formhook(3X) formhook(3X)

NAME
       ffoorrmmhhooookk - set hooks for automatic invocation by applications

SYNOPSIS
       ##iinncclluuddee <>
       int setfieldinit(FORM *form, void (*func)(FORM *));
       void (*)(FORM *) fieldinit(const FORM *form);
       int setfieldterm(FORM *form, void (*func)(FORM *));
       void (*)(FORM *) fieldterm(const FORM *form);
       int setforminit(FORM *form, void (*func)(FORM *));
       void (*)(FORM *) forminit(const FORM *form);
       int setformterm(FORM *form, void (*func)(FORM *));
       void (*)(FORM *) formterm(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
       ffoorrmmddrriivveerr.

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

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

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

       The function sseettffoorrmmtteerrmm sets a hook to be called at form-unpost time
       and just before a page change once it is posted.  ffoorrmmiinniitt returns the
       current form term hook, if any (NNUULLLL if there is no such hook).

RREETTUURRNN VVAALLUUEE
       Routines  that  return  pointers  return NNUULLLL on error.  Other routines
       return one of the following:

       EEOOKK The routine succeeded.

       EESSYYSSTTEEMMEERRRROORR
            System error occurred (see eerrrrnnoo).

SEE ALSO
       ccuurrsseess(3X), ffoorrmm(3X).

NNOOTTEESS
       The  header  file  <>  automatically  includes  the  header  file
       <>.

PPOORRTTAABBIILLIITTYY
       These  routines emulate the System V forms 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.



                                                                 formhook(3X)