multi-post.c

/*****************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * $Id: multi-post.c,v 1.6 2008-05-22 21:20:09 danf Exp $
 *
 * This is an example application source code using the multi interface
 * to do a multipart formpost without "blocking".
 */ 
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
 
#include <curl/curl.h>
 
int main(int argc, char *argv[])
{
  CURL *curl;
 
  CURLM *multi_handle;
  int still_running;
 
  struct curl_httppost *formpost=NULL;
  struct curl_httppost *lastptr=NULL;
  struct curl_slist *headerlist=NULL;
  static const char buf[] = "Expect:";
 
  /* Fill in the file upload field. This makes libcurl load data from  
     the given file name when curl_easy_perform() is called. */ 
  curl_formadd(&formpost,
               &lastptr,
               CURLFORM_COPYNAME, "sendfile",
               CURLFORM_FILE, "postit2.c",
               CURLFORM_END);
 
  /* Fill in the filename field */ 
  curl_formadd(&formpost,
               &lastptr,
               CURLFORM_COPYNAME, "filename",
               CURLFORM_COPYCONTENTS, "postit2.c",
               CURLFORM_END);
 
  /* Fill in the submit field too, even if this is rarely needed */ 
  curl_formadd(&formpost,
               &lastptr,
               CURLFORM_COPYNAME, "submit",
               CURLFORM_COPYCONTENTS, "send",
               CURLFORM_END);
 
  curl = curl_easy_init();
  multi_handle = curl_multi_init();
 
  /* initalize custom header list (stating that Expect: 100-continue is not
     wanted */ 
  headerlist = curl_slist_append(headerlist, buf);
  if(curl && multi_handle) {
 
    /* what URL that receives this POST */ 
    curl_easy_setopt(curl, CURLOPT_URL,
                     "http://www.fillinyoururl.com/upload.cgi");
    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
 
    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
    curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 
    curl_multi_add_handle(multi_handle, curl);
 
    while(CURLM_CALL_MULTI_PERFORM ==
          curl_multi_perform(multi_handle, &still_running));
 
    while(still_running) {
      struct timeval timeout;
      int rc; /* select() return code */ 
 
      fd_set fdread;
      fd_set fdwrite;
      fd_set fdexcep;
      int maxfd;
 
      FD_ZERO(&fdread);
      FD_ZERO(&fdwrite);
      FD_ZERO(&fdexcep);
 
      /* set a suitable timeout to play around with */ 
      timeout.tv_sec = 1;
      timeout.tv_usec = 0;
 
      /* get file descriptors from the transfers */ 
      curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
 
      /* In a real-world program you OF COURSE check the return code of the
         function calls, *and* you make sure that maxfd is bigger than -1
         so that the call to select() below makes sense! */ 
 
      rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
 
      switch(rc) {
      case -1:
        /* select error */ 
        break;
      case 0:
        printf("timeout!\n");
      default:
        /* timeout or readable/writable sockets */ 
        printf("perform!\n");
        while(CURLM_CALL_MULTI_PERFORM ==
              curl_multi_perform(multi_handle, &still_running));
        printf("running: %d!\n", still_running);
        break;
      }
    }
 
    curl_multi_cleanup(multi_handle);
 
    /* always cleanup */ 
    curl_easy_cleanup(curl);
 
    /* then cleanup the formpost chain */ 
    curl_formfree(formpost);
 
    /* free slist */ 
    curl_slist_free_all (headerlist);
  }
  return 0;
}

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