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RedHat 9 (Linux i386) - man page for set_field_init (redhat section 3X)

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form_hook(3X)									    form_hook(3X)

NAME
       form_hook - set hooks for automatic invocation by applications

SYNOPSIS
       #include <form.h>
       int set_field_init(FORM *form, void (*func)(FORM *));
       void (*)(FORM *) field_init(const FORM *form);
       int set_field_term(FORM *form, void (*func)(FORM *));
       void (*)(FORM *) field_term(const FORM *form);
       int set_form_init(FORM *form, void (*func)(FORM *));
       void (*)(FORM *) form_init(const FORM *form);
       int set_form_term(FORM *form, void (*func)(FORM *));
       void (*)(FORM *) form_term(const FORM *form);

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 form_driver.

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

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

       The function set_form_init sets a hook to be called at form-post time  and  just  after	a
       page change once it is posted.  form_init returns the current form init hook, if any (NULL
       if there is no such hook).

       The function set_form_term sets a hook to be called at form-unpost time and just before	a
       page change once it is posted.  form_init returns the current form 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 fol-
       lowing:

       E_OK The routine succeeded.

       E_SYSTEM_ERROR
	    System error occurred (see errno).

SEE ALSO
       curses(3X), form(3X).

NOTES
       The header file <form.h> automatically includes the header file <curses.h>.

PORTABILITY
       These  routines	emulate the System V forms 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.

										    form_hook(3X)
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