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Annotation of embedaddon/curl/docs/examples/multi-post.c, revision 1.1.1.1

1.1       misho       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: }