To: Bruce Evans <bde@zeta.org.au>, Terry Lambert <terry@lambert.org>
Cc: eugen@rd.zgik.zaporizhzhe.ua, hackers@freebsd.org,
        yura@rd.zgik.zaporizhzhe.ua
References: <199512131818.LAA03398@phaeton.artisoft.com>
    <Wb06ppmuW2@ache.dialup.ru>
In-Reply-To: <Wb06ppmuW2@ache.dialup.ru>;
    from =?KOI8-R?Q?=E1=CE=C4=D2=C5=CA_=FE=C5=D2=CE=CF=D7?=
    at Wed, 13 Dec 1995 23:03:12 +0300 (MSK)
Message-Id: <bbheqpmuq3@ache.dialup.ru>
Organization: Olahm Ha-Yetzirah
Date: Thu, 14 Dec 1995 00:48:27 +0300 (MSK)
From: =?KOI8-R?Q?=E1=CE=C4=D2=C5=CA_=FE=C5=D2=CE=CF=D7?=
    (aka Andrey A. Chernov, Black Mage) <ache@astral.msk.su>
Subject: Re: bug or feature in kern/tty.c
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In message <Wb06ppmuW2@ache.dialup.ru>
    =?KOI8-R?Q?=E1=CE=C4=D2=C5=CA_=FE=C5=D2=CE=CF=D7?= writes:

>In message <199512131818.LAA03398@phaeton.artisoft.com> Terry Lambert
>    writes:

>>> >I found strange thing in 2.1.0-RELEASE (and -current) in kern/tty.c.
>>> >When carrier was lossed then ttymodem() set TS_ZOMBIE and clear
>>> >TS_CONNECTED in tp->t_state. But TS_ZOMBIE is cleared only in ttioctl()
>>> >TIOCSETA* when line is setted to ignore modem status and when line is closed.
>>> 
>>> POSIX says that (what I call the) zombie state remains until the line is
>>> closed.  Clearing it when CLOCAL is raised is a special hack that helped
>>> very old (1.1.5) versions of slattach and perhaps other broken programs
>>> work right.

>>FYI: Of the 120 or so UNIX systems I ported TERM to while I was
>>at Century Software, only SCO Xenix 2.3.0 behaved this way, and they
>>fixed it in 2.3.1 after we reported the bug.

>BTW, it seems we talk about different things. As I understand the original
>problem, the question is: WHY SLATTACH NOT RECONNECTS WHEN CARRIER
>ESTABLISHED AGAIN (AUTOMATICALLY BY MODEM)?

>I.e.
>1) driver needs to track carrier when in TS_ZOMBI and
>set TS_CONNECTED, clear TS_ZOMBI when carrier
>appearse on the line.
>2) Slattach not need exit on SIGHUP but wait reasonable time
>until carrier will be up again.

I mean of course that CLOCAL turned on, i.e. slattach only
controls line and establish carrier on them, not other
program. So partial question is: is it possible to fix sio to send
SIGHUP to controlling terminal even when CLOCAL is set?

-- 
Andrey A. Chernov        : And I rest so composedly,  /Now, in my bed,
ache@astral.msk.su       : That any beholder  /Might fancy me dead -
http://dt.demos.su/~ache : Might start at beholding me,  /Thinking me dead.
RELCOM Team,FreeBSD Team :         E.A.Poe         From "For Annie" 1849