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From: chas@ihuxe.UUCP (Charles Lambert)
Newsgroups: net.unix,net.sources.bugs
Subject: CBREAK translation (HACKers, note)
Message-ID: <1078@ihuxe.UUCP>
Date: Wed, 20-Mar-85 19:36:52 EST
Article-I.D.: ihuxe.1078
Posted: Wed Mar 20 19:36:52 1985
Date-Received: Fri, 22-Mar-85 01:31:05 EST
Distribution: net
Organization: AT&T Bell Laboratories
Lines: 22
Xref: watmath net.unix:3988 net.sources.bugs:265

I noticed some discussion of the "Berkleyism" CBREAK, recently. I ran
into this beastie whilst trying to port the infamous HACK sources onto
System 5. Fortunately, with a copy of 4.2 BSD Programmers Manual to hand,
I gleaned the following information:

	If the CBREAK flag is set, the terminal input behaves in "half-
	cooked" (as opposed to raw) mode. I understand this to mean that
	each character is normally returned as soon as it is typed (non-
	canonical, no line editing) BUT the BREAK and INTERRUPT signals
	are still processed.

In the new arrangement of terminal controls, the matters of canonical input
and signal interception are controlled by separate flags. Thus, the 
equivalent of CBREAK seems to be:

	(ISIG | ~ICANON)

Haven't verified this yet, just a (hopefully helpful) suggestion.

Charlie Lambert
AT&T Bell Labs
Naperville, IL.