Asynchronous gethostbyname() ?

Anybody looked at this? http://www.chiark.greenend.org.uk/~ian/adns/ Advanced, easy to use, asynchronous-capable DNS client library. adns is a resolver library for C (and C++) programs. In contrast with the existing interfaces, gethostbyname et al and libresolv, it has the following features: - It is reasonably easy to use for simple programs which just want to translate names to addresses, look up MX records, etc. ====\ It can be used in an asynchronous, non-blocking, manner. Many ====/ queries can be handled simultaneously. etc