xnu-4570.31.3.tar.gz

[apple/xnu.git] / bsd / sys / cdefs.h

/*
 * Copyright (c) 2000-2016 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* Copyright 1995 NeXT Computer, Inc. All rights reserved. */
/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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
 */

#ifndef	_CDEFS_H_
#define	_CDEFS_H_

#if defined(__cplusplus)
#define	__BEGIN_DECLS	extern "C" {
#define	__END_DECLS	}
#else
#define	__BEGIN_DECLS
#define	__END_DECLS
#endif

/* This SDK is designed to work with clang and specific versions of
 * gcc >= 4.0 with Apple's patch sets */
#if !defined(__GNUC__) || __GNUC__ < 4
#warning "Unsupported compiler detected"
#endif

/*
 * Compatibility with compilers and environments that don't support compiler
 * feature checking function-like macros.
 */
#ifndef __has_builtin
#define __has_builtin(x) 0
#endif
#ifndef __has_include
#define __has_include(x) 0
#endif
#ifndef __has_feature
#define __has_feature(x) 0
#endif
#ifndef __has_attribute
#define __has_attribute(x) 0
#endif
#ifndef __has_extension
#define __has_extension(x) 0
#endif

/*
 * 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 -- make sure you don't put spaces
 * in between its arguments.  __CONCAT can also concatenate double-quoted
 * strings produced by the __STRING macro, but this only works with ANSI C.
 */
#if defined(__STDC__) || defined(__cplusplus)
#define	__P(protos)	protos		/* full-blown ANSI C */
#define	__CONCAT(x,y)	x ## y
#define	__STRING(x)	#x

#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
#endif	/* !__GNUC__ */

/*
 * 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		__const			/* convert ANSI C keywords */
#define	inline		__inline
#define	signed		__signed
#define	volatile	__volatile
#endif /* !NO_ANSI_KEYWORDS */
#endif /* !(__STDC__ || __cplusplus) */

#define __dead2		__attribute__((noreturn))
#define __pure2		__attribute__((const))

/* __unused denotes variables and functions that may not be used, preventing
 * the compiler from warning about it if not used.
 */
#define __unused	__attribute__((unused))

/* __used forces variables and functions to be included even if it appears
 * to the compiler that they are not used (and would thust be discarded).
 */
#define __used		__attribute__((used))

/* __deprecated causes the compiler to produce a warning when encountering
 * code using the deprecated functionality.
 * __deprecated_msg() does the same, and compilers that support it will print
 * a message along with the deprecation warning.
 * This may require turning on such warning with the -Wdeprecated flag.
 * __deprecated_enum_msg() should be used on enums, and compilers that support
 * it will print the deprecation warning.
 */
#define __deprecated	__attribute__((deprecated))

#if __has_extension(attribute_deprecated_with_message) || \
		(defined(__GNUC__) && ((__GNUC__ >= 5) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5))))
	#define __deprecated_msg(_msg) __attribute__((deprecated(_msg)))
#else
	#define __deprecated_msg(_msg) __attribute__((deprecated))
#endif

#if __has_extension(enumerator_attributes)
	#define __deprecated_enum_msg(_msg) __deprecated_msg(_msg)
#else
	#define __deprecated_enum_msg(_msg)
#endif

/* __unavailable causes the compiler to error out when encountering
 * code using the tagged function of variable.
 */
#define __unavailable	__attribute__((unavailable))

/* Delete pseudo-keywords wherever they are not available or needed. */
#ifndef __dead
#define	__dead
#define	__pure
#endif

/*
 * We use `__restrict' as a way to define the `restrict' type qualifier
 * without disturbing older software that is unaware of C99 keywords.
 */
#if __STDC_VERSION__ < 199901
#define __restrict
#else
#define __restrict	restrict
#endif

/* Compatibility with compilers and environments that don't support the
 * nullability feature.
 */

#if !__has_feature(nullability)
#ifndef __nullable
#define __nullable
#endif
#ifndef __nonnull
#define __nonnull
#endif
#ifndef __null_unspecified
#define __null_unspecified
#endif
#ifndef _Nullable
#define _Nullable
#endif
#ifndef _Nonnull
#define _Nonnull
#endif
#ifndef _Null_unspecified
#define _Null_unspecified
#endif
#endif

/*
 * __disable_tail_calls causes the compiler to not perform tail call
 * optimization inside the marked function.
 */
#if __has_attribute(disable_tail_calls)
#define __disable_tail_calls	__attribute__((__disable_tail_calls__))
#else
#define __disable_tail_calls
#endif

/*
 * __not_tail_called causes the compiler to prevent tail call optimization
 * on statically bound calls to the function.  It has no effect on indirect
 * calls.  Virtual functions, objective-c methods, and functions marked as
 * "always_inline" cannot be marked as __not_tail_called.
 */
#if __has_attribute(not_tail_called)
#define __not_tail_called	__attribute__((__not_tail_called__))
#else
#define __not_tail_called
#endif

/*
 * __result_use_check warns callers of a function that not using the function
 * return value is a bug, i.e. dismissing malloc() return value results in a
 * memory leak.
 */
#if __has_attribute(warn_unused_result)
#define __result_use_check __attribute__((__warn_unused_result__))
#else
#define __result_use_check
#endif

/*
 * __swift_unavailable causes the compiler to mark a symbol as specifically
 * unavailable in Swift, regardless of any other availability in C.
 */
#if __has_feature(attribute_availability_swift)
#define __swift_unavailable(_msg)	__attribute__((__availability__(swift, unavailable, message=_msg)))
#else
#define __swift_unavailable(_msg)
#endif

/* Declaring inline functions within headers is error-prone due to differences
 * across various versions of the C language and extensions.  __header_inline
 * can be used to declare inline functions within system headers.  In cases
 * where you want to force inlining instead of letting the compiler make
 * the decision, you can use __header_always_inline.
 *
 * Be aware that using inline for functions which compilers may also provide
 * builtins can behave differently under various compilers.  If you intend to
 * provide an inline version of such a function, you may want to use a macro
 * instead.
 *
 * The check for !__GNUC__ || __clang__ is because gcc doesn't correctly
 * support c99 inline in some cases:
 * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55965
 */

#if defined(__cplusplus) || \
    (__STDC_VERSION__ >= 199901L && \
     !defined(__GNUC_GNU_INLINE__) && \
     (!defined(__GNUC__) || defined(__clang__)))
# define __header_inline           inline
#elif defined(__GNUC__) && defined(__GNUC_STDC_INLINE__)
# define __header_inline           extern __inline __attribute__((__gnu_inline__))
#elif defined(__GNUC__)
# define __header_inline           extern __inline
#else
  /* If we land here, we've encountered an unsupported compiler,
   * so hopefully it understands static __inline as a fallback.
   */
# define __header_inline           static __inline
#endif

#ifdef __GNUC__
# define __header_always_inline    __header_inline __attribute__ ((__always_inline__))
#else
  /* Unfortunately, we're using a compiler that we don't know how to force to
   * inline.  Oh well.
   */
# define __header_always_inline    __header_inline
#endif

/*
 * Compiler-dependent macros that bracket portions of code where the
 * "-Wunreachable-code" warning should be ignored. Please use sparingly.
 */
#if defined(__clang__)
# define __unreachable_ok_push \
         _Pragma("clang diagnostic push") \
         _Pragma("clang diagnostic ignored \"-Wunreachable-code\"")
# define __unreachable_ok_pop \
         _Pragma("clang diagnostic pop")
#elif defined(__GNUC__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
# define __unreachable_ok_push \
         _Pragma("GCC diagnostic push") \
         _Pragma("GCC diagnostic ignored \"-Wunreachable-code\"")
# define __unreachable_ok_pop \
         _Pragma("GCC diagnostic pop")
#else
# define __unreachable_ok_push
# define __unreachable_ok_pop
#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.  Functions declared
 * with these attributes will cause compilation warnings if there is a
 * mismatch between the format string and subsequent function parameter
 * types.
 */
#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 __IDSTRING(name,string) static const char name[] __used = string

#ifndef __COPYRIGHT
#define __COPYRIGHT(s) __IDSTRING(copyright,s)
#endif

#ifndef __RCSID
#define __RCSID(s) __IDSTRING(rcsid,s)
#endif

#ifndef __SCCSID
#define __SCCSID(s) __IDSTRING(sccsid,s)
#endif

#ifndef __PROJECT_VERSION
#define __PROJECT_VERSION(s) __IDSTRING(project_version,s)
#endif

/* Source compatibility only, ID string not emitted in object file */
#ifndef __FBSDID
#define __FBSDID(s) 
#endif

#ifndef	__DECONST
#define	__DECONST(type, var)	__CAST_AWAY_QUALIFIER(var, const, type)
#endif

#ifndef	__DEVOLATILE
#define	__DEVOLATILE(type, var)	__CAST_AWAY_QUALIFIER(var, volatile, type)
#endif

#ifndef	__DEQUALIFY
#define	__DEQUALIFY(type, var)	__CAST_AWAY_QUALIFIER(var, const volatile, type)
#endif

/*
 * COMPILATION ENVIRONMENTS -- see compat(5) for additional detail
 *
 * DEFAULT	By default newly complied code will get POSIX APIs plus
 *		Apple API extensions in scope.
 *
 *		Most users will use this compilation environment to avoid
 *		behavioral differences between 32 and 64 bit code.
 *
 * LEGACY	Defining _NONSTD_SOURCE will get pre-POSIX APIs plus Apple
 *		API extensions in scope.
 *
 *		This is generally equivalent to the Tiger release compilation
 *		environment, except that it cannot be applied to 64 bit code;
 *		its use is discouraged.
 *
 *		We expect this environment to be deprecated in the future.
 *
 * STRICT	Defining _POSIX_C_SOURCE or _XOPEN_SOURCE restricts the
 *		available APIs to exactly the set of APIs defined by the
 *		corresponding standard, based on the value defined.
 *
 *		A correct, portable definition for _POSIX_C_SOURCE is 200112L.
 *		A correct, portable definition for _XOPEN_SOURCE is 600L.
 *
 *		Apple API extensions are not visible in this environment,
 *		which can cause Apple specific code to fail to compile,
 *		or behave incorrectly if prototypes are not in scope or
 *		warnings about missing prototypes are not enabled or ignored.
 *
 * In any compilation environment, for correct symbol resolution to occur,
 * function prototypes must be in scope.  It is recommended that all Apple
 * tools users add either the "-Wall" or "-Wimplicit-function-declaration"
 * compiler flags to their projects to be warned when a function is being
 * used without a prototype in scope.
 */

/* These settings are particular to each product. */
#ifdef KERNEL
#define __DARWIN_ONLY_64_BIT_INO_T	0
#define __DARWIN_ONLY_UNIX_CONFORMANCE	0
#define __DARWIN_ONLY_VERS_1050		0
#if defined(__x86_64__)
#define	__DARWIN_SUF_DARWIN14	"_darwin14"
#define	__DARWIN14_ALIAS(sym)	__asm("_" __STRING(sym) __DARWIN_SUF_DARWIN14)
#else
#define	__DARWIN14_ALIAS(sym)
#endif
#else /* !KERNEL */
#ifdef PLATFORM_iPhoneOS
/* Platform: iPhoneOS */
#define __DARWIN_ONLY_64_BIT_INO_T	1
#define __DARWIN_ONLY_UNIX_CONFORMANCE	1
#define __DARWIN_ONLY_VERS_1050		1
#endif /* PLATFORM_iPhoneOS */
#ifdef PLATFORM_iPhoneSimulator
/* Platform: iPhoneSimulator */
#define __DARWIN_ONLY_64_BIT_INO_T	1
#define __DARWIN_ONLY_UNIX_CONFORMANCE	1
#define __DARWIN_ONLY_VERS_1050		1
#endif /* PLATFORM_iPhoneSimulator */
#ifdef PLATFORM_tvOS
/* Platform: tvOS */
#define __DARWIN_ONLY_64_BIT_INO_T	1
#define __DARWIN_ONLY_UNIX_CONFORMANCE	1
#define __DARWIN_ONLY_VERS_1050		1
#endif /* PLATFORM_tvOS */
#ifdef PLATFORM_AppleTVOS
/* Platform: AppleTVOS */
#define __DARWIN_ONLY_64_BIT_INO_T	1
#define __DARWIN_ONLY_UNIX_CONFORMANCE	1
#define __DARWIN_ONLY_VERS_1050		1
#endif /* PLATFORM_AppleTVOS */
#ifdef PLATFORM_tvSimulator
/* Platform: tvSimulator */
#define __DARWIN_ONLY_64_BIT_INO_T	1
#define __DARWIN_ONLY_UNIX_CONFORMANCE	1
#define __DARWIN_ONLY_VERS_1050		1
#endif /* PLATFORM_tvSimulator */
#ifdef PLATFORM_AppleTVSimulator
/* Platform: AppleTVSimulator */
#define __DARWIN_ONLY_64_BIT_INO_T	1
#define __DARWIN_ONLY_UNIX_CONFORMANCE	1
#define __DARWIN_ONLY_VERS_1050		1
#endif /* PLATFORM_AppleTVSimulator */
#ifdef PLATFORM_iPhoneOSNano
/* Platform: iPhoneOSNano */
#define __DARWIN_ONLY_64_BIT_INO_T	1
#define __DARWIN_ONLY_UNIX_CONFORMANCE	1
#define __DARWIN_ONLY_VERS_1050		1
#endif /* PLATFORM_iPhoneOSNano */
#ifdef PLATFORM_iPhoneNanoSimulator
/* Platform: iPhoneNanoSimulator */
#define __DARWIN_ONLY_64_BIT_INO_T	1
#define __DARWIN_ONLY_UNIX_CONFORMANCE	1
#define __DARWIN_ONLY_VERS_1050		1
#endif /* PLATFORM_iPhoneNanoSimulator */
#ifdef PLATFORM_WatchOS
/* Platform: WatchOS */
#define __DARWIN_ONLY_64_BIT_INO_T	1
#define __DARWIN_ONLY_UNIX_CONFORMANCE	1
#define __DARWIN_ONLY_VERS_1050		1
#endif /* PLATFORM_WatchOS */
#ifdef PLATFORM_WatchSimulator
/* Platform: WatchSimulator */
#define __DARWIN_ONLY_64_BIT_INO_T	1
#define __DARWIN_ONLY_UNIX_CONFORMANCE	1
#define __DARWIN_ONLY_VERS_1050		1
#endif /* PLATFORM_WatchSimulator */
#ifdef PLATFORM_BridgeOS
/* Platform: BridgeOS */
#define __DARWIN_ONLY_64_BIT_INO_T	1
#define __DARWIN_ONLY_UNIX_CONFORMANCE	1
#define __DARWIN_ONLY_VERS_1050		1
#endif /* PLATFORM_BridgeOS */
#ifdef PLATFORM_MacOSX
/* Platform: MacOSX */
#define __DARWIN_ONLY_64_BIT_INO_T	0
/* #undef __DARWIN_ONLY_UNIX_CONFORMANCE (automatically set for 64-bit) */
#define __DARWIN_ONLY_VERS_1050		0
#endif /* PLATFORM_MacOSX */
#endif /* KERNEL */

/*
 * The __DARWIN_ALIAS macros are used to do symbol renaming; they allow
 * legacy code to use the old symbol, thus maintaining binary compatibility
 * while new code can use a standards compliant version of the same function.
 *
 * __DARWIN_ALIAS is used by itself if the function signature has not
 * changed, it is used along with a #ifdef check for __DARWIN_UNIX03
 * if the signature has changed.  Because the __LP64__ environment
 * only supports UNIX03 semantics it causes __DARWIN_UNIX03 to be
 * defined, but causes __DARWIN_ALIAS to do no symbol mangling.
 *
 * As a special case, when XCode is used to target a specific version of the
 * OS, the manifest constant __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
 * will be defined by the compiler, with the digits representing major version
 * time 100 + minor version times 10 (e.g. 10.5 := 1050).  If we are targeting
 * pre-10.5, and it is the default compilation environment, revert the
 * compilation environment to pre-__DARWIN_UNIX03.
 */
#if !defined(__DARWIN_ONLY_UNIX_CONFORMANCE)
#  if defined(__LP64__)
#    define __DARWIN_ONLY_UNIX_CONFORMANCE 1
#  else /* !__LP64__ */
#    define __DARWIN_ONLY_UNIX_CONFORMANCE 0
#  endif /* __LP64__ */
#endif /* !__DARWIN_ONLY_UNIX_CONFORMANCE */

#if !defined(__DARWIN_UNIX03)
#  if defined(KERNEL)
#    define __DARWIN_UNIX03	0
#  elif __DARWIN_ONLY_UNIX_CONFORMANCE
#    if defined(_NONSTD_SOURCE)
#      error "Can't define _NONSTD_SOURCE when only UNIX conformance is available."
#    endif /* _NONSTD_SOURCE */
#    define __DARWIN_UNIX03	1
#  elif defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && ((__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__-0) < 1040)
#    define __DARWIN_UNIX03	0
#  elif defined(_DARWIN_C_SOURCE) || defined(_XOPEN_SOURCE) || defined(_POSIX_C_SOURCE)
#    if defined(_NONSTD_SOURCE)
#      error "Can't define both _NONSTD_SOURCE and any of _DARWIN_C_SOURCE, _XOPEN_SOURCE or _POSIX_C_SOURCE."
#    endif /* _NONSTD_SOURCE */
#    define __DARWIN_UNIX03	1
#  elif defined(_NONSTD_SOURCE)
#    define __DARWIN_UNIX03	0
#  else /* default */
#    if defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && ((__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__-0) < 1050)
#      define __DARWIN_UNIX03	0
#    else /* __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1050 */
#      define __DARWIN_UNIX03	1
#    endif /* __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1050 */
#  endif /* _DARWIN_C_SOURCE || _XOPEN_SOURCE || _POSIX_C_SOURCE || __LP64__ */
#endif /* !__DARWIN_UNIX03 */

#if !defined(__DARWIN_64_BIT_INO_T)
#  if defined(KERNEL)
#    define __DARWIN_64_BIT_INO_T 0
#  elif defined(_DARWIN_USE_64_BIT_INODE)
#    if defined(_DARWIN_NO_64_BIT_INODE)
#      error "Can't define both _DARWIN_USE_64_BIT_INODE and _DARWIN_NO_64_BIT_INODE."
#    endif /* _DARWIN_NO_64_BIT_INODE */
#    define __DARWIN_64_BIT_INO_T 1
#  elif defined(_DARWIN_NO_64_BIT_INODE)
#    if __DARWIN_ONLY_64_BIT_INO_T
#      error "Can't define _DARWIN_NO_64_BIT_INODE when only 64-bit inodes are available."
#    endif /* __DARWIN_ONLY_64_BIT_INO_T */
#    define __DARWIN_64_BIT_INO_T 0
#  else /* default */
#    if __DARWIN_ONLY_64_BIT_INO_T
#      define __DARWIN_64_BIT_INO_T 1
#    elif defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && ((__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__-0) < 1060) || __DARWIN_UNIX03 == 0
#      define __DARWIN_64_BIT_INO_T 0
#    else /* default */
#      define __DARWIN_64_BIT_INO_T 1
#    endif /* __DARWIN_ONLY_64_BIT_INO_T */
#  endif
#endif /* !__DARWIN_64_BIT_INO_T */

#if !defined(__DARWIN_VERS_1050)
#  if defined(KERNEL)
#    define __DARWIN_VERS_1050 0
#  elif __DARWIN_ONLY_VERS_1050
#    define __DARWIN_VERS_1050 1
#  elif defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && ((__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__-0) < 1050) || __DARWIN_UNIX03 == 0
#    define __DARWIN_VERS_1050 0
#  else /* default */
#    define __DARWIN_VERS_1050 1
#  endif
#endif /* !__DARWIN_VERS_1050 */

#if !defined(__DARWIN_NON_CANCELABLE)
#  if defined(KERNEL)
#    define __DARWIN_NON_CANCELABLE 0
#  else /* default */
#    define __DARWIN_NON_CANCELABLE 0
#  endif
#endif /* !__DARWIN_NON_CANCELABLE */

/*
 * symbol suffixes used for symbol versioning
 */
#if __DARWIN_UNIX03
#  if __DARWIN_ONLY_UNIX_CONFORMANCE
#    define __DARWIN_SUF_UNIX03		/* nothing */
#  else /* !__DARWIN_ONLY_UNIX_CONFORMANCE */
#    define __DARWIN_SUF_UNIX03		"$UNIX2003"
#  endif /* __DARWIN_ONLY_UNIX_CONFORMANCE */

#  if __DARWIN_64_BIT_INO_T
#    if __DARWIN_ONLY_64_BIT_INO_T
#      define __DARWIN_SUF_64_BIT_INO_T	/* nothing */
#    else /* !__DARWIN_ONLY_64_BIT_INO_T */
#      define __DARWIN_SUF_64_BIT_INO_T	"$INODE64"
#    endif /* __DARWIN_ONLY_64_BIT_INO_T */
#  else /* !__DARWIN_64_BIT_INO_T */
#    define __DARWIN_SUF_64_BIT_INO_T	/* nothing */
#  endif /* __DARWIN_64_BIT_INO_T */

#  if __DARWIN_VERS_1050
#    if __DARWIN_ONLY_VERS_1050
#      define __DARWIN_SUF_1050		/* nothing */
#    else /* !__DARWIN_ONLY_VERS_1050 */
#      define __DARWIN_SUF_1050		"$1050"
#    endif /* __DARWIN_ONLY_VERS_1050 */
#  else /* !__DARWIN_VERS_1050 */
#    define __DARWIN_SUF_1050		/* nothing */
#  endif /* __DARWIN_VERS_1050 */

#  if __DARWIN_NON_CANCELABLE
#    define __DARWIN_SUF_NON_CANCELABLE	"$NOCANCEL"
#  else /* !__DARWIN_NON_CANCELABLE */
#    define __DARWIN_SUF_NON_CANCELABLE	/* nothing */
#  endif /* __DARWIN_NON_CANCELABLE */

#else /* !__DARWIN_UNIX03 */
#  define __DARWIN_SUF_UNIX03		/* nothing */
#  define __DARWIN_SUF_64_BIT_INO_T	/* nothing */
#  define __DARWIN_SUF_NON_CANCELABLE	/* nothing */
#  define __DARWIN_SUF_1050		/* nothing */
#endif /* __DARWIN_UNIX03 */

#define __DARWIN_SUF_EXTSN		"$DARWIN_EXTSN"

/*
 * symbol versioning macros
 */
#define __DARWIN_ALIAS(sym)		__asm("_" __STRING(sym) __DARWIN_SUF_UNIX03)
#define __DARWIN_ALIAS_C(sym)		__asm("_" __STRING(sym) __DARWIN_SUF_NON_CANCELABLE __DARWIN_SUF_UNIX03)
#define __DARWIN_ALIAS_I(sym)		__asm("_" __STRING(sym) __DARWIN_SUF_64_BIT_INO_T __DARWIN_SUF_UNIX03)
#define __DARWIN_NOCANCEL(sym)  	__asm("_" __STRING(sym) __DARWIN_SUF_NON_CANCELABLE)
#define __DARWIN_INODE64(sym)		__asm("_" __STRING(sym) __DARWIN_SUF_64_BIT_INO_T)

#define __DARWIN_1050(sym)		__asm("_" __STRING(sym) __DARWIN_SUF_1050)
#define __DARWIN_1050ALIAS(sym)		__asm("_" __STRING(sym) __DARWIN_SUF_1050 __DARWIN_SUF_UNIX03)
#define __DARWIN_1050ALIAS_C(sym)	__asm("_" __STRING(sym) __DARWIN_SUF_1050 __DARWIN_SUF_NON_CANCELABLE __DARWIN_SUF_UNIX03)
#define __DARWIN_1050ALIAS_I(sym)	__asm("_" __STRING(sym) __DARWIN_SUF_1050 __DARWIN_SUF_64_BIT_INO_T __DARWIN_SUF_UNIX03)
#define __DARWIN_1050INODE64(sym)	__asm("_" __STRING(sym) __DARWIN_SUF_1050 __DARWIN_SUF_64_BIT_INO_T)

#define __DARWIN_EXTSN(sym)		__asm("_" __STRING(sym) __DARWIN_SUF_EXTSN)
#define __DARWIN_EXTSN_C(sym)		__asm("_" __STRING(sym) __DARWIN_SUF_EXTSN __DARWIN_SUF_NON_CANCELABLE)

/*
 * symbol release macros
 */
#ifdef KERNEL
#define __DARWIN_ALIAS_STARTING(_mac, _iphone, x)
#else
#include <sys/_symbol_aliasing.h>

#if defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__)
#define __DARWIN_ALIAS_STARTING(_mac, _iphone, x)   __DARWIN_ALIAS_STARTING_IPHONE_##_iphone(x)
#elif defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)
#define __DARWIN_ALIAS_STARTING(_mac, _iphone, x)   __DARWIN_ALIAS_STARTING_MAC_##_mac(x)
#else
#define __DARWIN_ALIAS_STARTING(_mac, _iphone, x)   x
#endif
#endif /* KERNEL */


/*
 * POSIX.1 requires that the macros we test be defined before any standard
 * header file is included.  This permits us to convert values for feature
 * testing, as necessary, using only _POSIX_C_SOURCE.
 *
 * Here's a quick run-down of the versions:
 *  defined(_POSIX_SOURCE)		1003.1-1988
 *  _POSIX_C_SOURCE == 1L		1003.1-1990
 *  _POSIX_C_SOURCE == 2L		1003.2-1992 C Language Binding Option
 *  _POSIX_C_SOURCE == 199309L		1003.1b-1993
 *  _POSIX_C_SOURCE == 199506L		1003.1c-1995, 1003.1i-1995,
 *					and the omnibus ISO/IEC 9945-1: 1996
 *  _POSIX_C_SOURCE == 200112L		1003.1-2001
 *  _POSIX_C_SOURCE == 200809L		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.
 */

/* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1L. */
#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1L
#undef _POSIX_C_SOURCE
#define	_POSIX_C_SOURCE		199009L
#endif

/* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2L. */
#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2L
#undef _POSIX_C_SOURCE
#define	_POSIX_C_SOURCE		199209L
#endif

/* Deal with various X/Open Portability Guides and Single UNIX Spec. */
#ifdef _XOPEN_SOURCE
#if _XOPEN_SOURCE - 0L >= 700L && (!defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE - 0L < 200809L)
#undef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE         200809L
#elif _XOPEN_SOURCE - 0L >= 600L && (!defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE - 0L < 200112L)
#undef _POSIX_C_SOURCE
#define	_POSIX_C_SOURCE		200112L
#elif _XOPEN_SOURCE - 0L >= 500L && (!defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE - 0L < 199506L)
#undef _POSIX_C_SOURCE
#define	_POSIX_C_SOURCE		199506L
#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         198808L
#endif

/* POSIX C deprecation macros */
#ifdef KERNEL
#define __POSIX_C_DEPRECATED(ver)
#else
#include <sys/_posix_availability.h>

#define __POSIX_C_DEPRECATED(ver) ___POSIX_C_DEPRECATED_STARTING_##ver
#endif

/*
 * Set a single macro which will always be defined and can be used to determine
 * the appropriate namespace.  For POSIX, these values will correspond to
 * _POSIX_C_SOURCE value.  Currently there are two additional levels corresponding
 * to ANSI (_ANSI_SOURCE) and Darwin extensions (_DARWIN_C_SOURCE)
 */
#define __DARWIN_C_ANSI         010000L
#define __DARWIN_C_FULL         900000L

#if   defined(_ANSI_SOURCE)
#define __DARWIN_C_LEVEL        __DARWIN_C_ANSI
#elif defined(_POSIX_C_SOURCE) && !defined(_DARWIN_C_SOURCE) && !defined(_NONSTD_SOURCE)
#define __DARWIN_C_LEVEL        _POSIX_C_SOURCE
#else
#define __DARWIN_C_LEVEL        __DARWIN_C_FULL
#endif

/* If the developer has neither requested a strict language mode nor a version
 * of POSIX, turn on functionality provided by __STDC_WANT_LIB_EXT1__ as part
 * of __DARWIN_C_FULL.
 */
#if !defined(__STDC_WANT_LIB_EXT1__) && !defined(__STRICT_ANSI__) && __DARWIN_C_LEVEL >= __DARWIN_C_FULL
#define __STDC_WANT_LIB_EXT1__ 1
#endif

/*
 * long long is not supported in c89 (__STRICT_ANSI__), but g++ -ansi and
 * c99 still want long longs.  While not perfect, we allow long longs for
 * g++.
 */
#define	__DARWIN_NO_LONG_LONG	(defined(__STRICT_ANSI__) \
				&& (__STDC_VERSION__-0 < 199901L) \
				&& !defined(__GNUG__))

/*****************************************
 *  Public darwin-specific feature macros
 *****************************************/

/*
 * _DARWIN_FEATURE_64_BIT_INODE indicates that the ino_t type is 64-bit, and
 * structures modified for 64-bit inodes (like struct stat) will be used.
 */
#if __DARWIN_64_BIT_INO_T
#define _DARWIN_FEATURE_64_BIT_INODE		1
#endif

/*
 * _DARWIN_FEATURE_64_ONLY_BIT_INODE indicates that the ino_t type may only
 * be 64-bit; there is no support for 32-bit ino_t when this macro is defined
 * (and non-zero).  There is no struct stat64 either, as the regular
 * struct stat will already be the 64-bit version.
 */
#if __DARWIN_ONLY_64_BIT_INO_T
#define _DARWIN_FEATURE_ONLY_64_BIT_INODE	1
#endif

/*
 * _DARWIN_FEATURE_ONLY_VERS_1050 indicates that only those APIs updated
 * in 10.5 exists; no pre-10.5 variants are available.
 */
#if __DARWIN_ONLY_VERS_1050
#define _DARWIN_FEATURE_ONLY_VERS_1050		1
#endif

/*
 * _DARWIN_FEATURE_ONLY_UNIX_CONFORMANCE indicates only UNIX conforming API
 * are available (the legacy BSD APIs are not available)
 */
#if __DARWIN_ONLY_UNIX_CONFORMANCE
#define _DARWIN_FEATURE_ONLY_UNIX_CONFORMANCE	1
#endif

/*
 * _DARWIN_FEATURE_UNIX_CONFORMANCE indicates whether UNIX conformance is on,
 * and specifies the conformance level (3 is SUSv3)
 */
#if __DARWIN_UNIX03
#define _DARWIN_FEATURE_UNIX_CONFORMANCE	3
#endif

/* 
 * This macro casts away the qualifier from the variable
 *
 * Note: use at your own risk, removing qualifiers can result in
 * catastrophic run-time failures.
 */
#ifndef __CAST_AWAY_QUALIFIER
#define __CAST_AWAY_QUALIFIER(variable, qualifier, type)  (type) (long)(variable)
#endif

/*
 * __XNU_PRIVATE_EXTERN is a linkage decoration indicating that a symbol can be
 * used from other compilation units, but not other libraries or executables.
 */
#ifndef __XNU_PRIVATE_EXTERN
#define __XNU_PRIVATE_EXTERN __attribute__((visibility("hidden")))
#endif

/*
 * Architecture validation for current SDK
 */
#if !defined(__sys_cdefs_arch_unknown__) && defined(__i386__)
#elif !defined(__sys_cdefs_arch_unknown__) && defined(__x86_64__)
#elif !defined(__sys_cdefs_arch_unknown__) && defined(__arm__)
#elif !defined(__sys_cdefs_arch_unknown__) && defined(__arm64__)
#else
#error Unsupported architecture
#endif

#ifdef XNU_KERNEL_PRIVATE
/*
 * Selectively ignore cast alignment warnings
 */
#define __IGNORE_WCASTALIGN(x) _Pragma("clang diagnostic push")                     \
                               _Pragma("clang diagnostic ignored \"-Wcast-align\"") \
                               x;                                                   \
                               _Pragma("clang diagnostic pop")
#endif

#endif /* !_CDEFS_H_ */