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// SignalHandler.hh for FbTk
// Copyright (c) 2002 - 2003 Henrik Kinnunen (fluxgen(at)users.sourceforge.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.
// $Id: SignalHandler.hh,v 1.6 2003/12/16 17:06:52 fluxgen Exp $
#ifndef FBTK_SIGNALHANDLER_HH
#define FBTK_SIGNALHANDLER_HH
#include <signal.h>
namespace FbTk {
/// Base class that SignalHandler calls when it gets a signal
/// Use this to catch system signals
class SignalEventHandler {
public:
virtual void handleSignal(int signum) = 0;
};
/// Handles system signals, singleton.
/**
Usage: inherit the class SignalEventHandler and then register
it to SignalHandler by calling registerHandler with
a signal number
*/
class SignalHandler {
public:
/// get singleton object
static SignalHandler &instance();
/**
Register an event handler
@return true on success else false
@param signum signal number
@param eh event handler
@param oldhandler_ret return handler to old sighandler
*/
bool registerHandler(int signum, SignalEventHandler *eh, SignalEventHandler **oldhandler_ret = 0);
/**
removes the signum handler
@param signum signal number
*/
void removeHandler(int signum);
private:
SignalHandler();
static void handleSignal(int signum);
static SignalEventHandler *s_signal_handler[NSIG]; ///< NSIG defined in signal.h
};
} // end namespace FbTk
#endif // FBTK_SIGNALHANDLER_HH
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