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 CURL-
MOPT_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 >= 0) {
/* this is the new single timeout to wait for */
}
else {
/* delete the timeout, nothing to wait for now */
}
return 0;
}
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 2026-07-12 CURLMOPT_TIMERDATA(3)
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