This patch clears the way for removing a number of fields in struct

        d_stop          moved to struct tty.
        d_reset         unused.
        d_devtotty      linkage now provided by dev_t->si_tty.

Once this patch is in, these fields will be removed from struct
cdevsw together with d_params and d_maxio.

The changes in this patch consist of:

        initialize dev->si_tty in *_open()

        initialize tty->t_stop

        remove devtotty functions

        rename ttpoll to ttypoll

        a few adjustments to these changes in the generic code

        a bump of __FreeBSD_version


Poul-Henning Kamp             FreeBSD coreteam member
[EMAIL PROTECTED]               "Real hackers run -current on their laptop."
FreeBSD -- It will take a long time before progress goes too far!

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