linux-kernel - Re: [PATCH 1/1] pty: BREAK for pseudoterminals

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Date:	Mon, 23 Feb 2015 10:53:21 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Nan Li <nli@...e.com>
Cc:	gregkh@...uxfoundation.org, jslaby@...e.cz,
	linux-kernel@...r.kernel.org, ptesarik@...e.cz
Subject: Re: [PATCH 1/1] pty: BREAK for pseudoterminals

On Fri,  6 Feb 2015 03:11:29 +0800
Nan Li <nli@...e.com> wrote:

> This will greatly enhance the usefulness of QEMU virtual serial ports, because the Linux kernel interprets a break on the serial console as a SysRq, but there is currently no way to pass this signal over a pseudo-terminal. This patch will work for transmitting BREAK from master to slave through pseudo-terminal.

Break is a signalling event not a 0 character. pty doesn't support modem
or other serial signalling events. Whether some kind of virtio tty<->host
interface should exist and do that I don't know, but pty does not.

Alan
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