dd 88c4e380c4 Add a VT_LOCKSWITCH ioctl that disallows vty switching. Something
like this can be emulated by VT_SETMODEing to VT_PROCESS and never
releasing the vty, but this has a number of problems, most notably
that a process must stay resident for the lock to be in effect.

Reviewed by:	roam, sheldonh
2002-07-10 03:29:38 +00:00
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