1// Copyright (c) 2012 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#include <algorithm>
6
7#include "base/bind.h"
8#include "base/files/file.h"
9#include "base/location.h"
10#include "base/logging.h"
11#include "base/threading/worker_pool.h"
12#include "dbus/file_descriptor.h"
13
14using std::swap;
15
16namespace dbus {
17
18void CHROME_DBUS_EXPORT FileDescriptor::Deleter::operator()(
19    FileDescriptor* fd) {
20  base::WorkerPool::PostTask(
21      FROM_HERE, base::Bind(&base::DeletePointer<FileDescriptor>, fd), false);
22}
23
24FileDescriptor::FileDescriptor(FileDescriptor&& other) : FileDescriptor() {
25  Swap(&other);
26}
27
28FileDescriptor::~FileDescriptor() {
29  if (owner_)
30    base::File auto_closer(value_);
31}
32
33FileDescriptor& FileDescriptor::operator=(FileDescriptor&& other) {
34  Swap(&other);
35  return *this;
36}
37
38int FileDescriptor::value() const {
39  CHECK(valid_);
40  return value_;
41}
42
43int FileDescriptor::TakeValue() {
44  CHECK(valid_);  // NB: check first so owner_ is unchanged if this triggers
45  owner_ = false;
46  return value_;
47}
48
49void FileDescriptor::CheckValidity() {
50  base::File file(value_);
51  if (!file.IsValid()) {
52    valid_ = false;
53    return;
54  }
55
56  base::File::Info info;
57  bool ok = file.GetInfo(&info);
58  file.TakePlatformFile();  // Prevent |value_| from being closed by |file|.
59  valid_ = (ok && !info.is_directory);
60}
61
62void FileDescriptor::Swap(FileDescriptor* other) {
63  swap(value_, other->value_);
64  swap(owner_, other->owner_);
65  swap(valid_, other->valid_);
66}
67
68}  // namespace dbus
69