/*
 * 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__)
#define __GNUC_PREREQ__(ma, mi) \
        (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
#else
#define __GNUC_PREREQ__(ma, mi) 0
#endif

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

#if __GNUC_PREREQ__(4, 0)
#define __dso_public    __attribute__((__visibility__("default")))
#define __dso_hidden    __attribute__((__visibility__("hidden")))
#define __BEGIN_PUBLIC_DECLS \
                        _Pragma("GCC visibility push(default)") __BEGIN_EXTERN_C
#define __END_PUBLIC_DECLS \
                        __END_EXTERN_C _Pragma("GCC visibility pop")
#define __BEGIN_HIDDEN_DECLS \
                        _Pragma("GCC visibility push(hidden)") __BEGIN_EXTERN_C
#define __END_HIDDEN_DECLS \
                        __END_EXTERN_C _Pragma("GCC visibility pop")
#else
#define __dso_public
#define __dso_hidden
#define __BEGIN_PUBLIC_DECLS \
                        __BEGIN_EXTERN_C
#define __END_PUBLIC_DECLS \
                        __END_EXTERN_C
#define __BEGIN_HIDDEN_DECLS \
                        __BEGIN_EXTERN_C
#define __END_HIDDEN_DECLS \
                        __END_EXTERN_C
#endif

#if defined(__cplusplus)
#define __BEGIN_DECLS   __BEGIN_PUBLIC_DECLS
#define __END_DECLS     __END_PUBLIC_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 __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

/*
 * C99 allows the 'static' keyword in array declarators of function
 * parameter lists, such as:
 *      void bar(int myArray[static 10]);
 * However, this is allowed in C++, so define this __min_size() macro
 * to make headers usable in both languages.
 */
#if !defined(__cplusplus) && \
    (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901)
#define __min_size(x)   static (x)
#else
#define __min_size(x)   (x)
#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

/*
 * Given the pointer x to the member m of the struct s, return a pointer to
 * the containing structure.  When using GCC, we first assign pointer x to
 * a local variable, to check that its type is compatible with member m.
 */
#if __GNUC_PREREQ__(3, 1)
#define __containerof(x, s, m) ({                                       \
        const volatile __typeof(((s *)NULL)->m) *__x = (x);             \
        __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m)); \
})
#else
#define __containerof(x, s, m)                                          \
        __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
#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

/*
 * 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

#if __GNUC_PREREQ__(9, 1) || __has_attribute(__copy__)
#define __copy_attr(symbol)     __attribute__((__copy__(symbol)))
#else
#define __copy_attr(symbol)
#endif

#ifdef __GNUC__
#define __strong_reference(sym,aliassym) \
        extern __typeof (sym) aliassym  \
        __copy_attr(sym) __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

/*
 * GCC 4.7 has -std=c++11 but does not support thread_local.
 */
#if !__has_extension(c_thread_local)
#if (defined(__cplusplus) && __cplusplus >= 201103L && __GNUC_PREREQ__(4, 8)) || \
    __has_extension(cxx_thread_local)
#define _Thread_local           thread_local
#else
#define _Thread_local           __thread
#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_ */