__sk_stream_is_writeable
return __sk_stream_is_writeable(sk, 0);
if (__sk_stream_is_writeable(sk, 1) && sock) {
if (__sk_stream_is_writeable(sk, 1)) {
if (__sk_stream_is_writeable(sk, 1))
__sk_stream_is_writeable(sk, wake);