wayland-server: Add method to get global name

This is useful for protocol designs where globals need to be referenced
in some manner.

Signed-off-by: Andri Yngvason <andri@yngvason.is>

src/wayland-server-core.h

@@ -279,6 +279,10 @@ wl_display_set_global_filter(struct wl_display *display,
 const struct wl_interface *
 wl_global_get_interface(const struct wl_global *global);
 
+uint32_t
+wl_global_get_name(const struct wl_global *global,
+                   const struct wl_client *client);
+
 uint32_t
 wl_global_get_version(const struct wl_global *global);
 

src/wayland-server.c

@@ -1369,6 +1369,23 @@ wl_global_get_interface(const struct wl_global *global)
 	return global->interface;
 }
 
+/** Get the name of the global.
+ *
+ * \param global The global object.
+ * \param client Client for which to look up the global.
+ * \return The name of the global, or 0 if the global is not visible to the
+ *         client.
+ *
+ * \memberof wl_global
+ * \since 1.22
+ */
+WL_EXPORT uint32_t
+wl_global_get_name(const struct wl_global *global,
+		   const struct wl_client *client)
+{
+	return wl_global_is_visible(client, global) ? global->name : 0;
+}
+
 /** Get the version of the given global.
  *
  * \param global The global object.