sysdeps/mach/hurd/getresuid.c

   1 /* getresuid -- fetch real user ID, effective user ID, and saved-set user ID
   2    Copyright (C) 2002-2018 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
  31   HURD_CRITICAL_BEGIN;
  32   __mutex_lock (&_hurd_id.lock);
  33
  34   err = _hurd_check_ids ();
  35   if (!err)
  36     {
  37       if (_hurd_id.aux.nuids < 1)
  38         /* We do not even have a real UID.  */
  39         err = EGRATUITOUS;
  40       else
  41         {
  42           uid_t real = _hurd_id.aux.uids[0];
  43
  44           *ruid = real;
  45           *euid = _hurd_id.gen.nuids < 1 ? real : _hurd_id.gen.uids[0];
  46           *suid = _hurd_id.aux.nuids < 2 ? real : _hurd_id.aux.uids[1];
  47         }
  48     }
  49
  50   __mutex_unlock (&_hurd_id.lock);
  51   HURD_CRITICAL_END;
  52
  53   return __hurd_fail (err);
  54 }
  55 libc_hidden_def (__getresuid)
  56 weak_alias (__getresuid, getresuid)