[REVIEW] move tty lock/initial up in the stack

[M. Warner Losh]

In message: <61609.1087632958 at critter.freebsd.dk>
            Poul-Henning Kamp <phk at phk.freebsd.dk> writes:
: This patch moves the "lock/initial" facility known from sio(4) up
: to the generic tty layer.
: 
: It adds two new flags to stty(1): -i and -l to manipulate the initial
: and lock states and eliminates the tty[il]d# and cua[il]a# devices.

I like this idea a *LOT*.

: Subsequently I would like to move the tty/cua split up as well.

How would this look to the various drivers?

Warner