sysdeps/mach/hurd/getresuid.c

   1 /* getresuid -- fetch real user ID, effective user ID, and saved-set user ID
   2    Copyright (C) 2002-2016 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <unistd.h>
  21 #include <hurd.h>
  22 #include <hurd/id.h>
  23
  24 /* Fetch the real user ID, effective user ID, and saved-set user ID,
  25    of the calling process.  */
  26 int
  27 __getresuid (uid_t *ruid, uid_t *euid, uid_t *suid)
  28 {
  29   error_t err;
  30   uid_t real, eff, saved;
  31
  32   HURD_CRITICAL_BEGIN;
  33   __mutex_lock (&_hurd_id.lock);
  34
  35   err = _hurd_check_ids ();
  36   if (!err)
  37     {
  38       if (_hurd_id.aux.nuids < 1)
  39         /* We do not even have a real UID.  */
  40         err = EGRATUITOUS;
  41       else
  42         {
  43           real = _hurd_id.aux.uids[0];
  44           eff = _hurd_id.gen.nuids < 1 ? real : _hurd_id.gen.uids[0];
  45           saved = _hurd_id.aux.nuids < 2 ? real : _hurd_id.aux.uids[1];
  46         }
  47     }
  48
  49   __mutex_unlock (&_hurd_id.lock);
  50   HURD_CRITICAL_END;
  51
  52   if (err)
  53     return __hurd_fail (err);
  54
  55   *ruid = real;
  56   *euid = eff;
  57   *suid = saved;
  58   return 0;
  59 }
  60 libc_hidden_def (__getresuid)
  61 weak_alias (__getresuid, getresuid)