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add Eio_unix.Sockopt for setting/getting socket options #575
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Seems like socket options could be useful on non-Unix systems too. We could define the type in Eio.Net as an extensible variant and put the common ones there, adding Unix specific ones in Eio_unix.Net, etc. Would have to decide what to do about unsupported options.
SGTM. Right now, if a given sockopt isn't defined, it becomes (-1) and a call to it raises EINVAL (similar behaviour to the OCaml Unix module). I'll move the common definitions that work on Windows as well to Eio.Net, and then put the remaining ones in Eio_unix. |
There are some socket options that are Linux-specific which are quite handy to have. This adds a Eio_unix.Sockopt module which works on Eio_unix.Fd.t values.
This is a draft PR to check on the interface: the current PR replaces the need for Unix.setsockopt and has a single simple GADT for the socket options. Alternatively we could just expose the extended ones in the same style as upstream OCaml as a separate set of types, too. Opinions welcome.