sysdeps/mach/hurd/getgid.c

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