Warning: evdev changes - no auto-grabs anymore

Peter Hutterer peter.hutterer at who-t.net
Thu Aug 14 17:24:58 PDT 2008

On Thu, Aug 14, 2008 at 01:50:09PM -0400, Adam Jackson wrote:
> > Sounds good, but unfortunately, this change seems to cause trouble of
> > its own, namely that hitting ctrl-C terminates the X server - not very
> > useful. :) It looks like all the input intended for the X server also
> > goes to a VT (I can briefly see fragments of what I typed before hitting
> > ctrl-C until the server restarts), and that's probably how the ctrl-C
> > results in a SIGTERM to the X server.
> This is, in fact, one of the main reasons I put SIOCGRAB there in the
> first place; you need to keep the keyboard's event stream out of the tty
> layer entirely, not just out of reach of the kbd driver.  At the time
> the argument was also that you wanted to keep them out of reach of
> normal users so you couldn't snoop passwords, but now that there's a
> ConsoleKit I think that's less true.
> Mac mouse emulation we could probably just blacklist away from the evdev
> driver.  rfkill is... harder?  Does it get its own event device or not?
> I'd think it would have to get one kill device per wireless device.

The issue is not grabbing the mouse emulation device, it's grabbing the
keyboard that generates those keys events that should result in a button click
on a different device. So we'd need something in the kernel I guess.


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