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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