CURLOPT_OPENSOCKETDATA - custom pointer passed to open socket callback
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_OPENSOCKETDATA, void *pointer);
Pass a pointer that will be untouched by libcurl and passed as the first argument in the opensocket callback set with CURLOPT_OPENSOCKETFUNCTION.
The default value of this parameter is NULL.
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
CURLOPT_OPENSOCKETFUNCTION CURLOPT_SOCKOPTFUNCTION
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