# menu_hook 3x

    menu_hook(3x)                                                    menu_hook(3x)

## NAME

           menu_hook - set hooks for automatic invocation by applications

## SYNOPSIS

           #include <menu.h>
           int set_item_init(MENU *menu, Menu_Hook func);
           Menu_Hook item_init(const MENU *menu);
           int set_item_term(MENU *menu, Menu_Hook func);
           Menu_Hook item_term(const MENU *menu);
           int set_menu_init(MENU *menu, Menu_Hook func);
           Menu_Hook menu_init(const MENU *menu);
           int set_menu_term(MENU *menu, Menu_Hook func);
           Menu_Hook menu_term(const MENU *menu);

## DESCRIPTION

           These  functions make it possible to set hook functions to be called at
           various points in the automatic processing  of  input  event  codes  by
           menu_driver.

           The  function  set_item_init sets a hook to be called at menu-post time
           and each time the selected item changes (after the change).   item_init
           returns  the  current  item init hook, if any (NULL if there is no such
           hook).

           The function set_item_term sets a hook to be called at menu-unpost time
           and each time the selected item changes (before the change).  item_term
           returns the current item term hook, if any (NULL if there  is  no  such
           hook).

           The  function  set_menu_init sets a hook to be called at menu-post time
           and just after the top row on the  menu  changes  once  it  is  posted.
           menu_init  returns the current menu init hook, if any (NULL if there is
           no such hook).

           The function set_menu_term sets a hook to be called at menu-unpost time
           and  just  before  the  top  row on the menu changes once it is posted.
           menu_term returns the current menu term hook, if any (NULL if there  is
           no such hook).

## RETURN VALUE

           Routines  that  return  pointers  return NULL on error.  Other routines
           return one of the following:

           E_OK The routine succeeded.

           E_SYSTEM_ERROR
                System error occurred (see errno).

## SEE ALSO

           curses(3x), menu(3x).

## NOTES

           The  header  file  <menu.h>  automatically  includes  the  header  file
           <curses.h>.

## PORTABILITY

           These  routines  emulate the System V menu library.  They were not sup-
           ported on Version 7 or BSD versions.

## AUTHORS

           Juergen Pfeifer.  Manual pages and adaptation for new curses by Eric S.
           Raymond.

                                                                     menu_hook(3x)