getaddrinfo test, returns a list of IP addresses for a particular domain name

getaddrinfo.c

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

#define BUF_SIZE 500

int main(int argc, char *argv[]) {
        struct addrinfo hints;
        struct addrinfo *result, *rp;
        int sfd, s, j;
        size_t len;
        ssize_t nread;
        char buf[BUF_SIZE];
        char *port="80";

        if (argc < 2) {
                fprintf(stderr, "Usage: %s host \n", argv[0]);
                exit(EXIT_FAILURE);
        }

        /* Obtain address(es) matching host/port */

        memset(&hints, 0, sizeof(struct addrinfo));
        hints.ai_family = AF_UNSPEC;    /* Allow IPv4 or IPv6 */
        hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
        hints.ai_flags = 0;
        hints.ai_protocol = 0;          /* Any protocol */

        s = getaddrinfo(argv[1], port, &hints, &result);
        if (s != 0) {
                fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
                exit(EXIT_FAILURE);
        }
        /* getaddrinfo() returns a list of address structures.
           Try each address until we successfully connect(2).
           If socket(2) (or connect(2)) fails, we (close the socket
           and) try the next address. */

        for (rp = result; rp != NULL; rp = rp->ai_next) {
                printf("ip=%08x\n",(((struct sockaddr_in *)(rp->ai_addr))->sin_addr.s_addr));
        }

        freeaddrinfo(result);           /* No longer needed */

        exit(EXIT_SUCCESS);
}