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10-at-a-time.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <[email protected]>, 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.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
/* <DESC>
* Download many files in parallel, in the same thread.
* </DESC>
*/
#include <stdlib.h>
#include <string.h>
#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, unsigned int i, int *left)
{
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);
(*left)++;
}
int main(void)
{
CURLM *cm;
CURLMsg *msg;
unsigned int transfers = 0;
int msgs_left = -1;
int left = 0;
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 < NUM_URLS;
transfers++)
add_transfer(cm, transfers, &left);
do {
int still_alive = 1;
curl_multi_perform(cm, &still_alive);
/* !checksrc! disable EQUALSNULL 1 */
while((msg = curl_multi_info_read(cm, &msgs_left)) != NULL) {
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);
left--;
}
else {
fprintf(stderr, "E: CURLMsg (%d)\n", msg->msg);
}
if(transfers < NUM_URLS)
add_transfer(cm, transfers++, &left);
}
if(left)
curl_multi_wait(cm, NULL, 0, 1000, NULL);
} while(left);
curl_multi_cleanup(cm);
curl_global_cleanup();
return EXIT_SUCCESS;
}