#include	<sys/time.h>
#include	<signal.h>
#include	<unistd.h>
#include	<stdio.h>


void handler(int sig)
{
	printf("signal %d\n",sig);
}

int main(int argc, char *argv[] )
{
	static struct itimerval ivalue;
	static struct itimerval ovalue;

	sigset(SIGALRM,handler);

	ivalue.it_value.tv_usec = 900;
	ivalue.it_value.tv_sec = 0;

	ivalue.it_interval.tv_usec = 0;
	ivalue.it_interval.tv_sec = 3;

	setitimer(ITIMER_REAL, &ivalue, &ovalue);

	while(1)
		pause();
/*		sleep(1024);*/
}