/* -*- 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/file_descriptor_posix.h"

#include "base/process.h"

#include "SharedMemory.h"

#include <mach/port.h>

#ifdef FUZZING

#include "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<mach_port_t> {

 public:

  static void SetupMachMemory(pid_t pid, ReceivePort* listen_port,

                              MachPortSender* listen_port_ack,

                              MachPortSender* send_port,

                              ReceivePort* send_port_ack, bool pidIsParent);

  static void CleanupForPid(pid_t pid);

  static void Shutdown();

  SharedMemoryBasic();

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

  virtual bool Create(size_t aNbytes) override;

  virtual bool Map(size_t nBytes) override;

  virtual void CloseHandle() override;

  virtual void* memory() const override {

#ifdef FUZZING

    return SharedMemoryFuzzer::MutateSharedMemory(mMemory, mAllocSize);

#else

    return mMemory;

#endif

  }

  virtual SharedMemoryType Type() const override { return TYPE_BASIC; }

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

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

  virtual bool ShareToProcess(base::ProcessId aProcessId,

                              Handle* aNewHandle) override;

 private:

  ~SharedMemoryBasic();

  void Unmap();

  mach_port_t 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