ipc/glue/SharedMemory_windows.cpp

   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 <windows.h>
   8
   9 #include "mozilla/ipc/SharedMemory.h"
  10
  11 namespace mozilla {
  12 namespace ipc {
  13
  14 void SharedMemory::SystemProtect(char* aAddr, size_t aSize, int aRights) {
  15   if (!SystemProtectFallible(aAddr, aSize, aRights)) {
  16     MOZ_CRASH("can't VirtualProtect()");
  17   }
  18 }
  19
  20 bool SharedMemory::SystemProtectFallible(char* aAddr, size_t aSize,
  21                                          int aRights) {
  22   DWORD flags;
  23   if ((aRights & RightsRead) && (aRights & RightsWrite))
  24     flags = PAGE_READWRITE;
  25   else if (aRights & RightsRead)
  26     flags = PAGE_READONLY;
  27   else
  28     flags = PAGE_NOACCESS;
  29
  30   DWORD oldflags;
  31   return VirtualProtect(aAddr, aSize, flags, &oldflags);
  32 }
  33
  34 size_t SharedMemory::SystemPageSize() {
  35   SYSTEM_INFO si;
  36   GetSystemInfo(&si);
  37   return si.dwPageSize;
  38 }
  39
  40 }  // namespace ipc
  41 }  // namespace mozilla