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+.\" $NetBSD: nullop.9,v 1.1 2010/07/25 21:05:13 jruoho Exp $
+.\"
+.\" Copyright (c) 2010 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jukka Ruohonen.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd July 25, 2010
+.Dt NULLOP 9
+.Os
+.Sh NAME
+.Nm nullop
+.Nd dummy functions
+.Sh SYNOPSIS
+.In sys/systm.h
+.Ft int
+.Fn nullop "void *v"
+.Ft void
+.Fn voidop "void"
+.Ft int
+.Fn enodev "void"
+.Ft int
+.Fn enxio "void"
+.Ft int
+.Fn enoioctl "void"
+.Ft int
+.Fn enosys "void"
+.Ft int
+.Fn eopnotsupp "void"
+.Sh DESCRIPTION
+The
+.Fn nullop
+function provides a generic
+.Dq null operation .
+It always returns the value 0.
+The
+.Fn voidop
+function takes no arguments and does nothing.
+.Pp
+The
+.Fn enodev ,
+.Fn enxio ,
+.Fn enoioctl ,
+.Fn enosys ,
+and
+.Fn eopnotsupp
+functions always fail, returning
+.Er ENODEV ,
+.Er ENXIO ,
+.Er ENOTTY ,
+.Er ENOSYS ,
+and
+.Er EOPNOTSUPP ,
+respectively.
+.Sh EXAMPLES
+The following example demonstrates a case where
+.Fn nullop
+may be useful:
+.Bd -literal -offset indent
+uint64_t xc;
+
+\&...
+
+xc = xc_broadcast(0, (xcfunc_t)nullop, NULL, NULL);
+xc_wait(xc);
+.Ed