sysdeps/generic/enbl-secure.c

   1 /* Define and initialize the `__libc_enable_secure' flag.  Generic version.
   2    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 /* This file is used in the static libc.  For the shared library,
  21    dl-sysdep.c defines and initializes __libc_enable_secure.  */
  22
  23 #include <unistd.h>
  24
  25
  26 /* Safest assumption, if somehow the initializer isn't run.  */
  27 int __libc_enable_secure = 1;
  28
  29 /* We often need the UID.  */
  30 uid_t __libc_uid;
  31
  32 void
  33 __libc_init_secure (void)
  34 {
  35   __libc_uid = __getuid ();
  36   __libc_enable_secure = (__geteuid () != __libc_uid
  37                           || __getegid () != __getgid ());
  38 }