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

[H. Peter Anvin]

On 09/27/2012 07:48 AM, Cyrill Gorcunov wrote:
> On Thu, Sep 27, 2012 at 07:43:44AM -0700, H. Peter Anvin wrote:
> > > > If you can't guarantee that ALL those processes are stopped and
> > > > checkpointed/restarted, you have a huge problem.
> > >
> > > 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?
> >
> > Sorry, no.  I suspect you might be trying to do something that is
> > impossible to do in a general fashion without application changes.
>
> I see. What if I wrap all this entries with CONFIG_CHECKPOINT_RESTORE
> and say add some sysctl which would enable/disbale this ioctls. Then
> it'll be up to user-space callers to make sure that data received is
> valid and can be used? The problem is that I need to fetch this bits
> somehow with minimal changes in kernel.

I don't see how that solves anything.

	-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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