#include <gtk/gtk.h>
 
static gboolean on_window_delete_event (GtkWidget*, GdkEvent*, gpointer);
GtkResponseType confirm_quit_dialog();
               
int
main (int argc, char *argv[])
{
       
        GtkWidget *window;
       
        /* initialize the GTK+ library */
        gtk_init (&argc, &argv);

        /* create main window */
        window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
        gtk_window_set_title (GTK_WINDOW (window), "Quit Dialog Example");
        gtk_container_set_border_width (GTK_CONTAINER (window), 10);
        gtk_widget_set_size_request (window, 200, 100);
       
        /* connect signals */
        g_signal_connect (G_OBJECT(window), "destroy",
                        G_CALLBACK (gtk_main_quit), NULL);
        g_signal_connect (G_OBJECT(window), "delete-event",
                        G_CALLBACK (on_window_delete_event), NULL);       
               
        /* show the main window */
        gtk_widget_show (window);

        gtk_main ();
       
        return 0;     
}

static gboolean
on_window_delete_event (GtkWidget *w, GdkEvent *e, gpointer user_data)
{
        if (confirm_quit_dialog() == GTK_RESPONSE_NO)
        {
                return TRUE;    /* do not quit */
        }
        else return FALSE;      /* quit */
}

GtkResponseType
confirm_quit_dialog()
{
        GtkWidget *dialog;
        GtkResponseType response;
       
        /* create the dialog */
        dialog = gtk_message_dialog_new (NULL,
                    GTK_DIALOG_DESTROY_WITH_PARENT,
                        GTK_MESSAGE_QUESTION,
                        GTK_BUTTONS_YES_NO,
                        "Are you sure you want to quit?");

        gtk_window_set_title(GTK_WINDOW(dialog), "Really Quit?");
       
        /* run the dialog */
        response = gtk_dialog_run (GTK_DIALOG (dialog));
        gtk_widget_destroy (dialog);   
       
        return response;
}