curl / libcurl / API / curl_multi_setopt / CURLMOPT_TIMERDATA

CURLMOPT_TIMERDATA explained

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 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.