glibc/sysdeps/generic/enbl-secure.c

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/* Define and initialize the `__libc_enable_secure' flag. Generic version.
Copyright (C) 1996 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
/* This file is used in the static libc. For the shared library,
dl-sysdep.c defines and initializes __libc_enable_secure. */
#include <unistd.h>
/* Safest assumption, if somehow the initializer isn't run. */
int __libc_enable_secure = 1;
static void __attribute__ ((unused, constructor))
init_secure (void)
{
__libc_enable_secure = (__geteuid () != __getuid () ||
__getegid () != __getgid ());
}