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_PLATFORM_FILE_ATTACHMENT_H_
6 #define IPC_IPC_PLATFORM_FILE_ATTACHMENT_H_
7 
8 #include "ipc/ipc_export.h"
9 #include "ipc/ipc_message_attachment.h"
10 
11 namespace IPC {
12 namespace internal {
13 
14 // A platform file that is sent over |Channel| as a part of |Message|.
15 // PlatformFileAttachment optionally owns the file and |owning_| is set in that
16 // case. Also, |file_| is not cleared even after the ownership is taken.
17 // Some old clients require this strange behavior.
18 class IPC_EXPORT PlatformFileAttachment : public MessageAttachment {
19  public:
20   // Non-owning constructor
21   explicit PlatformFileAttachment(base::PlatformFile file);
22   // Owning constructor
23   explicit PlatformFileAttachment(base::ScopedFD file);
24 
25   Type GetType() const override;
26   base::PlatformFile TakePlatformFile() override;
27 
file()28   base::PlatformFile file() const { return file_; }
Owns()29   bool Owns() const { return owning_.is_valid(); }
30 
31  private:
32   ~PlatformFileAttachment() override;
33 
34   base::PlatformFile file_;
35   base::ScopedFD owning_;
36 };
37 
38 base::PlatformFile GetPlatformFile(scoped_refptr<MessageAttachment> attachment);
39 
40 }  // namespace internal
41 }  // namespace IPC
42 
43 #endif  // IPC_IPC_PLATFORM_FILE_ATTACHMENT_H_
44