text: /*
   * Copyright (c) 2018 David 'Mokon' Bond <mokon@mokon.net>
   * Author: David 'Mokon' Bond <mokon@mokon.net>
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy of
   * this software and associated documentation files (the "Software"), to deal in
   * the Software without restriction, including without limitation the rights to
   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
   * the Software, and to permit persons to whom the Software is furnished to do so,
   * subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
   * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
   * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
   * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   */
  
  #pragma once
  
  #include <atomic>
  #include <EventMonitor.hpp>
  #include <signal.h>
  
  namespace apm {
  
  class ExitHandler final
  {
    public:
      static ExitHandler* getInstance();
      void                setEventMonitor(EventMonitor& _eventMonitor);
  
    private:
      ExitHandler();
      ~ExitHandler();
      ExitHandler(const ExitHandler&) = delete;
      ExitHandler& operator=(const ExitHandler&) = delete;
      ExitHandler(ExitHandler&&)                 = delete;
      ExitHandler& operator=(ExitHandler&&) = delete;
  
    private:
      static void registerSignal(int sig);
      static void unregisterSignal(int sig);
      static void signalHandler(int sig, siginfo_t* siginfo, void* context);
  
    private:
      std::atomic<EventMonitor*> eventMonitor;
  
      static constexpr const int signals[] =
          {SIGABRT, SIGFPE, SIGILL, SIGINT, SIGSEGV, SIGTERM};
  };
  
  } // namespace apm
  