alarm-sigaction-example.c

// once
struct sigaction sigact, old_sigact;
sigact.sa_handler = handler;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = SA_INTERRUPT;
sigaction(SIGALRM, &sigact, &old_sigact) < 0);


// somewhere loop
while(1) {
  alarm(5);
  blocking_task();
  alarm(0);
}