CURLMOPT_TIMERDATA(3)      Library Functions Manual      CURLMOPT_TIMERDATA(3)

NAME
       CURLMOPT_TIMERDATA - custom pointer to pass to timer callback

SYNOPSIS
       #include <curl/curl.h>

       CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_TIMERDATA, void *pointer);

DESCRIPTION
       A data pointer to pass to the timer callback set with the
       CURLMOPT_TIMERFUNCTION(3) option.

       This pointer is not touched by libcurl but is only be passed in to the
       timer callback's clientp argument.

DEFAULT
       NULL

PROTOCOLS
       This functionality affects all supported protocols

EXAMPLE
       struct priv {
         void *custom;
       };

       static int timerfunc(CURLM *multi, long timeout_ms, void *clientp)
       {
        struct priv *mydata = clientp;
        printf("our ptr: %p\n", mydata->custom);

        if(timeout_ms) {
          /* this is the new single timeout to wait for */
        }
        else {
          /* delete the timeout, nothing to wait for now */
        }
       }

       int main(void)
       {
         struct priv mydata;
         CURLM *multi = curl_multi_init();
         curl_multi_setopt(multi, CURLMOPT_TIMERFUNCTION, timerfunc);
         curl_multi_setopt(multi, CURLMOPT_TIMERDATA, &mydata);
       }

AVAILABILITY
       Added in curl 7.16.0

RETURN VALUE
       curl_multi_setopt(3) returns a CURLMcode indicating success or error.

       CURLM_OK (0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).

SEE ALSO
       CURLMOPT_SOCKETFUNCTION(3), CURLMOPT_TIMERFUNCTION(3)

libcurl                           2025-04-10             CURLMOPT_TIMERDATA(3)