gistfile1.c

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

static time_t lastSignal = 0;

void handler(int sig) {
    if(sig != SIGINT) {
        return;
    } else {
        printf("Received signal.\n");
        
        time_t now;
        time(&now);
        
        if(lastSignal > 0 && (now - lastSignal) <= 2) {
            exit(EXIT_SUCCESS);
        }
		
        
        lastSignal = now;
    }
    
}

int main( void )
{
	/* Place your handler somewhere around here */
    
	printf( "Hello World!\n" );
	for ( ;; )
	{
		/* infinite loop */
        signal(SIGINT, handler);
	}
    
	return 0;
}