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CURLOPT_R...START_DATA(3)  Library Functions Manual  CURLOPT_R...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 argu-
       ment  in	  the	resolver   start   callback   set   with   CURLOPT_RE-
       SOLVER_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
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK	(0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).

SEE ALSO
       CURLOPT_PREREQFUNCTION(3), CURLOPT_RESOLVER_START_FUNCTION(3)

libcurl				  2025-06-03	     CURLOPT_R...START_DATA(3)

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