Ability to send arbitrary FDs across processes

[mitsuhiko]

Currently only channels and shared memory regions can be sent via IPC. It would be nice if one could serialize arbitrary objects implementing IntoRawFd and FromRawFd.

eg:

let handle = Handle::new(File::open(...).unwrap());
tx.send(handle).unwrap();
let file = rx.recv().unwrap().into_inner();

[zaddach]

Hi, Is there any progress on this? This feature would be very useful.

[jdm]

Nobody is actively adding features to this crate right now. A pull request to implement this feature would be accepted, however.

[zaddach]

PR in #276