linux-kernel - Re: VT-less kernels, and /dev/console on x86

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Message-ID: <93b4c53a-9f15-4c35-965b-ac889b3061c8@sysprog.at>
Date: Wed, 9 Oct 2024 11:24:49 +0200
From: Bernd Petrovitsch <bernd@...prog.at>
To: nerdopolis <bluescreen_avenger@...izon.net>
Cc: pmladek@...e.com, rostedt@...dmis.org, linux-kernel@...r.kernel.org,
        john.ogness@...utronix.de, gregkh@...uxfoundation.org,
        tglx@...utronix.de, tony@...mide.com, senozhatsky@...omium.org
Subject: Re: VT-less kernels, and /dev/console on x86

Hi all!

On 18.08.24 02:09, nerdopolis wrote:
[...]
> I originally brought this up on linux-serial, but I think it makes more sense
> that it's part of how printk console device selection works. Without VTs, while
> most software is able to handle the situation, some userspace programs expect
> /dev/console to still be responsive. Namely systemd. It calls isatty() against
> /dev/console, and since /dev/console on VT-less systems currently defaults to
> /dev/ttyS0, and when /dev/ttyS0 is disconnected, the ioctl's fail, and it
> refuses to write log messages to it.

What's wrong with fixing systemd?

Kind regards,
	Bernd
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