datalink_Down
datalink_Down(dl, CLOSE_NORMAL);
datalink_Down(dl, how);
datalink_Down(arg->cx, CLOSE_STAYDOWN);
datalink_Down(arg->cx, CLOSE_LCP);
extern void datalink_Down(struct datalink *, int);
datalink_Down(p->dl, CLOSE_NORMAL);
datalink_Down(p->dl, CLOSE_NORMAL);
datalink_Down(p->dl, CLOSE_NORMAL);
datalink_Down(p->dl, CLOSE_NORMAL);
datalink_Down(p->dl, CLOSE_NORMAL);
datalink_Down(p->dl, CLOSE_NORMAL);