Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=8 sts=2 et sw=2 tw=80: */
       3             : /* This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : #include <sys/mman.h>         // mprotect
       8             : #include <unistd.h>           // sysconf
       9             : 
      10             : #include "mozilla/ipc/SharedMemory.h"
      11             : 
      12             : namespace mozilla {
      13             : namespace ipc {
      14             : 
      15             : void
      16          30 : SharedMemory::SystemProtect(char* aAddr, size_t aSize, int aRights)
      17             : {
      18          30 :   int flags = 0;
      19          30 :   if (aRights & RightsRead)
      20          11 :     flags |= PROT_READ;
      21          30 :   if (aRights & RightsWrite)
      22           8 :     flags |= PROT_WRITE;
      23          30 :   if (RightsNone == aRights)
      24          19 :     flags = PROT_NONE;
      25             : 
      26          30 :   if (0 < mprotect(aAddr, aSize, flags))
      27           0 :     MOZ_CRASH("can't mprotect()");
      28          30 : }
      29             : 
      30             : size_t
      31          41 : SharedMemory::SystemPageSize()
      32             : {
      33          41 :   return sysconf(_SC_PAGESIZE);
      34             : }
      35             : 
      36             : } // namespace ipc
      37             : } // namespace mozilla