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glibc  2.9
readonly-area.c
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00001 /* Copyright (C) 2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <stdlib.h>
00020 
00021 /* Return 1 if the whole area PTR .. PTR+SIZE is not writable.
00022    Return -1 if it is writable.  */
00023 
00024 int
00025 __readonly_area (const void *ptr, size_t size)
00026 {
00027   /* We cannot determine in general whether memory is writable or not.
00028      This must be handled in a system-dependent manner.  to not
00029      unconditionally break code we need to return here a positive
00030      answer.  This disables this security measure but that is the
00031      price people have to pay for using systems without a real
00032      implementation of this interface.  */
00033   return 1;
00034 }