debug/readonly-area.c

   1 /* Copyright (C) 2004-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <stdlib.h>
  19
  20 /* Return 1 if the whole area PTR .. PTR+SIZE is not writable.
  21    Return -1 if it is writable.  */
  22
  23 int
  24 __readonly_area (const void *ptr, size_t size)
  25 {
  26   /* We cannot determine in general whether memory is writable or not.
  27      This must be handled in a system-dependent manner.  to not
  28      unconditionally break code we need to return here a positive
  29      answer.  This disables this security measure but that is the
  30      price people have to pay for using systems without a real
  31      implementation of this interface.  */
  32   return 1;
  33 }