gethostbyname_internal
static struct hostent *gethostbyname_internal(const char *, int, res_state,
struct hostent *nhp = gethostbyname_internal(name, AF_INET6,
hp = gethostbyname_internal(name, AF_INET, res, hp, buf, buflen, he);
hp = gethostbyname_internal(name, af, res, hp, buf, buflen, he);