I forgot... although the mistake was evident and fixed as described, this is still totally unclear to me:

Why wait(seconds=0.1) or higher allowed curl_multi_fdset to work fine (never in seg-fault) despite that NULL pointer.

It would be eye-opening to know...

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AW>> Out of curiosity Paolo could you elaborate on the nature of the bug

It was a truly functional mistake on my side. I was not aware that the server was sending back stuff that, in turn, curl_multi_fdset had to monitor.

That means, the first NULL pointer was sending curl_multi_fdset in seg-fault:

multiResult = curl_multi_fdset(multiSession, &fdread, NULL, NULL, &maxFD);

Trivially, this fixed everything:

multiResult = curl_multi_fdset(multiSession, &fdread, &fdwrite, NULL, &maxFD);

Thanks for asking.
                                               

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Received on 2011-06-14