program.h

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


/*
 * Describes getnameinfo()
 * Used to get the IPv4 or IPv6 address from an interface.
 */
#include <netdb.h>


/*
 * Describes getifaddrs() which returns an integer.
 * Describes freeifaddrs() which returns a void.
 * Used to get interface information.
 *
 */
#include <ifaddrs.h>


/*
 *
 *
 */