In the net API (https://nodejs.org/api/net.html) Node allows the reception of an existing socket via its file descriptor - in the server.listen(handle[, backlog][, callback]) API. This is, among other things, useful when receiving the listening socket from a supervising daemon.
Unfortunately no such possibility appears to exist for the dgram API (https://nodejs.org/api/dgram.html).
This is a request to add such a feature in the future.
Thanks.