Return to 10-at-a-time.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / curl / docs / examples

Annotation of embedaddon/curl/docs/examples/10-at-a-time.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 1998 - 2019, 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:  * Download many files in parallel, in the same thread.
        !            24:  * </DESC>
        !            25:  */
        !            26: 
        !            27: #include <errno.h>
        !            28: #include <stdlib.h>
        !            29: #include <string.h>
        !            30: #ifndef WIN32
        !            31: #  include <unistd.h>
        !            32: #endif
        !            33: #include <curl/curl.h>
        !            34: 
        !            35: static const char *urls[] = {
        !            36:   "https://www.microsoft.com",
        !            37:   "https://opensource.org",
        !            38:   "https://www.google.com",
        !            39:   "https://www.yahoo.com",
        !            40:   "https://www.ibm.com",
        !            41:   "https://www.mysql.com",
        !            42:   "https://www.oracle.com",
        !            43:   "https://www.ripe.net",
        !            44:   "https://www.iana.org",
        !            45:   "https://www.amazon.com",
        !            46:   "https://www.netcraft.com",
        !            47:   "https://www.heise.de",
        !            48:   "https://www.chip.de",
        !            49:   "https://www.ca.com",
        !            50:   "https://www.cnet.com",
        !            51:   "https://www.mozilla.org",
        !            52:   "https://www.cnn.com",
        !            53:   "https://www.wikipedia.org",
        !            54:   "https://www.dell.com",
        !            55:   "https://www.hp.com",
        !            56:   "https://www.cert.org",
        !            57:   "https://www.mit.edu",
        !            58:   "https://www.nist.gov",
        !            59:   "https://www.ebay.com",
        !            60:   "https://www.playstation.com",
        !            61:   "https://www.uefa.com",
        !            62:   "https://www.ieee.org",
        !            63:   "https://www.apple.com",
        !            64:   "https://www.symantec.com",
        !            65:   "https://www.zdnet.com",
        !            66:   "https://www.fujitsu.com/global/",
        !            67:   "https://www.supermicro.com",
        !            68:   "https://www.hotmail.com",
        !            69:   "https://www.ietf.org",
        !            70:   "https://www.bbc.co.uk",
        !            71:   "https://news.google.com",
        !            72:   "https://www.foxnews.com",
        !            73:   "https://www.msn.com",
        !            74:   "https://www.wired.com",
        !            75:   "https://www.sky.com",
        !            76:   "https://www.usatoday.com",
        !            77:   "https://www.cbs.com",
        !            78:   "https://www.nbc.com/",
        !            79:   "https://slashdot.org",
        !            80:   "https://www.informationweek.com",
        !            81:   "https://apache.org",
        !            82:   "https://www.un.org",
        !            83: };
        !            84: 
        !            85: #define MAX_PARALLEL 10 /* number of simultaneous transfers */
        !            86: #define NUM_URLS sizeof(urls)/sizeof(char *)
        !            87: 
        !            88: static size_t write_cb(char *data, size_t n, size_t l, void *userp)
        !            89: {
        !            90:   /* take care of the data here, ignored in this example */
        !            91:   (void)data;
        !            92:   (void)userp;
        !            93:   return n*l;
        !            94: }
        !            95: 
        !            96: static void add_transfer(CURLM *cm, int i)
        !            97: {
        !            98:   CURL *eh = curl_easy_init();
        !            99:   curl_easy_setopt(eh, CURLOPT_WRITEFUNCTION, write_cb);
        !           100:   curl_easy_setopt(eh, CURLOPT_URL, urls[i]);
        !           101:   curl_easy_setopt(eh, CURLOPT_PRIVATE, urls[i]);
        !           102:   curl_multi_add_handle(cm, eh);
        !           103: }
        !           104: 
        !           105: int main(void)
        !           106: {
        !           107:   CURLM *cm;
        !           108:   CURLMsg *msg;
        !           109:   unsigned int transfers = 0;
        !           110:   int msgs_left = -1;
        !           111:   int still_alive = 1;
        !           112: 
        !           113:   curl_global_init(CURL_GLOBAL_ALL);
        !           114:   cm = curl_multi_init();
        !           115: 
        !           116:   /* Limit the amount of simultaneous connections curl should allow: */
        !           117:   curl_multi_setopt(cm, CURLMOPT_MAXCONNECTS, (long)MAX_PARALLEL);
        !           118: 
        !           119:   for(transfers = 0; transfers < MAX_PARALLEL; transfers++)
        !           120:     add_transfer(cm, transfers);
        !           121: 
        !           122:   do {
        !           123:     curl_multi_perform(cm, &still_alive);
        !           124: 
        !           125:     while((msg = curl_multi_info_read(cm, &msgs_left))) {
        !           126:       if(msg->msg == CURLMSG_DONE) {
        !           127:         char *url;
        !           128:         CURL *e = msg->easy_handle;
        !           129:         curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, &url);
        !           130:         fprintf(stderr, "R: %d - %s <%s>\n",
        !           131:                 msg->data.result, curl_easy_strerror(msg->data.result), url);
        !           132:         curl_multi_remove_handle(cm, e);
        !           133:         curl_easy_cleanup(e);
        !           134:       }
        !           135:       else {
        !           136:         fprintf(stderr, "E: CURLMsg (%d)\n", msg->msg);
        !           137:       }
        !           138:       if(transfers < NUM_URLS)
        !           139:         add_transfer(cm, transfers++);
        !           140:     }
        !           141:     if(still_alive)
        !           142:       curl_multi_wait(cm, NULL, 0, 1000, NULL);
        !           143: 
        !           144:   } while(still_alive || (transfers < NUM_URLS));
        !           145: 
        !           146:   curl_multi_cleanup(cm);
        !           147:   curl_global_cleanup();
        !           148: 
        !           149:   return EXIT_SUCCESS;
        !           150: }