sysdeps/mach/hurd/getresgid.c

   1 /* getresgid -- fetch effective group ID, real group ID, and saved-set group ID
   2    Copyright (C) 2002 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <unistd.h>
  22 #include <hurd.h>
  23 #include <hurd/id.h>
  24
  25 /* Fetch the effective group ID, real group ID, and saved-set group ID,
  26    of the calling process.  */
  27 int
  28 __getresgid (gid_t *egid, gid_t *rgid, gid_t *sgid)
  29 {
  30   error_t err;
  31   gid_t eff, real, saved;
  32
  33   HURD_CRITICAL_BEGIN;
  34   __mutex_lock (&_hurd_id.lock);
  35
  36   err = _hurd_check_ids ();
  37   if (!err)
  38     {
  39       if (_hurd_id.aux.ngids < 1)
  40         /* We do not even have a real GID.  */
  41         err = EGRATUITOUS;
  42       else
  43         {
  44           real = _hurd_id.aux.gids[0];
  45           saved = _hurd_id.aux.ngids < 2 ? real :_hurd_id.aux.gids[1];
  46           eff = _hurd_id.gen.ngids < 1 ? real : _hurd_id.gen.gids[0];
  47         }
  48     }
  49
  50   __mutex_unlock (&_hurd_id.lock);
  51   HURD_CRITICAL_END;
  52
  53   if (err)
  54     return __hurd_fail (err);
  55
  56   *egid = eff;
  57   *rgid = real;
  58   *sgid = saved;
  59   return 0;
  60 }
  61 libc_hidden_def (__getresgid)
  62 weak_alias (__getresgid, getresgid)