The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/cdefs.h

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    1 /*-
    2  * Copyright (c) 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Berkeley Software Design, Inc.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)cdefs.h     8.8 (Berkeley) 1/9/95
   33  * $FreeBSD: releng/8.3/sys/sys/cdefs.h 211959 2010-08-29 08:10:34Z kib $
   34  */
   35 
   36 #ifndef _SYS_CDEFS_H_
   37 #define _SYS_CDEFS_H_
   38 
   39 #if defined(__cplusplus)
   40 #define __BEGIN_DECLS   extern "C" {
   41 #define __END_DECLS     }
   42 #else
   43 #define __BEGIN_DECLS
   44 #define __END_DECLS
   45 #endif
   46 
   47 /*
   48  * This code has been put in place to help reduce the addition of
   49  * compiler specific defines in FreeBSD code.  It helps to aid in
   50  * having a compiler-agnostic source tree.
   51  */
   52 
   53 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
   54 
   55 #if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
   56 #define __GNUCLIKE_ASM 3
   57 #define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
   58 #else
   59 #define __GNUCLIKE_ASM 2
   60 #endif
   61 #define __GNUCLIKE___TYPEOF 1
   62 #define __GNUCLIKE___OFFSETOF 1
   63 #define __GNUCLIKE___SECTION 1
   64 
   65 #define __GNUCLIKE_ATTRIBUTE_MODE_DI 1
   66 
   67 #ifndef __INTEL_COMPILER
   68 # define __GNUCLIKE_CTOR_SECTION_HANDLING 1
   69 #endif
   70 
   71 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
   72 # if defined(__INTEL_COMPILER) && defined(__cplusplus) \
   73     && __INTEL_COMPILER < 800
   74 #  undef __GNUCLIKE_BUILTIN_CONSTANT_P
   75 # endif
   76 
   77 #if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3) && !defined(__INTEL_COMPILER)
   78 # define __GNUCLIKE_BUILTIN_VARARGS 1
   79 # define __GNUCLIKE_BUILTIN_STDARG 1
   80 # define __GNUCLIKE_BUILTIN_VAALIST 1
   81 #endif
   82 
   83 #if defined(__GNUC__)
   84 # define __GNUC_VA_LIST_COMPATIBILITY 1
   85 #endif
   86 
   87 #ifndef __INTEL_COMPILER
   88 # define __GNUCLIKE_BUILTIN_NEXT_ARG 1
   89 # define __GNUCLIKE_MATH_BUILTIN_RELOPS
   90 #endif
   91 
   92 #define __GNUCLIKE_BUILTIN_MEMCPY 1
   93 
   94 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
   95 #define __CC_SUPPORTS_INLINE 1
   96 #define __CC_SUPPORTS___INLINE 1
   97 #define __CC_SUPPORTS___INLINE__ 1
   98 
   99 #define __CC_SUPPORTS___FUNC__ 1
  100 #define __CC_SUPPORTS_WARNING 1
  101 
  102 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
  103 
  104 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
  105 
  106 #endif /* __GNUC__ || __INTEL_COMPILER */
  107 
  108 /*
  109  * Macro to test if we're using a specific version of gcc or later.
  110  */
  111 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
  112 #define __GNUC_PREREQ__(ma, mi) \
  113         (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
  114 #else
  115 #define __GNUC_PREREQ__(ma, mi) 0
  116 #endif
  117 
  118 /*
  119  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
  120  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
  121  * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
  122  * mode -- there must be no spaces between its arguments, and for nested
  123  * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
  124  * concatenate double-quoted strings produced by the __STRING macro, but
  125  * this only works with ANSI C.
  126  *
  127  * __XSTRING is like __STRING, but it expands any macros in its argument
  128  * first.  It is only available with ANSI C.
  129  */
  130 #if defined(__STDC__) || defined(__cplusplus)
  131 #define __P(protos)     protos          /* full-blown ANSI C */
  132 #define __CONCAT1(x,y)  x ## y
  133 #define __CONCAT(x,y)   __CONCAT1(x,y)
  134 #define __STRING(x)     #x              /* stringify without expanding x */
  135 #define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */
  136 
  137 #define __const         const           /* define reserved names to standard */
  138 #define __signed        signed
  139 #define __volatile      volatile
  140 #if defined(__cplusplus)
  141 #define __inline        inline          /* convert to C++ keyword */
  142 #else
  143 #if !(defined(__CC_SUPPORTS___INLINE))
  144 #define __inline                        /* delete GCC keyword */
  145 #endif /* ! __CC_SUPPORTS___INLINE */
  146 #endif /* !__cplusplus */
  147 
  148 #else   /* !(__STDC__ || __cplusplus) */
  149 #define __P(protos)     ()              /* traditional C preprocessor */
  150 #define __CONCAT(x,y)   x/**/y
  151 #define __STRING(x)     "x"
  152 
  153 #if !defined(__CC_SUPPORTS___INLINE)
  154 #define __const                         /* delete pseudo-ANSI C keywords */
  155 #define __inline
  156 #define __signed
  157 #define __volatile
  158 /*
  159  * In non-ANSI C environments, new programs will want ANSI-only C keywords
  160  * deleted from the program and old programs will want them left alone.
  161  * When using a compiler other than gcc, programs using the ANSI C keywords
  162  * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
  163  * When using "gcc -traditional", we assume that this is the intent; if
  164  * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
  165  */
  166 #ifndef NO_ANSI_KEYWORDS
  167 #define const                           /* delete ANSI C keywords */
  168 #define inline
  169 #define signed
  170 #define volatile
  171 #endif  /* !NO_ANSI_KEYWORDS */
  172 #endif  /* !__CC_SUPPORTS___INLINE */
  173 #endif  /* !(__STDC__ || __cplusplus) */
  174 
  175 /*
  176  * Compiler-dependent macros to help declare dead (non-returning) and
  177  * pure (no side effects) functions, and unused variables.  They are
  178  * null except for versions of gcc that are known to support the features
  179  * properly (old versions of gcc-2 supported the dead and pure features
  180  * in a different (wrong) way).  If we do not provide an implementation
  181  * for a given compiler, let the compile fail if it is told to use
  182  * a feature that we cannot live without.
  183  */
  184 #ifdef lint
  185 #define __dead2
  186 #define __pure2
  187 #define __unused
  188 #define __packed
  189 #define __aligned(x)
  190 #define __section(x)
  191 #else
  192 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
  193 #define __dead2
  194 #define __pure2
  195 #define __unused
  196 #endif
  197 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
  198 #define __dead2         __attribute__((__noreturn__))
  199 #define __pure2         __attribute__((__const__))
  200 #define __unused
  201 /* XXX Find out what to do for __packed, __aligned and __section */
  202 #endif
  203 #if __GNUC_PREREQ__(2, 7)
  204 #define __dead2         __attribute__((__noreturn__))
  205 #define __pure2         __attribute__((__const__))
  206 #define __unused        __attribute__((__unused__))
  207 #define __used          __attribute__((__used__))
  208 #define __packed        __attribute__((__packed__))
  209 #define __aligned(x)    __attribute__((__aligned__(x)))
  210 #define __section(x)    __attribute__((__section__(x)))
  211 #endif
  212 #if defined(__INTEL_COMPILER)
  213 #define __dead2         __attribute__((__noreturn__))
  214 #define __pure2         __attribute__((__const__))
  215 #define __unused        __attribute__((__unused__))
  216 #define __used          __attribute__((__used__))
  217 #define __packed        __attribute__((__packed__))
  218 #define __aligned(x)    __attribute__((__aligned__(x)))
  219 #define __section(x)    __attribute__((__section__(x)))
  220 #endif
  221 #endif
  222 
  223 #if __GNUC_PREREQ__(2, 96)
  224 #define __malloc_like   __attribute__((__malloc__))
  225 #define __pure          __attribute__((__pure__))
  226 #else
  227 #define __malloc_like
  228 #define __pure
  229 #endif
  230 
  231 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
  232 #define __always_inline __attribute__((__always_inline__))
  233 #else
  234 #define __always_inline
  235 #endif
  236 
  237 #if __GNUC_PREREQ__(4, 2) /* actually 4.1.3 */
  238 #define __gnu89_inline  __attribute__((__gnu_inline__)) __inline
  239 #else
  240 #define __gnu89_inline
  241 #endif
  242 
  243 #if __GNUC_PREREQ__(3, 1)
  244 #define __noinline      __attribute__ ((__noinline__))
  245 #else
  246 #define __noinline
  247 #endif
  248 
  249 #if __GNUC_PREREQ__(3, 3)
  250 #define __nonnull(x)    __attribute__((__nonnull__(x)))
  251 #else
  252 #define __nonnull(x)
  253 #endif
  254 
  255 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
  256 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  257 #define __func__        NULL
  258 #endif
  259 
  260 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
  261 #define __LONG_LONG_SUPPORTED
  262 #endif
  263 
  264 /*
  265  * GCC 2.95 provides `__restrict' as an extension to C90 to support the
  266  * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
  267  * a way to define the `restrict' type qualifier without disturbing older
  268  * software that is unaware of C99 keywords.
  269  */
  270 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
  271 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
  272 #define __restrict
  273 #else
  274 #define __restrict      restrict
  275 #endif
  276 #endif
  277 
  278 /*
  279  * GNU C version 2.96 adds explicit branch prediction so that
  280  * the CPU back-end can hint the processor and also so that
  281  * code blocks can be reordered such that the predicted path
  282  * sees a more linear flow, thus improving cache behavior, etc.
  283  *
  284  * The following two macros provide us with a way to utilize this
  285  * compiler feature.  Use __predict_true() if you expect the expression
  286  * to evaluate to true, and __predict_false() if you expect the
  287  * expression to evaluate to false.
  288  *
  289  * A few notes about usage:
  290  *
  291  *      * Generally, __predict_false() error condition checks (unless
  292  *        you have some _strong_ reason to do otherwise, in which case
  293  *        document it), and/or __predict_true() `no-error' condition
  294  *        checks, assuming you want to optimize for the no-error case.
  295  *
  296  *      * Other than that, if you don't know the likelihood of a test
  297  *        succeeding from empirical or other `hard' evidence, don't
  298  *        make predictions.
  299  *
  300  *      * These are meant to be used in places that are run `a lot'.
  301  *        It is wasteful to make predictions in code that is run
  302  *        seldomly (e.g. at subsystem initialization time) as the
  303  *        basic block reordering that this affects can often generate
  304  *        larger code.
  305  */
  306 #if __GNUC_PREREQ__(2, 96)
  307 #define __predict_true(exp)     __builtin_expect((exp), 1)
  308 #define __predict_false(exp)    __builtin_expect((exp), 0)
  309 #else
  310 #define __predict_true(exp)     (exp)
  311 #define __predict_false(exp)    (exp)
  312 #endif
  313 
  314 #if __GNUC_PREREQ__(4, 2)
  315 #define __hidden        __attribute__((__visibility__("hidden")))
  316 #define __exported      __attribute__((__visibility__("default")))
  317 #else
  318 #define __hidden
  319 #define __exported
  320 #endif
  321 
  322 /*
  323  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  324  * require it.
  325  */
  326 #if __GNUC_PREREQ__(4, 1)
  327 #define __offsetof(type, field)  __builtin_offsetof(type, field)
  328 #else
  329 #ifndef __cplusplus
  330 #define __offsetof(type, field) ((size_t)(&((type *)0)->field))
  331 #else
  332 #define __offsetof(type, field)                                 \
  333   (__offsetof__ (reinterpret_cast <size_t>                      \
  334                  (&reinterpret_cast <const volatile char &>     \
  335                   (static_cast<type *> (0)->field))))
  336 #endif
  337 #endif
  338 #define __rangeof(type, start, end) \
  339         (__offsetof(type, end) - __offsetof(type, start))
  340 
  341 /*
  342  * Compiler-dependent macros to declare that functions take printf-like
  343  * or scanf-like arguments.  They are null except for versions of gcc
  344  * that are known to support the features properly (old versions of gcc-2
  345  * didn't permit keeping the keywords out of the application namespace).
  346  */
  347 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  348 #define __printflike(fmtarg, firstvararg)
  349 #define __scanflike(fmtarg, firstvararg)
  350 #define __format_arg(fmtarg)
  351 #else
  352 #define __printflike(fmtarg, firstvararg) \
  353             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  354 #define __scanflike(fmtarg, firstvararg) \
  355             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  356 #define __format_arg(fmtarg)    __attribute__((__format_arg__ (fmtarg)))
  357 #endif
  358 
  359 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  360 #if __FreeBSD_cc_version >= 300001 && defined(__GNUC__) && !defined(__INTEL_COMPILER)
  361 #define __printf0like(fmtarg, firstvararg) \
  362             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  363 #else
  364 #define __printf0like(fmtarg, firstvararg)
  365 #endif
  366 
  367 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  368 #ifndef __INTEL_COMPILER
  369 #define __strong_reference(sym,aliassym)        \
  370         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
  371 #endif
  372 #ifdef __STDC__
  373 #define __weak_reference(sym,alias)     \
  374         __asm__(".weak " #alias);       \
  375         __asm__(".equ "  #alias ", " #sym)
  376 #define __warn_references(sym,msg)      \
  377         __asm__(".section .gnu.warning." #sym); \
  378         __asm__(".asciz \"" msg "\"");  \
  379         __asm__(".previous")
  380 #define __sym_compat(sym,impl,verid)    \
  381         __asm__(".symver " #impl ", " #sym "@" #verid)
  382 #define __sym_default(sym,impl,verid)   \
  383         __asm__(".symver " #impl ", " #sym "@@" #verid)
  384 #else
  385 #define __weak_reference(sym,alias)     \
  386         __asm__(".weak alias");         \
  387         __asm__(".equ alias, sym")
  388 #define __warn_references(sym,msg)      \
  389         __asm__(".section .gnu.warning.sym"); \
  390         __asm__(".asciz \"msg\"");      \
  391         __asm__(".previous")
  392 #define __sym_compat(sym,impl,verid)    \
  393         __asm__(".symver impl, sym@verid")
  394 #define __sym_default(impl,sym,verid)   \
  395         __asm__(".symver impl, sym@@verid")
  396 #endif  /* __STDC__ */
  397 #endif  /* __GNUC__ || __INTEL_COMPILER */
  398 
  399 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  400 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
  401 #else
  402 /*
  403  * The following definition might not work well if used in header files,
  404  * but it should be better than nothing.  If you want a "do nothing"
  405  * version, then it should generate some harmless declaration, such as:
  406  *    #define __IDSTRING(name,string)   struct __hack
  407  */
  408 #define __IDSTRING(name,string) static const char name[] __unused = string
  409 #endif
  410 
  411 /*
  412  * Embed the rcs id of a source file in the resulting library.  Note that in
  413  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
  414  * Usage:
  415  *      __FBSDID("$FreeBSD: releng/8.3/sys/sys/cdefs.h 211959 2010-08-29 08:10:34Z kib $");
  416  */
  417 #ifndef __FBSDID
  418 #if !defined(lint) && !defined(STRIP_FBSDID)
  419 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  420 #else
  421 #define __FBSDID(s)     struct __hack
  422 #endif
  423 #endif
  424 
  425 #ifndef __RCSID
  426 #ifndef NO__RCSID
  427 #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  428 #else
  429 #define __RCSID(s)      struct __hack
  430 #endif
  431 #endif
  432 
  433 #ifndef __RCSID_SOURCE
  434 #ifndef NO__RCSID_SOURCE
  435 #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
  436 #else
  437 #define __RCSID_SOURCE(s)       struct __hack
  438 #endif
  439 #endif
  440 
  441 #ifndef __SCCSID
  442 #ifndef NO__SCCSID
  443 #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
  444 #else
  445 #define __SCCSID(s)     struct __hack
  446 #endif
  447 #endif
  448 
  449 #ifndef __COPYRIGHT
  450 #ifndef NO__COPYRIGHT
  451 #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
  452 #else
  453 #define __COPYRIGHT(s)  struct __hack
  454 #endif
  455 #endif
  456 
  457 #ifndef __DECONST
  458 #define __DECONST(type, var)    ((type)(uintptr_t)(const void *)(var))
  459 #endif
  460 
  461 #ifndef __DEVOLATILE
  462 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
  463 #endif
  464 
  465 #ifndef __DEQUALIFY
  466 #define __DEQUALIFY(type, var)  ((type)(uintptr_t)(const volatile void *)(var))
  467 #endif
  468 
  469 /*-
  470  * The following definitions are an extension of the behavior originally
  471  * implemented in <sys/_posix.h>, but with a different level of granularity.
  472  * POSIX.1 requires that the macros we test be defined before any standard
  473  * header file is included.
  474  *
  475  * Here's a quick run-down of the versions:
  476  *  defined(_POSIX_SOURCE)              1003.1-1988
  477  *  _POSIX_C_SOURCE == 1                1003.1-1990
  478  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
  479  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
  480  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
  481  *                                      and the omnibus ISO/IEC 9945-1: 1996
  482  *  _POSIX_C_SOURCE == 200112           1003.1-2001
  483  *  _POSIX_C_SOURCE == 200809           1003.1-2008
  484  *
  485  * In addition, the X/Open Portability Guide, which is now the Single UNIX
  486  * Specification, defines a feature-test macro which indicates the version of
  487  * that specification, and which subsumes _POSIX_C_SOURCE.
  488  *
  489  * Our macros begin with two underscores to avoid namespace screwage.
  490  */
  491 
  492 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  493 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
  494 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
  495 #define _POSIX_C_SOURCE         199009
  496 #endif
  497 
  498 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  499 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
  500 #undef _POSIX_C_SOURCE
  501 #define _POSIX_C_SOURCE         199209
  502 #endif
  503 
  504 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  505 #ifdef _XOPEN_SOURCE
  506 #if _XOPEN_SOURCE - 0 >= 700
  507 #define __XSI_VISIBLE           700
  508 #undef _POSIX_C_SOURCE
  509 #define _POSIX_C_SOURCE         200809
  510 #elif _XOPEN_SOURCE - 0 >= 600
  511 #define __XSI_VISIBLE           600
  512 #undef _POSIX_C_SOURCE
  513 #define _POSIX_C_SOURCE         200112
  514 #elif _XOPEN_SOURCE - 0 >= 500
  515 #define __XSI_VISIBLE           500
  516 #undef _POSIX_C_SOURCE
  517 #define _POSIX_C_SOURCE         199506
  518 #endif
  519 #endif
  520 
  521 /*
  522  * Deal with all versions of POSIX.  The ordering relative to the tests above is
  523  * important.
  524  */
  525 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  526 #define _POSIX_C_SOURCE         198808
  527 #endif
  528 #ifdef _POSIX_C_SOURCE
  529 #if _POSIX_C_SOURCE >= 200809
  530 #define __POSIX_VISIBLE         200809
  531 #define __ISO_C_VISIBLE         1999
  532 #elif _POSIX_C_SOURCE >= 200112
  533 #define __POSIX_VISIBLE         200112
  534 #define __ISO_C_VISIBLE         1999
  535 #elif _POSIX_C_SOURCE >= 199506
  536 #define __POSIX_VISIBLE         199506
  537 #define __ISO_C_VISIBLE         1990
  538 #elif _POSIX_C_SOURCE >= 199309
  539 #define __POSIX_VISIBLE         199309
  540 #define __ISO_C_VISIBLE         1990
  541 #elif _POSIX_C_SOURCE >= 199209
  542 #define __POSIX_VISIBLE         199209
  543 #define __ISO_C_VISIBLE         1990
  544 #elif _POSIX_C_SOURCE >= 199009
  545 #define __POSIX_VISIBLE         199009
  546 #define __ISO_C_VISIBLE         1990
  547 #else
  548 #define __POSIX_VISIBLE         198808
  549 #define __ISO_C_VISIBLE         0
  550 #endif /* _POSIX_C_SOURCE */
  551 #else
  552 /*-
  553  * Deal with _ANSI_SOURCE:
  554  * If it is defined, and no other compilation environment is explicitly
  555  * requested, then define our internal feature-test macros to zero.  This
  556  * makes no difference to the preprocessor (undefined symbols in preprocessing
  557  * expressions are defined to have value zero), but makes it more convenient for
  558  * a test program to print out the values.
  559  *
  560  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
  561  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
  562  * environment (and in fact we will never get here).
  563  */
  564 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
  565 #define __POSIX_VISIBLE         0
  566 #define __XSI_VISIBLE           0
  567 #define __BSD_VISIBLE           0
  568 #define __ISO_C_VISIBLE         1990
  569 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
  570 #define __POSIX_VISIBLE         0
  571 #define __XSI_VISIBLE           0
  572 #define __BSD_VISIBLE           0
  573 #define __ISO_C_VISIBLE         1999
  574 #else                           /* Default environment: show everything. */
  575 #define __POSIX_VISIBLE         200809
  576 #define __XSI_VISIBLE           700
  577 #define __BSD_VISIBLE           1
  578 #define __ISO_C_VISIBLE         1999
  579 #endif
  580 #endif
  581 
  582 #endif /* !_SYS_CDEFS_H_ */

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