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/files/file.h"
   9 #include "base/macros.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "ipc/ipc_export.h"
  12
  13 namespace IPC {
  14
  15 // Auxiliary data sent with |Message|. This can be a platform file descriptor
  16 // or a mojo |MessagePipe|. |GetType()| returns the type of the subclass.
  17 class IPC_EXPORT MessageAttachment
  18     : public base::RefCounted<MessageAttachment> {
  19  public:
  20   enum Type {
  21     TYPE_PLATFORM_FILE,  // The instance is |PlatformFileAttachment|.
  22     TYPE_MOJO_HANDLE,    // The instance is |MojoHandleAttachment|.
  23     TYPE_WIN_HANDLE,     // The instance is |HandleAttachmentWin|.
  24   };
  25
  26   virtual Type GetType() const = 0;
  27
  28 #if defined(OS_POSIX)
  29   virtual base::PlatformFile TakePlatformFile() = 0;
  30 #endif  // OS_POSIX
  31
  32  protected:
  33   friend class base::RefCounted<MessageAttachment>;
  34   MessageAttachment();
  35   virtual ~MessageAttachment();
  36
  37   DISALLOW_COPY_AND_ASSIGN(MessageAttachment);
  38 };
  39
  40 }  // namespace IPC
  41
  42 #endif  // IPC_IPC_MESSAGE_ATTACHMENT_H_