static int pn_socket_accept(struct socket *sock, struct socket *newsock,
int flags)
{
struct sock *sk = sock->sk;
struct sock *newsk;
int err;
newsk = sk->sk_prot->accept(sk, flags, &err);
if (!newsk)
return err;
lock_sock(newsk);
sock_graft(newsk, newsock);
newsock->state = SS_CONNECTED;
release_sock(newsk);
return 0;
}
static int vsock_accept(struct socket *sock, struct socket *newsock, int flags,
bool kern)
{
struct sock *listener;
int err;
struct sock *connected;
struct vsock_sock *vconnected;
long timeout;
DEFINE_WAIT(wait);
err = 0;
listener = sock->sk;
lock_sock(listener);
if (sock->type != SOCK_STREAM) {
err = -EOPNOTSUPP;
goto out;
}
if (listener->sk_state != TCP_LISTEN) {
err = -EINVAL;
goto out;
}
/* Wait for children sockets to appear; these are the new sockets
* created upon connection establishment.
*/
timeout = sock_sndtimeo(listener, flags & O_NONBLOCK);
prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
while ((connected = vsock_dequeue_accept(listener)) == NULL &&
listener->sk_err == 0) {
release_sock(listener);
timeout = schedule_timeout(timeout);
finish_wait(sk_sleep(listener), &wait);
lock_sock(listener);
if (signal_pending(current)) {
err = sock_intr_errno(timeout);
goto out;
} else if (timeout == 0) {
err = -EAGAIN;
goto out;
}
prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
}
finish_wait(sk_sleep(listener), &wait);
if (listener->sk_err)
err = -listener->sk_err;
if (connected) {
listener->sk_ack_backlog--;
lock_sock_nested(connected, SINGLE_DEPTH_NESTING);
vconnected = vsock_sk(connected);
/* If the listener socket has received an error, then we should
* reject this socket and return. Note that we simply mark the
* socket rejected, drop our reference, and let the cleanup
* function handle the cleanup; the fact that we found it in
* the listener's accept queue guarantees that the cleanup
* function hasn't run yet.
*/
if (err) {
vconnected->rejected = true;
} else {
newsock->state = SS_CONNECTED;
sock_graft(connected, newsock);
}
release_sock(connected);
sock_put(connected);
}
out:
release_sock(listener);
return err;
}
static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
{
sock_graft(sk, sock);
sk->sk_type = sock->type;
sock->ops = &llc_ui_ops;
}