The Design and Implementation of the FreeBSD Operating System, Second Edition
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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/9.0/sys/sys/cdefs.h 218824 2011-02-18 21:44:53Z nwhitehorn $
   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 #ifndef __INTEL_COMPILER
   66 # define __GNUCLIKE_CTOR_SECTION_HANDLING 1
   67 #endif
   68 
   69 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
   70 # if defined(__INTEL_COMPILER) && defined(__cplusplus) \
   71     && __INTEL_COMPILER < 800
   72 #  undef __GNUCLIKE_BUILTIN_CONSTANT_P
   73 # endif
   74 
   75 #if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3) && !defined(__INTEL_COMPILER)
   76 # define __GNUCLIKE_BUILTIN_VARARGS 1
   77 # define __GNUCLIKE_BUILTIN_STDARG 1
   78 # define __GNUCLIKE_BUILTIN_VAALIST 1
   79 #endif
   80 
   81 #if defined(__GNUC__)
   82 # define __GNUC_VA_LIST_COMPATIBILITY 1
   83 #endif
   84 
   85 #ifndef __INTEL_COMPILER
   86 # define __GNUCLIKE_BUILTIN_NEXT_ARG 1
   87 # define __GNUCLIKE_MATH_BUILTIN_RELOPS
   88 #endif
   89 
   90 #define __GNUCLIKE_BUILTIN_MEMCPY 1
   91 
   92 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
   93 #define __CC_SUPPORTS_INLINE 1
   94 #define __CC_SUPPORTS___INLINE 1
   95 #define __CC_SUPPORTS___INLINE__ 1
   96 
   97 #define __CC_SUPPORTS___FUNC__ 1
   98 #define __CC_SUPPORTS_WARNING 1
   99 
  100 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
  101 
  102 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
  103 
  104 #endif /* __GNUC__ || __INTEL_COMPILER */
  105 
  106 /*
  107  * Macro to test if we're using a specific version of gcc or later.
  108  */
  109 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
  110 #define __GNUC_PREREQ__(ma, mi) \
  111         (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
  112 #else
  113 #define __GNUC_PREREQ__(ma, mi) 0
  114 #endif
  115 
  116 /*
  117  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
  118  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
  119  * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
  120  * mode -- there must be no spaces between its arguments, and for nested
  121  * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
  122  * concatenate double-quoted strings produced by the __STRING macro, but
  123  * this only works with ANSI C.
  124  *
  125  * __XSTRING is like __STRING, but it expands any macros in its argument
  126  * first.  It is only available with ANSI C.
  127  */
  128 #if defined(__STDC__) || defined(__cplusplus)
  129 #define __P(protos)     protos          /* full-blown ANSI C */
  130 #define __CONCAT1(x,y)  x ## y
  131 #define __CONCAT(x,y)   __CONCAT1(x,y)
  132 #define __STRING(x)     #x              /* stringify without expanding x */
  133 #define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */
  134 
  135 #define __const         const           /* define reserved names to standard */
  136 #define __signed        signed
  137 #define __volatile      volatile
  138 #if defined(__cplusplus)
  139 #define __inline        inline          /* convert to C++ keyword */
  140 #else
  141 #if !(defined(__CC_SUPPORTS___INLINE))
  142 #define __inline                        /* delete GCC keyword */
  143 #endif /* ! __CC_SUPPORTS___INLINE */
  144 #endif /* !__cplusplus */
  145 
  146 #else   /* !(__STDC__ || __cplusplus) */
  147 #define __P(protos)     ()              /* traditional C preprocessor */
  148 #define __CONCAT(x,y)   x/**/y
  149 #define __STRING(x)     "x"
  150 
  151 #if !defined(__CC_SUPPORTS___INLINE)
  152 #define __const                         /* delete pseudo-ANSI C keywords */
  153 #define __inline
  154 #define __signed
  155 #define __volatile
  156 /*
  157  * In non-ANSI C environments, new programs will want ANSI-only C keywords
  158  * deleted from the program and old programs will want them left alone.
  159  * When using a compiler other than gcc, programs using the ANSI C keywords
  160  * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
  161  * When using "gcc -traditional", we assume that this is the intent; if
  162  * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
  163  */
  164 #ifndef NO_ANSI_KEYWORDS
  165 #define const                           /* delete ANSI C keywords */
  166 #define inline
  167 #define signed
  168 #define volatile
  169 #endif  /* !NO_ANSI_KEYWORDS */
  170 #endif  /* !__CC_SUPPORTS___INLINE */
  171 #endif  /* !(__STDC__ || __cplusplus) */
  172 
  173 /*
  174  * Compiler-dependent macros to help declare dead (non-returning) and
  175  * pure (no side effects) functions, and unused variables.  They are
  176  * null except for versions of gcc that are known to support the features
  177  * properly (old versions of gcc-2 supported the dead and pure features
  178  * in a different (wrong) way).  If we do not provide an implementation
  179  * for a given compiler, let the compile fail if it is told to use
  180  * a feature that we cannot live without.
  181  */
  182 #ifdef lint
  183 #define __dead2
  184 #define __pure2
  185 #define __unused
  186 #define __packed
  187 #define __aligned(x)
  188 #define __section(x)
  189 #else
  190 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
  191 #define __dead2
  192 #define __pure2
  193 #define __unused
  194 #endif
  195 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
  196 #define __dead2         __attribute__((__noreturn__))
  197 #define __pure2         __attribute__((__const__))
  198 #define __unused
  199 /* XXX Find out what to do for __packed, __aligned and __section */
  200 #endif
  201 #if __GNUC_PREREQ__(2, 7)
  202 #define __dead2         __attribute__((__noreturn__))
  203 #define __pure2         __attribute__((__const__))
  204 #define __unused        __attribute__((__unused__))
  205 #define __used          __attribute__((__used__))
  206 #define __packed        __attribute__((__packed__))
  207 #define __aligned(x)    __attribute__((__aligned__(x)))
  208 #define __section(x)    __attribute__((__section__(x)))
  209 #endif
  210 #if defined(__INTEL_COMPILER)
  211 #define __dead2         __attribute__((__noreturn__))
  212 #define __pure2         __attribute__((__const__))
  213 #define __unused        __attribute__((__unused__))
  214 #define __used          __attribute__((__used__))
  215 #define __packed        __attribute__((__packed__))
  216 #define __aligned(x)    __attribute__((__aligned__(x)))
  217 #define __section(x)    __attribute__((__section__(x)))
  218 #endif
  219 #endif
  220 
  221 #if __GNUC_PREREQ__(2, 96)
  222 #define __malloc_like   __attribute__((__malloc__))
  223 #define __pure          __attribute__((__pure__))
  224 #else
  225 #define __malloc_like
  226 #define __pure
  227 #endif
  228 
  229 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
  230 #define __always_inline __attribute__((__always_inline__))
  231 #else
  232 #define __always_inline
  233 #endif
  234 
  235 #if __GNUC_PREREQ__(3, 1)
  236 #define __noinline      __attribute__ ((__noinline__))
  237 #else
  238 #define __noinline
  239 #endif
  240 
  241 #if __GNUC_PREREQ__(3, 3)
  242 #define __nonnull(x)    __attribute__((__nonnull__(x)))
  243 #else
  244 #define __nonnull(x)
  245 #endif
  246 
  247 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
  248 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  249 #define __func__        NULL
  250 #endif
  251 
  252 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
  253 #define __LONG_LONG_SUPPORTED
  254 #endif
  255 
  256 /*
  257  * GCC 2.95 provides `__restrict' as an extension to C90 to support the
  258  * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
  259  * a way to define the `restrict' type qualifier without disturbing older
  260  * software that is unaware of C99 keywords.
  261  */
  262 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
  263 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
  264 #define __restrict
  265 #else
  266 #define __restrict      restrict
  267 #endif
  268 #endif
  269 
  270 /*
  271  * GNU C version 2.96 adds explicit branch prediction so that
  272  * the CPU back-end can hint the processor and also so that
  273  * code blocks can be reordered such that the predicted path
  274  * sees a more linear flow, thus improving cache behavior, etc.
  275  *
  276  * The following two macros provide us with a way to utilize this
  277  * compiler feature.  Use __predict_true() if you expect the expression
  278  * to evaluate to true, and __predict_false() if you expect the
  279  * expression to evaluate to false.
  280  *
  281  * A few notes about usage:
  282  *
  283  *      * Generally, __predict_false() error condition checks (unless
  284  *        you have some _strong_ reason to do otherwise, in which case
  285  *        document it), and/or __predict_true() `no-error' condition
  286  *        checks, assuming you want to optimize for the no-error case.
  287  *
  288  *      * Other than that, if you don't know the likelihood of a test
  289  *        succeeding from empirical or other `hard' evidence, don't
  290  *        make predictions.
  291  *
  292  *      * These are meant to be used in places that are run `a lot'.
  293  *        It is wasteful to make predictions in code that is run
  294  *        seldomly (e.g. at subsystem initialization time) as the
  295  *        basic block reordering that this affects can often generate
  296  *        larger code.
  297  */
  298 #if __GNUC_PREREQ__(2, 96)
  299 #define __predict_true(exp)     __builtin_expect((exp), 1)
  300 #define __predict_false(exp)    __builtin_expect((exp), 0)
  301 #else
  302 #define __predict_true(exp)     (exp)
  303 #define __predict_false(exp)    (exp)
  304 #endif
  305 
  306 #if __GNUC_PREREQ__(4, 2)
  307 #define __hidden        __attribute__((__visibility__("hidden")))
  308 #define __exported      __attribute__((__visibility__("default")))
  309 #else
  310 #define __hidden
  311 #define __exported
  312 #endif
  313 
  314 /*
  315  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  316  * require it.
  317  */
  318 #if __GNUC_PREREQ__(4, 1)
  319 #define __offsetof(type, field)  __builtin_offsetof(type, field)
  320 #else
  321 #ifndef __cplusplus
  322 #define __offsetof(type, field) ((size_t)(&((type *)0)->field))
  323 #else
  324 #define __offsetof(type, field)                                 \
  325   (__offsetof__ (reinterpret_cast <size_t>                      \
  326                  (&reinterpret_cast <const volatile char &>     \
  327                   (static_cast<type *> (0)->field))))
  328 #endif
  329 #endif
  330 #define __rangeof(type, start, end) \
  331         (__offsetof(type, end) - __offsetof(type, start))
  332 
  333 /*
  334  * Compiler-dependent macros to declare that functions take printf-like
  335  * or scanf-like arguments.  They are null except for versions of gcc
  336  * that are known to support the features properly (old versions of gcc-2
  337  * didn't permit keeping the keywords out of the application namespace).
  338  */
  339 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  340 #define __printflike(fmtarg, firstvararg)
  341 #define __scanflike(fmtarg, firstvararg)
  342 #define __format_arg(fmtarg)
  343 #else
  344 #define __printflike(fmtarg, firstvararg) \
  345             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  346 #define __scanflike(fmtarg, firstvararg) \
  347             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  348 #define __format_arg(fmtarg)    __attribute__((__format_arg__ (fmtarg)))
  349 #endif
  350 
  351 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  352 #if __FreeBSD_cc_version >= 300001 && defined(__GNUC__) && !defined(__INTEL_COMPILER)
  353 #define __printf0like(fmtarg, firstvararg) \
  354             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  355 #else
  356 #define __printf0like(fmtarg, firstvararg)
  357 #endif
  358 
  359 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  360 #ifndef __INTEL_COMPILER
  361 #define __strong_reference(sym,aliassym)        \
  362         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
  363 #endif
  364 #ifdef __STDC__
  365 #define __weak_reference(sym,alias)     \
  366         __asm__(".weak " #alias);       \
  367         __asm__(".equ "  #alias ", " #sym)
  368 #define __warn_references(sym,msg)      \
  369         __asm__(".section .gnu.warning." #sym); \
  370         __asm__(".asciz \"" msg "\"");  \
  371         __asm__(".previous")
  372 #define __sym_compat(sym,impl,verid)    \
  373         __asm__(".symver " #impl ", " #sym "@" #verid)
  374 #define __sym_default(sym,impl,verid)   \
  375         __asm__(".symver " #impl ", " #sym "@@" #verid)
  376 #else
  377 #define __weak_reference(sym,alias)     \
  378         __asm__(".weak alias");         \
  379         __asm__(".equ alias, sym")
  380 #define __warn_references(sym,msg)      \
  381         __asm__(".section .gnu.warning.sym"); \
  382         __asm__(".asciz \"msg\"");      \
  383         __asm__(".previous")
  384 #define __sym_compat(sym,impl,verid)    \
  385         __asm__(".symver impl, sym@verid")
  386 #define __sym_default(impl,sym,verid)   \
  387         __asm__(".symver impl, sym@@verid")
  388 #endif  /* __STDC__ */
  389 #endif  /* __GNUC__ || __INTEL_COMPILER */
  390 
  391 #define __GLOBL1(sym)   __asm__(".globl " #sym)
  392 #define __GLOBL(sym)    __GLOBL1(sym)
  393 
  394 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  395 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
  396 #else
  397 /*
  398  * The following definition might not work well if used in header files,
  399  * but it should be better than nothing.  If you want a "do nothing"
  400  * version, then it should generate some harmless declaration, such as:
  401  *    #define __IDSTRING(name,string)   struct __hack
  402  */
  403 #define __IDSTRING(name,string) static const char name[] __unused = string
  404 #endif
  405 
  406 /*
  407  * Embed the rcs id of a source file in the resulting library.  Note that in
  408  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
  409  * Usage:
  410  *      __FBSDID("$FreeBSD: releng/9.0/sys/sys/cdefs.h 218824 2011-02-18 21:44:53Z nwhitehorn $");
  411  */
  412 #ifndef __FBSDID
  413 #if !defined(lint) && !defined(STRIP_FBSDID)
  414 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  415 #else
  416 #define __FBSDID(s)     struct __hack
  417 #endif
  418 #endif
  419 
  420 #ifndef __RCSID
  421 #ifndef NO__RCSID
  422 #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  423 #else
  424 #define __RCSID(s)      struct __hack
  425 #endif
  426 #endif
  427 
  428 #ifndef __RCSID_SOURCE
  429 #ifndef NO__RCSID_SOURCE
  430 #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
  431 #else
  432 #define __RCSID_SOURCE(s)       struct __hack
  433 #endif
  434 #endif
  435 
  436 #ifndef __SCCSID
  437 #ifndef NO__SCCSID
  438 #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
  439 #else
  440 #define __SCCSID(s)     struct __hack
  441 #endif
  442 #endif
  443 
  444 #ifndef __COPYRIGHT
  445 #ifndef NO__COPYRIGHT
  446 #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
  447 #else
  448 #define __COPYRIGHT(s)  struct __hack
  449 #endif
  450 #endif
  451 
  452 #ifndef __DECONST
  453 #define __DECONST(type, var)    ((type)(uintptr_t)(const void *)(var))
  454 #endif
  455 
  456 #ifndef __DEVOLATILE
  457 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
  458 #endif
  459 
  460 #ifndef __DEQUALIFY
  461 #define __DEQUALIFY(type, var)  ((type)(uintptr_t)(const volatile void *)(var))
  462 #endif
  463 
  464 /*-
  465  * The following definitions are an extension of the behavior originally
  466  * implemented in <sys/_posix.h>, but with a different level of granularity.
  467  * POSIX.1 requires that the macros we test be defined before any standard
  468  * header file is included.
  469  *
  470  * Here's a quick run-down of the versions:
  471  *  defined(_POSIX_SOURCE)              1003.1-1988
  472  *  _POSIX_C_SOURCE == 1                1003.1-1990
  473  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
  474  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
  475  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
  476  *                                      and the omnibus ISO/IEC 9945-1: 1996
  477  *  _POSIX_C_SOURCE == 200112           1003.1-2001
  478  *  _POSIX_C_SOURCE == 200809           1003.1-2008
  479  *
  480  * In addition, the X/Open Portability Guide, which is now the Single UNIX
  481  * Specification, defines a feature-test macro which indicates the version of
  482  * that specification, and which subsumes _POSIX_C_SOURCE.
  483  *
  484  * Our macros begin with two underscores to avoid namespace screwage.
  485  */
  486 
  487 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  488 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
  489 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
  490 #define _POSIX_C_SOURCE         199009
  491 #endif
  492 
  493 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  494 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
  495 #undef _POSIX_C_SOURCE
  496 #define _POSIX_C_SOURCE         199209
  497 #endif
  498 
  499 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  500 #ifdef _XOPEN_SOURCE
  501 #if _XOPEN_SOURCE - 0 >= 700
  502 #define __XSI_VISIBLE           700
  503 #undef _POSIX_C_SOURCE
  504 #define _POSIX_C_SOURCE         200809
  505 #elif _XOPEN_SOURCE - 0 >= 600
  506 #define __XSI_VISIBLE           600
  507 #undef _POSIX_C_SOURCE
  508 #define _POSIX_C_SOURCE         200112
  509 #elif _XOPEN_SOURCE - 0 >= 500
  510 #define __XSI_VISIBLE           500
  511 #undef _POSIX_C_SOURCE
  512 #define _POSIX_C_SOURCE         199506
  513 #endif
  514 #endif
  515 
  516 /*
  517  * Deal with all versions of POSIX.  The ordering relative to the tests above is
  518  * important.
  519  */
  520 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  521 #define _POSIX_C_SOURCE         198808
  522 #endif
  523 #ifdef _POSIX_C_SOURCE
  524 #if _POSIX_C_SOURCE >= 200809
  525 #define __POSIX_VISIBLE         200809
  526 #define __ISO_C_VISIBLE         1999
  527 #elif _POSIX_C_SOURCE >= 200112
  528 #define __POSIX_VISIBLE         200112
  529 #define __ISO_C_VISIBLE         1999
  530 #elif _POSIX_C_SOURCE >= 199506
  531 #define __POSIX_VISIBLE         199506
  532 #define __ISO_C_VISIBLE         1990
  533 #elif _POSIX_C_SOURCE >= 199309
  534 #define __POSIX_VISIBLE         199309
  535 #define __ISO_C_VISIBLE         1990
  536 #elif _POSIX_C_SOURCE >= 199209
  537 #define __POSIX_VISIBLE         199209
  538 #define __ISO_C_VISIBLE         1990
  539 #elif _POSIX_C_SOURCE >= 199009
  540 #define __POSIX_VISIBLE         199009
  541 #define __ISO_C_VISIBLE         1990
  542 #else
  543 #define __POSIX_VISIBLE         198808
  544 #define __ISO_C_VISIBLE         0
  545 #endif /* _POSIX_C_SOURCE */
  546 #else
  547 /*-
  548  * Deal with _ANSI_SOURCE:
  549  * If it is defined, and no other compilation environment is explicitly
  550  * requested, then define our internal feature-test macros to zero.  This
  551  * makes no difference to the preprocessor (undefined symbols in preprocessing
  552  * expressions are defined to have value zero), but makes it more convenient for
  553  * a test program to print out the values.
  554  *
  555  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
  556  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
  557  * environment (and in fact we will never get here).
  558  */
  559 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
  560 #define __POSIX_VISIBLE         0
  561 #define __XSI_VISIBLE           0
  562 #define __BSD_VISIBLE           0
  563 #define __ISO_C_VISIBLE         1990
  564 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
  565 #define __POSIX_VISIBLE         0
  566 #define __XSI_VISIBLE           0
  567 #define __BSD_VISIBLE           0
  568 #define __ISO_C_VISIBLE         1999
  569 #else                           /* Default environment: show everything. */
  570 #define __POSIX_VISIBLE         200809
  571 #define __XSI_VISIBLE           700
  572 #define __BSD_VISIBLE           1
  573 #define __ISO_C_VISIBLE         1999
  574 #endif
  575 #endif
  576 
  577 #endif /* !_SYS_CDEFS_H_ */

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