kdrive: Grab evdev mouse/keyboard devices when X server is active

Input events are directed to both vt and input devices by default.
Unless input devices are grabbed, keyboard events fill it vt buffers
and cause spontaneous wakeups in kernel tty layer when buffers are full.

Signed-off-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/hw/kdrive/linux/evdev.c b/hw/kdrive/linux/evdev.c
index f6017ba51..096a2ddc3 100644
--- a/hw/kdrive/linux/evdev.c
+++ b/hw/kdrive/linux/evdev.c
@@ -243,7 +243,9 @@ EvdevPtrEnable (KdPointerInfo *pi)
     if (fd < 0)
         return BadMatch;
 
-        
+    if (ioctl (fd, EVIOCGRAB, 1) < 0)
+        perror ("Grabbing evdev mouse device failed");
+
     if (ioctl (fd, EVIOCGBIT(0 /*EV*/, sizeof (ev)), ev) < 0)
     {
         perror ("EVIOCGBIT 0");
@@ -335,6 +337,10 @@ EvdevPtrDisable (KdPointerInfo *pi)
         return;
 
     KdUnregisterFd (pi, ke->fd, TRUE);
+
+    if (ioctl (ke->fd, EVIOCGRAB, 0) < 0)
+        perror ("Ungrabbing evdev mouse device failed");
+
     xfree (ke);
     pi->driverPrivate = 0;
 }
@@ -425,6 +431,9 @@ EvdevKbdEnable (KdKeyboardInfo *ki)
     if (fd < 0)
         return BadMatch;
 
+    if (ioctl (fd, EVIOCGRAB, 1) < 0)
+        perror ("Grabbing evdev keyboard device failed");
+
     if (ioctl (fd, EVIOCGBIT(0 /*EV*/, sizeof (ev)), ev) < 0) {
         perror ("EVIOCGBIT 0");
         close (fd);
@@ -496,6 +505,10 @@ EvdevKbdDisable (KdKeyboardInfo *ki)
         return;
 
     KdUnregisterFd (ki, ke->fd, TRUE);
+
+    if (ioctl (ke->fd, EVIOCGRAB, 0) < 0)
+        perror ("Ungrabbing evdev keyboard device failed");
+
     xfree (ke);
     ki->driverPrivate = 0;
 }