signal_handler.h

/***************************************************************************
                          signal_handler.h  -  description
                             -------------------
    begin                : Fre Mär 14 2003
    copyright            : (C) 2003 by Bernd Roessler
    email                : roessler@informatik.uni-hamburg.de
 ***************************************************************************/

#ifndef SIGNAL_HANDLER_H
#define SIGNAL_HANDLER_H

#include "event_handler.h"
#include <signal.h>

class Signal_Handler {
public: 
        ~Signal_Handler();

  // Entry point.
  static Signal_Handler* instance (void);

  // Register an event handler <eh> for <signum>
  // and return a pointer to any existing <Event_Handler>
  // that was previously registered to handle <signum>.
  Event_Handler* register_handler (int signum, Event_Handler *eh);

  // Remove the <Event_Handler> for <signum>
  // by setting the slot in the <signal_handlers_>
  // table to NULL.
  void remove_handler (int signum);

private:
  // Ensure we're a Singleton.
  Signal_Handler (void);

  // Singleton pointer.
  static Signal_Handler* instance_;

  // Entry point adapter installed into <sigaction>
  // (must be a static method or a stand-alone
  // extern "C" function).
  static void dispatcher (int signum);

  // Table of pointers to concrete <Event_Handler>s
  // registered by applications.  NSIG is the number of
  // signals defined in </usr/include/sys/signal.h>.
  static Event_Handler* signal_handlers_[NSIG];

};

#endif

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