#include <signal.h>

void alarm_handler(int signo)
{
	return;
}

int main(void)
{
	int r;
	sigset_t s;
	sigemptyset(&s);

	signal(SIGALRM, &alarm_handler);
	alarm(1);
	r = sigsuspend(&s);
	if (r == -1)
		perror("sigsuspend");
	else
		printf("r is %d\n", r);
}