curl_easy_cleanup(3) -- Linux man page
NAMEcurl_easy_cleanup - End a libcurl easy session
void curl_easy_cleanup(CURL *handle);
DESCRIPTIONThis function must be the last function to call for an easy session. It is the opposite of the curl_easy_init(3) function and must be called with the same handle as input that the curl_easy_init call returned.
This will effectively close all connections this handle has used and possibly has kept open until now. Don't call this function if you intend to transfer more files.