#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>

#define N 5

volatile int n = 0;

void hello(int signo) {
	printf("Hello\n");
	n++;
	alarm(1);
}

int main(int argc, char** argv) {
	struct sigaction sa;

	sa.sa_handler = hello;
	sa.sa_flags = 0;

	sigaction(SIGALRM, &sa, 0);
	alarm(1);
	
	while(n < N);

	return EXIT_SUCCESS;
}