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// Copyright (c) 2015 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_MOJO_IPC_MOJO_HANDLE_ATTACHMENT_H_
#define IPC_MOJO_IPC_MOJO_HANDLE_ATTACHMENT_H_
#include "base/files/file.h"
#include "base/macros.h"
#include "build/build_config.h"
#include "ipc/ipc_export.h"
#include "ipc/ipc_message_attachment.h"
#include "mojo/public/cpp/system/handle.h"
namespace IPC {
namespace internal {
// A MessageAttachment that holds a MojoHandle.
// * On the sending side, every Mojo handle is a MessagePipe. This is because
// any platform files are wrapped by PlatformFileAttachment.
// * On the receiving side, the handle can be either MessagePipe or wrapped
// platform file: All files, not only MessagePipes are wrapped as a
// MojoHandle. The message deserializer should know which type of the object
// the handle wraps.
class IPC_MOJO_EXPORT MojoHandleAttachment : public MessageAttachment {
public:
explicit MojoHandleAttachment(mojo::ScopedHandle handle);
Type GetType() const override;
#if defined(OS_POSIX)
// Returns wrapped file if it wraps a file, or
// an invalid fd otherwise. The ownership of handle
// is passed to the caller.
base::PlatformFile TakePlatformFile() override;
#endif // OS_POSIX
// Returns the owning handle transferring the ownership.
mojo::ScopedHandle TakeHandle();
private:
~MojoHandleAttachment() override;
mojo::ScopedHandle handle_;
DISALLOW_COPY_AND_ASSIGN(MojoHandleAttachment);
};
} // namespace internal
} // namespace IPC
#endif // IPC_MOJO_IPC_MOJO_HANDLE_ATTACHMENT_H_
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