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Annotation of embedaddon/curl/docs/examples/multi-single.c, revision 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: }