Function soisconnected

freebsd/kern/uipc_socket.c:3966–4036

}

void
soisconnected(struct socket *so)
{

	SOCK_LOCK(so);
	so->so_state &= ~(SS_ISCONNECTING|SS_ISDISCONNECTING|SS_ISCONFIRMING);
	so->so_state |= SS_ISCONNECTED;

	if (so->so_qstate == SQ_INCOMP) {
		struct socket *head = so->so_listen;
		int ret;

		KASSERT(head, ("%s: so %p on incomp of NULL", __func__, so));
		/*
		 * Promoting a socket from incomplete queue to complete, we
		 * need to go through reverse order of locking.  We first do
		 * trylock, and if that doesn't succeed, we go the hard way
		 * leaving a reference and rechecking consistency after proper
		 * locking.
		 */
		if (__predict_false(SOLISTEN_TRYLOCK(head) == 0)) {
			soref(head);
			SOCK_UNLOCK(so);
			SOLISTEN_LOCK(head);
			SOCK_LOCK(so);
			if (__predict_false(head != so->so_listen)) {
				/*
				 * The socket went off the listen queue,
				 * should be lost race to close(2) of sol.
				 * The socket is about to soabort().
				 */
				SOCK_UNLOCK(so);
				sorele(head);
				return;
			}
			/* Not the last one, as so holds a ref. */
			refcount_release(&head->so_count);
		}
again:
		if ((so->so_options & SO_ACCEPTFILTER) == 0) {
			TAILQ_REMOVE(&head->sol_incomp, so, so_list);
			head->sol_incqlen--;
			TAILQ_INSERT_TAIL(&head->sol_comp, so, so_list);
			head->sol_qlen++;
			so->so_qstate = SQ_COMP;
			SOCK_UNLOCK(so);
			solisten_wakeup(head);	/* unlocks */
		} else {
			SOCKBUF_LOCK(&so->so_rcv);
			soupcall_set(so, SO_RCV,
			    head->sol_accept_filter->accf_callback,
			    head->sol_accept_filter_arg);
			so->so_options &= ~SO_ACCEPTFILTER;
			ret = head->sol_accept_filter->accf_callback(so,
			    head->sol_accept_filter_arg, M_NOWAIT);
			if (ret == SU_ISCONNECTED) {
				soupcall_clear(so, SO_RCV);
				SOCKBUF_UNLOCK(&so->so_rcv);