CURLMOPT_NOTIFYDATA - Man Page

custom pointer passed to the notification callback

Synopsis

#include <curl/curl.h>

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

Description

A data pointer to pass to the notification callback set with the CURLMOPT_NOTIFYFUNCTION(3) option.

This pointer is not touched by libcurl but is only passed in as the notification callback's clientp argument.

Default

NULL

Protocols

This functionality affects all supported protocols

Example

struct priv {
  void *ours;
};

static void notify_cb(CURLM *multi, unsigned int notification,
                      CURL *easy, void *notifyp)
{
  struct priv *p = notifyp;
  printf("my ptr: %p\n", p->ours);
  /* ... */
}

int main(void)
{
  struct priv setup;
  CURLM *multi = curl_multi_init();
  /* ... use socket callback and custom pointer */
  curl_multi_setopt(multi, CURLMOPT_NOTIFYFUNCTION, notify_cb);
  curl_multi_setopt(multi, CURLMOPT_NOTIFYDATA, &setup);
  curl_multi_notify_enable(multi, CURLMNOTIFY_INFO_READ);
}