tcp_fuse_rcv_drain
(void) tcp_fuse_rcv_drain(tcp->tcp_connp->conn_rq, tcp,
(void) tcp_fuse_rcv_drain(peer_tcp->tcp_connp->conn_rq,
(void) tcp_fuse_rcv_drain(peer_connp->conn_rq, peer_tcp,
(void) tcp_fuse_rcv_drain(tcp->tcp_connp->conn_rq, tcp, NULL);
if (tcp_fuse_rcv_drain(q, tcp, tcp->tcp_fused ? NULL :
extern boolean_t tcp_fuse_rcv_drain(queue_t *, tcp_t *, mblk_t **);