listen_unix(
path,opts) ->listener,err
Create a bound listening Unix domain (AF_UNIX) stream socket
Creates and binds an AF_UNIX stream listener at path. A leading @
selects the Linux abstract namespace (no filesystem entry, auto-cleaned).
Returns a listener object whose accept method yields until a client
connects, returning a wrapped socket (no peer address for AF_UNIX).
accept takes a timeout (number) or { timeout = N, cancel = token }.
Options:
backlog (number): listen backlog (default 128)unlink (boolean): for filesystem paths, remove a stale socket file before
binding and on close (default true; ignored for abstract @ paths)