struct cdevsw in ULTRIX-32 (RISC)

[Mark Tamura]

question: why does the ULTRIX-32 (VAX) V3.1 cdevsw struct have eleven entries
per device while the generic Berkeley 4.3 have only ten?  and when did this
extra entry appear and what is its purpose?

compare the /usr/src/sys/vax/conf.c on a Berkeley 4.3 system with the
/usr/sys/vax/conf.c on an ULTRIX-32 (VAX) V3.1 system.  i called the digital
technical support people but they had no answer other than hinting that it
might be some future hook for V4.0.  thanks.

Mark Tamura
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