xace: Add XaceHookIsSet helper function

Signed-off-by: Andrew Eikum <aeikum@codeweavers.com>
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/Xext/xace.c b/Xext/xace.c
index d77b3126a..b3c67f632 100644
--- a/Xext/xace.c
+++ b/Xext/xace.c
@@ -213,6 +213,21 @@ XaceHook(int hook, ...)
     return prv ? *prv : Success;
 }
 
+/* XaceHookIsSet
+ *
+ * Utility function to determine whether there are any callbacks listening on a
+ * particular XACE hook.
+ *
+ * Returns non-zero if there is a callback, zero otherwise.
+ */
+int
+XaceHookIsSet(int hook)
+{
+    if (hook < 0 || hook >= XACE_NUM_HOOKS)
+        return 0;
+    return XaceHooks[hook] != NULL;
+}
+
 /* XaceCensorImage
  *
  * Called after pScreen->GetImage to prevent pieces or trusted windows from