---
name: "CURLMOPT_TIMERDATA"
section: "3"
platform: "macos"
package: "curl"
version: "166.0.0.0.1"
release: "macOS 26.5"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLMOPT_TIMERDATA"
---

# CURLMOPT\_TIMERDATA(3)

custom pointer to pass to timer callback

## 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)](/CURLMOPT_TIMERFUNCTION/3.md)* 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

```
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.

## SEE ALSO

[**CURLMOPT\_SOCKETFUNCTION**(3)](/CURLMOPT_SOCKETFUNCTION/3.md), [**CURLMOPT\_TIMERFUNCTION**(3)](/CURLMOPT_TIMERFUNCTION/3.md)