CURLOPT_SEEKDATA - custom pointer passed to the seek callback
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SEEKDATA, void *pointer);
Data pointer to pass to the seek callback function. If you use the CURLOPT_SEEKFUNCTION option, this is the pointer you'll get as input.
If you don't set this, NULL is passed to the callback.
CURLOPT_STDERR CURLOPT_DEBUGFUNCTION
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