Re: Multithread select() bug

[Davide Libenzi <davidel@xmailserver.org>]

On Mon, 10 May 2004, Andre Ben Hamou wrote:

> Davide Libenzi wrote:
> > Try:
> > 
> > 	select (socket + 1, &fds, &fds, &fds, &timeout);
> >                                  ^^^^^
> 
> That does work, but only as a workaround (and not a universally 
> applicable one). Select *should* return upon the closure of either end 
> of a socket connection that is in the read-FD-set only (unless I've 
> completely misunderstood the various references).

The standard says that select should return when the operation against the 
fd would not block *or* would return an error different from 
would-have-blocked. The following operation on a closed fd would be an 
EBADF, that fits the standard description. OTOH, MT is messy. Consider a 
thread that closes the fd and immediately after open another one having 
the same fd#. Bottom line is, don't do it.



- Davide