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  * $FreeBSD$
   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 /* XXX: sys/dev/mpt/mpilib/mpi_type.h uses it, someone should review it */
  107 #define __CC_INT_IS_32BIT 1
  108 
  109 #endif /* __GNUC__ || __INTEL_COMPILER */
  110 
  111 /*
  112  * Macro to test if we're using a specific version of gcc or later.
  113  */
  114 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
  115 #define __GNUC_PREREQ__(ma, mi) \
  116         (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
  117 #else
  118 #define __GNUC_PREREQ__(ma, mi) 0
  119 #endif
  120 
  121 /*
  122  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
  123  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
  124  * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
  125  * mode -- there must be no spaces between its arguments, and for nested
  126  * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
  127  * concatenate double-quoted strings produced by the __STRING macro, but
  128  * this only works with ANSI C.
  129  *
  130  * __XSTRING is like __STRING, but it expands any macros in its argument
  131  * first.  It is only available with ANSI C.
  132  */
  133 #if defined(__STDC__) || defined(__cplusplus)
  134 #define __P(protos)     protos          /* full-blown ANSI C */
  135 #define __CONCAT1(x,y)  x ## y
  136 #define __CONCAT(x,y)   __CONCAT1(x,y)
  137 #define __STRING(x)     #x              /* stringify without expanding x */
  138 #define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */
  139 
  140 #define __const         const           /* define reserved names to standard */
  141 #define __signed        signed
  142 #define __volatile      volatile
  143 #if defined(__cplusplus)
  144 #define __inline        inline          /* convert to C++ keyword */
  145 #else
  146 #if !(defined(__CC_SUPPORTS___INLINE))
  147 #define __inline                        /* delete GCC keyword */
  148 #endif /* ! __CC_SUPPORTS___INLINE */
  149 #endif /* !__cplusplus */
  150 
  151 #else   /* !(__STDC__ || __cplusplus) */
  152 #define __P(protos)     ()              /* traditional C preprocessor */
  153 #define __CONCAT(x,y)   x/**/y
  154 #define __STRING(x)     "x"
  155 
  156 #if !defined(__CC_SUPPORTS___INLINE)
  157 #define __const                         /* delete pseudo-ANSI C keywords */
  158 #define __inline
  159 #define __signed
  160 #define __volatile
  161 /*
  162  * In non-ANSI C environments, new programs will want ANSI-only C keywords
  163  * deleted from the program and old programs will want them left alone.
  164  * When using a compiler other than gcc, programs using the ANSI C keywords
  165  * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
  166  * When using "gcc -traditional", we assume that this is the intent; if
  167  * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
  168  */
  169 #ifndef NO_ANSI_KEYWORDS
  170 #define const                           /* delete ANSI C keywords */
  171 #define inline
  172 #define signed
  173 #define volatile
  174 #endif  /* !NO_ANSI_KEYWORDS */
  175 #endif  /* !__CC_SUPPORTS___INLINE */
  176 #endif  /* !(__STDC__ || __cplusplus) */
  177 
  178 /*
  179  * Compiler-dependent macros to help declare dead (non-returning) and
  180  * pure (no side effects) functions, and unused variables.  They are
  181  * null except for versions of gcc that are known to support the features
  182  * properly (old versions of gcc-2 supported the dead and pure features
  183  * in a different (wrong) way).  If we do not provide an implementation
  184  * for a given compiler, let the compile fail if it is told to use
  185  * a feature that we cannot live without.
  186  */
  187 #ifdef lint
  188 #define __dead2
  189 #define __pure2
  190 #define __unused
  191 #define __packed
  192 #define __aligned(x)
  193 #define __section(x)
  194 #else
  195 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
  196 #define __dead2
  197 #define __pure2
  198 #define __unused
  199 #endif
  200 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
  201 #define __dead2         __attribute__((__noreturn__))
  202 #define __pure2         __attribute__((__const__))
  203 #define __unused
  204 /* XXX Find out what to do for __packed, __aligned and __section */
  205 #endif
  206 #if __GNUC_PREREQ__(2, 7)
  207 #define __dead2         __attribute__((__noreturn__))
  208 #define __pure2         __attribute__((__const__))
  209 #define __unused        __attribute__((__unused__))
  210 #define __used          __attribute__((__used__))
  211 #define __packed        __attribute__((__packed__))
  212 #define __aligned(x)    __attribute__((__aligned__(x)))
  213 #define __section(x)    __attribute__((__section__(x)))
  214 #endif
  215 #if defined(__INTEL_COMPILER)
  216 #define __dead2         __attribute__((__noreturn__))
  217 #define __pure2         __attribute__((__const__))
  218 #define __unused        __attribute__((__unused__))
  219 #define __used          __attribute__((__used__))
  220 #define __packed        __attribute__((__packed__))
  221 #define __aligned(x)    __attribute__((__aligned__(x)))
  222 #define __section(x)    __attribute__((__section__(x)))
  223 #endif
  224 #endif
  225 
  226 #if __GNUC_PREREQ__(2, 96)
  227 #define __pure          __attribute__((__pure__))
  228 #else
  229 #define __pure
  230 #endif
  231 
  232 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
  233 #define __always_inline __attribute__((__always_inline__))
  234 #else
  235 #define __always_inline
  236 #endif
  237 
  238 #if __GNUC_PREREQ__(4, 2) /* actually 4.1.3 */
  239 #define __gnu89_inline  __attribute__((__gnu_inline__)) __inline
  240 #else
  241 #define __gnu89_inline
  242 #endif
  243 
  244 #if __GNUC_PREREQ__(3, 1)
  245 #define __noinline      __attribute__ ((__noinline__))
  246 #else
  247 #define __noinline
  248 #endif
  249 
  250 #if __GNUC_PREREQ__(3, 3)
  251 #define __nonnull(x)    __attribute__((__nonnull__(x)))
  252 #else
  253 #define __nonnull(x)
  254 #endif
  255 
  256 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
  257 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  258 #define __func__        NULL
  259 #endif
  260 
  261 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
  262 #define __LONG_LONG_SUPPORTED
  263 #endif
  264 
  265 /*
  266  * GCC 2.95 provides `__restrict' as an extension to C90 to support the
  267  * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
  268  * a way to define the `restrict' type qualifier without disturbing older
  269  * software that is unaware of C99 keywords.
  270  */
  271 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
  272 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901
  273 #define __restrict
  274 #else
  275 #define __restrict      restrict
  276 #endif
  277 #endif
  278 
  279 /*
  280  * GNU C version 2.96 adds explicit branch prediction so that
  281  * the CPU back-end can hint the processor and also so that
  282  * code blocks can be reordered such that the predicted path
  283  * sees a more linear flow, thus improving cache behavior, etc.
  284  *
  285  * The following two macros provide us with a way to utilize this
  286  * compiler feature.  Use __predict_true() if you expect the expression
  287  * to evaluate to true, and __predict_false() if you expect the
  288  * expression to evaluate to false.
  289  *
  290  * A few notes about usage:
  291  *
  292  *      * Generally, __predict_false() error condition checks (unless
  293  *        you have some _strong_ reason to do otherwise, in which case
  294  *        document it), and/or __predict_true() `no-error' condition
  295  *        checks, assuming you want to optimize for the no-error case.
  296  *
  297  *      * Other than that, if you don't know the likelihood of a test
  298  *        succeeding from empirical or other `hard' evidence, don't
  299  *        make predictions.
  300  *
  301  *      * These are meant to be used in places that are run `a lot'.
  302  *        It is wasteful to make predictions in code that is run
  303  *        seldomly (e.g. at subsystem initialization time) as the
  304  *        basic block reordering that this affects can often generate
  305  *        larger code.
  306  */
  307 #if __GNUC_PREREQ__(2, 96)
  308 #define __predict_true(exp)     __builtin_expect((exp), 1)
  309 #define __predict_false(exp)    __builtin_expect((exp), 0)
  310 #else
  311 #define __predict_true(exp)     (exp)
  312 #define __predict_false(exp)    (exp)
  313 #endif
  314 
  315 /*
  316  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  317  * require it.
  318  */
  319 #if __GNUC_PREREQ__(4, 1)
  320 #define __offsetof(type, field)  __builtin_offsetof(type, field)
  321 #else
  322 #ifndef __cplusplus
  323 #define __offsetof(type, field) ((size_t)(&((type *)0)->field))
  324 #else
  325 #define __offsetof(type, field)                                 \
  326   (__offsetof__ (reinterpret_cast <size_t>                      \
  327                  (&reinterpret_cast <const volatile char &>     \
  328                   (static_cast<type *> (0)->field))))
  329 #endif
  330 #endif
  331 #define __rangeof(type, start, end) \
  332         (__offsetof(type, end) - __offsetof(type, start))
  333 
  334 /*
  335  * Compiler-dependent macros to declare that functions take printf-like
  336  * or scanf-like arguments.  They are null except for versions of gcc
  337  * that are known to support the features properly (old versions of gcc-2
  338  * didn't permit keeping the keywords out of the application namespace).
  339  */
  340 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  341 #define __printflike(fmtarg, firstvararg)
  342 #define __scanflike(fmtarg, firstvararg)
  343 #define __format_arg(fmtarg)
  344 #else
  345 #define __printflike(fmtarg, firstvararg) \
  346             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  347 #define __scanflike(fmtarg, firstvararg) \
  348             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  349 #define __format_arg(fmtarg)    __attribute__((__format_arg__ (fmtarg)))
  350 #endif
  351 
  352 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  353 #if __FreeBSD_cc_version >= 300001 && defined(__GNUC__) && !defined(__INTEL_COMPILER)
  354 #define __printf0like(fmtarg, firstvararg) \
  355             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  356 #else
  357 #define __printf0like(fmtarg, firstvararg)
  358 #endif
  359 
  360 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  361 #ifndef __INTEL_COMPILER
  362 #define __strong_reference(sym,aliassym)        \
  363         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
  364 #endif
  365 #ifdef __STDC__
  366 #define __weak_reference(sym,alias)     \
  367         __asm__(".weak " #alias);       \
  368         __asm__(".equ "  #alias ", " #sym)
  369 #define __warn_references(sym,msg)      \
  370         __asm__(".section .gnu.warning." #sym); \
  371         __asm__(".asciz \"" msg "\"");  \
  372         __asm__(".previous")
  373 #define __sym_compat(sym,impl,verid)    \
  374         __asm__(".symver " #impl ", " #sym "@" #verid)
  375 #define __sym_default(sym,impl,verid)   \
  376         __asm__(".symver " #impl ", " #sym "@@" #verid)
  377 #else
  378 #define __weak_reference(sym,alias)     \
  379         __asm__(".weak alias");         \
  380         __asm__(".equ alias, sym")
  381 #define __warn_references(sym,msg)      \
  382         __asm__(".section .gnu.warning.sym"); \
  383         __asm__(".asciz \"msg\"");      \
  384         __asm__(".previous")
  385 #define __sym_compat(sym,impl,verid)    \
  386         __asm__(".symver impl, sym@verid")
  387 #define __sym_default(impl,sym,verid)   \
  388         __asm__(".symver impl, sym@@verid")
  389 #endif  /* __STDC__ */
  390 #endif  /* __GNUC__ || __INTEL_COMPILER */
  391 
  392 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  393 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
  394 #else
  395 /*
  396  * The following definition might not work well if used in header files,
  397  * but it should be better than nothing.  If you want a "do nothing"
  398  * version, then it should generate some harmless declaration, such as:
  399  *    #define __IDSTRING(name,string)   struct __hack
  400  */
  401 #define __IDSTRING(name,string) static const char name[] __unused = string
  402 #endif
  403 
  404 /*
  405  * Embed the rcs id of a source file in the resulting library.  Note that in
  406  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
  407  * Usage:
  408  *      __FBSDID("$FreeBSD$");
  409  */
  410 #ifndef __FBSDID
  411 #if !defined(lint) && !defined(STRIP_FBSDID)
  412 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  413 #else
  414 #define __FBSDID(s)     struct __hack
  415 #endif
  416 #endif
  417 
  418 #ifndef __RCSID
  419 #ifndef NO__RCSID
  420 #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  421 #else
  422 #define __RCSID(s)      struct __hack
  423 #endif
  424 #endif
  425 
  426 #ifndef __RCSID_SOURCE
  427 #ifndef NO__RCSID_SOURCE
  428 #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
  429 #else
  430 #define __RCSID_SOURCE(s)       struct __hack
  431 #endif
  432 #endif
  433 
  434 #ifndef __SCCSID
  435 #ifndef NO__SCCSID
  436 #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
  437 #else
  438 #define __SCCSID(s)     struct __hack
  439 #endif
  440 #endif
  441 
  442 #ifndef __COPYRIGHT
  443 #ifndef NO__COPYRIGHT
  444 #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
  445 #else
  446 #define __COPYRIGHT(s)  struct __hack
  447 #endif
  448 #endif
  449 
  450 #ifndef __DECONST
  451 #define __DECONST(type, var)    ((type)(uintptr_t)(const void *)(var))
  452 #endif
  453 
  454 #ifndef __DEVOLATILE
  455 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
  456 #endif
  457 
  458 #ifndef __DEQUALIFY
  459 #define __DEQUALIFY(type, var)  ((type)(uintptr_t)(const volatile void *)(var))
  460 #endif
  461 
  462 /*-
  463  * The following definitions are an extension of the behavior originally
  464  * implemented in <sys/_posix.h>, but with a different level of granularity.
  465  * POSIX.1 requires that the macros we test be defined before any standard
  466  * header file is included.
  467  *
  468  * Here's a quick run-down of the versions:
  469  *  defined(_POSIX_SOURCE)              1003.1-1988
  470  *  _POSIX_C_SOURCE == 1                1003.1-1990
  471  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
  472  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
  473  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
  474  *                                      and the omnibus ISO/IEC 9945-1: 1996
  475  *  _POSIX_C_SOURCE == 200112           1003.1-2001
  476  *
  477  * In addition, the X/Open Portability Guide, which is now the Single UNIX
  478  * Specification, defines a feature-test macro which indicates the version of
  479  * that specification, and which subsumes _POSIX_C_SOURCE.
  480  *
  481  * Our macros begin with two underscores to avoid namespace screwage.
  482  */
  483 
  484 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  485 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
  486 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
  487 #define _POSIX_C_SOURCE         199009
  488 #endif
  489 
  490 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  491 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
  492 #undef _POSIX_C_SOURCE
  493 #define _POSIX_C_SOURCE         199209
  494 #endif
  495 
  496 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  497 #ifdef _XOPEN_SOURCE
  498 #if _XOPEN_SOURCE - 0 >= 600
  499 #define __XSI_VISIBLE           600
  500 #undef _POSIX_C_SOURCE
  501 #define _POSIX_C_SOURCE         200112
  502 #elif _XOPEN_SOURCE - 0 >= 500
  503 #define __XSI_VISIBLE           500
  504 #undef _POSIX_C_SOURCE
  505 #define _POSIX_C_SOURCE         199506
  506 #endif
  507 #endif
  508 
  509 /*
  510  * Deal with all versions of POSIX.  The ordering relative to the tests above is
  511  * important.
  512  */
  513 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  514 #define _POSIX_C_SOURCE         198808
  515 #endif
  516 #ifdef _POSIX_C_SOURCE
  517 #if _POSIX_C_SOURCE >= 200112
  518 #define __POSIX_VISIBLE         200112
  519 #define __ISO_C_VISIBLE         1999
  520 #elif _POSIX_C_SOURCE >= 199506
  521 #define __POSIX_VISIBLE         199506
  522 #define __ISO_C_VISIBLE         1990
  523 #elif _POSIX_C_SOURCE >= 199309
  524 #define __POSIX_VISIBLE         199309
  525 #define __ISO_C_VISIBLE         1990
  526 #elif _POSIX_C_SOURCE >= 199209
  527 #define __POSIX_VISIBLE         199209
  528 #define __ISO_C_VISIBLE         1990
  529 #elif _POSIX_C_SOURCE >= 199009
  530 #define __POSIX_VISIBLE         199009
  531 #define __ISO_C_VISIBLE         1990
  532 #else
  533 #define __POSIX_VISIBLE         198808
  534 #define __ISO_C_VISIBLE         0
  535 #endif /* _POSIX_C_SOURCE */
  536 #else
  537 /*-
  538  * Deal with _ANSI_SOURCE:
  539  * If it is defined, and no other compilation environment is explicitly
  540  * requested, then define our internal feature-test macros to zero.  This
  541  * makes no difference to the preprocessor (undefined symbols in preprocessing
  542  * expressions are defined to have value zero), but makes it more convenient for
  543  * a test program to print out the values.
  544  *
  545  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
  546  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
  547  * environment (and in fact we will never get here).
  548  */
  549 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
  550 #define __POSIX_VISIBLE         0
  551 #define __XSI_VISIBLE           0
  552 #define __BSD_VISIBLE           0
  553 #define __ISO_C_VISIBLE         1990
  554 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
  555 #define __POSIX_VISIBLE         0
  556 #define __XSI_VISIBLE           0
  557 #define __BSD_VISIBLE           0
  558 #define __ISO_C_VISIBLE         1999
  559 #else                           /* Default environment: show everything. */
  560 #define __POSIX_VISIBLE         200112
  561 #define __XSI_VISIBLE           600
  562 #define __BSD_VISIBLE           1
  563 #define __ISO_C_VISIBLE         1999
  564 #endif
  565 #endif
  566 
  567 #endif /* !_SYS_CDEFS_H_ */

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