ipc/glue/SharedMemory_posix.cpp

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