case '6':
		*_C_ai_family(&hints) = _C_AF_INET6
	}

	return doBlockingWithCtx(ctx, network+"/"+service, func() (int, error) {
		return cgoLookupServicePort(&hints, network, service)
	})
}

func cgoLookupServicePort(hints *_C_struct_addrinfo, network, service string) (port int, err error) {
	cservice, err := syscall.ByteSliceFromString(service)
	if err != nil {

		}

		// The _WSATYPE_NOT_FOUND error is returned by GetAddrInfoW
		// when the service name is unknown. We are also checking
		// for _WSAHOST_NOT_FOUND here to match the cgo (unix) version
		// cgo_unix.go (cgoLookupServicePort).
		if e == _WSATYPE_NOT_FOUND || e == _WSAHOST_NOT_FOUND {
			return 0, newDNSError(errUnknownPort, network+"/"+service, "")
		}
		return 0, newDNSError(winError("getaddrinfow", e), network+"/"+service, "")
	}