--- /dev/null
+/*
+
+Copyright 2013 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>
+
+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;
+ 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)
+{
+ write(s_sockets[0], &sigNumber, sizeof(int));
+}