Alarm Example, Registering Signal Handlers Code in Linus Operating System

Registering Signal Handlers
 

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

void handler_for_alrm(int signo) { 
   printf("You can't interrupt me\n");
   time_t t1;
   time(&t1);  //t1=time(NULL);
   printf("Current time is %s\n", ctime(&t1);
   alarm(1);
}

int main() {
  printf("Welcome,pid=%d\n", getpid());
  signal(AIGALRM, handler_for_alrm);
  alarm(5);
  while (1)
    pause();
  return 0;
}