From: utzoo!decvax!cca!chris.umcp-cs@UDel-Relay@sri-unix
Newsgroups: net.unix-wizards
Title: Re:  Disabling Break
Article-I.D.: sri-unix.4422
Posted: Fri Nov 26 00:00:25 1982
Received: Sat Nov 27 01:19:22 1982

From:     Chris Torek <chris.umcp-cs@UDel-Relay>
Date:     23 Nov 82 15:17:55 EST  (Tue)
I was thinking about something very similar.  It turns out
that if you really want to do it, you can translate breaks
(which look like framing errors) to any character you please,
or even always send SIGINT.  (The code I've looked at is for
Berkeley 4.1BSD.)  When a framing error occurs, the device
driver does a (*cdevsw[tp->t_dev].l_rint) (tp->t_intr)
[or whatever the names are] to insert an interrupt character
into the input stream.  If it were to call the l_rint with
a minus one, and all the rint routines understood this, you
could have many "break" protocols.  I'd like to be able to
generate SIGINT with the break key even in raw mode, and this
could do it.