File: ipc_mojo_handle_attachment.h

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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef IPC_IPC_MOJO_HANDLE_ATTACHMENT_H_
#define IPC_IPC_MOJO_HANDLE_ATTACHMENT_H_

#include "build/build_config.h"
#include "ipc/ipc_message_attachment.h"
#include "ipc/ipc_message_support_export.h"
#include "mojo/public/cpp/system/handle.h"

namespace IPC {

namespace internal {

// A MessageAttachment that holds a MojoHandle.
// This can hold any type of transferrable Mojo handle (i.e. message pipe, data
// pipe, etc), but the receiver is expected to know what type of handle to
// expect.
class IPC_MESSAGE_SUPPORT_EXPORT MojoHandleAttachment
    : public MessageAttachment {
 public:
  explicit MojoHandleAttachment(mojo::ScopedHandle handle);

  MojoHandleAttachment(const MojoHandleAttachment&) = delete;
  MojoHandleAttachment& operator=(const MojoHandleAttachment&) = delete;

  Type GetType() const override;

  // Returns the owning handle transferring the ownership.
  mojo::ScopedHandle TakeHandle();

 private:
  ~MojoHandleAttachment() override;
  mojo::ScopedHandle handle_;
};

}  // namespace internal
}  // namespace IPC

#endif  // IPC_IPC_MOJO_HANDLE_ATTACHMENT_H_