72 lines
2.1 KiB
Groff
72 lines
2.1 KiB
Groff
.\" $NetBSD: SET.9,v 1.3 2014/03/12 16:37:01 jruoho Exp $
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.\"
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.\" Copyright (c) 2010 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jukka Ruohonen.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd March 12, 2014
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.Dt SET 9
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.Os
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.Sh NAME
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.Nm SET
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.Nd primitive bit macros
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.Sh SYNOPSIS
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.In sys/types.h
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.Ft void
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.Fn SET "val" "x"
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.Ft int
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.Fn ISSET "val" "x"
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.Ft void
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.Fn CLR "val" "x"
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.Sh DESCRIPTION
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These macros define three standard bit-operations:
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.Bl -enum -offset indent
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.It
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.Fn SET
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sets the bit
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.Fa x
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in
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.Fa val ;
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.It
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.Fn CLR
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clears the bit
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.Fa x
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in
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.Fa val ;
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and
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.It
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.Fn ISSET
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returns 1 if the bit
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.Fa x
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is set in
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.Fa val .
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.El
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.Sh SEE ALSO
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.Xr bits 3
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.Sh BUGS
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The rationale is to provide clarity in the source code,
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but arguably these operations are clear enough without the use of the macros.
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