If we are doing a survey. I found a few more. It feels like we need to get everyone together in a room and say "we will let you out when you decide on a standard non-blocking address lookup" What a mess.

  - OpenBSD: getaddrinfo_async / asr_abort https://man.openbsd.org/asr_run
  - FreeBSD: dnsres_getaddrinfo / found no way to abort https://man.freebsd.org/cgi/man.cgi?query=dnsres