**************************************************************************
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* Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
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* This software is licensed as described in the file COPYING, which
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**************************************************************************

CURLOPT_DEBUGDATA - custom pointer for 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 https://curl.haxx.se/libcurl/c/debug.html Always Returns CURLE_OK CURLOPT_STDERR "(3), " CURLOPT_DEBUGFUNCTION "(3), "