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Revision 1.1, Sun Jul 25 21:05:13 2010 UTC (13 years, 8 months ago) by jruoho
Branch: MAIN
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Branch point for: uebayasi-xip 

Document the fine nullop() family of dummy functions.

.\" $NetBSD: nullop.9,v 1.1 2010/07/25 21:05:13 jruoho Exp $
.\"
.\" Copyright (c) 2010 The NetBSD Foundation, Inc.
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.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Jukka Ruohonen.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
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.\"    notice, this list of conditions and the following disclaimer.
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.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