+LttvFilter *lttvwindow_get_filter(Tab *tab);
+
+/**
+ * Function to set the filter of the current tab.
+ * It should be called by the filter GUI to tell the
+ * main window to update the filter tab's lttv_filter.
+ *
+ * Notice : the lttv_filter object will be owned by the
+ * main window after the return of this function.
+ * Do NOT desallocate it.
+ *
+ * @param main_win, the main window the viewer belongs to.
+ * @param filter, a pointer to a filter.
+ */
+
+void lttvwindow_report_filter(Tab *tab, LttvFilter *filter);
+