getaddrinfo_test.c

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

int main(int argc, char *argv[])  {

  const char *hostname = argv[1];
  const char *service = argv[2];
  struct addrinfo hints;
  struct addrinfo *res;

  memset(&hints, 0, sizeof(hints));
  hints.ai_family   = AF_INET6;
  hints.ai_socktype = SOCK_STREAM;
  hints.ai_flags    = AI_ADDRCONFIG;

  int result = getaddrinfo( hostname,
                            service,
                            &hints,
                            &res);

  printf("result:         %d\n", result);
  printf("ai_flags:       %d\n", res->ai_flags);
  printf("ai_family:      %d\n", res->ai_family);
  printf("ai_socktype:    %d\n", res->ai_socktype);
  printf("ai_protocol:    %d\n", res->ai_protocol);
  printf("Cononical Name: %s\n", res->ai_canonname);

  printf("Error?:         %s\n", gai_strerror(result));

}