Return to multi-post.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / curl / docs / examples

curl

    1: /***************************************************************************
    2:  *                                  _   _ ____  _
    3:  *  Project                     ___| | | |  _ \| |
    4:  *                             / __| | | | |_) | |
    5:  *                            | (__| |_| |  _ <| |___
    6:  *                             \___|\___/|_| \_\_____|
    7:  *
    8:  * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
    9:  *
   10:  * This software is licensed as described in the file COPYING, which
   11:  * you should have received as part of this distribution. The terms
   12:  * are also available at https://curl.haxx.se/docs/copyright.html.
   13:  *
   14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   15:  * copies of the Software, and permit persons to whom the Software is
   16:  * furnished to do so, under the terms of the COPYING file.
   17:  *
   18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   19:  * KIND, either express or implied.
   20:  *
   21:  ***************************************************************************/
   22: /* <DESC>
   23:  * using the multi interface to do a multipart formpost without blocking
   24:  * </DESC>
   25:  */
   26: 
   27: #include <stdio.h>
   28: #include <string.h>
   29: #include <sys/time.h>
   30: 
   31: #include <curl/curl.h>
   32: 
   33: int main(void)
   34: {
   35:   CURL *curl;
   36: 
   37:   CURLM *multi_handle;
   38:   int still_running = 0;
   39: 
   40:   curl_mime *form = NULL;
   41:   curl_mimepart *field = NULL;
   42:   struct curl_slist *headerlist = NULL;
   43:   static const char buf[] = "Expect:";
   44: 
   45:   curl = curl_easy_init();
   46:   multi_handle = curl_multi_init();
   47: 
   48:   if(curl && multi_handle) {
   49:     /* Create the form */
   50:     form = curl_mime_init(curl);
   51: 
   52:     /* Fill in the file upload field */
   53:     field = curl_mime_addpart(form);
   54:     curl_mime_name(field, "sendfile");
   55:     curl_mime_filedata(field, "multi-post.c");
   56: 
   57:     /* Fill in the filename field */
   58:     field = curl_mime_addpart(form);
   59:     curl_mime_name(field, "filename");
   60:     curl_mime_data(field, "multi-post.c", CURL_ZERO_TERMINATED);
   61: 
   62:     /* Fill in the submit field too, even if this is rarely needed */
   63:     field = curl_mime_addpart(form);
   64:     curl_mime_name(field, "submit");
   65:     curl_mime_data(field, "send", CURL_ZERO_TERMINATED);
   66: 
   67:     /* initialize custom header list (stating that Expect: 100-continue is not
   68:        wanted */
   69:     headerlist = curl_slist_append(headerlist, buf);
   70: 
   71:     /* what URL that receives this POST */
   72:     curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/upload.cgi");
   73:     curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
   74: 
   75:     curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
   76:     curl_easy_setopt(curl, CURLOPT_MIMEPOST, form);
   77: 
   78:     curl_multi_add_handle(multi_handle, curl);
   79: 
   80:     curl_multi_perform(multi_handle, &still_running);
   81: 
   82:     while(still_running) {
   83:       struct timeval timeout;
   84:       int rc; /* select() return code */
   85:       CURLMcode mc; /* curl_multi_fdset() return code */
   86: 
   87:       fd_set fdread;
   88:       fd_set fdwrite;
   89:       fd_set fdexcep;
   90:       int maxfd = -1;
   91: 
   92:       long curl_timeo = -1;
   93: 
   94:       FD_ZERO(&fdread);
   95:       FD_ZERO(&fdwrite);
   96:       FD_ZERO(&fdexcep);
   97: 
   98:       /* set a suitable timeout to play around with */
   99:       timeout.tv_sec = 1;
  100:       timeout.tv_usec = 0;
  101: 
  102:       curl_multi_timeout(multi_handle, &curl_timeo);
  103:       if(curl_timeo >= 0) {
  104:         timeout.tv_sec = curl_timeo / 1000;
  105:         if(timeout.tv_sec > 1)
  106:           timeout.tv_sec = 1;
  107:         else
  108:           timeout.tv_usec = (curl_timeo % 1000) * 1000;
  109:       }
  110: 
  111:       /* get file descriptors from the transfers */
  112:       mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
  113: 
  114:       if(mc != CURLM_OK) {
  115:         fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
  116:         break;
  117:       }
  118: 
  119:       /* On success the value of maxfd is guaranteed to be >= -1. We call
  120:          select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
  121:          no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
  122:          to sleep 100ms, which is the minimum suggested value in the
  123:          curl_multi_fdset() doc. */
  124: 
  125:       if(maxfd == -1) {
  126: #ifdef _WIN32
  127:         Sleep(100);
  128:         rc = 0;
  129: #else
  130:         /* Portable sleep for platforms other than Windows. */
  131:         struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
  132:         rc = select(0, NULL, NULL, NULL, &wait);
  133: #endif
  134:       }
  135:       else {
  136:         /* Note that on some platforms 'timeout' may be modified by select().
  137:            If you need access to the original value save a copy beforehand. */
  138:         rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
  139:       }
  140: 
  141:       switch(rc) {
  142:       case -1:
  143:         /* select error */
  144:         break;
  145:       case 0:
  146:       default:
  147:         /* timeout or readable/writable sockets */
  148:         printf("perform!\n");
  149:         curl_multi_perform(multi_handle, &still_running);
  150:         printf("running: %d!\n", still_running);
  151:         break;
  152:       }
  153:     }
  154: 
  155:     curl_multi_cleanup(multi_handle);
  156: 
  157:     /* always cleanup */
  158:     curl_easy_cleanup(curl);
  159: 
  160:     /* then cleanup the form */
  161:     curl_mime_free(form);
  162: 
  163:     /* free slist */
  164:     curl_slist_free_all(headerlist);
  165:   }
  166:   return 0;
  167: }