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form_hook - set hooks for automatic invocation by applications |
#include <form.h> |
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). |
Routines 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). |
curses(3X), form(3X). |
The header file <form.h> automatically includes the header file <curses.h>. |
These routines emulate the System V forms library. They were not supported on Version 7 or BSD versions. |
Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S. Raymond. |