**************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel (at] 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.
*
**************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel (at] 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.
*
**************************************************************************
CURLMOPT_TIMERFUNCTION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_multi_setopt options"
NAME
CURLMOPT_TIMERFUNCTION - set callback to receive timeout values
SYNOPSIS
#include <curl/curl.h> int timer_callback(CURLM *multi, /* multi handle */ long timeout_ms, /* see above */ void *userp); /* private callback pointer */ CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_TIMERFUNCTION, timer_callback);DESCRIPTIONPass 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 timer_callback should install a non-repeating timer with an interval of timeout_ms. Each time that timer fires, call either curl_multi_socket_action(3) or curl_multi_perform(3), depending on which interface you use. A timeout_ms value of -1 means you should delete your timer. A timeout_ms value of 0 means you should call curl_multi_socket_action(3) or curl_multi_perform(3) (once) as soon as possible. timer_callback will only be called when the timeout_ms changes. The userp pointer is set with CURLMOPT_TIMERDATA(3). The timer callback should return 0 on success, and -1 on error. This callback can be used instead of, or in addition to, curl_multi_timeout(3).DEFAULTNULLPROTOCOLSAllEXAMPLEstatic gboolean timeout_cb(gpointer user_data) { if (user_data) { g_free(user_data); curl_multi_setopt(curl_handle, CURLMOPT_TIMERDATA, NULL); } int running; 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);AVAILABILITYAdded in 7.16.0RETURN VALUEReturns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not."SEE ALSO"CURLMOPT_TIMERDATA "(3), " CURLMOPT_SOCKETFUNCTION "(3), "
