// 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 #include "base/callback.h" #include "base/files/file_descriptor_watcher_posix.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: // Called on received notification with true on success and false on error. typedef base::RepeatingCallback CallbackType; NotifyWatcherMac(); NotifyWatcherMac(const NotifyWatcherMac&) = delete; NotifyWatcherMac& operator=(const NotifyWatcherMac&) = delete; // When deleted, automatically cancels. virtual ~NotifyWatcherMac(); // 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: // Called by |watcher_| when |notify_fd_| can be read without blocking. void OnFileCanReadWithoutBlocking(); int notify_fd_; int notify_token_; CallbackType callback_; std::unique_ptr watcher_; }; } // namespace net #endif // NET_DNS_NOTIFY_WATCHER_MAC_H_