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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/examples/10-at-a-time.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/docs/examples/10-at-a-time.c b/docs/examples/10-at-a-time.c new file mode 100644 index 000000000..be3b6faee --- /dev/null +++ b/docs/examples/10-at-a-time.c @@ -0,0 +1,163 @@ +/***************************************************************************** + * _ _ ____ _ + * 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; + } + + 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; +} |