.\"***************************************************************************
-.\" Copyright (c) 1998-2003,2004 Free Software Foundation, Inc. *
+.\" Copyright (c) 1998-2017,2018 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 1.11 2004/06/05 19:20:03 tom Exp $
+.\" $Id: define_key.3x,v 1.16 2018/07/28 21:34:56 tom Exp $
.TH define_key 3X ""
.SH NAME
\fBdefine_key\fP \- define a keycode
.SH SYNOPSIS
\fB#include <curses.h>\fP
-
+.sp
\fBint define_key(const char *definition, int keycode);\fP
.SH DESCRIPTION
This is an extension to the curses library.
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),
\fBkey_defined\fR(3X).
.SH AUTHOR
Thomas Dickey.
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