Marcus Shawcroft writes:
> I have a query about the `net' package implementation provided with
> hslibs in ghc-4.08.....
>
> I have built some client server code which uses the UDP protocol.
>
> The primitives SocketPrim.sendTo and SocketPrim.recvFrom explicitly
> check the state of the socket and raise an exception if not connected
> (or listening) before invoking libc sendto and recvfrom.
>
> This would seem to me to be appropriate for stream orientated
> communication however for datagram communication the socket states
> `connected' and `listening' are not meaningful.
>
> To get my UDP code to work I had to modify SocketPrim.sendTo and
> SocketPrim.recvFrom to remove these socket state checks. In the
> situation that these primitives are invoked on an
> un-connected TCP style
> socket, the underlying libc functions return error codes which are
> handled appropriately by SocketPrim.
>
>
> Can someone out there clarify:
> 1) Did I miss something here, is there a more appropriate way of
> getting access to UDP.
> 2) Is there a reason why the socket state checks are made in
> SocketPrim instead of relying on the underlying libc error codes?
I think you're absolutely right. I'll commit a fix.
Cheers,
Simon
