Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!pasteur!ucbvax!decwrl!decvax!mandrill!hal!ncoast!allbery
From: allbery@ncoast.UUCP (Brandon Allbery)
Newsgroups: comp.unix.wizards
Subject: Re: Parity on 4.x BSD UNIX ports
Message-ID: <7674@ncoast.UUCP>
Date: 23 Apr 88 18:48:40 GMT
References: <12952@brl-adm.ARPA> <11057@mimsy.UUCP>
Reply-To: allbery@ncoast.UUCP (Brandon Allbery)
Followup-To: comp.unix.wizards
Organization: Cleveland Public Access UN*X, Cleveland, Oh
Lines: 34

As quoted from <11057@mimsy.UUCP> by chris@mimsy.UUCP (Chris Torek):
+---------------
| In article <12952@brl-adm.ARPA> cpw%sneezy@lanl.gov (C. Philip Wood) writes:
| >... It appears that there are only two choices [for] output, odd or
| >even parity. ... our site has chosen to require its hosts to not
| >generate parity. ... there are some vendor terminals and emulators
| 
| great force' :-) ).  Berkeley CSRG are working on a POSIX-like tty
| interface, which will no doubt fix all this, but that is not likely to
| emerge for some time.  Sun may provide something useful soon, what with
| their AT&T deal.  Some vendors (e.g., Pyramid) provide a SysV interface
+---------------

[Just in case anyone's interested...]

System V has independent parity handling on input and output, with the
exception that the same parity setting (odd or even) must be used for both
if parity is enabled.

Input modes:	inpck	check parity on input
		istrip	strip parity before passing to program
		parmrk	mark parity errors with out-of-band characters
			(or special character escapes)
		ignpar	if set, parity errors are ignored; otherwise they
			are passed on as NUL (ASCII 0)

Control modes:	parenb	enable output parity generation
		parodd	if set, odd parity is used for parenb and inpck;
			otherwise, even parity is used

(Someone answer me a dumb question:  what good is parity checking on a pty?)
-- 
	      Brandon S. Allbery, moderator of comp.sources.misc
	{well!hoptoad,uunet!marque,cbosgd,sun!mandrill}!ncoast!allbery
Delphi: ALLBERY						     MCI Mail: BALLBERY