[racket] Read timeouts on tcp ports?...

Hi there everybody,

I'm not sure if this hasn't been discussed before (at least didn't  
find any reference in google), so apologies if this should be a dupe:

How do I set a read timeout on a port (in this case, a TCP port)? In  
native socket API, it's done via setsockopt() but the socket option  
set is naturally shielded from application programmers. I couldn't  
find a hint about timeouting read in the documentation for file I/O  
which the port concept is a part of.

Thanks!