Don't poll if we are shutting down

plugins/linux/src/java/net/java/games/input/JInputLibrary.java

@@ -142,6 +142,22 @@ public class JInputLibrary {
         }
     }
     
+    /** Call to poll the device at the native library
+     * @param deviceID The native device ID
+     * @param buttonData Array to populate with button values
+     * @param relAxesData Array to populate with relative axes values
+     * @param absAxesData Array to populate with absolute axes values
+     * @return the number of events read
+     */    
+    public static int safePoll(int deviceID, int buttonData[], int relAxesData[], int absAxesData[]) {
+        if(!shutdown) {
+            return poll(deviceID, buttonData, relAxesData, absAxesData);
+        }
+        
+        return 0;
+    }
+
+    
     /** Get the name of a device from the native library
      * @param deviceID The device id
      * @return The devices name

plugins/linux/src/java/net/java/games/input/LinuxDevice.java

@@ -493,7 +493,7 @@ public class LinuxDevice extends AbstractController {
      * @return false if the controller is no longer valid.
      */
     public boolean poll() {
-        int retval = JInputLibrary.poll(nativeID, buttonData, relAxesData, absAxesData);
+        int retval = JInputLibrary.safePoll(nativeID, buttonData, relAxesData, absAxesData);
         if(retval>=0) return true;
         return false;
     }

plugins/linux/src/java/net/java/games/input/LinuxKeyboard.java

@@ -115,7 +115,7 @@ public class LinuxKeyboard extends StandardKeyboard {
      * @return False if this device is invalid.
      */
     public boolean poll() {
-        int retval = JInputLibrary.poll(nativeID, keyData, dummyRelAxesData, dummyAbsAxesData);
+        int retval = JInputLibrary.safePoll(nativeID, keyData, dummyRelAxesData, dummyAbsAxesData);
         if(retval>=0) return true;
         return false;
     }