Jamie Lokier wrote:
> For debugging, you (a) trace all system calls to a file, using
> something like the strace tool, and (b) modify the call to select() so
> that it iterates over each file descriptor in all the fd sets before
> the select() call, and inside the loop calls fcntl(fd, F_GETFL) to
> check if the descriptor is valid. Then you can look at the system
> call trace to find the last place where close() was called on that
> descriptor. If there isn't one, it's definitely a bug in setting up
> select parameters. If there is one, it might point to buggy code
> calling close().
>
> -- Jamie
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>
Jamie, thanks for these debugging hints. We still have to investigate
whether the problem is reproducable
(with the latest libCurl version, currently we use the old version 7.16.3).

Thanks, Stefan
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Received on 2009-11-13