text: /* getresuid -- fetch real user ID, effective user ID, and saved-set user ID
     Copyright (C) 2002, 2006 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, write to the Free
     Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     02111-1307 USA.  */
  
  #include <errno.h>
  #include <unistd.h>
  #include <hurd.h>
  #include <hurd/id.h>
  
  /* Fetch the real user ID, effective user ID, and saved-set user ID,
     of the calling process.  */
  int
  __getresuid (uid_t *ruid, uid_t *euid, uid_t *suid)
  {
    error_t err;
    uid_t real, eff, saved;
  
    HURD_CRITICAL_BEGIN;
    __mutex_lock (&_hurd_id.lock);
  
    err = _hurd_check_ids ();
    if (!err)
      {
        if (_hurd_id.aux.nuids < 1)
  	/* We do not even have a real UID.  */
  	err = EGRATUITOUS;
        else
  	{
  	  real = _hurd_id.aux.uids[0];
  	  eff = _hurd_id.gen.nuids < 1 ? real : _hurd_id.gen.uids[0];
  	  saved = _hurd_id.aux.nuids < 2 ? real : _hurd_id.aux.uids[1];
  	}
      }
  
    __mutex_unlock (&_hurd_id.lock);
    HURD_CRITICAL_END;
  
    if (err)
      return __hurd_fail (err);
  
    *ruid = real;
    *euid = eff;
    *suid = saved;
    return 0;
  }
  libc_hidden_def (__getresuid)
  weak_alias (__getresuid, getresuid)
  