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Message-Id: <1193418991.7673.5.camel@moonpix.desrt.ca> Date: Fri, 26 Oct 2007 13:16:31 -0400 From: Ryan Lortie <desrt@...rt.ca> To: "Zephaniah E. Hull" <warp@...allh.com> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>, linux-kernel@...r.kernel.org, Vojtech Pavlik <vojtech@...e.cz>, linux-input <linux-input@...ey.karlin.mff.cuni.cz> Subject: Re: [PATCH] Input: Support for a less exclusive grab. On Fri, 2007-26-10 at 12:44 -0400, Zephaniah E. Hull wrote: > A 'filter' cares about a key or two, and might even want to remove it > from the stream, rfkill is a good example. The patch introduces two different features that work nicely together but, by no means have to be used together. 1) set interested events By default, -all- events are delivered to an event device. you only get selective delivery when you explicitly use the 'set bits' call. 2) filter Filter all events that have been delivered to the user from further propagation. Notice that if you do not use feature #1 then you get all keystrokes delivered to you (unless someone with a higher priority than you did some filtering). If you then use feature #2 then you filter everything (since everything is delivered to you). I really do think that this is good for your use case. Your use of it would basically involve opening the event device and saying "ioctl(turn_filter_on);". The default case is that all keys are delivered (and therefore blocked from anyone below you). Cheers - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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