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// Copyright 2012 The Chromium Authors
// 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 <memory>
#include "base/files/file_descriptor_watcher_posix.h"
#include "base/functional/callback.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<void(bool succeeded)> 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();
CallbackType CancelInternal();
int notify_fd_;
int notify_token_;
CallbackType callback_;
std::unique_ptr<base::FileDescriptorWatcher::Controller> watcher_;
};
} // namespace net
#endif // NET_DNS_NOTIFY_WATCHER_MAC_H_
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