bt_mbox_in_t
bzero(bt->in_boxes, sizeof(bt_mbox_in_t) * bt->num_boxes);
(sizeof(bt_mbox_in_t) +
bt->num_boxes * (sizeof(bt_mbox_in_t)
bt->in_boxes = (bt_mbox_in_t *)&bt->out_boxes[bt->num_boxes];
bt_mbox_in_t *cur_inbox;
bt_mbox_in_t *last_inbox;
bt_mbox_in_t *in_boxes;