Joseph Hwang authored Jan 23, 2015 and Peter Hutterer committed Jan 30, 2015

If the --grab flag is given in capture mode, evtest keeps an EVIOCGRAB
on the device. While this grab is active, other processes will not
receive events from the kernel devices. The grab is released again
when evtest quits.

TEST=Check that the cursor is frozen when --grab option is specified.
$ evtest --grab

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