ipc/ipc_message_attachment.h

   1 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef IPC_IPC_MESSAGE_ATTACHMENT_H_
   6 #define IPC_IPC_MESSAGE_ATTACHMENT_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "ipc/ipc_export.h"
  10
  11 namespace IPC {
  12
  13 // Auxiliary data sent with |Message|. This can be a platform file descriptor
  14 // or a mojo |MessagePipe|. |GetType()| returns the type of the subclass.
  15 class IPC_EXPORT MessageAttachment
  16     : public base::RefCounted<MessageAttachment> {
  17  public:
  18   enum Type {
  19     TYPE_PLATFORM_FILE,     // The instance is |PlatformFileAttachment|.
  20     TYPE_MOJO_MESSAGE_PIPE, // The instance is a mojo-based class.
  21   };
  22
  23   virtual Type GetType() const = 0;
  24
  25  protected:
  26   friend class base::RefCounted<MessageAttachment>;
  27   virtual ~MessageAttachment();
  28 };
  29
  30 }  // namespace IPC
  31
  32 #endif  // IPC_IPC_MESSAGE_ATTACHMENT_H_