AsyncSignalHandler.h

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/*
 * Copyright 2011-present Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once

#include <folly/io/async/EventBase.h>
#include <folly/portability/Event.h>
#include <map>

namespace folly {

class AsyncSignalHandler {
 public:
  explicit AsyncSignalHandler(EventBase* eventBase);
  virtual ~AsyncSignalHandler();

  void attachEventBase(EventBase* eventBase);

  void detachEventBase();

  EventBase* getEventBase() const {
    return eventBase_;
  }

  void registerSignalHandler(int signum);

  void unregisterSignalHandler(int signum);

  virtual void signalReceived(int signum) noexcept = 0;

 private:
  typedef std::map<int, struct event> SignalEventMap;

  // Forbidden copy constructor and assignment operator
  AsyncSignalHandler(AsyncSignalHandler const&);
  AsyncSignalHandler& operator=(AsyncSignalHandler const&);

  static void libeventCallback(libevent_fd_t signum, short events, void* arg);

  EventBase* eventBase_{nullptr};
  SignalEventMap signalEvents_;
};

} // namespace folly