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(3)).

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 supported on Version 7 or BSD versions.

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