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// 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/files/file.h"
#include "base/process/process.h"
#include "build/build_config.h"
#include "ipc/ipc_export.h"
#if defined(OS_POSIX)
#include "base/file_descriptor_posix.h"
#endif
namespace IPC {
#if defined(OS_WIN)
class IPC_EXPORT PlatformFileForTransit {
public:
// Creates an invalid platform file.
PlatformFileForTransit();
// Creates a platform file that takes unofficial ownership of |handle|. Note
// that ownership is not handled by a Scoped* class due to usage patterns of
// this class and its POSIX counterpart [base::FileDescriptor]. When this
// class is used as an input to an IPC message, the IPC subsystem will close
// |handle|. When this class is used as the output from an IPC message, the
// receiver is expected to take ownership of |handle|.
explicit PlatformFileForTransit(HANDLE handle);
// Comparison operators.
bool operator==(const PlatformFileForTransit& platform_file) const;
bool operator!=(const PlatformFileForTransit& platform_file) const;
HANDLE GetHandle() const;
bool IsValid() const;
private:
HANDLE handle_;
};
#elif defined(OS_POSIX)
typedef base::FileDescriptor PlatformFileForTransit;
#endif
inline PlatformFileForTransit InvalidPlatformFileForTransit() {
#if defined(OS_WIN)
return PlatformFileForTransit();
#elif defined(OS_POSIX)
return base::FileDescriptor();
#endif
}
inline base::PlatformFile PlatformFileForTransitToPlatformFile(
const PlatformFileForTransit& transit) {
#if defined(OS_WIN)
return transit.GetHandle();
#elif defined(OS_POSIX)
return transit.fd;
#endif
}
inline base::File PlatformFileForTransitToFile(
const PlatformFileForTransit& transit) {
#if defined(OS_WIN)
return base::File(transit.GetHandle());
#elif defined(OS_POSIX)
return base::File(transit.fd);
#endif
}
// Creates a new handle that can be passed through IPC. The result must be
// passed to the IPC layer as part of a message, or else it will leak.
IPC_EXPORT PlatformFileForTransit GetPlatformFileForTransit(
base::PlatformFile file,
bool close_source_handle);
// Creates a new handle that can be passed through IPC. The result must be
// passed to the IPC layer as part of a message, or else it will leak.
// Note that this function takes ownership of |file|.
IPC_EXPORT PlatformFileForTransit TakePlatformFileForTransit(base::File file);
} // namespace IPC
#endif // IPC_IPC_PLATFORM_FILE_H_
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