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// Copyright (c) 2012 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.
#ifndef IPC_IPC_CHANNEL_HANDLE_H_
#define IPC_IPC_CHANNEL_HANDLE_H_
#pragma once
#include <string>
#include "build/build_config.h"
#if defined(OS_POSIX)
#include "base/file_descriptor_posix.h"
#elif defined(OS_WIN)
#include <windows.h>
#endif // defined (OS_WIN)
// On Windows, any process can create an IPC channel and others can fetch
// it by name. We pass around the channel names over IPC.
// On Windows the initialization of ChannelHandle with an existing pipe
// handle is provided for convenience.
// NOTE: A ChannelHandle with a pipe handle Will NOT be marshalled over IPC.
// On POSIX, we instead pass around handles to channel endpoints via IPC.
// When it's time to IPC a new channel endpoint around, we send both the
// channel name as well as a base::FileDescriptor, which is itself a special
// type that knows how to copy a socket endpoint over IPC.
//
// In sum, this data structure can be used to pass channel information by name
// in both Windows and Posix. When passing a handle to a channel over IPC,
// use this data structure only for POSIX.
namespace IPC {
struct ChannelHandle {
// Note that serialization for this object is defined in the ParamTraits
// template specialization in ipc_message_utils.h.
ChannelHandle() {}
// The name that is passed in should be an absolute path for Posix.
// Otherwise there may be a problem in IPC communication between
// processes with different working directories.
ChannelHandle(const std::string& n) : name(n) {}
ChannelHandle(const char* n) : name(n) {}
#if defined(OS_WIN)
explicit ChannelHandle(HANDLE h) : pipe(h) {}
#elif defined(OS_POSIX)
ChannelHandle(const std::string& n, const base::FileDescriptor& s)
: name(n), socket(s) {}
#endif // defined(OS_POSIX)
std::string name;
#if defined(OS_POSIX)
base::FileDescriptor socket;
#elif defined(OS_WIN)
// A simple container to automatically initialize pipe handle
struct PipeHandle {
PipeHandle() : handle(NULL) {}
PipeHandle(HANDLE h) : handle(h) {}
HANDLE handle;
};
PipeHandle pipe;
#endif // defined (OS_WIN)
};
} // namespace IPC
#endif // IPC_IPC_CHANNEL_HANDLE_H_
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