input: add support for XIAllDevices and XIAllMasterDevices passive grabs.

These grabs are suported through two fake devices inputInfo.all_devices and
inputInfo.all_master_devices. These devices are not part of the device list
and are only initialised for their device id, nothing else.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 12 insertions, 0 deletions

diff --git a/dix/events.c b/dix/events.c
index 13ef5b871..d73487afc 100644
--- a/dix/events.c
+++ b/dix/events.c
@@ -248,6 +248,18 @@ static Bool CheckPassiveGrabsOnWindow(WindowPtr pWin,
  *
  *     inputInfo.numDevices
  *     Total number of devices.
+ *
+ *     inputInfo.all_devices
+ *     Virtual device used for XIAllDevices passive grabs. This device is
+ *     not part of the inputInfo.devices list and mostly unset except for
+ *     the deviceid. It exists because passivegrabs need a valid device
+ *     reference.
+ *
+ *     inputInfo.all_master_devices
+ *     Virtual device used for XIAllMasterDevices passive grabs. This device
+ *     is not part of the inputInfo.devices list and mostly unset except for
+ *     the deviceid. It exists because passivegrabs need a valid device
+ *     reference.
  */
 InputInfo inputInfo;