NAME

       CURLOPT_RESOLVER_START_DATA - custom 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 that will 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, "http://example.com");
         curl_easy_perform(curl);
         curl_easy_cleanup(curl);
       }

AVAILABILITY

       Added in 7.59.0

RETURN VALUE

       Returns CURLE_OK

SEE ALSO

       CURLOPT_RESOLVER_START_FUNCTION(3)