On Tue, Oct 05, 2010 at 08:18:35AM +0200, Oliver Neukum wrote: > Am Dienstag, 5. Oktober 2010, 08:08:22 schrieb Dmitry Torokhov: > > > But what about the next opener? He'll get a completely spurious > > > key release event, as the next key is pressed. > > > > How does the opening of a device handle relate to a device state? > > It doesn't. > > > Userspace should expect to see releases without presses (in case they > > weren't the first client that opened the device). > > Yes, but based on sane timing. From the time stamps user space > would conclude that the key had been pressed at an unknown time > before open and released at the time the event indicates. Possibly > it would compute that the key had been held for at least hours. > I do not understand. If a client never seen the "press" event and only saw "release" event it can't make any assumptions about timing. Press could be a millisecond ago or an hour ago, it just does not know. And such scenario can easily happen if the client is second to open the device. I think the only sane behavior for clients is to ignore release events for keys that they did not see "down" event for. - Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
