The function post_menu displays a menu to its associated subwindow.
To trigger physical display of the subwindow, use refresh(3X) or some
equivalent curses routine (the implicit doupdate triggered by an
curses input request will do). post_menu resets the selection status
of all items.
The function unpost_menu erases menu from its associated subwindow.
These routines return one of the following:
E_OK The routine succeeded.
System error occurred (see errno).
Routine detected an incorrect or out-of-range argument.
The menu has already been posted.
Routine was called from an initialization or termination
Menu is too large for its window. You should consider using
set_menu_format to solve the problem.
The menu has not been posted.
No items are connected to the menu.
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