Copyright (c) 2010 The NetBSD Foundation, Inc.
All rights reserved.
This code is derived from software contributed to The NetBSD Foundation
by Jukka Ruohonen.
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 November 10, 2019 .Dt CDEFS 3 .Os .Sh NAME .Nm cdefs .Nd common definitions and macros .Sh SYNOPSIS n sys/cdefs.h .Sh DESCRIPTION The n sys/cdefs.h header includes some common definitions and macros typical to the C language conventions of .Nx . Among these are: l -bullet -offset indent t Certain C language properties and definitions that are versioned according to the support in compilers. Examples include the .Em __func__ keyword and the .Em restrict type qualifier from .Tn C99 . t Macros and definitions specific to compilers, preprocessors, and linkers; see .Xr __BIT 3 , .Xr __BITS 3 , .Xr __CONCAT 3 , .Xr __FPTRCAST 3 , .Xr __SHIFTIN 3 , .Xr __SHIFTOUT 3 , .Xr __SHIFTOUT_MASK 3 , .Xr __UNCONST 3 , .Xr __UNVOLATILE 3 , .Xr __USE 3 , .Xr __insn_barrier 3 , and .Xr attribute 3 . t Utility macros provided for convenience; see .Xr __arraycount 3 and .Xr bits 3 . .El
p The header also contains the .Fn __RCSID and .Fn __KERNEL_RCSID macros used for version control system
q Tn VCS identifiers. Thus, all .Nx source code files typically include n sys/cdefs.h , included as the first thing right after any possible copyright texts; d -literal -offset indent /*- * Copyright (c) 1984 John Doe * All rights reserved. * * Redistribution and use in source and binary forms, * with or without modification, are permitted. */ #include <sys/cdefs.h> __RCSID("$NetBSD: cdefs.3,v 1.5 2019/11/10 18:45:09 christos Exp $"); .Ed
p It is possible to identify the .Tn RCS keyword strings by using .Xr ident 1 . .Sh SEE ALSO .Xr ident 1 , .Xr param 3 , .Xr stddef 3 , .Xr types 3 , .Xr c 7 .Sh HISTORY The n sys/cdefs.h header was originally imported from x 386 .