char *menustr[] = {
        "foo",
        "bar",
        "quux",
        "exit",
        nil
};
Menu menu = { menustr };

Menuitem menu2i[] = {
        { 20, "aaa" },
        { 21, "bbb" },
        { 22, "ccc" },
        { 23, "ddd" },
        { 0, nil }
};
Submenu menu2 = { menu2i };

Menuitem menu1i[] = {
        { 10, "foo" },
        { 11, "bar" },
        { 12, "quux", &menu2 },
        { 13, "exit" },
        { 0, nil }
};
Submenu menu1 = { menu1i };


...


                                int sel = submenuhit(3, mctl, &menu1);
                                print("menu: %d\n", sel);
                                if(sel == 13)
                                        threadexitsall(nil);