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10-at-a-time.c
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/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at https://curl.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ***************************************************************************/ /* <DESC> * Download many files in parallel, in the same thread. * </DESC> */ #include <errno.h> #include <stdlib.h> #include <string.h> #ifndef WIN32 # include <unistd.h> #endif #include <curl/curl.h> static const char *urls[] = { "https://www.microsoft.com", "https://opensource.org", "https://www.google.com", "https://www.yahoo.com", "https://www.ibm.com", "https://www.mysql.com", "https://www.oracle.com", "https://www.ripe.net", "https://www.iana.org", "https://www.amazon.com", "https://www.netcraft.com", "https://www.heise.de", "https://www.chip.de", "https://www.ca.com", "https://www.cnet.com", "https://www.mozilla.org", "https://www.cnn.com", "https://www.wikipedia.org", "https://www.dell.com", "https://www.hp.com", "https://www.cert.org", "https://www.mit.edu", "https://www.nist.gov", "https://www.ebay.com", "https://www.playstation.com", "https://www.uefa.com", "https://www.ieee.org", "https://www.apple.com", "https://www.symantec.com", "https://www.zdnet.com", "https://www.fujitsu.com/global/", "https://www.supermicro.com", "https://www.hotmail.com", "https://www.ietf.org", "https://www.bbc.co.uk", "https://news.google.com", "https://www.foxnews.com", "https://www.msn.com", "https://www.wired.com", "https://www.sky.com", "https://www.usatoday.com", "https://www.cbs.com", "https://www.nbc.com/", "https://slashdot.org", "https://www.informationweek.com", "https://apache.org", "https://www.un.org", }; #define MAX_PARALLEL 10 /* number of simultaneous transfers */ #define NUM_URLS sizeof(urls)/sizeof(char *) static size_t write_cb(char *data, size_t n, size_t l, void *userp) { /* take care of the data here, ignored in this example */ (void)data; (void)userp; return n*l; } static void add_transfer(CURLM *cm, int i) { CURL *eh = curl_easy_init(); curl_easy_setopt(eh, CURLOPT_WRITEFUNCTION, write_cb); curl_easy_setopt(eh, CURLOPT_URL, urls[i]); curl_easy_setopt(eh, CURLOPT_PRIVATE, urls[i]); curl_multi_add_handle(cm, eh); } int main(void) { CURLM *cm; CURLMsg *msg; unsigned int transfers = 0; int msgs_left = -1; int still_alive = 1; curl_global_init(CURL_GLOBAL_ALL); cm = curl_multi_init(); /* Limit the amount of simultaneous connections curl should allow: */ curl_multi_setopt(cm, CURLMOPT_MAXCONNECTS, (long)MAX_PARALLEL); for(transfers = 0; transfers < MAX_PARALLEL; transfers++) add_transfer(cm, transfers); do { curl_multi_perform(cm, &still_alive); while((msg = curl_multi_info_read(cm, &msgs_left))) { if(msg->msg == CURLMSG_DONE) { char *url; CURL *e = msg->easy_handle; curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, &url); fprintf(stderr, "R: %d - %s <%s>\n", msg->data.result, curl_easy_strerror(msg->data.result), url); curl_multi_remove_handle(cm, e); curl_easy_cleanup(e); } else { fprintf(stderr, "E: CURLMsg (%d)\n", msg->msg); } if(transfers < NUM_URLS) add_transfer(cm, transfers++); } if(still_alive) curl_multi_wait(cm, NULL, 0, 1000, NULL); } while(still_alive || (transfers < NUM_URLS)); curl_multi_cleanup(cm); curl_global_cleanup(); return EXIT_SUCCESS; }