2014-11-03 17:11:37 -05:00
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.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at http://curl.haxx.se/docs/copyright.html.
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.\" **************************************************************************
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.\"
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.TH CURLMOPT_TIMERFUNCTION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_multi_setopt options"
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.SH NAME
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CURLMOPT_TIMERFUNCTION \- set callback to receive timeout values
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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int timer_callback(CURLM *multi, /* multi handle */
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long timeout_ms, /* see above */
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void *userp); /* private callback pointer */
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2014-11-04 04:31:24 -05:00
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CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_TIMERFUNCTION, timer_callback);
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2014-11-03 17:11:37 -05:00
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.SH DESCRIPTION
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Pass a pointer to your callback function, which should match the prototype
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shown above.
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This callback function will be called when the timeout value changes. The
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\fBtimeout_ms\fP value is at what latest time the application should call one
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of the \&"performing" functions of the multi interface
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(\fIcurl_multi_socket_action(3)\fP and \fIcurl_multi_perform(3)\fP) - to allow
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libcurl to keep timeouts and retries etc to work. A \fBtimeout_ms\fP value of
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-1 means that there is no timeout at all, and 0 means that the timeout is
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already expired. libcurl attempts to limit calling this only when the fixed
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future timeout time actually changes.
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The \fBuserp\fP pointer is set with \fICURLMOPT_TIMERDATA(3)\fP.
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The timer callback should return 0 on success, and -1 on error. This callback
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can be used instead of, or in addition to, \fIcurl_multi_timeout(3)\fP.
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.SH DEFAULT
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NULL
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.SH PROTOCOLS
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All
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.SH EXAMPLE
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TODO
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.SH AVAILABILITY
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Added in 7.16.0
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.SH RETURN VALUE
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Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLMOPT_TIMERDATA "(3), " CURLMOPT_SOCKETFUNCTION "(3), "
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