if (hints->ai_flags & AI_ADDRCONFIG)

    {

      /* We might need information about what interfaces are available.

	 Also determine whether we have IPv4 or IPv6 interfaces or both.  We

	 cannot cache the results since new interfaces could be added at

	 any time.  */

      __check_pf (&seen_ipv4, &seen_ipv6, &in6ai, &in6ailen);

      check_pf_called = true;

      /* Now make a decision on what we return, if anything.  */

      if (hints->ai_family == PF_UNSPEC && (seen_ipv4 || seen_ipv6))

	{

	  /* If we haven't seen both IPv4 and IPv6 interfaces we can

	     narrow down the search.  */

	  if ((! seen_ipv4 || ! seen_ipv6) && (seen_ipv4 || seen_ipv6))

	    {

	      local_hints = *hints;

	      local_hints.ai_family = seen_ipv4 ? PF_INET : PF_INET6;

	      hints = &local_hints;

	    }

	}

      else if ((hints->ai_family == PF_INET && ! seen_ipv4)

	       || (hints->ai_family == PF_INET6 && ! seen_ipv6))

	{

	  /* We cannot possibly return a valid answer.  */

	  __free_in6ai (in6ai);

	  return EAI_NONAME;

	}

    }