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+.\" 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 5, 2008
+.Os
+.Dt CTASSERT 9
+.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
+.Fn CTASSERT
+macro evaluates
+.Fa expression
+at compile time and causes a compiler error if it is false.
+.Pp
+The
+.Fn CTASSERT
+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.
+.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.
+.Sh EXAMPLES
+Assert that the size of the
+.Vt uuid
+structure is 16 bytes.
+.Pp
+.Dl "CTASSERT(sizeof(struct uuid) == 16);"
+.Sh SEE ALSO
+.Xr KASSERT 9
+.Sh AUTHORS
+This manual page was written by
+.An Hiten M. Pandya
+.Aq hmp@FreeBSD.org .