SharedMemoryBasic_mach.h

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/* -*- 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/. */

#ifndef mozilla_ipc_SharedMemoryBasic_mach_h

#define mozilla_ipc_SharedMemoryBasic_mach_h

#include "base/process.h"

#include "mozilla/UniquePtrExtensions.h"

#include "mozilla/ipc/SharedMemory.h"

#include <mach/port.h>

#ifdef FUZZING

#  include "mozilla/ipc/SharedMemoryFuzzer.h"

#endif

//

// This is a low-level wrapper around platform shared memory.  Don't

// use it directly; use Shmem allocated through IPDL interfaces.

//

class MachPortSender;

class ReceivePort;

namespace mozilla {

namespace ipc {

class SharedMemoryBasic final

    : public SharedMemoryCommon<mozilla::UniqueMachSendRight> {

 public:

  SharedMemoryBasic();

  virtual bool SetHandle(Handle aHandle, OpenRights aRights) override;

  virtual bool Create(size_t aNbytes) override;

  virtual bool Map(size_t nBytes, void* fixed_address = nullptr) override;

  virtual void Unmap() override;

  virtual void* memory() const override {

#ifdef FUZZING

    return SharedMemoryFuzzer::MutateSharedMemory(mMemory, mAllocSize);

#else

    return mMemory;

#endif

  static Handle NULLHandle() { return Handle(); }

  static void* FindFreeAddressSpace(size_t aSize);

  virtual bool IsHandleValid(const Handle& aHandle) const override;

  virtual Handle CloneHandle() override;

  virtual Handle TakeHandle() override;

 private:

  ~SharedMemoryBasic();

  mozilla::UniqueMachSendRight mPort;

  // Pointer to mapped region, null if unmapped.

  void* mMemory;

  // Access rights to map an existing region with.

  OpenRights mOpenRights;

};

}  // namespace ipc

}  // namespace mozilla

#endif  // ifndef mozilla_ipc_SharedMemoryBasic_mach_h