Question about 4.2BSD uprintf()

[Bruce Robertson]

I was wondering about something I saw in "subr_prf.c" in the 4.2 BSD
kernel sources.  The comments for the function uprintf() advertise that
you can call it from an interrupt routine to send a message to the
current user's terminal.  However, the code that finds out the user's
current terminal references u.u_ttyp.  This means that uprintf() will
print its message on the terminal of the *currently running* process.
Which process this is is essentially random, and almost always NOT the
process that caused the interrupt to occur.  I can't think of any
situation where you would want to actually call uprintf() from an
interrupt routine.  Any comments?
-- 

	Bruce Robertson
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