sysdeps/mach/hurd/group_member.c

   1 /* `group_member' -- test if process is in a given group.  Hurd version.
   2    Copyright (C) 1993, 1994, 1995, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <unistd.h>
  22 #include <hurd.h>
  23 #include <hurd/id.h>
  24
  25 int
  26 __group_member (gid)
  27      gid_t gid;
  28 {
  29   int member = 0;
  30   error_t err;
  31   void *crit;
  32
  33   crit = _hurd_critical_section_lock ();
  34   __mutex_lock (&_hurd_id.lock);
  35
  36   err = _hurd_check_ids ();
  37   if (! err)
  38     {
  39       size_t i;
  40       for (i = 0; i < _hurd_id.gen.ngids; ++i)
  41         if (_hurd_id.gen.gids[i] == gid)
  42           {
  43             member = 1;
  44             break;
  45           }
  46     }
  47
  48   __mutex_unlock (&_hurd_id.lock);
  49   _hurd_critical_section_unlock (crit);
  50
  51   if (err)
  52     __hurd_fail (err);
  53   return member;
  54 }
  55
  56 weak_alias (__group_member, group_member)