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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  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.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLMOPT_TIMERFUNCTION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_multi_setopt options"
+.SH NAME
+CURLMOPT_TIMERFUNCTION \- set callback to receive timeout values
+.SH SYNOPSIS
+.nf
+#include <curl/curl.h>
+
+int timer_callback(CURLM *multi,    /* multi handle */
+                   long timeout_ms, /* timeout in number of ms */
+                   void *userp);    /* private callback pointer */
+
+CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_TIMERFUNCTION, timer_callback);
+.SH DESCRIPTION
+Pass a pointer to your callback function, which should match the prototype
+shown above.
+
+Certain features, such as timeouts and retries, require you to call libcurl
+even when there is no activity on the file descriptors.
+
+Your callback function \fBtimer_callback\fP should install a non-repeating
+timer with an interval of \fBtimeout_ms\fP. When time that timer fires, call
+either \fIcurl_multi_socket_action(3)\fP or \fIcurl_multi_perform(3)\fP,
+depending on which interface you use.
+
+A \fBtimeout_ms\fP value of -1 passed to this callback means you should delete
+the timer. All other values are valid expire times in number of milliseconds.
+
+The \fBtimer_callback\fP will only be called when the timeout expire time is
+changed.
+
+The \fBuserp\fP pointer is set with \fICURLMOPT_TIMERDATA(3)\fP.
+
+The timer callback should return 0 on success, and -1 on error. This callback
+can be used instead of, or in addition to, \fIcurl_multi_timeout(3)\fP.
+
+\fBWARNING:\fP even if it feels tempting, avoid calling libcurl directly from
+within the callback itself when the \fBtimeout_ms\fP value is zero, since it
+risks triggering an unpleasant recursive behavior that immediately calls
+another call to the callback with a zero timeout...
+.SH DEFAULT
+NULL
+.SH PROTOCOLS
+All
+.SH EXAMPLE
+.nf
+static gboolean timeout_cb(gpointer user_data)
+{
+  int running;
+  if(user_data) {
+    g_free(user_data);
+    curl_multi_setopt(curl_handle, CURLMOPT_TIMERDATA, NULL);
+  }
+  curl_multi_socket_action(multi, CURL_SOCKET_TIMEOUT, 0, &running);
+  return G_SOURCE_REMOVE;
+}
+
+static int timerfunc(CURLM *multi, long timeout_ms, void *userp)
+{
+  guint *id = userp;
+
+  if(id)
+    g_source_remove(*id);
+
+  /* -1 means we should just delete our timer. */
+  if(timeout_ms == -1) {
+    g_free(id);
+    id = NULL;
+  }
+  else {
+    if(!id)
+      id = g_new(guint, 1);
+    *id = g_timeout_add(timeout_ms, timeout_cb, id);
+  }
+  curl_multi_setopt(multi, CURLMOPT_TIMERDATA, id);
+  return 0;
+}
+
+curl_multi_setopt(multi, CURLMOPT_TIMERFUNCTION, timerfunc);
+.fi
+.SH AVAILABILITY
+Added in 7.16.0
+.SH RETURN VALUE
+Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
+.SH "SEE ALSO"
+.BR CURLMOPT_TIMERDATA "(3), " CURLMOPT_SOCKETFUNCTION "(3), "