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+.\" $NetBSD: __alignof__.3,v 1.5 2011/04/14 06:56:28 wiz Exp $
+.\"
+.\" Copyright (c) 2010 Jukka Ruohonen <jruohonen@iki.fi>
+.\" All rights reserved.
+.\"
+.\" 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 20, 2010
+.Dt __ALIGNOF__ 3
+.Os
+.Sh NAME
+.Nm __alignof__
+.Nd GNU extension for alignment of an object
+.Sh SYNOPSIS
+.Ft int
+.Fn __alignof__ "void x"
+.Sh DESCRIPTION
+The
+.Fn __alignof__
+operator returns the alignment of its operand.
+The operand can be a type or an expression.
+If the operand is a
+.Sq lvalue ,
+the return value represents the required alignment of the underlying type,
+not the actual alignment of the specified
+.Sq lvalue .
+.Pp
+The returned value is specific to the architecture and the
+.Tn ABI .
+If the architecture does not impose strict alignment requirements,
+.Fn __alignof__
+returns the minimum required alignment.
+If
+.Xr __aligned 3
+is used to increase the alignment,
+.Fn __alignof__
+returns the specified alignment.
+.Sh EXAMPLES
+The syntax is comparable to the
+.Fn sizeof
+operator.
+If the architecture aligns integers along 32-bit address boundaries,
+the following should print the value 4.
+.Bd -literal -offset indent
+(void)printf("%d\en", __alignof__(int));
+.Ed
+.Pp
+On the other hand, the following example should print the value 1,
+even though this is unlikely to be the actual alignment of the
+structure member.
+.Bd -literal -offset indent
+struct align {
+	int  x;
+	char y;
+} a;
+
+(void)printf("%d\en", __alignof__(a.y));
+.Ed
+.Sh SEE ALSO
+.Xr gcc 1 ,
+.Xr attribute 3 ,
+.Xr offsetof 3 ,
+.Xr typeof 3
+.Sh CAVEATS
+This is a non-standard, compiler-specific extension.