CURLOPT_RESOLVER_START_DATA(3)

NAME
CURLOPT_RESOLVER_START_DATA - pointer passed to the resolver start callback

SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RESOLVER_START_DATA,
                          void *pointer);

DESCRIPTION
Pass a pointer is be untouched by libcurl and passed as the third argument in the resolver start callback set with CURLOPT_RESOLVER_START_FUNCTION(3).

DEFAULT
NULL

PROTOCOLS
All

EXAMPLE
static int resolver_start_cb(void *resolver_state, void *reserved,
                             void *userdata)
{
  (void)reserved;
  printf("Received resolver_state=%p userdata=%p\n",
         resolver_state, userdata);
  return 0;
}
CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_RESOLVER_START_FUNCTION, resolver_start_cb);
  curl_easy_setopt(curl, CURLOPT_RESOLVER_START_DATA, curl);
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
  curl_easy_perform(curl);
  curl_easy_cleanup(curl);
}

AVAILABILITY
Added in 7.59.0

RETURN VALUE
Returns CURLE_OK

SEE ALSO
CURLOPT_PREREQFUNCTION(3), CURLOPT_RESOLVER_START_FUNCTION(3)