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glibc  2.9
geteuid.c
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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 effective user ID of the calling process.  */
00025 uid_t
00026 __geteuid ()
00027 {
00028   error_t err;
00029   uid_t euid;
00030 
00031   HURD_CRITICAL_BEGIN;
00032   __mutex_lock (&_hurd_id.lock);
00033 
00034   if (err = _hurd_check_ids ())
00035     {
00036       errno = err;
00037       euid = -1;
00038     }
00039   else if (_hurd_id.gen.nuids >= 1)
00040     euid = _hurd_id.gen.uids[0];
00041   else if (_hurd_id.aux.nuids >= 1)
00042     /* We have no effective uids.  Return the real uid.  */
00043     euid = _hurd_id.aux.uids[0];
00044   else
00045     {
00046       /* We do not even have a real uid.  */
00047       errno = EGRATUITOUS;
00048       euid = -1;
00049     }
00050 
00051   __mutex_unlock (&_hurd_id.lock);
00052   HURD_CRITICAL_END;
00053 
00054   return euid;
00055 }
00056 
00057 weak_alias (__geteuid, geteuid)