Warning: evdev changes - no auto-grabs anymore

Daniel Stone daniel at fooishbar.org
Fri Aug 15 07:31:19 PDT 2008

On Fri, Aug 15, 2008 at 10:10:10AM -0400, Dmitry Torokhov wrote:
> On Fri, Aug 15, 2008 at 11:26:29AM +0300, Ville Syrj?l? wrote:
> > On Fri, Aug 15, 2008 at 11:02:48AM +0300, Daniel Stone wrote:
> > > On Fri, Aug 15, 2008 at 09:51:59AM +0300, Ville Syrj?l? wrote:
> > > > I was pondering about the same issue wrt. DirectFB. I wonder if
> > > > KDSETMODE/KD_GRAPHICS could be extended to take care of this or
> > > > would it break some existing applications.
> > > 
> > > Yeah, I was thinking about that, but that would mean we have issues
> > > under older kernels. I think the best was what I was proposing, which
> > 
> > Yeah that would be better since support for it could be detected runtime
> > so the driver could do the right thing when running with a recent kernel,
> > and it could just fall back to the normal grab with old kernels.
> If evdev support in X is maturing why does it even need using tty and
> mousedev multiplexors? If you just use evdev for all of your devices
> you would not have the problem of duplicate events coming from 2
> interfaces.

We don't, and killing them is fine.  Even so, try doing that, and
realise that the TTY layer has helpfully spewed out every single thing
you've typed, oh, and Ctrl-C kills the X server.

So it would seem that an ioctl to say 'I'm dealing with this, don't let
the TTY layer and mousedev get at it' would be helpful, but one that
stops short of a full grab.

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