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glibc  2.9
enbl-secure.c
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00001 /* Define and initialize the `__libc_enable_secure' flag.  Generic version.
00002    Copyright (C) 1996, 1997, 1998, 2000, 2003 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 /* This file is used in the static libc.  For the shared library,
00021    dl-sysdep.c defines and initializes __libc_enable_secure.  */
00022 
00023 #include <unistd.h>
00024 #include <libc-internal.h>
00025 
00026 /* If nonzero __libc_enable_secure is already set.  */
00027 int __libc_enable_secure_decided;
00028 /* Safest assumption, if somehow the initializer isn't run.  */
00029 int __libc_enable_secure = 1;
00030 
00031 void
00032 __libc_init_secure (void)
00033 {
00034   if (__libc_enable_secure_decided == 0)
00035     __libc_enable_secure = (__geteuid () != __getuid ()
00036                          || __getegid () != __getgid ());
00037 }