[racket] flush is not enough, a list is needed

Also, unrelated to the problem above, I want to close everything correctly
> when a problem occurs, but it seems that dynamic wind does not do that in
> case of a break (e.g., if the exn handler is removed, an invalid operation
> will raise an exception, but the ports will not be closed). I may be
> misunderstanding what dynamic-wind does.
> What would be the "right" way to do things here?
>


Ok... That's just because I used tcp-connect instead of
tcp-connect/enable-break, as well as tcp-accept counterpart. Now that works
fine.

Laurent
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