On Tue, 27 Jun 2006, K.S.Sreeram wrote:

> res = curl_multi_fdset(self->multi_handle, &self->read_fd_set,
> &self->write_fd_set, &self->exc_fd_set,
> &max_fd);
>
> In particular, curl_multi_fdset returning a max_fd of -1, is *not* an error.
> It just indicates that the fdset is empty. Just removing the check (max_fd <
> 0), fixes the problem.
>
> But, this seems to indicate some deeper problem in libcurl/c-ares itself.
> Why are there no sockets being returned by 'curl_multi_fdset' when an
> operation is still in progress???

I believe you've found the problem that we already fixed in CVS:

   http://cool.haxx.se/cvs.cgi/curl/lib/multi.c.diff?r1=1.80&r2=1.81

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