sysdeps/mach/hurd/getgid.c

   1 /* Copyright (C) 1991 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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <unistd.h>
  22 #include <hurd.h>
  23
  24 /* Get the real group ID of the calling process.  */
  25 gid_t
  26 DEFUN_VOID(__getgid)
  27 {
  28   gid_t gid;
  29   __mutex_lock (&_hurd_idlock);
  30   if (!_hurd_id_valid)
  31     {
  32       error_t err = __auth_getids (_hurd_auth, &_hurd_id);
  33       if (err)
  34         {
  35           __mutex_unlock (&_hurd_idlock);
  36           return __hurd_fail (err);
  37         }
  38       _hurd_id_valid = 1;
  39     }
  40   gid = _hurd_id.rgid;
  41   __mutex_unlock (&_hurd_idlock);
  42   return gid;
  43 }