sysdeps/mach/mprotect.c

   1 /* Copyright (C) 1994, 1996, 1997 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <sys/types.h>
  20 #include <sys/mman.h>
  21 #include <errno.h>
  22 #include <mach.h>
  23
  24 /* Change the memory protection of the region starting at ADDR and
  25    extending LEN bytes to PROT.  Returns 0 if successful, -1 for errors
  26    (and sets errno).  */
  27
  28 int
  29 __mprotect (__ptr_t addr, size_t len, int prot)
  30 {
  31   kern_return_t err;
  32   vm_prot_t vmprot;
  33
  34   vmprot = VM_PROT_NONE;
  35   if (prot & PROT_READ)
  36     vmprot |= VM_PROT_READ;
  37   if (prot & PROT_WRITE)
  38     vmprot |= VM_PROT_WRITE;
  39   if (prot & PROT_EXEC)
  40     vmprot |= VM_PROT_EXECUTE;
  41
  42   if (err = __vm_protect (__mach_task_self (),
  43                           (vm_address_t) addr, (vm_size_t) len,
  44                           0, vmprot))
  45     {
  46       errno = err;
  47       return -1;
  48     }
  49   return 0;
  50 }
  51 weak_alias (__mprotect, mprotect)