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CURLMOPT_TIMERFUNCTION

Section: curl_multi_setopt options (3)
Updated: 17 Jun 2014
Index Return to Main Contents
 

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);
 

DESCRIPTION

Pass a pointer to your callback function, which should match the prototype shown above.

This callback function will be called when the timeout value changes. The timeout_ms value is at what latest time the application should call one of the "performing" functions of the multi interface (curl_multi_socket_action(3) and curl_multi_perform(3)) - to allow libcurl to keep timeouts and retries etc to work. A timeout_ms value of -1 means that there is no timeout at all, and 0 means that the timeout is already expired. libcurl attempts to limit calling this only when the fixed future timeout time actually 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).  

DEFAULT

NULL  

PROTOCOLS

All  

EXAMPLE

TODO  

AVAILABILITY

Added in 7.16.0  

RETURN VALUE

Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.  

SEE ALSO

CURLMOPT_TIMERDATA(3), CURLMOPT_SOCKETFUNCTION(3),


 

Index

NAME
SYNOPSIS
DESCRIPTION
DEFAULT
PROTOCOLS
EXAMPLE
AVAILABILITY
RETURN VALUE
SEE ALSO


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