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glibc  2.9
setreuid.c
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00001 /* Copyright (C) 2000 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 <unistd.h>
00020 
00021 #define ID_EFFECTIVE 0x01
00022 #define ID_REAL             0x02
00023 
00024 
00025 extern int setuidx (int mask, uid_t uid);
00026 
00027 int
00028 __setreuid (uid_t ruid, uid_t euid)
00029 {
00030   int res;
00031 
00032   if (ruid == euid)
00033     return setuidx (ID_EFFECTIVE | ID_REAL, euid);
00034 
00035   res = setuidx (ID_REAL, ruid);
00036   if (res == 0)
00037     res = setuidx (ID_EFFECTIVE, euid);
00038 
00039   return res;
00040 }
00041 strong_alias (__setreuid, setreuid)