I have been successfully using the easy interface now for several days (using SFTP to do uploads). I'm now learning the multi-interface. I'm having an odd problem.
I have created 3 easy interfaces (that I know have worked in the past) and I'm stacking them onto a multi-interface using curl_multi_add_handle(). When I then run curl_multi_perform(), I'm surprised to find that it doesn't work. In fact the return value of curl_multi_perform is CURLE_UNSUPPORTED_PROTOCOL. That's very strange. After the curl_multi_perform fails, I try just running curl_easy_perform() on the one of the stacked interfaces and it works fine. Even though of course the only place that protocol is defined is when I set the URL on the easy interface. It's very odd. Can anyone advise why this would be happening? It doesn't seem to make sense. Two additional points of note that might be clues: 1) In my easy-interface upload, I was easily able to perform the upload just by using the CURLOPT_READDATA option and passing in an open file descriptor. I never created a read-callback function or used CURLOPT_READFUNCTION. 2) The second argument to curl_multi_perform() is coming back with really weird values. I expected 0, 1 or 2. Instead I'm getting a number 386144. - Saqib
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