/* 
 * external.c - A program that responds to externally 
 *              generated events (ctrl-c) 
 */
#include <stdio.h> 
#include <unistd.h>
#include <stdlib.h> 
#include <signal.h> 

void handler(int sig) { 
    printf("Received SIGINT\n"); 
    fflush(stdout);
} 
 
int main() { 
    signal(SIGINT, handler); /* installs ctl-c handler */
    while(1) { 
	continue;
    } 
}