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

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Message-ID: <20120927161312.1eadd5d6@pyramind.ukuu.org.uk>
Date:	Thu, 27 Sep 2012 16:13:12 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: [RFC] tty: Add get- ioctls to fetch tty status

> Well, sure inside our tool before doing checkpoint we stop all
> tasks which are part of dumpee process tree. This unfortunatly
> doesn't apply to these ioctl calls. Peter, any idea how to deal
> with that?

I suspect you can't deal with that. Which isn't to say you can't still
build something useful. The query interfaces are trivial enough and
beyond that it's simply a case of documenting that they are not intended
to be generically "safe" but provide a spot sample.

Otherwise - TICOGPKT is specific to pty devices. Please therefore put it
in the pty.c code and note that not all platforms use asm-geneic TTY
ioctls so check carefully they all build.

Alan

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