**************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
**************************************************************************

CURLOPT_DEBUGDATA - pointer passed to the debug callback #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DEBUGDATA, void *pointer); Pass a pointer to whatever you want passed in to your CURLOPT_DEBUGFUNCTION(3) in the last void * argument. This pointer is not used by libcurl, it is only passed to the callback. NULL All

int main(void)
{
 CURL *curl;
 CURLcode res;
 struct data my_tracedata;

 curl = curl_easy_init();
 if(curl) {
 curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, my_trace);

 curl_easy_setopt(curl, CURLOPT_DEBUGDATA, &my_tracedata);

 /* the DEBUGFUNCTION has no effect until we enable VERBOSE */
 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);

 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
 res = curl_easy_perform(curl);

 /* always cleanup */
 curl_easy_cleanup(curl);
 }
 return 0;
}

Always Returns CURLE_OK CURLOPT_STDERR "(3), " CURLOPT_DEBUGFUNCTION "(3), "