solisten_dequeue
error = solisten_dequeue(lso, &so, 0);
error = solisten_dequeue(listen_so, &new_so,
error = solisten_dequeue(head, &so, 0);
error = solisten_dequeue(head, &so, flags);
error = solisten_dequeue(s0->l2so, &l2so, 0);
error = solisten_dequeue(head, &so, SOCK_NONBLOCK);
error = solisten_dequeue(head, &so, nbio ? SOCK_NONBLOCK : 0);
int solisten_dequeue(struct socket *, struct socket **, int);