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
11namespace IPC {
12namespace 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.
18class 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
28  base::PlatformFile file() const { return file_; }
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
38base::PlatformFile GetPlatformFile(scoped_refptr<MessageAttachment> attachment);
39
40}  // namespace internal
41}  // namespace IPC
42
43#endif  // IPC_IPC_PLATFORM_FILE_ATTACHMENT_H_
44