neo/curl/docs/examples/multi-post.c

   1 /*****************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * $Id: multi-post.c,v 1.1 2002/05/06 13:38:28 bagder Exp $
   9  *
  10  * This is an example application source code using the multi interface
  11  * to do a multipart formpost without "blocking".
  12  */
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <sys/time.h>
  16
  17 #include <curl/curl.h>
  18
  19 int main(int argc, char *argv[])
  20 {
  21   CURL *curl;
  22   CURLcode res;
  23
  24   CURLM *multi_handle;
  25   int still_running;
  26
  27   struct HttpPost *formpost=NULL;
  28   struct HttpPost *lastptr=NULL;
  29   struct curl_slist *headerlist=NULL;
  30   char buf[] = "Expect:";
  31
  32   /* Fill in the file upload field */
  33   curl_formadd(&formpost,
  34                &lastptr,
  35                CURLFORM_COPYNAME, "sendfile",
  36                CURLFORM_FILE, "postit2.c",
  37                CURLFORM_END);
  38
  39   /* Fill in the filename field */
  40   curl_formadd(&formpost,
  41                &lastptr,
  42                CURLFORM_COPYNAME, "filename",
  43                CURLFORM_COPYCONTENTS, "postit2.c",
  44                CURLFORM_END);
  45
  46
  47   /* Fill in the submit field too, even if this is rarely needed */
  48   curl_formadd(&formpost,
  49                &lastptr,
  50                CURLFORM_COPYNAME, "submit",
  51                CURLFORM_COPYCONTENTS, "send",
  52                CURLFORM_END);
  53
  54   curl = curl_easy_init();
  55   multi_handle = curl_multi_init();
  56
  57   /* initalize custom header list (stating that Expect: 100-continue is not
  58      wanted */
  59   headerlist = curl_slist_append(headerlist, buf);
  60   if(curl && multi_handle) {
  61     int perform=0;
  62
  63     /* what URL that receives this POST */
  64     curl_easy_setopt(curl, CURLOPT_URL,
  65                      "http://www.fillinyoururl.com/upload.cgi");
  66     curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
  67
  68     curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
  69     curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
  70
  71     curl_multi_add_handle(multi_handle, curl);
  72
  73     while(CURLM_CALL_MULTI_PERFORM ==
  74           curl_multi_perform(multi_handle, &still_running));
  75
  76     while(still_running) {
  77       struct timeval timeout;
  78       int rc; /* select() return code */
  79
  80       fd_set fdread;
  81       fd_set fdwrite;
  82       fd_set fdexcep;
  83       int maxfd;
  84
  85       FD_ZERO(&fdread);
  86       FD_ZERO(&fdwrite);
  87       FD_ZERO(&fdexcep);
  88
  89       /* set a suitable timeout to play around with */
  90       timeout.tv_sec = 1;
  91       timeout.tv_usec = 0;
  92
  93       /* get file descriptors from the transfers */
  94       curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
  95
  96       rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
  97
  98       switch(rc) {
  99       case -1:
 100         /* select error */
 101         break;
 102       case 0:
 103         printf("timeout!\n");
 104       default:
 105         /* timeout or readable/writable sockets */
 106         printf("perform!\n");
 107         while(CURLM_CALL_MULTI_PERFORM ==
 108               curl_multi_perform(multi_handle, &still_running));
 109         printf("running: %d!\n", still_running);
 110         break;
 111       }
 112     }
 113
 114     curl_multi_cleanup(multi_handle);
 115
 116     /* always cleanup */
 117     curl_easy_cleanup(curl);
 118
 119     /* then cleanup the formpost chain */
 120     curl_formfree(formpost);
 121
 122     /* free slist */
 123     curl_slist_free_all (headerlist);
 124   }
 125   return 0;
 126 }