/*
 # Copyright (c) 2009 - OpenSLX Project, Computer Center University of Freiburg
 #
 # This program is free software distributed under the GPL version 2.
 # See http://openslx.org/COPYING
 #
 # If you have any feedback please consult http://openslx.org/feedback and
 # send your suggestions, praise, or complaints to feedback@openslx.org
 #
 # General information about OpenSLX can be found at http://openslx.org/
 # --------------------------------------------------------------------------
 # pvsPrivInputSignalHandler.cpp:
 #  - Handle signals forwarded over a file descriptor - implementation
 # --------------------------------------------------------------------------
 */

#include <unistd.h>
#include <sys/types.h>
#include <signal.h>
#include <cerrno>
#include "pvsPrivInputSocket.h"
#include "pvsPrivInputSignalHandler.h"

void PVSPrivInputSignalHandler::signalReceived(int sigfd)
{
	int signum;

	pid_t pid;
	uid_t uid;
	gid_t gid;
	int err;
	size_t siz = sizeof(signum);

	if(!pvsPrivInputRecvMessage(sigfd, &signum, siz, pid, uid, gid, &err))
	{
		qWarning("Should have received a signal but could not read message: %s", strerror(err));
		return;
	}

	if(siz != sizeof(signum))
	{
		qWarning("Sould have received a message of size %d bytes but got %d bytes instead. Discarding message.", (int)sizeof(signum), (int)siz);
		return;
	}

	if(!_allowUnauthenticatedKilling && pid != getpid())
	{
		qCritical("SOMETHING STRANGE IS GOING ON!\nReceived signal %d from PID %d\nPlease kill me instead of sending me signal notifications.", signum, (int)pid);
		return;
	}

	switch(signum)
	{
	case SIGINT:
		qDebug("Caught SIGINT. Quitting.");
		emit terminate();
		break;
	case SIGTERM:
		qDebug("Caught SIGTERM. Quitting.");
		emit terminate();
		break;
	case SIGHUP:
		qDebug("Caught SIGHUP. Reloading configuration.");
		emit reloadConfiguration();
		break;
	default:
		qWarning("Received signal %d, but don't know how to handle it.", signum);
	}
}