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
These routines return one of the following:
E_OK The routine succeeded.
System error occurred (see errno(3)).
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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