debug/readonly-area.c

   1 /* Copyright (C) 2004 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <stdlib.h>
  20
  21 /* Return 1 if the whole area PTR .. PTR+SIZE is not writable.
  22    Return -1 if it is writable.  */
  23
  24 int
  25 __readonly_area (const void *ptr, size_t size)
  26 {
  27   /* We cannot determine in general whether memory is writable or not.
  28      This must be handled in a system-dependent manner.  to not
  29      unconditionally break code we need to return here a positive
  30      answer.  This disables this security measure but that is the
  31      price people have to pay for using systems without a real
  32      implementation of this interface.  */
  33   return 1;
  34 }