Gtk+/Gnome Application Development
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In the GTK+ and Gnome source code, many functions have two variants: one called gtk_whatever_foo(), and another called gtk_whatever_real_foo().What's the difference?

gtk_whatever_foo() is typically a public function which emits the "foo" signal, taking care of any necessary details before and after emission (remember that only GTK_RUN_ACTION signals can be emitted without special actions before and after). gtk_whatever_real_foo() will be the default handler for the signal, installed in the object's class struct. the chapter called Writing a GtkWidget has many examples of this.