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/*
Copyright 2013, 2015 Adam Reichold
This file is part of qpdfview.
qpdfview 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 2 of the License, or
(at your option) any later version.
qpdfview 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 qpdfview. If not, see <http://www.gnu.org/licenses/>.
*/
#include "signalhandler.h"
#include <signal.h>
#include <sys/socket.h>
#include <unistd.h>
#include <QSocketNotifier>
namespace qpdfview
{
int SignalHandler::s_sockets[2];
bool SignalHandler::prepareSignals()
{
if(socketpair(AF_UNIX, SOCK_STREAM, 0, s_sockets) != 0)
{
return false;
}
struct sigaction sigAction;
sigAction.sa_handler = SignalHandler::handleSignals;
sigemptyset(&sigAction.sa_mask);
sigAction.sa_flags = SA_RESTART;
if(sigaction(SIGINT, &sigAction, 0) != 0)
{
close(s_sockets[0]);
close(s_sockets[1]);
return false;
}
if(sigaction(SIGTERM, &sigAction, 0) != 0)
{
close(s_sockets[0]);
close(s_sockets[1]);
return false;
}
return true;
}
SignalHandler::SignalHandler(QObject* parent) : QObject(parent),
m_socketNotifier(0)
{
m_socketNotifier = new QSocketNotifier(s_sockets[1], QSocketNotifier::Read, this);
connect(m_socketNotifier, SIGNAL(activated(int)), SLOT(on_socketNotifier_activated()));
}
void SignalHandler::on_socketNotifier_activated()
{
m_socketNotifier->setEnabled(false);
int sigNumber = 0;
Q_UNUSED(read(s_sockets[1], &sigNumber, sizeof(int)));
switch(sigNumber)
{
case SIGINT:
emit sigIntReceived();
break;
case SIGTERM:
emit sigTermReceived();
break;
}
m_socketNotifier->setEnabled(true);
}
void SignalHandler::handleSignals(int sigNumber)
{
Q_UNUSED(write(s_sockets[0], &sigNumber, sizeof(int)));
}
} // qpdfview
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