[pulseview.git] / signalhandler.cpp

/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2013 Adam Reichold
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include "signalhandler.h"

#include <signal.h>
#include <sys/socket.h>
#include <unistd.h>

#include <QSocketNotifier>

int SignalHandler::_sockets[2];

bool SignalHandler::prepare_signals()
{
	if(socketpair(AF_UNIX, SOCK_STREAM, 0, _sockets) != 0)
		return false;

	struct sigaction sig_action;

	sig_action.sa_handler = SignalHandler::handle_signals;
	sigemptyset(&sig_action.sa_mask);
	sig_action.sa_flags = SA_RESTART;

	if(sigaction(SIGINT, &sig_action, 0) != 0 ||
		sigaction(SIGTERM, &sig_action, 0) != 0) {
		close(_sockets[0]);
		close(_sockets[1]);
		return false;
	}

	return true;
}

SignalHandler::SignalHandler(QObject* parent) : QObject(parent),
	_socket_notifier(0)
{
	_socket_notifier = new QSocketNotifier(_sockets[1],
		QSocketNotifier::Read, this);
	connect(_socket_notifier, SIGNAL(activated(int)),
		SLOT(on_socket_notifier_activated()));
}

void SignalHandler::on_socket_notifier_activated()
{
	_socket_notifier->setEnabled(false);

	int sig_number;
	read(_sockets[1], &sig_number, sizeof(int));

	switch(sig_number)
	{
	case SIGINT:
		emit int_received();
		break;
	case SIGTERM:
		emit term_received();
		break;
	}

	_socket_notifier->setEnabled(true);
}

void SignalHandler::handle_signals(int sig_number)
{
	write(_sockets[0], &sig_number, sizeof(int));
}
Commit	Line	Data
	1	/*
	2	* This file is part of the PulseView project.
	3	*
	4	* Copyright (C) 2013 Adam Reichold
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#include "signalhandler.h"
	22
	23	#include <signal.h>
	24	#include <sys/socket.h>
	25	#include <unistd.h>
	26
	27	#include <QSocketNotifier>
	28
	29	int SignalHandler::_sockets[2];
	30
	31	bool SignalHandler::prepare_signals()
	32	{
	33	if(socketpair(AF_UNIX, SOCK_STREAM, 0, _sockets) != 0)
	34	return false;
	35
	36	struct sigaction sig_action;
	37
	38	sig_action.sa_handler = SignalHandler::handle_signals;
	39	sigemptyset(&sig_action.sa_mask);
	40	sig_action.sa_flags = SA_RESTART;
	41
	42	if(sigaction(SIGINT, &sig_action, 0) != 0 \|\|
	43	sigaction(SIGTERM, &sig_action, 0) != 0) {
	44	close(_sockets[0]);
	45	close(_sockets[1]);
	46	return false;
	47	}
	48
	49	return true;
	50	}
	51
	52	SignalHandler::SignalHandler(QObject* parent) : QObject(parent),
	53	_socket_notifier(0)
	54	{
	55	_socket_notifier = new QSocketNotifier(_sockets[1],
	56	QSocketNotifier::Read, this);
	57	connect(_socket_notifier, SIGNAL(activated(int)),
	58	SLOT(on_socket_notifier_activated()));
	59	}
	60
	61	void SignalHandler::on_socket_notifier_activated()
	62	{
	63	_socket_notifier->setEnabled(false);
	64
	65	int sig_number;
	66	read(_sockets[1], &sig_number, sizeof(int));
	67
	68	switch(sig_number)
	69	{
	70	case SIGINT:
	71	emit int_received();
	72	break;
	73	case SIGTERM:
	74	emit term_received();
	75	break;
	76	}
	77
	78	_socket_notifier->setEnabled(true);
	79	}
	80
	81	void SignalHandler::handle_signals(int sig_number)
	82	{
	83	write(_sockets[0], &sig_number, sizeof(int));
	84	}