Register a signal handler for SIGINT.

gistfile1.c

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

/*
 * Gracefully exits when Ctrl+C is pressed.
 */
void sigint_handler(int signum) {
    exit(0);
}

struct sigaction act;
memset((void *)&act, 0, sizeof(act));
act.sa_handler = sigint_handler;
if (sigaction(SIGINT, &act, NULL) == -1) {
    perror("sigaction");
    exit(-1);
}