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/macros.h"
9 #include "base/memory/ref_counted.h"
10 #include "base/pickle.h"
11 #include "build/build_config.h"
12 #include "ipc/ipc_message_support_export.h"
13 #include "mojo/public/cpp/system/handle.h"
14 
15 namespace IPC {
16 
17 // Auxiliary data sent with |Message|. This can be a platform file descriptor
18 // or a mojo |MessagePipe|. |GetType()| returns the type of the subclass.
19 class IPC_MESSAGE_SUPPORT_EXPORT MessageAttachment
20     : public base::Pickle::Attachment {
21  public:
22   enum class Type {
23     MOJO_HANDLE,
24     PLATFORM_FILE,
25     WIN_HANDLE,
26     MACH_PORT,
27     FUCHSIA_HANDLE,
28   };
29 
30   static scoped_refptr<MessageAttachment> CreateFromMojoHandle(
31       mojo::ScopedHandle handle,
32       Type type);
33 
34   virtual Type GetType() const = 0;
35 
36   mojo::ScopedHandle TakeMojoHandle();
37 
38  protected:
39   friend class base::RefCountedThreadSafe<MessageAttachment>;
40   MessageAttachment();
41   ~MessageAttachment() override;
42 
43   DISALLOW_COPY_AND_ASSIGN(MessageAttachment);
44 };
45 
46 }  // namespace IPC
47 
48 #endif  // IPC_IPC_MESSAGE_ATTACHMENT_H_
49