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/*************************************************************************
** SignalHandler.cpp **
** **
** 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/>. **
*************************************************************************/
#include <cerrno>
#include <csignal>
#include <cstdlib>
#include "SignalHandler.h"
using namespace std;
bool SignalHandler::_break = false;
SignalHandler::~SignalHandler() {
stop();
}
/** Returns the singleton handler object. */
SignalHandler& SignalHandler::instance() {
static SignalHandler handler;
return handler;
}
/** Starts listening to CTRL-C signals.
* @return true if handler was activated. */
bool SignalHandler::start () {
if (!_active) {
_break = false;
if (signal(SIGINT, SignalHandler::callback) != SIG_ERR) {
_active = true;
return true;
}
}
return false;
}
/** Stops listening for CTRL-C signals. */
void SignalHandler::stop () {
if (_active) {
signal(SIGINT, SIG_DFL);
_active = false;
}
}
/** Checks for incoming signals and throws an exception if CTRL-C was caught.
* @throw SignalException */
void SignalHandler::check() {
if (_break)
throw SignalException();
}
void SignalHandler::trigger (bool notify) {
_break = true;
if (notify)
check();
}
/** This function is called on CTRL-C signals. */
void SignalHandler::callback (int) {
_break = true;
}
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