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

void handler(int signum ){
  printf("signal caught\n");
  _exit(0);
}

int main() {
  pid_t pid;
  struct sigaction new_action, old_action;
  new_action.sa_handler = handler;
  sigemptyset (&new_action.sa_mask);
  new_action.sa_flags = 0;
  sigaction(SIGINT, &new_action, &old_action);
  if (pid = fork()) { //parent
    printf("killing.\n");
    sleep(2);
    kill(pid, SIGINT);
    sleep(2);
    printf("hihi\n");
  } else {
    for(;;);
  }
  return EXIT_SUCCESS;
}