Ultrix tape job is unkillable!

[Colin Plumb]

In an OS I was doing recently, as we were doing the device interface
(calls a device should support... open, close, read, write, ioctl for
misc. stuff), I successfully argued that abort should be at this level,
to encourage people to use it, and so there is no perverse thing you
could do with ioctl that might cause it to block.  I't a special case
all the way through (since it does slightly nasty things to the transaction
in progress).
-- 
	-Colin (uunet!microsof!w-colinp)