Non-blocking HTTP form-post

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This examples makes a multipart form-post using the multi interface.
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
​
#include <curl/curl.h>
​
int main(void)
{
  CURL *curl;
​
  CURLM *multi_handle;
  int still_running = 0;
​
  curl_mime *form = NULL;
  curl_mimepart *field = NULL;
  struct curl_slist *headerlist = NULL;
  static const char buf[] = "Expect:";
​
  curl = curl_easy_init();
  multi_handle = curl_multi_init();
​
  if(curl && multi_handle) {
    /* Create the form */
    form = curl_mime_init(curl);
​
    /* Fill in the file upload field */
    field = curl_mime_addpart(form);
    curl_mime_name(field, "sendfile");
    curl_mime_filedata(field, "multi-post.c");
​
    /* Fill in the filename field */
    field = curl_mime_addpart(form);
    curl_mime_name(field, "filename");
    curl_mime_data(field, "multi-post.c", CURL_ZERO_TERMINATED);
​
    /* Fill in the submit field too, even if this is rarely needed */
    field = curl_mime_addpart(form);
    curl_mime_name(field, "submit");
    curl_mime_data(field, "send", CURL_ZERO_TERMINATED);
​
    /* initialize custom header list (stating that Expect: 100-continue is not
       wanted */
    headerlist = curl_slist_append(headerlist, buf);
​
    /* what URL that receives this POST */
    curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/upload.cgi");
    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
​
    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
    curl_easy_setopt(curl, CURLOPT_MIMEPOST, form);
​
    curl_multi_add_handle(multi_handle, curl);
​
    do {
      CURLMcode mc = curl_multi_perform(multi_handle, &still_running);
​
      if(still_running)
        /* wait for activity, timeout or "nothing" */
        mc = curl_multi_poll(multi_handle, NULL, 0, 1000, NULL);
​
      if(mc)
        break;
    } while(still_running);
​
    curl_multi_cleanup(multi_handle);
​
    /* always cleanup */
    curl_easy_cleanup(curl);
​
    /* then cleanup the form */
    curl_mime_free(form);
​
    /* free slist */
    curl_slist_free_all(headerlist);
  }
  return 0;
}
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