Server listening on existing socket / file descriptor

I have a server which listens on an existing socket:

```
http.createServer(app).listen({fd: 11});
```

This works fine if e.g. `node server.js` is called directly by the process that sets up that socket.

It also works fine with the cluster module, because although the socket is only available to the master process, all `listen()` invocations of the workers get passed to the master. So I merely have to have the master tell the workers what fd to listen on; I do that by passing them an environment variable when I fork them.

I'm unclear how to use `naught` with this kind of situation, since the socket would only be available to `naught` itself, and would not be available to my script which `naught` would launch.