1form_hook(3X)                                                    form_hook(3X)
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NAME

6       form_hook - set hooks for automatic invocation by applications
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SYNOPSIS

9       #include <form.h>
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11       int set_field_init(FORM *form, Form_Hook func);
12       Form_Hook field_init(const FORM *form);
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14       int set_field_term(FORM *form, Form_Hook func);
15       Form_Hook field_term(const FORM *form);
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17       int set_form_init(FORM *form, Form_Hook func);
18       Form_Hook form_init(const FORM *form);
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20       int set_form_term(FORM *form, Form_Hook func);
21       Form_Hook form_term(const FORM *form);
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DESCRIPTION

24       These  functions make it possible to set hook functions to be called at
25       various points in the automatic processing  of  input  event  codes  by
26       form_driver.
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28       The  function set_field_init sets a hook to be called at form-post time
29       and  each  time  the  selected  field  changes  (after   the   change).
30       field_init  returns  the current field init hook, if any (NULL if there
31       is no such hook).
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33       The function set_field_term sets a hook to  be  called  at  form-unpost
34       time  and  each  time  the  selected field changes (before the change).
35       field_term returns the current field term hook, if any (NULL  if  there
36       is no such hook).
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38       The  function  set_form_init sets a hook to be called at form-post time
39       and just after a page change once it is posted.  form_init returns  the
40       current form init hook, if any (NULL if there is no such hook).
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42       The function set_form_term sets a hook to be called at form-unpost time
43       and just before a page change once it is posted.  form_init returns the
44       current form term hook, if any (NULL if there is no such hook).
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RETURN VALUE

47       Routines that return pointers return NULL on error.  Other routines re‐
48       turn one of the following:
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50       E_OK The routine succeeded.
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52       E_SYSTEM_ERROR
53            System error occurred (see errno(3)).
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SEE ALSO

56       curses(3X), form(3X).
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NOTES

59       The  header  file  <form.h>  automatically  includes  the  header  file
60       <curses.h>.
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PORTABILITY

63       These  routines emulate the System V forms library.  They were not sup‐
64       ported on Version 7 or BSD versions.
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AUTHORS

67       Juergen Pfeifer.  Manual pages and adaptation for new curses by Eric S.
68       Raymond.
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72                                                                 form_hook(3X)
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