From: "Thomas Köhler" <jean-luc@picard.franken.de>
To: zsh-workers@sunsite.dk
Subject: Re: zsh on serial line?
Date: Tue, 1 May 2001 23:23:57 +0200 [thread overview]
Message-ID: <20010501232357.A2264@picard.franken.de> (raw)
In-Reply-To: <1010501170648.ZM7145@candle.brasslantern.com>; from schaefer@candle.brasslantern.com on Tue, May 01, 2001 at 05:06:47PM +0000
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On Tue, May 01, 2001 at 05:06:47PM +0000,
Bart Schaefer <schaefer@candle.brasslantern.com> wrote:
>
> On May 1, 11:48am, Thomas wrote:
> } Subject: zsh on serial line?
> }
> } I have a digital VT510 which I connected to my PC's second serial port,
> } /dev/ttyS1, and on the linux box, I started "mgetty -r /dev/ttyS1".
> }[...]
> } [snipped lots of syscalls]
> } readlink("/proc/self/fd/0", "/dev/ttyS1", 4095) = 10
> } open("/dev/ttyS1", O_RDWR|O_NOCTTY|0x8000
> }
> } Uhm. It stops when trying to open /dev/ttyS1 - what is it waiting for?
>
> It must be this code in init.c:
>
> /* Make sure the tty is opened read/write. */
> if (isatty(0)) {
> zsfree(ttystrname);
> if ((ttystrname = ztrdup(ttyname(0)))) {
> SHTTY = movefd(open(ttystrname, O_RDWR | O_NOCTTY));
>
> The kernel probably thinks that ttyS1 is a modem line and is imposing the
> "two-device / kernel-locking scheme" mentioned under the -b option in the
> mgetty manual page.
Good point.
> } How can I change that?
>
> Try using "setserial ^session_lockout ^pgrp_lockout" on the line, but I've
> never actually done that so I don't know if it will make any difference.
Well, setserial doesn't like "^pgrp_lockout", but "^session_lockout"
seems to help in that I can interrupt the zsh using ^C - but that ends
the zsh session which is not exactly what I want :)
Uhm... the trick is not even that complicated: Just use /sbin/getty
instead of /sbin/mgetty - voila, all works like a charm :-)
Now guess why it's called m(odem)getty and not vtgetty :)
Thanks,
Thomas
--
Thomas Köhler Email: jean-luc@picard.franken.de | LCARS - Linux
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next prev parent reply other threads:[~2001-05-01 21:25 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-05-01 9:48 Thomas Köhler
2001-05-01 17:06 ` Bart Schaefer
2001-05-01 21:23 ` Thomas Köhler [this message]
2001-05-01 21:28 ` Thomas Köhler
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