Description:

Libasr allows to run DNS queries and perform hostname resolutions in a
fully asynchronous fashion. The implementation is thread-less,
fork-less, and does not make use of signals or other "tricks" that
might get in the developer's way. The API was initially developed for
the OpenBSD operating system, where it is natively supported.

This library is intended to bring this interface to other systems. It
is originally provided as a support library for the portable version
of the OpenSMTPD daemon, but it can be used in any other contexts.