text: /*
   * 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.
   * 3. 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: src/sys/sys/cdefs.h,v 1.28.2.8 2002/09/18 04:05:13 mikeh Exp $
   */
  
  #ifndef	_SYS_CDEFS_H_
  #define	_SYS_CDEFS_H_
  
  /*
   * Testing against Clang-specific extensions.
   */
  #ifndef	__has_attribute
  #define	__has_attribute(x)	0
  #endif
  #ifndef	__has_extension
  #define	__has_extension		__has_feature
  #endif
  #ifndef	__has_feature
  #define	__has_feature(x)	0
  #endif
  #ifndef	__has_include
  #define	__has_include(x)	0
  #endif
  #ifndef	__has_builtin
  #define	__has_builtin(x)	0
  #endif
  
  /*
   * Macro to test if we are using a specific version of gcc or later.
   */
  #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
  #define	__GNUC_PREREQ__(ma, mi)	\
          (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
  #else
  #define	__GNUC_PREREQ__(ma, mi) 0
  #endif
  
  #if defined(__cplusplus)
  #if __GNUC_PREREQ__(4, 0)
  #define	__BEGIN_DECLS	_Pragma("GCC visibility push(default)") extern "C" {
  #define	__END_DECLS	} _Pragma("GCC visibility pop")
  #else
  #define	__BEGIN_DECLS	extern "C" {
  #define	__END_DECLS	}
  #endif
  #else
  #define	__BEGIN_DECLS
  #define	__END_DECLS
  #endif
  
  /*
   * The __VM_CACHELINE_SIZE macro defines the common cache line alignment
   * size that can be found across most recent and somewhat latest Intel
   * hardware, i.e. L1 cache sizes etc.
   *
   * If needed, this value can be TUNED.  Suitable values for this macro
   * are 32, 64 and 128 bytes.  The unit of measurement for this macro is
   * bytes.
   *
   * XXX: This macro and related macros will eventually move to a MD
   * header, but currently, we do need such a hierarchy.
   */
  #define	__VM_CACHELINE_SIZE	64
  #define	__VM_CACHELINE_MASK	(__VM_CACHELINE_SIZE - 1)
  #define	__VM_CACHELINE_ALIGN(n)	\
  	(((n) + __VM_CACHELINE_MASK) & ~__VM_CACHELINE_MASK)
  
  /*
   * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
   * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
   * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
   * mode -- there must be no spaces between its arguments, and for nested
   * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
   * concatenate double-quoted strings produced by the __STRING macro, but
   * this only works with ANSI C.
   *
   * __XSTRING is like __STRING, but it expands any macros in its argument
   * first.  It is only available with ANSI C.
   */
  #if defined(__STDC__) || defined(__cplusplus)
  #define	__P(protos)	protos		/* full-blown ANSI C */
  #define	__CONCAT1(x,y)	x ## y
  #define	__CONCAT(x,y)	__CONCAT1(x,y)
  #define	__STRING(x)	#x		/* stringify without expanding x */
  #define	__XSTRING(x)	__STRING(x)	/* expand x, then stringify */
  
  #define	__const		const		/* define reserved names to standard */
  #define	__signed	signed
  #define	__volatile	volatile
  #if defined(__cplusplus)
  #define	__inline	inline		/* convert to C++ keyword */
  #else
  #ifndef __GNUC__
  #define	__inline			/* delete GCC keyword */
  #endif /* !__GNUC__ */
  #endif /* !__cplusplus */
  
  #else	/* !(__STDC__ || __cplusplus) */
  #define	__P(protos)	()		/* traditional C preprocessor */
  #define	__CONCAT(x,y)	x/**/y
  #define	__STRING(x)	"x"
  
  #ifndef __GNUC__
  #define	__const				/* delete pseudo-ANSI C keywords */
  #define	__inline
  #define	__signed
  #define	__volatile
  /*
   * In non-ANSI C environments, new programs will want ANSI-only C keywords
   * deleted from the program and old programs will want them left alone.
   * When using a compiler other than gcc, programs using the ANSI C keywords
   * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
   * When using "gcc -traditional", we assume that this is the intent; if
   * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
   */
  #ifndef	NO_ANSI_KEYWORDS
  #define	const				/* delete ANSI C keywords */
  #define	inline
  #define	signed
  #define	volatile
  #endif	/* !NO_ANSI_KEYWORDS */
  #endif	/* !__GNUC__ */
  #endif	/* !(__STDC__ || __cplusplus) */
  
  /*
   * Compiler-dependent macros to help declare dead (non-returning) and
   * pure (no side effects) functions, and unused variables.  They are
   * null except for versions of gcc that are known to support the features
   * properly (old versions of gcc-2 supported the dead and pure features
   * in a different (wrong) way).
   */
  #define	__weak_symbol	__attribute__((__weak__))
  #if __GNUC_PREREQ__(2, 7)
  #define	__dead2		__attribute__((__noreturn__))
  #define	__pure2		__attribute__((__const__))
  #define	__unused	__attribute__((__unused__))
  #define	__packed	__attribute__((__packed__))
  #define	__aligned(x)	__attribute__((__aligned__(x)))
  #define	__section(x)	__attribute__((__section__(x)))
  #else
  #define	__dead2
  #define	__pure2
  #define	__unused
  #endif
  
  #if __GNUC_PREREQ__(2, 96)
  #define	__malloclike	__attribute__((__malloc__))
  #define	__pure		__attribute__((__pure__))
  #else
  #define	__malloclike
  #define	__pure		__pure2
  #endif
  
  #if __GNUC_PREREQ__(3, 1)
  #define	__always_inline	__attribute__((__always_inline__))
  #define	__noinline	__attribute__((__noinline__))
  #else
  #define	__always_inline
  #define	__noinline
  #endif
  
  #if __GNUC_PREREQ__(3, 3)
  #define	__nonnull(...)	__attribute__((__nonnull__(__VA_ARGS__)))
  #define	__used		__attribute__((__used__))
  #else
  #define	__nonnull(...)
  #define	__used		__unused
  #endif
  
  #if __GNUC_PREREQ__(3, 4)
  #define	__heedresult	__attribute__((__warn_unused_result__))
  #else
  #define	__heedresult
  #endif
  
  #if __GNUC_PREREQ__(4, 1)
  #define	__returns_twice	__attribute__((__returns_twice__))
  #else
  #define	__returns_twice
  #endif
  
  #if __GNUC_PREREQ__(4, 6) || __has_builtin(__builtin_unreachable)
  #define	__unreachable()	__builtin_unreachable()
  #else
  #define	__unreachable()	((void)0)
  #endif
  
  #if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__)
  #define	__alloc_size(x)		__attribute__((__alloc_size__(x)))
  #define	__alloc_size2(n, x)	__attribute__((__alloc_size__(n, x)))
  #else
  #define	__alloc_size(x)
  #define	__alloc_size2(n, x)
  #endif
  
  #if __GNUC_PREREQ__(4, 9) || __has_attribute(__alloc_align__)
  #define	__alloc_align(x)	__attribute__((__alloc_align__(x)))
  #else
  #define	__alloc_align(x)
  #endif
  
  #if !__GNUC_PREREQ__(2, 7) && __STDC_VERSION__ < 199901
  #define	__func__	NULL
  #endif
  
  #if (__GNUC_PREREQ__(2, 0) && !defined(__STRICT_ANSI__)) || \
      __STDC_VERSION__ >= 199901
  #define	__LONG_LONG_SUPPORTED
  #endif
  
  /* C++11 exposes a load of C99 stuff */
  #if defined(__cplusplus) && __cplusplus >= 201103L
  #define	__LONG_LONG_SUPPORTED
  #ifndef	__STDC_LIMIT_MACROS
  #define	__STDC_LIMIT_MACROS
  #endif
  #ifndef	__STDC_CONSTANT_MACROS
  #define	__STDC_CONSTANT_MACROS
  #endif
  #endif
  
  /*
   * GCC 2.95 and later provides `__restrict' as an extension to C90 to support
   * the C99-specific `restrict' type qualifier.  We happen to use `__restrict'
   * as a way to define the `restrict' type qualifier without disturbing older
   * software that is unaware of C99 keywords.
   */
  #if !__GNUC_PREREQ__(2, 95)
  #if __STDC_VERSION__ < 199901
  #define	__restrict
  #else
  #define	__restrict	restrict
  #endif
  #endif
  
  /*
   * C99 allows to declare arrays as non-overlapping.
   */
  #if __GNUC_PREREQ__(3, 1) && !defined(__GNUG__)
  #define	__restrict_arr	__restrict
  #else
  #ifdef __GNUC__
  #define	__restrict_arr
  #else
  #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901
  #define	__restrict_arr	restrict
  #else
  #define	__restrict_arr
  #endif
  #endif
  #endif
  
  /*
   * GNU C version 2.96 adds explicit branch prediction so that
   * the CPU back-end can hint the processor and also so that
   * code blocks can be reordered such that the predicted path
   * sees a more linear flow, thus improving cache behavior, etc.
   *
   * The following two macros provide us with a way to utilize this
   * compiler feature.  Use __predict_true() if you expect the expression
   * to evaluate to true, and __predict_false() if you expect the
   * expression to evaluate to false.
   *
   * A few notes about usage:
   *
   *	* Generally, __predict_false() error condition checks (unless
   *	  you have some _strong_ reason to do otherwise, in which case
   *	  document it), and/or __predict_true() `no-error' condition
   *	  checks, assuming you want to optimize for the no-error case.
   *
   *	* Other than that, if you don't know the likelihood of a test
   *	  succeeding from empirical or other `hard' evidence, don't
   *	  make predictions.
   *
   *	* These are meant to be used in places that are run `a lot'.
   *	  It is wasteful to make predictions in code that is run
   *	  seldomly (e.g. at subsystem initialization time) as the
   *	  basic block reordering that this affects can often generate
   *	  larger code.
   */
  #if __GNUC_PREREQ__(2, 96)
  #define	__predict_true(exp)     __builtin_expect((exp), 1)
  #define	__predict_false(exp)    __builtin_expect((exp), 0)
  #else
  #define	__predict_true(exp)     (exp)
  #define	__predict_false(exp)    (exp)
  #endif
  
  /*
   * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
   * require it.
   */
  #if __GNUC_PREREQ__(4, 1)
  #define	__offsetof(type, field)	__builtin_offsetof(type, field)
  #else
  #ifndef __cplusplus
  #define	__offsetof(type, field) \
  	((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
  #else
  #define	__offsetof(type, field)					\
  	(__offsetof__ (reinterpret_cast <__size_t>		\
  		 (&reinterpret_cast <const volatile char &>	\
  		  (static_cast<type *> (0)->field))))
  #endif
  #endif
  
  /*
   * Compiler-dependent macros to declare that functions take printf-like
   * or scanf-like arguments.  They are null except for versions of gcc
   * that are known to support the features properly (old versions of gcc-2
   * didn't permit keeping the keywords out of the application namespace).
   *
   * The printf0like macro for GCC 2 uses DragonFly specific compiler extensions.
   */
  #if !__GNUC_PREREQ__(2, 7)
  #define	__printflike(fmtarg, firstvararg)
  #define	__scanflike(fmtarg, firstvararg)
  #define	__printf0like(fmtarg, firstvararg)
  #define	__format_arg(fmtarg)
  #define	__strfmonlike(fmtarg, firstvararg)
  #define	__strftimelike(fmtarg, firstvararg)
  
  #elif __GNUC_PREREQ__(3, 0)
  #define	__printflike(fmtarg, firstvararg) \
              __attribute__((__nonnull__(fmtarg), \
  			  __format__ (__printf__, fmtarg, firstvararg)))
  #define	__printf0like(fmtarg, firstvararg) \
              __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  #define	__scanflike(fmtarg, firstvararg) \
  	    __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  #define	__format_arg(fmtarg) \
  	    __attribute__((__format_arg__ (fmtarg)))
  #define	__strfmonlike(fmtarg, firstvararg) \
  	    __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
  #define	__strftimelike(fmtarg, firstvararg) \
  	    __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
  
  #else
  #define	__printflike(fmtarg, firstvararg) \
  	    __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  #define	__printf0like(fmtarg, firstvararg) \
  	    __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  #define	__scanflike(fmtarg, firstvararg) \
  	    __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  #define	__format_arg(fmtarg) \
  	    __attribute__((__format_arg__ (fmtarg)))
  #define	__strfmonlike(fmtarg, firstvararg) \
  	    __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
  #define	__strftimelike(fmtarg, firstvararg) \
  	    __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
  #endif
  
  #if !__GNUC_PREREQ__(3, 0)
  #define	__ARRAY_ZERO	0
  #else
  #define	__ARRAY_ZERO
  #endif
  
  #if __GNUC_PREREQ__(4, 0)
  #define	__dso_public	__attribute__((__visibility__("default")))
  #define	__dso_hidden	__attribute__((__visibility__("hidden")))
  #else
  #define	__dso_public
  #define	__dso_hidden
  #endif
  
  /*
   * A convenient constructor macro, GCC 4.3.0 added priority support to
   * constructors, provide a compatible interface for both.
   */
  #if __GNUC_PREREQ__(4, 3)
  #define	__constructor(prio)	__attribute__((constructor(prio)))
  #else
  #define	__constructor(prio)	__attribute__((constructor))
  #endif
  
  /*
   * Handy GCC based macros:
   *
   * 	__cachealign:
   *
   * 	The __cachealign macro can be used for cache line aligning structures
   * 	of small to medium size.  It aligns the particular structure or
   * 	storage type to a system default cache line alignment, thus giving us
   * 	a much more better cache utilization by making the hardware work at
   * 	its best burst speeds.
   *
   * 	__usereg:
   *
   * 	The __usereg macro can/should be used when a function contains
   * 	arguments not more than 3.  It can be very useful to us due to the
   * 	message-passing nature of the kernel.
   *
   * !!NOTE - USAGE INFORMATION!!
   *
   * The __cachealign macro should not be used for data structures that are
   * as big struct proc, struct vnode, struct thread, and other structs which
   * are as big as them; simply because it will be useless in that case.
   *
   * The __usereg macro should be used whenever possible, i.e., when a function
   * does not exceed more than 3 arguments, and should not be used for vararg
   * type functions.
   *
   * In other words, AVOID MISUSE OF THESE MACROS. :-)
   */
  #ifdef __GNUC__
  #define	__cachealign	__attribute__((__aligned__(__VM_CACHELINE_SIZE)))
  #define	__usereg	__attribute__((__regparm__(3)))
  #else
  #define	__cachealign
  #define	__usereg
  #endif
  
  #ifdef __GNUC__
  #define	__strong_reference(sym,aliassym)	\
  	extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
  #define	__weak_reference(sym,aliassym)	\
  	__strong_reference(sym,aliassym) __attribute__ ((__weak__))
  #define	__weak_reference_asm(sym,alias)	\
  	__asm__(".weak " #alias);	\
  	__asm__(".equ "  #alias ", " #sym)
  #define	__warn_references(sym,msg)	\
  	__asm__(".section .gnu.warning." #sym);	\
  	__asm__(".asciz \"" msg "\"");	\
  	__asm__(".previous")
  #define	__sym_compat(sym,impl,verid)	\
  	__asm__(".symver " #impl ", " #sym "@" #verid)
  #define	__sym_default(sym,impl,verid)	\
  	__asm__(".symver " #impl ", " #sym "@@@" #verid)
  #endif	/* __GNUC__ */
  
  #if defined(__GNUC__)
  #define	__IDSTRING(name,string)	__asm__(".ident\t\"" string "\"")
  #endif
  
  #ifndef	__RCSID
  #define	__RCSID(s)		struct __hack
  #endif
  
  #ifndef	__RCSID_SOURCE
  #define	__RCSID_SOURCE(s)	struct __hack
  #endif
  
  #ifndef	__SCCSID
  #define	__SCCSID(s)		struct __hack
  #endif
  
  #ifndef	__FBSDID
  #define	__FBSDID(s)		struct __hack
  #endif
  
  #ifndef	__COPYRIGHT
  #define	__COPYRIGHT(s)  	struct __hack
  #endif
  
  #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
  
  /*
   * Keywords added in C11.
   */
  
  #if !__GNUC_PREREQ__(2, 95)
  #define	__alignof(x)	__offsetof(struct { char __a; x __b; }, __b)
  #endif
  
  #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
  
  #if !__has_extension(c_alignas)
  #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
      __has_extension(cxx_alignas)
  #define	_Alignas(x)		alignas(x)
  #else
  /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
  #define	_Alignas(x)		__aligned(x)
  #endif
  #endif
  
  #if defined(__cplusplus) && __cplusplus >= 201103L
  #define	_Alignof(x)		alignof(x)
  #else
  #define	_Alignof(x)		__alignof(x)
  #endif
  
  #if !defined(_Noreturn)
  #define	_Noreturn		__dead2
  #endif
  
  #if !__has_extension(c_static_assert)
  #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
      __has_extension(cxx_static_assert)
  #define	_Static_assert(x, y)	static_assert(x, y)
  #elif !__GNUC_PREREQ__(4, 6)
  #define	_Static_assert(x, y)	struct __hack
  #ifdef _KERNEL
  #define	CTASSERT(x)		_CTASSERT(x, __LINE__)
  #define	_CTASSERT(x, y)		__CTASSERT(x, y)
  #define	__CTASSERT(x, y)	typedef char __assert ## y[(x) ? 1 : -1]
  #endif
  #endif
  #endif
  
  #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
  
  #if defined(_KERNEL) && !defined(CTASSERT)
  #define	CTASSERT(x)		_Static_assert(x, \
  				    "compile-time assertion failed")
  #endif
  
  /*
   * Emulation of C11 _Generic().  Unlike the previously defined C11
   * keywords, it is not possible to implement this using exactly the same
   * syntax.  Therefore implement something similar under the name
   * __generic().  Unlike _Generic(), this macro can only distinguish
   * between a single type, so it requires nested invocations to
   * distinguish multiple cases.
   */
  
  #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
  #define	__generic(expr, t, yes, no)					\
  	_Generic(expr, t: yes, default: no)
  #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
  #define	__generic(expr, t, yes, no)					\
  	__builtin_choose_expr(						\
  	    __builtin_types_compatible_p(__typeof(expr), t), yes, no)
  #endif
  
  /*-
   * POSIX.1 requires that the macros we test be defined before any standard
   * header file is included.
   *
   * Here's a quick run-down of the versions:
   *  defined(_POSIX_SOURCE)		1003.1-1988
   *  _POSIX_C_SOURCE == 1		1003.1-1990
   *  _POSIX_C_SOURCE == 2		1003.2-1992 C Language Binding Option
   *  _POSIX_C_SOURCE == 199309		1003.1b-1993
   *  _POSIX_C_SOURCE == 199506		1003.1c-1995, 1003.1i-1995,
   *					and the omnibus ISO/IEC 9945-1: 1996
   *  _POSIX_C_SOURCE == 200112		1003.1-2001
   *  _POSIX_C_SOURCE == 200809		1003.1-2008
   *
   * In addition, the X/Open Portability Guide, which is now the Single UNIX
   * Specification, defines a feature-test macro which indicates the version of
   * that specification, and which subsumes _POSIX_C_SOURCE.
   *
   * Our macros begin with two underscores to avoid namespace screwage.
   */
  
  /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 1
  #undef _POSIX_C_SOURCE		/* Probably illegal, but beyond caring now. */
  #define	_POSIX_C_SOURCE		199009
  #endif
  
  /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 2
  #undef _POSIX_C_SOURCE
  #define	_POSIX_C_SOURCE		199209
  #endif
  
  /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  #ifdef _XOPEN_SOURCE
  #if _XOPEN_SOURCE - 0 >= 700
  #define	__XSI_VISIBLE		700
  #undef _POSIX_C_SOURCE
  #define	_POSIX_C_SOURCE		200809
  #elif _XOPEN_SOURCE - 0 >= 600
  #define	__XSI_VISIBLE		600
  #undef _POSIX_C_SOURCE
  #define	_POSIX_C_SOURCE		200112
  #elif _XOPEN_SOURCE - 0 >= 500
  #define	__XSI_VISIBLE		500
  #undef _POSIX_C_SOURCE
  #define	_POSIX_C_SOURCE		199506
  #endif
  #endif
  
  /*
   * Deal with all versions of POSIX.  The ordering relative to the tests above is
   * important.
   */
  #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  #define	_POSIX_C_SOURCE		198808
  #endif
  #ifdef _POSIX_C_SOURCE
  #if (_POSIX_C_SOURCE - 0) >= 200809
  #define	__POSIX_VISIBLE		200809
  #define	__ISO_C_VISIBLE		1999
  #elif (_POSIX_C_SOURCE - 0) >= 200112
  #define	__POSIX_VISIBLE		200112
  #define	__ISO_C_VISIBLE		1999
  #elif (_POSIX_C_SOURCE - 0) >= 199506
  #define	__POSIX_VISIBLE		199506
  #define	__ISO_C_VISIBLE		1990
  #elif (_POSIX_C_SOURCE - 0) >= 199309
  #define	__POSIX_VISIBLE		199309
  #define	__ISO_C_VISIBLE		1990
  #elif (_POSIX_C_SOURCE - 0) >= 199209
  #define	__POSIX_VISIBLE		199209
  #define	__ISO_C_VISIBLE		1990
  #elif (_POSIX_C_SOURCE - 0) >= 199009
  #define	__POSIX_VISIBLE		199009
  #define	__ISO_C_VISIBLE		1990
  #else
  #define	__POSIX_VISIBLE		198808
  #define	__ISO_C_VISIBLE		0
  #endif /* _POSIX_C_SOURCE */
  #else
  /*-
   * Deal with _ANSI_SOURCE:
   * If it is defined, and no other compilation environment is explicitly
   * requested, then define our internal feature-test macros to zero.  This
   * makes no difference to the preprocessor (undefined symbols in preprocessing
   * expressions are defined to have value zero), but makes it more convenient for
   * a test program to print out the values.
   *
   * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
   * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
   * environment (and in fact we will never get here).
   */
  #if defined(_ANSI_SOURCE)	/* Hide almost everything. */
  #define	__POSIX_VISIBLE		0
  #define	__XSI_VISIBLE		0
  #define	__BSD_VISIBLE		0
  #define	__ISO_C_VISIBLE		1990
  #define	__EXT1_VISIBLE		0
  #elif defined(_C99_SOURCE)	/* Localism to specify strict C99 env. */
  #define	__POSIX_VISIBLE		0
  #define	__XSI_VISIBLE		0
  #define	__BSD_VISIBLE		0
  #define	__ISO_C_VISIBLE		1999
  #define	__EXT1_VISIBLE		0
  #elif defined(_C11_SOURCE)	/* Localism to specify strict C11 env. */
  #define	__POSIX_VISIBLE		0
  #define	__XSI_VISIBLE		0
  #define	__BSD_VISIBLE		0
  #define	__ISO_C_VISIBLE		2011
  #define	__EXT1_VISIBLE		0
  #else				/* Default environment: show everything. */
  #define	__POSIX_VISIBLE		200809
  #define	__XSI_VISIBLE		700
  #define	__BSD_VISIBLE		1
  #define	__ISO_C_VISIBLE		2011
  #define	__EXT1_VISIBLE		1
  #endif
  #endif
  
  /* User override __EXT1_VISIBLE */
  #if defined(__STDC_WANT_LIB_EXT1__)
  #undef	__EXT1_VISIBLE
  #if __STDC_WANT_LIB_EXT1__
  #define	__EXT1_VISIBLE		1
  #else
  #define	__EXT1_VISIBLE		0
  #endif
  #endif /* __STDC_WANT_LIB_EXT1__ */
  
  #ifndef __BSD_VISIBLE
  #define	__BSD_VISIBLE		0
  #endif
  #ifndef __EXT1_VISIBLE
  #define	__EXT1_VISIBLE		0
  #endif
  
  /*
   * GLOBL macro exists to preserve __start_set_* and __stop_set_* sections
   * of kernel modules which are discarded from binutils 2.17.50+ otherwise.
   */
  
  #define	__GLOBL1(sym)	__asm__(".globl " #sym)
  #define	__GLOBL(sym)	__GLOBL1(sym)
  
  #endif /* !_SYS_CDEFS_H_ */
  