// Copyright (c) 2012 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef NET_DNS_NOTIFY_WATCHER_MAC_H_ #define NET_DNS_NOTIFY_WATCHER_MAC_H_ #include "base/callback.h" #include "base/macros.h" #include "base/message_loop/message_loop.h" namespace net { // Watches for notifications from Libnotify and delivers them to a Callback. // After failure the watch is cancelled and will have to be restarted. class NotifyWatcherMac : public base::MessageLoopForIO::Watcher { public: // Called on received notification with true on success and false on error. typedef base::Callback CallbackType; NotifyWatcherMac(); // When deleted, automatically cancels. ~NotifyWatcherMac() override; // Registers for notifications for |key|. Returns true if succeeds. If so, // will deliver asynchronous notifications and errors to |callback|. bool Watch(const char* key, const CallbackType& callback); // Cancels the watch. void Cancel(); private: // MessageLoopForIO::Watcher: void OnFileCanReadWithoutBlocking(int fd) override; void OnFileCanWriteWithoutBlocking(int fd) override {} int notify_fd_; int notify_token_; CallbackType callback_; base::MessageLoopForIO::FileDescriptorWatcher watcher_; DISALLOW_COPY_AND_ASSIGN(NotifyWatcherMac); }; } // namespace net #endif // NET_DNS_NOTIFY_WATCHER_MAC_H_