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23 .TH CURLMOPT_TIMERFUNCTION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_multi_setopt options"
25 CURLMOPT_TIMERFUNCTION \- set callback to receive timeout values
28 #include <curl/curl.h>
30 int timer_callback(CURLM *multi, /* multi handle */
31 long timeout_ms, /* see above */
32 void *userp); /* private callback pointer */
34 CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_TIMERFUNCTION, timer_callback);
36 Pass a pointer to your callback function, which should match the prototype
39 This callback function will be called when the timeout value changes. The
40 \fBtimeout_ms\fP value is at what latest time the application should call one
41 of the \&"performing" functions of the multi interface
42 (\fIcurl_multi_socket_action(3)\fP and \fIcurl_multi_perform(3)\fP) - to allow
43 libcurl to keep timeouts and retries etc to work. A \fBtimeout_ms\fP value of
44 -1 means that there is no timeout at all, and 0 means that the timeout is
45 already expired. libcurl attempts to limit calling this only when the fixed
46 future timeout time actually changes.
48 The \fBuserp\fP pointer is set with \fICURLMOPT_TIMERDATA(3)\fP.
50 The timer callback should return 0 on success, and -1 on error. This callback
51 can be used instead of, or in addition to, \fIcurl_multi_timeout(3)\fP.
61 Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
63 .BR CURLMOPT_TIMERDATA "(3), " CURLMOPT_SOCKETFUNCTION "(3), "