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Callback sock_def_readable()

Text extracted form the original post here.

The default ->sk_data_ready() callback is sock_def_readable():

static void sock_def_readable(struct sock *sk, int len)
{                       
        struct socket_wq *wq;

        rcu_read_lock();
        wq = rcu_dereference(sk->sk_wq);
        if (wq_has_sleeper(wq))
                wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI |
                                                POLLRDNORM | POLLRDBAND);
        sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
        rcu_read_unlock();
} 54 more words
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