds)
  35 {
  36   Sleep (seconds * 1000);
  37 }
  38
  39 /* Get the current working directory.  */
  40 int
  41 getwd (char *dir)
  42 {
  43   return GetCurrentDirectory (MAXPATHLEN, dir);
  44 }
  45
  46 static HANDLE getppid_parent;
  47 static int    getppid_ppid;
  48
  49 int
  50 getppid(void)
  51 {
  52   char *ppid;
  53   DWORD result;
  54
  55   ppid = getenv ("__PARENT_PROCESS_ID");
  56   if (!ppid)
  57     {
  58       printf("no pid.\n");
  59       return 0;
  60     }
  61   else
  62     {
  63       getppid_ppid = atoi (ppid);
  64     }
  65
  66   if (!getppid_parent)
  67     {
  68       getppid_parent = OpenProcess (SYNCHRONIZE, FALSE, atoi(ppid));
  69       if (!getppid_parent)
  70         {
  71           printf ("Failed to open handle to parent process: %d\n",
  72                  GetLastError());
  73           exit (1);
  74         }
  75     }
  76
  77   result = WaitForSingleObject (getppid_parent, 0);
  78   switch (result)
  79     {
  80     case WAIT_TIMEOUT:
  81       /* The parent is still alive.  */
  82       return getppid_ppid;
  83     case WAIT_OBJECT_0:
  84       /* The parent is gone.  Return the pid of Unix init (1).  */
  85       return 1;
  86     case WAIT_FAILED:
  87     default:
  88       printf ("Checking parent status failed: %d\n", GetLastError());
  89       exit (1);
  90     }
  91 }