void gdk_window_set_functions ( GdkWindow* window, GdkWMFunction functions )
Sets hints about the window management functions to make available via buttons on the window frame.
On the X backend, this function sets the traditional Motif window manager hint for this purpose. However, few window managers do anything reliable or interesting with this hint. Many ignore it entirely.
functions argument is the logical OR of values from the
GdkWMFunction enumeration. If the bitmask includes #GDK_FUNC_ALL,
then the other bits indicate which functions to disable; if
it doesn’t include #GDK_FUNC_ALL, it indicates which functions to enable.
Bitmask of operations to allow on