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

void al(int i){
    if(i == SIGALRM){
        printf("alarm\n");
        signal(SIGALRM, al);
    }
}

int main(){
    signal(SIGALRM, al);
    pause();
    return 0;
}