[Vala] Exit out of a Vala OpenGL program by using the ESC key

[Thomas F Steinhauer <tom_steinhauer hotmail com>]

Ok,

This is a tough one to figure out.  This code does not work:

void keyboard(uchar key, int x, int y) {
    switch (key) {
        case 27:
            exit(0); break;
        default : break;
    }
}

I understand that the exit(0) call does not work in vala, so what do I 
replace it with so that the program can be ended without having to click 
the X on the window?

Thanks
Tom