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+.\" $NetBSD: SET.9,v 1.5 2015/12/13 23:32:52 wiz 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 December 13, 2015
+.Dt SET 9
+.Os
+.Sh NAME
+.Nm SET
+.Nd primitive bit macros
+.Sh SYNOPSIS
+.In sys/types.h
+.Ft void
+.Fn SET "val" "x"
+.Ft int
+.Fn ISSET "val" "x"
+.Ft void
+.Fn CLR "val" "x"
+.Sh DESCRIPTION
+These macros define three standard bit operations:
+.Bl -enum -offset indent
+.It
+.Fn SET
+sets the set bits from
+.Fa x
+in
+.Fa val ;
+.It
+.Fn CLR
+clears the set bits from
+.Fa x
+in
+.Fa val ;
+and
+.It
+.Fn ISSET
+returns true if any of the set bits from
+.Fa x
+are set in
+.Fa val .
+.El
+.Sh SEE ALSO
+.Xr bits 3
+.Sh BUGS
+The rationale is to provide clarity in the source code,
+but arguably these operations are clear enough without the use of the macros.