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87 lines
2.8 KiB
87 lines
2.8 KiB
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef IPC_IPC_PLATFORM_FILE_H_
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#define IPC_IPC_PLATFORM_FILE_H_
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#include "base/files/file.h"
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#include "base/process/process.h"
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#include "build/build_config.h"
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#include "ipc/ipc_message_support_export.h"
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#if defined(OS_POSIX) || defined(OS_FUCHSIA)
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#include "base/file_descriptor_posix.h"
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#endif
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namespace IPC {
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#if defined(OS_WIN)
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class IPC_MESSAGE_SUPPORT_EXPORT PlatformFileForTransit {
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public:
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// Creates an invalid platform file.
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PlatformFileForTransit();
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// Creates a platform file that takes unofficial ownership of |handle|. Note
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// that ownership is not handled by a Scoped* class due to usage patterns of
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// this class and its POSIX counterpart [base::FileDescriptor]. When this
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// class is used as an input to an IPC message, the IPC subsystem will close
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// |handle|. When this class is used as the output from an IPC message, the
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// receiver is expected to take ownership of |handle|.
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explicit PlatformFileForTransit(HANDLE handle);
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// Comparison operators.
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bool operator==(const PlatformFileForTransit& platform_file) const;
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bool operator!=(const PlatformFileForTransit& platform_file) const;
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HANDLE GetHandle() const;
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bool IsValid() const;
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private:
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HANDLE handle_;
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};
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#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
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typedef base::FileDescriptor PlatformFileForTransit;
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#endif
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inline PlatformFileForTransit InvalidPlatformFileForTransit() {
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#if defined(OS_WIN)
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return PlatformFileForTransit();
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#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
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return base::FileDescriptor();
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#endif
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}
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inline base::PlatformFile PlatformFileForTransitToPlatformFile(
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const PlatformFileForTransit& transit) {
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#if defined(OS_WIN)
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return transit.GetHandle();
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#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
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return transit.fd;
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#endif
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}
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inline base::File PlatformFileForTransitToFile(
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const PlatformFileForTransit& transit) {
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#if defined(OS_WIN)
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return base::File(transit.GetHandle());
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#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
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return base::File(transit.fd);
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#endif
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}
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// Creates a new handle that can be passed through IPC. The result must be
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// passed to the IPC layer as part of a message, or else it will leak.
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IPC_MESSAGE_SUPPORT_EXPORT PlatformFileForTransit
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GetPlatformFileForTransit(base::PlatformFile file, bool close_source_handle);
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// Creates a new handle that can be passed through IPC. The result must be
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// passed to the IPC layer as part of a message, or else it will leak.
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// Note that this function takes ownership of |file|.
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IPC_MESSAGE_SUPPORT_EXPORT PlatformFileForTransit
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TakePlatformFileForTransit(base::File file);
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} // namespace IPC
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#endif // IPC_IPC_PLATFORM_FILE_H_
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