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authorDaniel Stenberg <daniel@haxx.se>2019-11-14 18:43:49 +0100
committerDaniel Stenberg <daniel@haxx.se>2019-11-14 23:24:00 +0100
commitea19dbe66237749ed8cdf6726a377a43be1c9e59 (patch)
treead7bd84433144efae3caaff66bb3367ef1dfdee8 /docs/examples
parent4e1eee1500202a6a21fbedbd6e84d0e6c9af4b50 (diff)
examples: add multi-poll.c
Show how curl_multi_poll() makes it even easier to use the multi interface. Closes #4596
Diffstat (limited to 'docs/examples')
-rw-r--r--docs/examples/Makefile.inc2
-rw-r--r--docs/examples/multi-poll.c76
2 files changed, 77 insertions, 1 deletions
diff --git a/docs/examples/Makefile.inc b/docs/examples/Makefile.inc
index f03fcf2f0..b588b5fee 100644
--- a/docs/examples/Makefile.inc
+++ b/docs/examples/Makefile.inc
@@ -36,7 +36,7 @@ check_PROGRAMS = 10-at-a-time anyauthput cookie_interface debug fileupload \
ftpuploadresume sslbackend postit2-formadd multi-formadd \
shared-connection-cache sftpuploadresume http2-pushinmemory parseurl \
urlapi imap-authzid pop3-authzid smtp-authzid http3 altsvc \
- http3-present
+ http3-present multi-poll
# These examples require external dependencies that may not be commonly
# available on POSIX systems, so don't bother attempting to compile them here.
diff --git a/docs/examples/multi-poll.c b/docs/examples/multi-poll.c
new file mode 100644
index 000000000..255a3d45b
--- /dev/null
+++ b/docs/examples/multi-poll.c
@@ -0,0 +1,76 @@
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2019, 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>
+ * single download with the multi interface's curl_multi_poll
+ * </DESC>
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+/* somewhat unix-specific */
+#include <sys/time.h>
+#include <unistd.h>
+
+/* curl stuff */
+#include <curl/curl.h>
+
+int main(void)
+{
+ CURL *http_handle;
+ CURLM *multi_handle;
+ int still_running = 1; /* keep number of running handles */
+
+ curl_global_init(CURL_GLOBAL_DEFAULT);
+
+ http_handle = curl_easy_init();
+
+ curl_easy_setopt(http_handle, CURLOPT_URL, "https://www.example.com/");
+
+ multi_handle = curl_multi_init();
+
+ curl_multi_add_handle(multi_handle, http_handle);
+
+ while(still_running) {
+ CURLMcode mc; /* curl_multi_poll() return code */
+ int numfds;
+
+ /* we start some action by calling perform right away */
+ mc = curl_multi_perform(multi_handle, &still_running);
+
+ if(still_running)
+ /* wait for activity, timeout or "nothing" */
+ mc = curl_multi_poll(multi_handle, NULL, 0, 1000, &numfds);
+
+ if(mc != CURLM_OK) {
+ fprintf(stderr, "curl_multi_wait() failed, code %d.\n", mc);
+ break;
+ }
+ }
+
+ curl_multi_remove_handle(multi_handle, http_handle);
+ curl_easy_cleanup(http_handle);
+ curl_multi_cleanup(multi_handle);
+ curl_global_cleanup();
+
+ return 0;
+}