form_hook - Online Linux Manual PageSection : 3X
Updated :

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NAMEform_hook − set hooks for automatic invocation by applications

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SYNOPSIS#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);

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DESCRIPTIONThese 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).

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RETURN VALUERoutines 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)).

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SEE ALSOcurses(3X), form(3X).

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NOTESThe header file <form.h> automatically includes the header file <curses.h>.

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

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AUTHORSJuergen Pfeifer. Manual pages and adaptation for new curses by Eric S. Raymond. 0

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