2003-05-16 15:24:07 +00:00
|
|
|
.\" Copyright (c) 2003 Hiten M. Pandya
|
|
|
|
|
.\"
|
|
|
|
|
.\" All rights reserved.
|
|
|
|
|
.\"
|
|
|
|
|
.\" This program is free software.
|
|
|
|
|
.\"
|
|
|
|
|
.\" 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 DEVELOPERS ``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 DEVELOPERS 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.
|
|
|
|
|
.\"
|
|
|
|
|
.\" $FreeBSD$
|
|
|
|
|
.\"
|
2008-09-05 15:24:54 +00:00
|
|
|
.Dd September 5, 2008
|
2003-05-16 15:24:07 +00:00
|
|
|
.Dt CTASSERT 9
|
2010-04-14 19:08:06 +00:00
|
|
|
.Os
|
2003-05-16 15:24:07 +00:00
|
|
|
.Sh NAME
|
|
|
|
|
.Nm CTASSERT
|
|
|
|
|
.Nd compile time assertion macro
|
|
|
|
|
.Sh SYNOPSIS
|
|
|
|
|
.In sys/param.h
|
|
|
|
|
.In sys/systm.h
|
|
|
|
|
.Fn CTASSERT expression
|
|
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
The
|
2003-05-30 21:13:32 +00:00
|
|
|
.Fn CTASSERT
|
2003-05-16 15:24:07 +00:00
|
|
|
macro evaluates
|
|
|
|
|
.Fa expression
|
|
|
|
|
at compile time and causes a compiler error if it is false.
|
|
|
|
|
.Pp
|
|
|
|
|
The
|
2003-05-30 21:13:32 +00:00
|
|
|
.Fn CTASSERT
|
2003-05-16 15:24:07 +00:00
|
|
|
macro is useful for asserting the size or alignment of important
|
|
|
|
|
data structures and variables during compilation, which would
|
|
|
|
|
otherwise cause the code to fail at run time.
|
2008-09-05 15:24:54 +00:00
|
|
|
.Sh IMPLEMENTATION NOTES
|
|
|
|
|
The
|
|
|
|
|
.Fn CTASSERT
|
|
|
|
|
macro should not be used in a header file.
|
|
|
|
|
It is implemented using a dummy typedef, with a name (based on line number)
|
|
|
|
|
that may conflict with a
|
|
|
|
|
.Fn CTASSERT
|
|
|
|
|
in a source file including that header.
|
2003-05-16 15:24:07 +00:00
|
|
|
.Sh EXAMPLES
|
|
|
|
|
Assert that the size of the
|
|
|
|
|
.Vt uuid
|
|
|
|
|
structure is 16 bytes.
|
2003-05-30 21:13:32 +00:00
|
|
|
.Pp
|
|
|
|
|
.Dl "CTASSERT(sizeof(struct uuid) == 16);"
|
2003-05-16 15:24:07 +00:00
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr KASSERT 9
|
|
|
|
|
.Sh AUTHORS
|
|
|
|
|
This manual page was written by
|
2014-06-26 21:44:30 +00:00
|
|
|
.An Hiten M. Pandya Aq Mt hmp@FreeBSD.org .
|
