linux-kernel - Re: [RFC] tty: Add get- ioctls to fetch tty status

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Message-ID: <20120927141425.GG6618@moon>
Date:	Thu, 27 Sep 2012 18:14:25 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Jiri Slaby <jslaby@...e.cz>, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC] tty: Add get- ioctls to fetch tty status

On Thu, Sep 27, 2012 at 03:14:47PM +0100, Alan Cox wrote:
> > Alan, Greg, what's opinion? This flags fetching is the same as say fetching
> > of termios settings, once fetched they can be changed immediately, and it's
> > up to caller what to do with termios settings. No?
> 
> I think you need to explain what you expect to be doing with it, and why
> it is safe in that application.

OK, it seems it was unclear from changelog. We need to know this parameters
to be able to restore tty connection after checkpoint.

While we easily can fetch termios settings and such, there are few bits which
are missed to expord. So this patch provides them to user-space.
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