[otterley]

ldns is synchronous so all your queries will block. libunbound (https://www.unbound.net/documentation/libunbound.html), like c-ares, is an async C resolver library from the authors of ldns.

[blechschmidt]

Ah, that would mean that I would have the libraries handle the resolving. I was currently only thinking about keeping the single socket which is used in order to only use the parsing functions from the libraries.