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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file provides a C++ wrapping around the Mojo C API for platform handles,
// replacing the prefix of "Mojo" with a "mojo" namespace.
//
// Please see "mojo/public/c/system/platform_handle.h" for complete
// documentation of the API.
#ifndef MOJO_PUBLIC_CPP_SYSTEM_PLATFORM_HANDLE_H_
#define MOJO_PUBLIC_CPP_SYSTEM_PLATFORM_HANDLE_H_
#include <stdint.h>
#include "base/compiler_specific.h"
#include "base/files/file.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/shared_memory_handle.h"
#include "base/process/process_handle.h"
#include "mojo/public/c/system/platform_handle.h"
#include "mojo/public/cpp/system/buffer.h"
#include "mojo/public/cpp/system/handle.h"
#include "mojo/public/cpp/system/system_export.h"
#if defined(OS_WIN)
#include <windows.h>
#endif
namespace mojo {
#if defined(OS_POSIX)
const MojoPlatformHandleType kPlatformFileHandleType =
MOJO_PLATFORM_HANDLE_TYPE_FILE_DESCRIPTOR;
#if defined(OS_MACOSX) && !defined(OS_IOS)
const MojoPlatformHandleType kPlatformSharedBufferHandleType =
MOJO_PLATFORM_HANDLE_TYPE_MACH_PORT;
#else
const MojoPlatformHandleType kPlatformSharedBufferHandleType =
MOJO_PLATFORM_HANDLE_TYPE_FILE_DESCRIPTOR;
#endif // defined(OS_MACOSX) && !defined(OS_IOS)
#elif defined(OS_WIN)
const MojoPlatformHandleType kPlatformFileHandleType =
MOJO_PLATFORM_HANDLE_TYPE_WINDOWS_HANDLE;
const MojoPlatformHandleType kPlatformSharedBufferHandleType =
MOJO_PLATFORM_HANDLE_TYPE_WINDOWS_HANDLE;
#endif // defined(OS_POSIX)
// Wraps a PlatformFile as a Mojo handle. Takes ownership of the file object.
MOJO_CPP_SYSTEM_EXPORT
ScopedHandle WrapPlatformFile(base::PlatformFile platform_file);
// Unwraps a PlatformFile from a Mojo handle.
MOJO_CPP_SYSTEM_EXPORT
MojoResult UnwrapPlatformFile(ScopedHandle handle, base::PlatformFile* file);
// Wraps a base::SharedMemoryHandle as a Mojo handle. Takes ownership of the
// SharedMemoryHandle. Note that |read_only| is only an indicator of whether
// |memory_handle| only supports read-only mapping. It does NOT have any
// influence on the access control of the shared buffer object.
MOJO_CPP_SYSTEM_EXPORT
ScopedSharedBufferHandle WrapSharedMemoryHandle(
const base::SharedMemoryHandle& memory_handle,
size_t size,
bool read_only);
// Unwraps a base::SharedMemoryHandle from a Mojo handle. The caller assumes
// responsibility for the lifetime of the SharedMemoryHandle.
MOJO_CPP_SYSTEM_EXPORT MojoResult
UnwrapSharedMemoryHandle(ScopedSharedBufferHandle handle,
base::SharedMemoryHandle* memory_handle,
size_t* size,
bool* read_only);
#if defined(OS_MACOSX) && !defined(OS_IOS)
// Wraps a mach_port_t as a Mojo handle. This takes a reference to the
// Mach port.
MOJO_CPP_SYSTEM_EXPORT ScopedHandle WrapMachPort(mach_port_t port);
// Unwraps a mach_port_t from a Mojo handle. The caller gets ownership of the
// Mach port.
MOJO_CPP_SYSTEM_EXPORT MojoResult UnwrapMachPort(ScopedHandle handle,
mach_port_t* port);
#endif // defined(OS_MACOSX) && !defined(OS_IOS)
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_SYSTEM_PLATFORM_HANDLE_H_
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