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      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 
     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 
     24 FileDescriptor::FileDescriptor(FileDescriptor&& other) : FileDescriptor() {
     25   Swap(&other);
     26 }
     27 
     28 FileDescriptor::~FileDescriptor() {
     29   if (owner_)
     30     base::File auto_closer(value_);
     31 }
     32 
     33 FileDescriptor& FileDescriptor::operator=(FileDescriptor&& other) {
     34   Swap(&other);
     35   return *this;
     36 }
     37 
     38 int FileDescriptor::value() const {
     39   CHECK(valid_);
     40   return value_;
     41 }
     42 
     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 
     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 
     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