GTK Signals (Cont.)

The callback itself looks like this:

 /*
  * callback event function for the gtk delete event. invoked
  * when the application is closed using the window manager.
  */
 int
 delete_event(GtkWidget *widget, GdkEvent *event, gpointer data)
 {
     /* If you return FALSE in the "delete_event" signal handler,
      * GTK will emit the "destroy" signal. Returning TRUE means
      * you don't want the window to be destroyed.
      * This is useful for popping up 'are you sure you want to
      * quit?' type dialogs.
      */
 
     return(FALSE);
 }