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

int main(int argc, char** argv) {
     struct addrinfo hints, *ai;
     int result;
     memset(&hints, 0, sizeof(hints));
     hints.ai_flags = AI_CANONNAME;
     hints.ai_family = PF_UNSPEC;
     hints.ai_socktype = SOCK_STREAM;
     hints.ai_protocol = IPPROTO_TCP;
     result = getaddrinfo(argv[1], NULL, &hints, &ai);
     printf("Result %d %p\n", result, ai);
     if (result == 0 && ai != NULL) {
          printf("Canonname %s\n", ai->ai_canonname);
     }
}