AF_UNSPEC resolver for localhost

quickaddrinfo.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <netdb.h>

int main()
{
    struct addrinfo hints;
    struct addrinfo *result;

    memset(&hints, 0, sizeof(struct addrinfo));

    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_DGRAM;

    int res = getaddrinfo("localhost", "7", &hints, &result);

    if (res != 0) {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(res));
        return 1;
    }

    struct addrinfo *node;

    char hostname[NI_MAXHOST];

    for (node = result; node != NULL; node = node->ai_next) {
        if (node->ai_family == AF_INET) {
            printf("Found AF_INET (%u):\n", AF_INET);
        } else if (node->ai_family == AF_INET6) {
            printf("Found AF_INET6 (%u):\n", AF_INET6);
        }

        res = getnameinfo(node->ai_addr, node->ai_addrlen,
                          hostname, NI_MAXHOST,
                          NULL, 0, NI_NUMERICHOST);

        if (res != 0) {
            fprintf(stderr, "gennameinfo failed: %s\n",
                    gai_strerror(res));
        }

        printf("- %s\n", hostname);

    }

    freeaddrinfo(result);

    return 0;
}