CURLOPT_READDATA - custom pointer passed to the read callback
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_READDATA, void *pointer);
Data pointer to pass to the file read function. If you use the CURLOPT_READFUNCTION option, this is the pointer you'll get as input in the 4th argument to the callback.
If you don't specify a read callback but instead rely on the default internal read function, this data must be a valid readable FILE * (cast to 'void *').
If you're using libcurl as a win32 DLL, you MUST use a CURLOPT_READFUNCTION if you set this option.
By default, this is a FILE * to stdin.
This is used for all protocols when sending data.
This option was once known by the older name CURLOPT_INFILE, the name CURLOPT_READDATA was introduced in 7.9.7.
CURLOPT_READFUNCTION CURLOPT_WRITEDATA
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