.\"***************************************************************************
-.\" Copyright (c) 1998-2002,2003 Free Software Foundation, Inc. *
+.\" Copyright 2018,2020 Thomas E. Dickey *
+.\" Copyright 1998-2010,2017 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 *
.\"
.\" Author: Thomas E. Dickey 1997
.\"
-.\" $Id: define_key.3x,v 1.10 2003/10/25 20:33:16 tom Exp $
+.\" $Id: define_key.3x,v 1.18 2020/10/24 09:52:54 tom Exp $
.TH define_key 3X ""
.SH NAME
\fBdefine_key\fP \- define a keycode
.SH SYNOPSIS
\fB#include <curses.h>\fP
-
-\fBint define_key(const char *definition, int keycode);\fP
+.sp
+\fBint define_key(const char *\fP\fIdefinition\fP\fB, int \fP\fIkeycode\fP\fB);\fP
.SH DESCRIPTION
This is an extension to the curses library.
It permits an application to define keycodes with their corresponding control
Similarly, if the given keycode is negative or zero, any existing string
for the given definition is removed.
.SH RETURN VALUE
-The keycode must be greater than zero, else ERR is returned.
+The keycode must be greater than zero, and the string non-null,
+otherwise \fBERR\fP is returned.
+\fBERR\fP may also be returned if there is insufficient memory to allocate the
+data to store the definition.
+If no error is detected, \fBOK\fP is returned.
.SH PORTABILITY
-These routines are specific to ncurses. They were not supported on
-Version 7, BSD or System V implementations. It is recommended that
+These routines are specific to ncurses.
+They were not supported on
+Version 7, BSD or System V implementations.
+It is recommended that
any code depending on them be conditioned using NCURSES_VERSION.
.SH SEE ALSO
-\fBkeyok\fR(3X).
+\fBkeyok\fR(3X),
+\fBkey_defined\fR(3X).
.SH AUTHOR
Thomas Dickey.
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