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Annotation of embedaddon/curl/docs/examples/multi-single.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 single download
                     24:  * </DESC>
                     25:  */
                     26: 
                     27: #include <stdio.h>
                     28: #include <string.h>
                     29: 
                     30: /* somewhat unix-specific */
                     31: #include <sys/time.h>
                     32: #include <unistd.h>
                     33: 
                     34: /* curl stuff */
                     35: #include <curl/curl.h>
                     36: 
                     37: #ifdef _WIN32
                     38: #define WAITMS(x) Sleep(x)
                     39: #else
                     40: /* Portable sleep for platforms other than Windows. */
                     41: #define WAITMS(x)                               \
                     42:   struct timeval wait = { 0, (x) * 1000 };      \
                     43:   (void)select(0, NULL, NULL, NULL, &wait);
                     44: #endif
                     45: 
                     46: /*
                     47:  * Simply download a HTTP file.
                     48:  */
                     49: int main(void)
                     50: {
                     51:   CURL *http_handle;
                     52:   CURLM *multi_handle;
                     53: 
                     54:   int still_running = 0; /* keep number of running handles */
                     55:   int repeats = 0;
                     56: 
                     57:   curl_global_init(CURL_GLOBAL_DEFAULT);
                     58: 
                     59:   http_handle = curl_easy_init();
                     60: 
                     61:   /* set the options (I left out a few, you'll get the point anyway) */
                     62:   curl_easy_setopt(http_handle, CURLOPT_URL, "https://www.example.com/");
                     63: 
                     64:   /* init a multi stack */
                     65:   multi_handle = curl_multi_init();
                     66: 
                     67:   /* add the individual transfers */
                     68:   curl_multi_add_handle(multi_handle, http_handle);
                     69: 
                     70:   /* we start some action by calling perform right away */
                     71:   curl_multi_perform(multi_handle, &still_running);
                     72: 
                     73:   while(still_running) {
                     74:     CURLMcode mc; /* curl_multi_wait() return code */
                     75:     int numfds;
                     76: 
                     77:     /* wait for activity, timeout or "nothing" */
                     78:     mc = curl_multi_wait(multi_handle, NULL, 0, 1000, &numfds);
                     79: 
                     80:     if(mc != CURLM_OK) {
                     81:       fprintf(stderr, "curl_multi_wait() failed, code %d.\n", mc);
                     82:       break;
                     83:     }
                     84: 
                     85:     /* 'numfds' being zero means either a timeout or no file descriptors to
                     86:        wait for. Try timeout on first occurrence, then assume no file
                     87:        descriptors and no file descriptors to wait for means wait for 100
                     88:        milliseconds. */
                     89: 
                     90:     if(!numfds) {
                     91:       repeats++; /* count number of repeated zero numfds */
                     92:       if(repeats > 1) {
                     93:         WAITMS(100); /* sleep 100 milliseconds */
                     94:       }
                     95:     }
                     96:     else
                     97:       repeats = 0;
                     98: 
                     99:     curl_multi_perform(multi_handle, &still_running);
                    100:   }
                    101: 
                    102:   curl_multi_remove_handle(multi_handle, http_handle);
                    103: 
                    104:   curl_easy_cleanup(http_handle);
                    105: 
                    106:   curl_multi_cleanup(multi_handle);
                    107: 
                    108:   curl_global_cleanup();
                    109: 
                    110:   return 0;
                    111: }