ipc/ipc_platform_file.h

// Copyright (c) 2011 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_PLATFORM_FILE_H_
#define IPC_IPC_PLATFORM_FILE_H_

#include "base/basictypes.h"
#include "base/files/file.h"
#include "base/process/process.h"
#include "ipc/ipc_export.h"

#if defined(OS_POSIX)
#include "base/file_descriptor_posix.h"
#endif

namespace IPC {

#if defined(OS_WIN)
typedef base::PlatformFile PlatformFileForTransit;
#elif defined(OS_POSIX)
typedef base::FileDescriptor PlatformFileForTransit;
#endif

inline PlatformFileForTransit InvalidPlatformFileForTransit() {
#if defined(OS_WIN)
  return INVALID_HANDLE_VALUE;
#elif defined(OS_POSIX)
  return base::FileDescriptor();
#endif
}

inline base::PlatformFile PlatformFileForTransitToPlatformFile(
    const PlatformFileForTransit& transit) {
#if defined(OS_WIN)
  return transit;
#elif defined(OS_POSIX)
  return transit.fd;
#endif
}

inline base::File PlatformFileForTransitToFile(
    const PlatformFileForTransit& transit) {
#if defined(OS_WIN)
  return base::File(transit);
#elif defined(OS_POSIX)
  return base::File(transit.fd);
#endif
}

// Returns a file handle equivalent to |file| that can be used in |process|.
IPC_EXPORT PlatformFileForTransit GetFileHandleForProcess(
    base::PlatformFile file,
    base::ProcessHandle process,
    bool close_source_handle);

// Returns a file handle equivalent to |file| that can be used in |process|.
// Note that this function takes ownership of |file|.
IPC_EXPORT PlatformFileForTransit TakeFileHandleForProcess(
    base::File file,
    base::ProcessHandle process);

}  // namespace IPC

#endif  // IPC_IPC_PLATFORM_FILE_H_