Back to index

glibc  2.9
getuid.c
Go to the documentation of this file.
00001 /* Copyright (C) 1993, 1994, 1995, 1997 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <unistd.h>
00021 #include <hurd.h>
00022 #include <hurd/id.h>
00023 
00024 /* Get the real user ID of the calling process.  */
00025 uid_t
00026 __getuid ()
00027 {
00028   error_t err;
00029   uid_t uid;
00030 
00031   HURD_CRITICAL_BEGIN;
00032   __mutex_lock (&_hurd_id.lock);
00033 
00034   if (err = _hurd_check_ids ())
00035     {
00036       errno = err;
00037       uid = -1;
00038     }
00039   else if (_hurd_id.aux.nuids >= 1)
00040     uid = _hurd_id.aux.uids[0];
00041   else
00042     {
00043       /* We do not even have a real uid.  */
00044       errno = EGRATUITOUS;
00045       uid = -1;
00046     }
00047 
00048   __mutex_unlock (&_hurd_id.lock);
00049   HURD_CRITICAL_END;
00050 
00051   return uid;
00052 }
00053 
00054 weak_alias (__getuid, getuid)