Manual Pages  — form_hook

form_hook - set hooks for automatic invocation by applications

SYNOPSIS DESCRIPTION set_field_init field_init set_field_term field_term set_form_init form_init set_form_term form_term RETURN VALUE PORTABILITY AUTHORS SEE ALSO

#include <form.h>

int set_field_init(FORM *form, Form_Hook func);
Form_Hook field_init(const FORM *form);

int set_field_term(FORM *form, Form_Hook func);
Form_Hook field_term(const FORM *form);

int set_form_init(FORM *form, Form_Hook func);
Form_Hook form_init(const FORM *form);

int set_form_term(FORM *form, Form_Hook func);
Form_Hook form_term(const FORM *form);

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

sets a hook to be called at form-post time and each time the selected field changes (after the change).

returns the current field init hook, if any (NULL if there is no such hook).

sets a hook to be called at form-unpost time and each time the selected field changes (before the change).

returns the current field term hook, if any (NULL if there is no such hook).

sets a hook to be called at form-post time and just after a page change once it is posted.

returns the current form init hook, if any (NULL if there is no such hook).

sets a hook to be called at form-unpost time and just before a page change once it is posted.

returns the current form term hook, if any (NULL if there is no such hook).

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)).

These routines emulate the System V forms library. They were not supported on Version 7 or BSD versions.

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

 curses(3X),  form(3X)