Send callback functions through IPC from forked child_process in nodejs

Question

I'm using child_process to fork some work on a system. I have to send some data from the child to the "father" and I'm doing it like this:

process.send({
    message: "some_stuff",
    some : stuff,
    cb: cb
});

Where cb is a defined callback. On the other side ("father"'s side), inspecting the message received gives undefined for msg.cb. Thus I guess there is something preventing me to send callbacks through IPC. Also stringifying it doesn't work. Is there a clean way to do this or should I build an infrastructure to support callbacks?

Thanks