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From: bde@kralizec.zeta.org.au (Bruce Evans)
Newsgroups: comp.os.386bsd.questions,comp.os.386bsd.bugs,misc.test
Subject: Re: Situation update on 1.1.5R [Was Re: FreeBSD 1.15R (Re: Suggestion for addition to FAQs)]
Date: 3 Jul 1994 14:39:42 +1000
Organization: Kralizec Dialup Unix Sydney - +61-2-837-1183, v.32bis v.42bis
Lines: 36
Message-ID: <2v5fee$7st@kralizec.zeta.org.au>
References: <16FE595EDS85.98022249@wsuvm1.csc.wsu.edu> <CsC2x4.tqn@mozo.cc.purdue.edu> <JKH.94Jul3010108@whisker.hubbard.ie> <CsCB9q.nt6@mozo.cc.purdue.edu>
NNTP-Posting-Host: kralizec.zeta.org.au
In article <CsCB9q.nt6@mozo.cc.purdue.edu>,
Ben Jackson <bj@staff.cc.purdue.edu> wrote:
>In article <JKH.94Jul3010108@whisker.hubbard.ie>,
>Jordan Hubbard <jkh@whisker.hubbard.ie> wrote:
>And finally, the `stty -f /dev/ttyXX clocal' workaround that you're
>supposed to use if you have trouble with cu/kermit/etc hanging on tty
>open doesn't work anymore. Under 1.1.5, the open still hangs.
You're supposed to fix cu/kermit/etc, not use kludgy workarounds :-).
Anyway, the correct (kludgy) workaround is to use the callout ports
(/dev/cua0X) for callout programs. This wasn't the correct workaround
in 1.1R only because bidirectional ports had more bugs.
Note that /dev/MAKEDEV doesn't support bidirectional ports properly.
"sh MAKEDEV all" creates "hardwired" devices tty0[0-1] for the first
two ports and callin/callout pairs ttyd[2-3] and cua0[2-3] for the
second two ports. This is confusing and almost useless since tty00 is
now indistinguishable from ttyd0 and access to cua00 can be controlled
using chown or chmod better than by not creating it. I think the tty0X
names should go away and the cua0X names should be changed to something
like ttycX or cuadX or cuacX.
Incorrect (kludgier) workarounds include the clocal hack on the initial-
state ports:
(1) stty </dev/ttyi0X clocal
(2) stty </dev/ttyidX clocal
(3) stty </dev/cuai00 clocal
There are also lock-state ports to allow stopping ordinary users and
broken programs from undoing the workarounds. See the sio manpage
and the /etc/rc.serial setup program.
--
Bruce Evans bde@kralizec.zeta.org.au