I am using multi curl to fetch a series of urls. This is following the
10-at-a-time prototype example.

The problem I am having is with dropped internet connections when this
function is already running. In such situations I would like U = 0 so
that the main loop ends and the function returns back to its origin.
This isn't happening. Most of the time after the internet connection is
dropped and then re-established, the function is stuck in the main while
loop with U != 0.

I've tried playing around with the function, commenting out and
debugging but I would appreciate any suggestions.

while(U)
{
   curl_multi_perform(curl_handle, &U);
   fprintf(mwp->wp->outputlog_fp, "main loop\n");

   while ((msg = curl_multi_info_read(curl_handle, &Q)))
   {
     if (msg->msg == CURLMSG_DONE)
     {
       fprintf(mwp->wp->outputlog_fp, "msg done\n");

       if (msg->data.result == CURLE_COULDNT_CONNECT ||
           msg->data.result == CURLE_OPERATION_TIMEDOUT ||
           msg->data.result == CURLE_COULDNT_RESOLVE_HOST)
       {
         fprintf(mwp->wp->outputlog_fp, "no connection\n");
         U = 0;
       }
     }

     /*
     if (msg->msg == CURLE_COULDNT_CONNECT ||
         msg->msg == CURLE_OPERATION_TIMEDOUT ||
         msg->msg == CURLE_COULDNT_RESOLVE_HOST)
     {
       fprintf(mwp->wp->outputlog_fp, "no connection\n");
       U = 0;
     }
     */
     else
     {
       fprintf(mwp->wp->outputlog_fp, "E: CURLMsg (%d)\n", msg->msg);
       //U = 0;
     }

     char *url;
     CURL *e = msg->easy_handle;
     curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, &url);
     fprintf(mwp->wp->outputlog_fp, "R: %d - %s <%s>\n",
msg->data.result, curl_easy_strerror(msg->data.result), url);
     curl_multi_remove_handle(curl_handle, e);
     curl_easy_cleanup(e);
   }
}
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Received on 2017-03-14