sk_msg_is_readable
bool sk_msg_is_readable(struct sock *sk);
EXPORT_SYMBOL_GPL(sk_msg_is_readable);
prot[TCP_BPF_BASE].sock_is_readable = sk_msg_is_readable;
prot->sock_is_readable = sk_msg_is_readable;
prot->sock_is_readable = sk_msg_is_readable;
prot->sock_is_readable = sk_msg_is_readable;
prot->sock_is_readable = sk_msg_is_readable;