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/*************************************************************************
** SignalHandler.h **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2011 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program is free software; you can redistribute it and/or **
** modify it under the terms of the GNU General Public License as **
** published by the Free Software Foundation; either version 3 of **
** the License, or (at your option) any later version. **
** **
** This program is distributed in the hope that it will be useful, but **
** WITHOUT ANY WARRANTY; without even the implied warranty of **
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the **
** GNU General Public License for more details. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#ifndef SIGNALHANDLER_H
#define SIGNALHANDLER_H
#include <exception>
struct SignalException : public std::exception {
};
class SignalHandler
{
public:
~SignalHandler ();
static SignalHandler& instance ();
bool start ();
void stop ();
void check ();
void trigger (bool notify);
bool active () const {return _active;}
protected:
SignalHandler () : _active(false) {}
static void callback (int signal);
private:
bool _active; ///< true if listening for signals
static bool _break; ///< true if signal has been caught
};
#endif
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