Function ng_btsocket_sco_send

freebsd/netgraph/bluetooth/socket/ng_btsocket_sco.c:1660–1730

 */

int
ng_btsocket_sco_send(struct socket *so, int flags, struct mbuf *m,
		struct sockaddr *nam, struct mbuf *control, struct thread *td)
{
	ng_btsocket_sco_pcb_t	*pcb = so2sco_pcb(so);
	int			 error = 0;
                        
	if (ng_btsocket_sco_node == NULL) {
		error = ENETDOWN;
		goto drop;
	}

	/* Check socket and input */
	if (pcb == NULL || m == NULL || control != NULL) {
		error = EINVAL;
		goto drop;
	}
                 
	mtx_lock(&pcb->pcb_mtx);
                  
	/* Make sure socket is connected */
	if (pcb->state != NG_BTSOCKET_SCO_OPEN) {
		mtx_unlock(&pcb->pcb_mtx); 
		error = ENOTCONN;
		goto drop;
	}

	/* Check route */
	if (pcb->rt == NULL ||
	    pcb->rt->hook == NULL || NG_HOOK_NOT_VALID(pcb->rt->hook)) {
		mtx_unlock(&pcb->pcb_mtx);
		error = ENETDOWN;
		goto drop;
	}

	/* Check packet size */
	if (m->m_pkthdr.len > pcb->rt->pkt_size) {
		NG_BTSOCKET_SCO_ERR(
"%s: Packet too big, len=%d, pkt_size=%d\n",
			__func__, m->m_pkthdr.len, pcb->rt->pkt_size);

		mtx_unlock(&pcb->pcb_mtx);
		error = EMSGSIZE;
		goto drop;
	}

	/*
	 * First put packet on socket send queue. Then check if we have
	 * pending timeout. If we do not have timeout then we must send
	 * packet and schedule timeout. Otherwise do nothing and wait for
	 * NGM_HCI_SYNC_CON_QUEUE message.
	 */

	sbappendrecord(&pcb->so->so_snd, m);
	m = NULL;

	if (!(pcb->flags & NG_BTSOCKET_SCO_TIMO)) {
		error = ng_btsocket_sco_send2(pcb);