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glibc  2.9
mprotect.c
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00001 /* Copyright (C) 1994, 1996, 1997 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 <sys/types.h>
00020 #include <sys/mman.h>
00021 #include <errno.h>
00022 #include <mach.h>
00023 
00024 /* Change the memory protection of the region starting at ADDR and
00025    extending LEN bytes to PROT.  Returns 0 if successful, -1 for errors
00026    (and sets errno).  */
00027 
00028 int
00029 __mprotect (__ptr_t addr, size_t len, int prot)
00030 {
00031   kern_return_t err;
00032   vm_prot_t vmprot;
00033 
00034   vmprot = VM_PROT_NONE;
00035   if (prot & PROT_READ)
00036     vmprot |= VM_PROT_READ;
00037   if (prot & PROT_WRITE)
00038     vmprot |= VM_PROT_WRITE;
00039   if (prot & PROT_EXEC)
00040     vmprot |= VM_PROT_EXECUTE;
00041 
00042   if (err = __vm_protect (__mach_task_self (),
00043                        (vm_address_t) addr, (vm_size_t) len,
00044                        0, vmprot))
00045     {
00046       errno = err;
00047       return -1;
00048     }
00049   return 0;
00050 }
00051 weak_alias (__mprotect, mprotect)