template of daemon with Qt4

qt_daemon.cxx

#include <qapplication.h>
#include <signal.h>
#include <unistd.h>

using namespace std;


void init_sig()
{
	auto handler = [](int sig){
		switch(sig){
		case SIGHUP:
		case SIGTERM:
		QCoreApplication::exit();
		}
	};
	signal(SIGCHLD,SIG_IGN); 
	signal(SIGTSTP,SIG_IGN); 
	signal(SIGTTOU,SIG_IGN);
	signal(SIGTTIN,SIG_IGN);
	signal(SIGHUP,handler); 
	signal(SIGTERM,handler); 
}

int main(int argc, char **argv)
{
	QCoreApplication app(argc, argv);
	init_sig();
	daemon(0,0);

  // your code here
  
	return app.exec();
}