ipc/glue/SharedMemory_posix.cpp
author Mike Conley <mconley@mozilla.com>
Fri, 01 Mar 2019 22:36:33 +0000
changeset 519920 b7a51e2d1d66f6cc8a9792741dd911014a9e0db3
parent 505383 6f3709b3878117466168c40affa7bca0b60cf75b
child 538979 5645e0cc3915e49c4ffee8ce5c0080615caf565c
permissions -rw-r--r--
Bug 1521964 - Allow VideoSink to have a secondary VideoFrameContainer assigned to it. r=jya Differential Revision: https://phabricator.services.mozilla.com/D20022

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include <sys/mman.h>  // mprotect
#include <unistd.h>    // sysconf

#include "mozilla/ipc/SharedMemory.h"

namespace mozilla {
namespace ipc {

void SharedMemory::SystemProtect(char* aAddr, size_t aSize, int aRights) {
  int flags = 0;
  if (aRights & RightsRead) flags |= PROT_READ;
  if (aRights & RightsWrite) flags |= PROT_WRITE;
  if (RightsNone == aRights) flags = PROT_NONE;

  if (0 < mprotect(aAddr, aSize, flags)) MOZ_CRASH("can't mprotect()");
}

size_t SharedMemory::SystemPageSize() { return sysconf(_SC_PAGESIZE); }

}  // namespace ipc
}  // namespace mozilla