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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2017, 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.haxx.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>
* Source code using the multi interface to download many
* files, with a capped maximum amount of simultaneous transfers.
* </DESC>
* Written by Michael Wallner
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#ifndef WIN32
# include <unistd.h>
#endif
#include <curl/multi.h>
static const char *urls[] = {
"http://www.microsoft.com",
"http://www.opensource.org",
"http://www.google.com",
"http://www.yahoo.com",
"http://www.ibm.com",
"http://www.mysql.com",
"http://www.oracle.com",
"http://www.ripe.net",
"http://www.iana.org",
"http://www.amazon.com",
"http://www.netcraft.com",
"http://www.heise.de",
"http://www.chip.de",
"http://www.ca.com",
"http://www.cnet.com",
"http://www.news.com",
"http://www.cnn.com",
"http://www.wikipedia.org",
"http://www.dell.com",
"http://www.hp.com",
"http://www.cert.org",
"http://www.mit.edu",
"http://www.nist.gov",
"http://www.ebay.com",
"http://www.playstation.com",
"http://www.uefa.com",
"http://www.ieee.org",
"http://www.apple.com",
"http://www.symantec.com",
"http://www.zdnet.com",
"http://www.fujitsu.com",
"http://www.supermicro.com",
"http://www.hotmail.com",
"http://www.ecma.com",
"http://www.bbc.co.uk",
"http://news.google.com",
"http://www.foxnews.com",
"http://www.msn.com",
"http://www.wired.com",
"http://www.sky.com",
"http://www.usatoday.com",
"http://www.cbs.com",
"http://www.nbc.com",
"http://slashdot.org",
"http://www.bloglines.com",
"http://www.techweb.com",
"http://www.newslink.org",
"http://www.un.org",
};
#define MAX 10 /* number of simultaneous transfers */
#define CNT sizeof(urls)/sizeof(char *) /* total number of transfers to do */
static size_t cb(char *d, size_t n, size_t l, void *p)
{
/* take care of the data here, ignored in this example */
(void)d;
(void)p;
return n*l;
}
static void init(CURLM *cm, int i)
{
CURL *eh = curl_easy_init();
curl_easy_setopt(eh, CURLOPT_WRITEFUNCTION, cb);
curl_easy_setopt(eh, CURLOPT_HEADER, 0L);
curl_easy_setopt(eh, CURLOPT_URL, urls[i]);
curl_easy_setopt(eh, CURLOPT_PRIVATE, urls[i]);
curl_easy_setopt(eh, CURLOPT_VERBOSE, 0L);
curl_multi_add_handle(cm, eh);
}
int main(void)
{
CURLM *cm;
CURLMsg *msg;
long L;
unsigned int C = 0;
int M, Q, U = -1;
fd_set R, W, E;
struct timeval T;
curl_global_init(CURL_GLOBAL_ALL);
cm = curl_multi_init();
/* we can optionally limit the total amount of connections this multi handle
uses */
curl_multi_setopt(cm, CURLMOPT_MAXCONNECTS, (long)MAX);
for(C = 0; C < MAX; ++C) {
init(cm, C);
}
while(U) {
curl_multi_perform(cm, &U);
if(U) {
FD_ZERO(&R);
FD_ZERO(&W);
FD_ZERO(&E);
if(curl_multi_fdset(cm, &R, &W, &E, &M)) {
fprintf(stderr, "E: curl_multi_fdset\n");
return EXIT_FAILURE;
}
if(curl_multi_timeout(cm, &L)) {
fprintf(stderr, "E: curl_multi_timeout\n");
return EXIT_FAILURE;
}
if(L == -1)
L = 100;
if(M == -1) {
#ifdef WIN32
Sleep(L);
#else
sleep((unsigned int)L / 1000);
#endif
}
else {
T.tv_sec = L/1000;
T.tv_usec = (L%1000)*1000;
if(0 > select(M + 1, &R, &W, &E, &T)) {
fprintf(stderr, "E: select(%i,,,,%li): %i: %s\n",
M + 1, L, errno, strerror(errno));
return EXIT_FAILURE;
}
}
}
while((msg = curl_multi_info_read(cm, &Q))) {
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(C < CNT) {
init(cm, C++);
U++; /* just to prevent it from remaining at 0 if there are more
URLs to get */
}
}
}
curl_multi_cleanup(cm);
curl_global_cleanup();
return EXIT_SUCCESS;
}
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