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> It's not that easy to make connect non-blocking.

yes, that is unfortunately true - has the gory details...

> DNS queries are still blocking and that I can't solve.

libresolv (the most common unix resolver library) makes
this difficult/impossible.  fortunately, there are
alternative libraries that make it easy to do
asynchronous dns lookups (e.g. skadns) if one really
needs them.