SSL_get_all_async_fds
if (!SSL_get_all_async_fds(s, NULL, &numfds))
if (!SSL_get_all_async_fds(s, fds, &numfds)) {
__owur int SSL_get_all_async_fds(SSL *s, OSSL_ASYNC_FD *fds, size_t *numfds);