.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
-.\" * Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2016, 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 http://curl.haxx.se/docs/copyright.html.
+.\" * 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
int *numfds);
.ad
.SH DESCRIPTION
-This function polls on all file descriptors used by the curl easy handles
-contained in the given multi handle set. It will block until activity is
-detected on at least one of the handles or \fItimeout_ms\fP has passed.
+\fIcurl_multi_wait(3)\fP polls all file descriptors used by the curl easy
+handles contained in the given multi handle set. It will block until activity
+is detected on at least one of the handles or \fItimeout_ms\fP has passed.
Alternatively, if the multi handle has a pending internal timeout that has a
shorter expiry time than \fItimeout_ms\fP, that shorter time will be used
instead to make sure timeout accuracy is reasonably kept.
The calling application may pass additional curl_waitfd structures which are
similar to \fIpoll(2)\fP's pollfd structure to be waited on in the same call.
-On completion, if \fInumfds\fP is supplied, it will be populated with the
-total number of file descriptors on which interesting events occured. This
+On completion, if \fInumfds\fP is non-NULL, it will be populated with the
+total number of file descriptors on which interesting events occurred. This
number can include both libcurl internal descriptors as well as descriptors
provided in \fIextra_fds\fP.
.IP CURL_WAIT_POLLOUT
Bit flag to curl_waitfd.events indicating the socket should poll on write
events such as the socket being clear to write without blocking.
+.SH EXAMPLE
+.nf
+CURL *easy_handle;
+CURLM *multi_handle;
+
+/* add the individual easy handle */
+curl_multi_add_handle(multi_handle, easy_handle);
+
+do {
+ CURLMcode mc;
+ int numfds;
+
+ mc = curl_multi_perform(multi_handle, &still_running);
+
+ if(mc == CURLM_OK ) {
+ /* wait for activity, timeout or "nothing" */
+ mc = curl_multi_wait(multi_handle, NULL, 0, 1000, &numfds);
+ }
+
+ if(mc != CURLM_OK) {
+ fprintf(stderr, "curl_multi failed, code %d.\n", mc);
+ break;
+ }
+
+ /* 'numfds' being zero means either a timeout or no file descriptors to
+ wait for. Try timeout on first occurrence, then assume no file
+ descriptors and no file descriptors to wait for means wait for 100
+ milliseconds. */
+
+ if(!numfds) {
+ repeats++; /* count number of repeated zero numfds */
+ if(repeats > 1) {
+ WAITMS(100); /* sleep 100 milliseconds */
+ }
+ }
+ else
+ repeats = 0;
+
+} while(still_running);
+
+curl_multi_remove_handle(multi_handle, easy_handle);
+.fi
.SH RETURN VALUE
CURLMcode type, general libcurl multi interface error code. See
\fIlibcurl-errors(3)\fP