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---
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
SPDX-License-Identifier: curl
Title: CURLMOPT_TIMERDATA
Section: 3
Source: libcurl
See-also:
- CURLMOPT_SOCKETFUNCTION (3)
- CURLMOPT_TIMERFUNCTION (3)
---
# NAME
CURLMOPT_TIMERDATA - custom pointer to pass to timer callback
# SYNOPSIS
~~~c
#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
callbacks's **clientp** argument.
# DEFAULT
NULL
# PROTOCOLS
All
# EXAMPLE
~~~c
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 7.16.0
# RETURN VALUE
Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
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