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/*****************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* $Id$
*
* Example application source code using the multi interface to download many
* files, but with a capped maximum amount of simultaneous transfers.
*
* Written by Michael Wallner
*/
#include <stdlib.h>
#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.sony.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 int 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, 0);
curl_easy_setopt(eh, CURLOPT_URL, urls[i]);
curl_easy_setopt(eh, CURLOPT_PRIVATE, urls[i]);
curl_easy_setopt(eh, CURLOPT_VERBOSE, 0);
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();
for (C = 0; C < MAX; ++C) {
init(cm, C);
}
while (U) {
while (CURLM_CALL_MULTI_PERFORM == 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;
}
/* In a real-world program you OF COURSE check the return that maxfd is
bigger than -1 so that the call to select() below makes sense! */
if (curl_multi_timeout(cm, &L)) {
fprintf(stderr, "E: curl_multi_timeout\n");
return EXIT_FAILURE;
}
T.tv_sec = L/1000;
T.tv_usec = (L%1000)*1000;
if (0 > select(M+1, &R, &W, &E, &T)) {
fprintf(stderr, "E: select\n");
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++);
}
}
}
curl_multi_cleanup(cm);
curl_global_cleanup();
return EXIT_SUCCESS;
}
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