CURLINFO_COOKIELIST man page
CURLINFO_COOKIELIST — get all known cookies
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_COOKIELIST,
struct curl_slist **cookies);
Pass a pointer to a 'struct curl_slist *' to receive a linked-list of all cookies curl knows (expired ones, too). Don't forget to call curl_slist_free_all(3) on the list after it has been used. If there are no cookies (cookies for the handle have not been enabled or simply none have been received) 'struct curl_slist *' will be set to point to NULL.
Since 7.43.0 cookies that were imported in the Set-Cookie format without a domain name are not exported by this option.
Added in 7.14.1
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
curl_easy_getinfo(3), curl_easy_setopt(3), CURLOPT_COOKIELIST(3),