CURLOPT_XFERINFODATA (3) Linux Manual Page
CURLOPT_XFERINFODATA – custom pointer passed to the progress callback
Synopsis
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_XFERINFODATA, void *pointer);
Description
Pass a pointer that will be untouched by libcurl and passed as the first argument in the progress callback set with CURLOPT_XFERINFOFUNCTION(3).
This is an alias for CURLOPT_PROGRESSDATA(3).
Default
The default value of this parameter is NULL.
Protocols
All
Example
http://curl.haxx.se/libcurl/c/progressfunc.html
Availability
Added in 7.32.0
Return Value
Returns CURLE_OK