#define _POSIX_SOURCE

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

static void sig_int(int signo)
{
  printf("caught SIGINT\n");
}

int main(void) 
{
  sigset_t newmask, oldmask, pendmask;
  struct sigaction abc;

  
  abc.sa_handler = sig_int;
  sigemptyset(&abc.sa_mask);
  abc.sa_flags = 0;

  sigaction(SIGINT, &abc, NULL);
  
  for(;;) pause();
}