CURLOPT_RESOLVER_START_DATA(3)                        Library Functions Manual

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;
       }

       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 7.59.0

RETURN VALUE
       Returns CURLE_OK

SEE ALSO
       CURLOPT_PREREQFUNCTION(3), CURLOPT_RESOLVER_START_FUNCTION(3)

libcurl                          April 26 2024  CURLOPT_RESOLVER_START_DATA(3)