'\" t.\"***************************************************************************.\" Copyright (c) 1998 Free Software Foundation, Inc.                        *.\"                                                                          *.\" Permission is hereby granted, free of charge, to any person obtaining a  *.\" copy of this software and associated documentation files (the            *.\" "Software"), to deal in the Software without restriction, including      *.\" without limitation the rights to use, copy, modify, merge, publish,      *.\" distribute, distribute with modifications, sublicense, and/or sell       *.\" copies of the Software, and to permit persons to whom the Software is    *.\" furnished to do so, subject to the following conditions:                 *.\"                                                                          *.\" The above copyright notice and this permission notice shall be included  *.\" in all copies or substantial portions of the Software.                   *.\"                                                                          *.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *.\"                                                                          *.\" Except as contained in this notice, the name(s) of the above copyright   *.\" holders shall not be used in advertising or otherwise to promote the     *.\" sale, use or other dealings in this Software without prior written       *.\" authorization.                                                           *.\"***************************************************************************.\".\" $Id: form_hook.3x,v 1.6 1999/03/20 22:37:15 Todd.Miller Exp $.TH form_hook 3X "".SH NAME\fBform_hook\fR - set hooks for automatic invocation by applications.SH SYNOPSIS\fB#include <form.h>\fR.brint set_field_init(FORM *form, void (*func)(FORM *));.brvoid (*)(FORM *) field_init(const FORM *form);.brint set_field_term(FORM *form, void (*func)(FORM *));.brvoid (*)(FORM *) field_term(const FORM *form);.brint set_form_init(FORM *form, void (*func)(FORM *));.brvoid (*)(FORM *) form_init(const FORM *form);.brint set_form_term(FORM *form, void (*func)(FORM *));.brvoid (*)(FORM *) form_term(const FORM *form);.br.SH DESCRIPTIONThese functions make it possible to set hook functions to be called at variouspoints in the automatic processing of input event codes by \fBform_driver\fR.The function \fBset_field_init\fR sets a hook to be called at form-post timeand each time the selected field changes (after the change).  \fBfield_init\fRreturns the current field init hook, if any (\fBNULL\fR if there is no suchhook).The function \fBset_field_term\fR sets a hook to be called at form-unpost timeand each time the selected field changes (before the change).  \fBfield_term\fRreturns the current field term hook, if any (\fBNULL\fR if there is no suchhook).The function \fBset_form_init\fR sets a hook to be called at form-post time andjust after a page change once it is posted.  \fBform_init\fR returns thecurrent form init hook, if any (\fBNULL\fR if there is no such hook).The function \fBset_form_term\fR sets a hook to be called at form-unpost timeand just before a page change once it is posted.  \fBform_init\fRreturns the current form term hook, if any (\fBNULL\fR if there is no suchhook)..SH RETURN VALUERoutines that return pointers return \fBNULL\fR on error.  Other routinesreturn one of the following:.TP 5\fBE_OK\fRThe routine succeeded..TP 5\fBE_SYSTEM_ERROR\fRSystem error occurred (see \fBerrno\fR)..SH SEE ALSO\fBcurses\fR(3X), \fBform\fR(3X)..SH NOTESThe header file \fB<form.h>\fR automatically includes the header file\fB<curses.h>\fR..SH PORTABILITYThese routines emulate the System V forms library.  They were not supported onVersion 7 or BSD versions..SH AUTHORSJuergen Pfeifer.  Manual pages and adaptation for new curses by EricS. Raymond..\"#.\"# The following sets edit modes for GNU EMACS.\"# Local Variables:.\"# mode:nroff.\"# fill-column:79.\"# End: