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 
14 using std::swap;
15 
16 namespace dbus {
17 
operator ()(FileDescriptor * fd)18 void 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 
FileDescriptor(FileDescriptor && other)24 FileDescriptor::FileDescriptor(FileDescriptor&& other) : FileDescriptor() {
25   Swap(&other);
26 }
27 
~FileDescriptor()28 FileDescriptor::~FileDescriptor() {
29   if (owner_)
30     base::File auto_closer(value_);
31 }
32 
operator =(FileDescriptor && other)33 FileDescriptor& FileDescriptor::operator=(FileDescriptor&& other) {
34   Swap(&other);
35   return *this;
36 }
37 
value() const38 int FileDescriptor::value() const {
39   CHECK(valid_);
40   return value_;
41 }
42 
TakeValue()43 int FileDescriptor::TakeValue() {
44   CHECK(valid_);  // NB: check first so owner_ is unchanged if this triggers
45   owner_ = false;
46   return value_;
47 }
48 
CheckValidity()49 void 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 
Swap(FileDescriptor * other)62 void 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