Date: Wed, 8 Feb 2012 08:42:17 +0000 (UTC) From: Kevin Lo <kevlo@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r231191 - head/share/man/man3 Message-ID: <201202080842.q188gHxn030563@svn.freebsd.org>
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Author: kevlo Date: Wed Feb 8 08:42:17 2012 New Revision: 231191 URL: http://svn.freebsd.org/changeset/base/231191 Log: Add offsetof.3 man page Obtained from: OpenBSD Added: head/share/man/man3/offsetof.3 (contents, props changed) Modified: head/share/man/man3/Makefile Modified: head/share/man/man3/Makefile ============================================================================== --- head/share/man/man3/Makefile Wed Feb 8 07:34:03 2012 (r231190) +++ head/share/man/man3/Makefile Wed Feb 8 08:42:17 2012 (r231191) @@ -10,6 +10,7 @@ MAN= assert.3 \ fpgetround.3 \ intro.3 \ makedev.3 \ + offsetof.3 \ ${PTHREAD_MAN} \ queue.3 \ siginfo.3 \ Added: head/share/man/man3/offsetof.3 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/share/man/man3/offsetof.3 Wed Feb 8 08:42:17 2012 (r231191) @@ -0,0 +1,47 @@ +.\" $OpenBSD: offsetof.3,v 1.2 2010/02/18 18:30:19 jmc Exp $ +.\" +.\" Copyright (c) 2010 Thomas Pfaff <tpfaff@tp76.info> +.\" +.\" Permission to use, copy, modify, and distribute this software for any +.\" purpose with or without fee is hereby granted, provided that the above +.\" copyright notice and this permission notice appear in all copies. +.\" +.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +.\" +.\" $FreeBSD$ +.\" +.Dd February 18 2010 +.Dt OFFSETOF 3 +.Os +.Sh NAME +.Nm offsetof +.Nd offset of a structure member +.Sh SYNOPSIS +.Fd #include <stddef.h> +.Ft size_t +.Fn offsetof "type" "member" +.Sh DESCRIPTION +The +.Fn offsetof +macro expands to an integer constant expression of type +.Ft size_t +and yields the offset, +in bytes, of the field +.Ar member +from the start of the structure +.Ar type . +.Pp +A compiler error will result if +.Ar member +is not aligned to a byte boundary (i.e. it is a bit-field). +.Sh STANDARDS +The +.Fn offsetof +macro conforms to +.St -ansiC .
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