/usr/include/freebsd/sys/cdefs.h is in freebsd-glue 0.2.20.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Berkeley Software Design, Inc.
*
* 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.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* @(#)cdefs.h 8.8 (Berkeley) 1/9/95
* $FreeBSD$
*/
#ifndef _SYS_CDEFS_H_
#define _SYS_CDEFS_H_
#define __dead2 __attribute__((__noreturn__))
#define __pure2 __attribute__((__const__))
#ifndef __DO_NOT_DEFINE_UNUSED /* See <netdb.h> et al */
#define __unused __attribute__((__unused__))
#endif
#define __used __attribute__((__used__))
#define __packed __attribute__((__packed__))
#define __aligned(x) __attribute__((__aligned__(x)))
#define __section(x) __attribute__((__section__(x)))
#define __offsetof(type, field) __builtin_offsetof(type, field)
#define __printflike(fmtarg, firstvararg) \
__attribute__((__format__ (__printf__, fmtarg, firstvararg)))
#define __containerof(x, s, m) ({ \
const volatile __typeof(((s *)0)->m) *__x = (x); \
__DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
})
/* Requires freebsd-gcc extensions */
#define __printf0like(fmtarg, firstvararg)
#define __FBSDID(s) struct __hack
#define __RCSID(s) struct __hack
#define __RCSID_SOURCE(s) struct __hack
#define __SCCSID(s) struct __hack
#define __COPYRIGHT(s) struct __hack
#ifndef __DECONST
#define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var))
#endif
#ifndef __DEVOLATILE
#define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
#endif
#ifndef __DEQUALIFY
#define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
#endif
/* Fix for nested __CONCAT as used in <sys/elf.h>. */
#undef __CONCAT
#define __CONCAT1(x,y) x ## y
#define __CONCAT(x,y) __CONCAT1(x,y)
#endif
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