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¶

This functionality affects all supported protocols

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;
}
int main(void)
{


  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 curl 7.59.0

RETURN VALUE¶

Returns CURLE_OK

SEE ALSO¶

CURLOPT_PREREQFUNCTION(3), CURLOPT_RESOLVER_START_FUNCTION(3)