Support for socket options

[anmonteiro]

Right now both Eio.Net.{connect,accept} return a socket, but I didn't find a way to e.g. set TCP_NODELAY on the stream socket. Did I miss an API?

[talex5]

Looks like it's missing, indeed.

I was using it originally with the HTTP benchmark, but now that sends everything in a single packet it doesn't make any difference there.

As a work-around, you can of course get the FD directly:

Unix.setsockopt (Eio_unix.FD.peek_opt ssock |> Option.get) Unix.TCP_NODELAY true;

[talex5]

Note there is an old draft PR related to this at #575.

Getting that rebased onto the current main branch would be a good start.

[talex5]

Yes, I think that PR was going in the right direction. It looks like it just never got finished.

[rbjorklin]

Leaving a breadcrumb for any future folks who find their way here.

The way to do this now seems to be by using Eio_unix.Net.fd and Eio_unix.Fd.use.