#include <stdio.h>
#include <unistd.h>
#include <signal.h>
    
void sigint_handler(int signum)
{
     printf("got SIGINT %d\n", signum);
}
 
int main(void)
{
    signal(SIGINT, sigint_handler);
    printf("pid is %d\n", getpid());
    while (1)
       sleep(1);
}