CentOS 7.0 - man page for key_defined (centos section 3X)
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key_defined - check if a keycode is defined
int key_defined(const char *definition);
This is an extension to the curses library. It permits an application to determine if a
string is currently bound to any keycode.
If the string is bound to a keycode, its value (greater than zero) is returned. If no
keycode is bound, zero is returned. If the string conflicts with longer strings which are
bound to keys, -1 is returned.
These routines are specific to ncurses. They were not supported on Version 7, BSD or Sys-
tem V implementations. It is recommended that any code depending on them be conditioned
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