Path: utzoo!mnetor!uunet!husc6!cmcl2!nrl-cmf!ames!necntc!necis!weinberg
From: weinberg@necis.UUCP (Glenn Weinberg)
Newsgroups: comp.emacs
Subject: GNU Emacs mucking with stty settings
Message-ID: <586@necis.UUCP>
Date: 14 Jan 88 18:27:30 GMT
Reply-To: weinberg@necis.nec.com (Glenn Weinberg)
Organization: NEC Information Systems, Acton, MA
Lines: 35
Keywords: emacs stty parity


We've recently run into a problem with GNU Emacs (18.48, SysV/68 derivative
system) mucking with stty settings.  In particular, the following code can
be found in sysdep.c:

	#ifdef HAVE_TERMIO
		.
		.
		.
	#ifdef CS8
	      sg.c_cflag |= CS8;	/* allow 8th bit on input */
	      sg.c_cflag &= ~PARENB;	/* Don't check parity */
	#endif

This causes us problems on terminals that are actually set to use 7-bit
characters with even parity, as many of our terminals are.

I've commented this code out in our version, and it seems to be
behaving properly.

Now, I understand that Emacs wants to be able to handle 8-bit characters,
but if the terminal is configured for 7-bit characters, Emacs isn't
going to see any 8-bit characters.  So, my questions are:

	1) Is anything going to break if Emacs doesn't see a character
	   size of 8 with no parity?

	2) If not, does anybody know why this code is here?

Any insights would be greatly appreciated.  Thank you.
-- 
Glenn Weinberg (weinberg@necis.nec.com)
NEC Information Systems, 289 Great Road, Acton, MA 01720  (617) 263-3833 x222
After 01 Feb 88: 1300 Massachusetts Ave., Boxborough, MA 01719 (617) 635-6278
After 16 Jul 88: 1300 Massachusetts Ave., Boxborough, MA 01719 (508) 635-6278