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Annotation of embedaddon/curl/docs/examples/multi-formadd.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:   struct curl_httppost *formpost = NULL;
                     41:   struct curl_httppost *lastptr = NULL;
                     42:   struct curl_slist *headerlist = NULL;
                     43:   static const char buf[] = "Expect:";
                     44: 
                     45:   /* Fill in the file upload field. This makes libcurl load data from
                     46:      the given file name when curl_easy_perform() is called. */
                     47:   curl_formadd(&formpost,
                     48:                &lastptr,
                     49:                CURLFORM_COPYNAME, "sendfile",
                     50:                CURLFORM_FILE, "postit2.c",
                     51:                CURLFORM_END);
                     52: 
                     53:   /* Fill in the filename field */
                     54:   curl_formadd(&formpost,
                     55:                &lastptr,
                     56:                CURLFORM_COPYNAME, "filename",
                     57:                CURLFORM_COPYCONTENTS, "postit2.c",
                     58:                CURLFORM_END);
                     59: 
                     60:   /* Fill in the submit field too, even if this is rarely needed */
                     61:   curl_formadd(&formpost,
                     62:                &lastptr,
                     63:                CURLFORM_COPYNAME, "submit",
                     64:                CURLFORM_COPYCONTENTS, "send",
                     65:                CURLFORM_END);
                     66: 
                     67:   curl = curl_easy_init();
                     68:   multi_handle = curl_multi_init();
                     69: 
                     70:   /* initialize custom header list (stating that Expect: 100-continue is not
                     71:      wanted */
                     72:   headerlist = curl_slist_append(headerlist, buf);
                     73:   if(curl && multi_handle) {
                     74: 
                     75:     /* what URL that receives this POST */
                     76:     curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/upload.cgi");
                     77:     curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
                     78: 
                     79:     curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
                     80:     curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
                     81: 
                     82:     curl_multi_add_handle(multi_handle, curl);
                     83: 
                     84:     curl_multi_perform(multi_handle, &still_running);
                     85: 
                     86:     while(still_running) {
                     87:       struct timeval timeout;
                     88:       int rc; /* select() return code */
                     89:       CURLMcode mc; /* curl_multi_fdset() return code */
                     90: 
                     91:       fd_set fdread;
                     92:       fd_set fdwrite;
                     93:       fd_set fdexcep;
                     94:       int maxfd = -1;
                     95: 
                     96:       long curl_timeo = -1;
                     97: 
                     98:       FD_ZERO(&fdread);
                     99:       FD_ZERO(&fdwrite);
                    100:       FD_ZERO(&fdexcep);
                    101: 
                    102:       /* set a suitable timeout to play around with */
                    103:       timeout.tv_sec = 1;
                    104:       timeout.tv_usec = 0;
                    105: 
                    106:       curl_multi_timeout(multi_handle, &curl_timeo);
                    107:       if(curl_timeo >= 0) {
                    108:         timeout.tv_sec = curl_timeo / 1000;
                    109:         if(timeout.tv_sec > 1)
                    110:           timeout.tv_sec = 1;
                    111:         else
                    112:           timeout.tv_usec = (curl_timeo % 1000) * 1000;
                    113:       }
                    114: 
                    115:       /* get file descriptors from the transfers */
                    116:       mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
                    117: 
                    118:       if(mc != CURLM_OK) {
                    119:         fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
                    120:         break;
                    121:       }
                    122: 
                    123:       /* On success the value of maxfd is guaranteed to be >= -1. We call
                    124:          select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
                    125:          no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
                    126:          to sleep 100ms, which is the minimum suggested value in the
                    127:          curl_multi_fdset() doc. */
                    128: 
                    129:       if(maxfd == -1) {
                    130: #ifdef _WIN32
                    131:         Sleep(100);
                    132:         rc = 0;
                    133: #else
                    134:         /* Portable sleep for platforms other than Windows. */
                    135:         struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
                    136:         rc = select(0, NULL, NULL, NULL, &wait);
                    137: #endif
                    138:       }
                    139:       else {
                    140:         /* Note that on some platforms 'timeout' may be modified by select().
                    141:            If you need access to the original value save a copy beforehand. */
                    142:         rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
                    143:       }
                    144: 
                    145:       switch(rc) {
                    146:       case -1:
                    147:         /* select error */
                    148:         break;
                    149:       case 0:
                    150:       default:
                    151:         /* timeout or readable/writable sockets */
                    152:         printf("perform!\n");
                    153:         curl_multi_perform(multi_handle, &still_running);
                    154:         printf("running: %d!\n", still_running);
                    155:         break;
                    156:       }
                    157:     }
                    158: 
                    159:     curl_multi_cleanup(multi_handle);
                    160: 
                    161:     /* always cleanup */
                    162:     curl_easy_cleanup(curl);
                    163: 
                    164:     /* then cleanup the formpost chain */
                    165:     curl_formfree(formpost);
                    166: 
                    167:     /* free slist */
                    168:     curl_slist_free_all(headerlist);
                    169:   }
                    170:   return 0;
                    171: }