From: utzoo!decvax!cca!txr.usc-cse@Usc-Ecl@sri-unix
Newsgroups: net.unix-wizards
Title: Re: Disabling Break
Article-I.D.: sri-unix.4393
Posted: Thu Nov 25 05:41:27 1982
Received: Fri Nov 26 02:21:24 1982

Date:         23 Nov 1982 10:28-PST
Funny you should mention it, we see this problem all the time, noise on
the lines.  The "breaks" are really framing errors, translated into
interrupts (or nulls in raw mode) by a "friendly" exec.  And if you
just pull the translation, Surprise!  getty stops working, since it
depends on the nulls for speed switching.

To make a long story short, I have a fix, a change to dh.c (and
analagously dz.c), plus some ancillary changes in tty.c and getty.c (to
enable or disable the "feature" of turning the breaks into interrupts).
I plan on packaging the fix and shipping it to Berkeley, hoping that
they will integrate it into 4.2, since it really should have more done
to make it right (changes to stty, tty(4), etc.).  [Shortly after I
installed the code here, a guest from another system asked me for the
code, so I suspect that the problem is fairly widespread -- I think the
change would be appreciated by all, especially since it can be turned
on and off.]

Tim