1.\" $NetBSD: SET.9,v 1.5 2015/12/13 23:32:52 wiz Exp $ 2.\" 3.\" Copyright (c) 2010 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Jukka Ruohonen. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\" POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd December 13, 2015 31.Dt SET 9 32.Os 33.Sh NAME 34.Nm SET 35.Nd primitive bit macros 36.Sh SYNOPSIS 37.In sys/types.h 38.Ft void 39.Fn SET "val" "x" 40.Ft int 41.Fn ISSET "val" "x" 42.Ft void 43.Fn CLR "val" "x" 44.Sh DESCRIPTION 45These macros define three standard bit operations: 46.Bl -enum -offset indent 47.It 48.Fn SET 49sets the set bits from 50.Fa x 51in 52.Fa val ; 53.It 54.Fn CLR 55clears the set bits from 56.Fa x 57in 58.Fa val ; 59and 60.It 61.Fn ISSET 62returns true if any of the set bits from 63.Fa x 64are set in 65.Fa val . 66.El 67.Sh SEE ALSO 68.Xr bits 3 69.Sh BUGS 70The rationale is to provide clarity in the source code, 71but arguably these operations are clear enough without the use of the macros. 72