alarm-sane.c

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

atomic_int count = 0;

void sig_handler(int signum) {
  printf("Alarm %i\n", count++);

  if (count == 3) {
    exit(0);
  }

  alarm(1);
}

int main() {
  signal(SIGALRM,sig_handler);

  alarm(1);

  for(;;) {
    sleep(1);
  }
}