XKB: Add debug key actions for grabs & window tree

Add four new private XKB actions for debugging:
    * PrGrbs: print active grabs to the log file
    * Ungrab: ungrab all currently active grabs
    * ClsGrb: kill clients with active grabs
    * PrWins: dump the current window tree to the log file

To use these, you need to modify your XKB maps, e.g. the following to
have Ctrl+Alt+(F9-F12) mapped to the above:
 - compat/xfree86:
    interpret XF86LogGrabInfo {
        action = Private(type=0x86, data="PrGrbs");
    };
    interpret XF86Ungrab {
        action = Private(type=0x86, data="Ungrab");
    }
    interpret XF86ClearGrab {
        action = Private(type=0x86, data="ClsGrb");
    }
    interpret XF86LogWindowTree {
        action = Private(type=0x86, data="PrWins");
    }

 - symbols/pc:
    key <FK09> {        type="CTRL+ALT", [ Return, XF86LogGrabInfo      ]   };
    key <FK10> {        type="CTRL+ALT", [ Return, XF86Ungrab           ]   };
    key <FK11> {        type="CTRL+ALT", [ Return, XF86ClearGrab        ]   };
    key <FK12> {        type="CTRL+ALT", [ Return, XF86LogWindowTree    ]   };

At the moment, this only works if the grabbing client continues to call
AllowEvents, as the server does no event processing at all when a device
is frozen.

Signed-off-by: Daniel Stone <daniel@fooishbar.org>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 15 insertions, 0 deletions

diff --git a/hw/xfree86/dixmods/xkbPrivate.c b/hw/xfree86/dixmods/xkbPrivate.c
index 9742eaf31..06d1c2b3d 100644
--- a/hw/xfree86/dixmods/xkbPrivate.c
+++ b/hw/xfree86/dixmods/xkbPrivate.c
@@ -13,6 +13,7 @@
 #define XKBSRV_NEED_FILE_FUNCS
 #include <xkbsrv.h>
 
+#include "dixgrabs.h"
 #include "os.h"
 #include "xf86.h"
 
@@ -29,6 +30,20 @@ XkbDDXPrivate(DeviceIntPtr dev,KeyCode key,XkbAction *act)
             xf86ProcessActionEvent(ACTION_PREV_MODE, NULL);
         else if (strcasecmp(msgbuf, "+vmode")==0)
             xf86ProcessActionEvent(ACTION_NEXT_MODE, NULL);
+        else if (strcasecmp(msgbuf, "prgrbs")==0) {
+            DeviceIntPtr tmp;
+            xf86Msg(X_INFO, "Printing all currently active device grabs:\n");
+            for (tmp = inputInfo.devices; tmp; tmp = tmp->next)
+                if (tmp->deviceGrab.grab)
+                    PrintDeviceGrabInfo(tmp);
+            xf86Msg(X_INFO, "End list of active device grabs\n");
+        }
+        else if (strcasecmp(msgbuf, "ungrab")==0)
+            UngrabAllDevices(FALSE);
+        else if (strcasecmp(msgbuf, "clsgrb")==0)
+            UngrabAllDevices(TRUE);
+        else if (strcasecmp(msgbuf, "prwins")==0)
+            PrintWindowTree();
     }
 
     return 0;