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/6.0/sys/sys/cdefs.h 151167 2005-10-09 07:48:48Z netchild $
   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__(3, 3)
  239 #define __nonnull(x)    __attribute__((__nonnull__(x)))
  240 #else
  241 #define __nonnull(x)
  242 #endif
  243 
  244 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
  245 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  246 #define __func__        NULL
  247 #endif
  248 
  249 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
  250 #define __LONG_LONG_SUPPORTED
  251 #endif
  252 
  253 /*
  254  * GCC 2.95 provides `__restrict' as an extension to C90 to support the
  255  * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
  256  * a way to define the `restrict' type qualifier without disturbing older
  257  * software that is unaware of C99 keywords.
  258  */
  259 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
  260 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901
  261 #define __restrict
  262 #else
  263 #define __restrict      restrict
  264 #endif
  265 #endif
  266 
  267 /*
  268  * GNU C version 2.96 adds explicit branch prediction so that
  269  * the CPU back-end can hint the processor and also so that
  270  * code blocks can be reordered such that the predicted path
  271  * sees a more linear flow, thus improving cache behavior, etc.
  272  *
  273  * The following two macros provide us with a way to utilize this
  274  * compiler feature.  Use __predict_true() if you expect the expression
  275  * to evaluate to true, and __predict_false() if you expect the
  276  * expression to evaluate to false.
  277  *
  278  * A few notes about usage:
  279  *
  280  *      * Generally, __predict_false() error condition checks (unless
  281  *        you have some _strong_ reason to do otherwise, in which case
  282  *        document it), and/or __predict_true() `no-error' condition
  283  *        checks, assuming you want to optimize for the no-error case.
  284  *
  285  *      * Other than that, if you don't know the likelihood of a test
  286  *        succeeding from empirical or other `hard' evidence, don't
  287  *        make predictions.
  288  *
  289  *      * These are meant to be used in places that are run `a lot'.
  290  *        It is wasteful to make predictions in code that is run
  291  *        seldomly (e.g. at subsystem initialization time) as the
  292  *        basic block reordering that this affects can often generate
  293  *        larger code.
  294  */
  295 #if __GNUC_PREREQ__(2, 96)
  296 #define __predict_true(exp)     __builtin_expect((exp), 1)
  297 #define __predict_false(exp)    __builtin_expect((exp), 0)
  298 #else
  299 #define __predict_true(exp)     (exp)
  300 #define __predict_false(exp)    (exp)
  301 #endif
  302 
  303 /*
  304  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  305  * require it.
  306  */
  307 #ifndef __cplusplus
  308 #define __offsetof(type, field) ((size_t)(&((type *)0)->field))
  309 #else
  310 #define __offsetof(type, field)                                 \
  311   (__offsetof__ (reinterpret_cast <size_t>                      \
  312                  (&reinterpret_cast <const volatile char &>     \
  313                   (static_cast<type *> (0)->field))))
  314 #endif
  315 #define __rangeof(type, start, end) \
  316         (__offsetof(type, end) - __offsetof(type, start))
  317 
  318 /*
  319  * Compiler-dependent macros to declare that functions take printf-like
  320  * or scanf-like arguments.  They are null except for versions of gcc
  321  * that are known to support the features properly (old versions of gcc-2
  322  * didn't permit keeping the keywords out of the application namespace).
  323  */
  324 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  325 #define __printflike(fmtarg, firstvararg)
  326 #define __scanflike(fmtarg, firstvararg)
  327 #else
  328 #define __printflike(fmtarg, firstvararg) \
  329             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  330 #define __scanflike(fmtarg, firstvararg) \
  331             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  332 #endif
  333 
  334 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  335 #if __FreeBSD_cc_version >= 300001 && defined(__GNUC__) && !defined(__INTEL_COMPILER)
  336 #define __printf0like(fmtarg, firstvararg) \
  337             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  338 #else
  339 #define __printf0like(fmtarg, firstvararg)
  340 #endif
  341 
  342 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  343 #ifndef __INTEL_COMPILER
  344 #define __strong_reference(sym,aliassym)        \
  345         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)));
  346 #endif
  347 #ifdef __STDC__
  348 #define __weak_reference(sym,alias)     \
  349         __asm__(".weak " #alias);       \
  350         __asm__(".equ "  #alias ", " #sym)
  351 #define __warn_references(sym,msg)      \
  352         __asm__(".section .gnu.warning." #sym); \
  353         __asm__(".asciz \"" msg "\"");  \
  354         __asm__(".previous")
  355 #else
  356 #define __weak_reference(sym,alias)     \
  357         __asm__(".weak alias");         \
  358         __asm__(".equ alias, sym")
  359 #define __warn_references(sym,msg)      \
  360         __asm__(".section .gnu.warning.sym"); \
  361         __asm__(".asciz \"msg\"");      \
  362         __asm__(".previous")
  363 #endif  /* __STDC__ */
  364 #endif  /* __GNUC__ || __INTEL_COMPILER */
  365 
  366 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  367 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
  368 #else
  369 /*
  370  * The following definition might not work well if used in header files,
  371  * but it should be better than nothing.  If you want a "do nothing"
  372  * version, then it should generate some harmless declaration, such as:
  373  *    #define __IDSTRING(name,string)   struct __hack
  374  */
  375 #define __IDSTRING(name,string) static const char name[] __unused = string
  376 #endif
  377 
  378 /*
  379  * Embed the rcs id of a source file in the resulting library.  Note that in
  380  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
  381  * Usage:
  382  *      __FBSDID("$FreeBSD: releng/6.0/sys/sys/cdefs.h 151167 2005-10-09 07:48:48Z netchild $");
  383  */
  384 #ifndef __FBSDID
  385 #if !defined(lint) && !defined(STRIP_FBSDID)
  386 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  387 #else
  388 #define __FBSDID(s)     struct __hack
  389 #endif
  390 #endif
  391 
  392 #ifndef __RCSID
  393 #ifndef NO__RCSID
  394 #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  395 #else
  396 #define __RCSID(s)      struct __hack
  397 #endif
  398 #endif
  399 
  400 #ifndef __RCSID_SOURCE
  401 #ifndef NO__RCSID_SOURCE
  402 #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
  403 #else
  404 #define __RCSID_SOURCE(s)       struct __hack
  405 #endif
  406 #endif
  407 
  408 #ifndef __SCCSID
  409 #ifndef NO__SCCSID
  410 #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
  411 #else
  412 #define __SCCSID(s)     struct __hack
  413 #endif
  414 #endif
  415 
  416 #ifndef __COPYRIGHT
  417 #ifndef NO__COPYRIGHT
  418 #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
  419 #else
  420 #define __COPYRIGHT(s)  struct __hack
  421 #endif
  422 #endif
  423 
  424 #ifndef __DECONST
  425 #define __DECONST(type, var)    ((type)(uintptr_t)(const void *)(var))
  426 #endif
  427 
  428 #ifndef __DEVOLATILE
  429 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
  430 #endif
  431 
  432 #ifndef __DEQUALIFY
  433 #define __DEQUALIFY(type, var)  ((type)(uintptr_t)(const volatile void *)(var))
  434 #endif
  435 
  436 /*-
  437  * The following definitions are an extension of the behavior originally
  438  * implemented in <sys/_posix.h>, but with a different level of granularity.
  439  * POSIX.1 requires that the macros we test be defined before any standard
  440  * header file is included.
  441  *
  442  * Here's a quick run-down of the versions:
  443  *  defined(_POSIX_SOURCE)              1003.1-1988
  444  *  _POSIX_C_SOURCE == 1                1003.1-1990
  445  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
  446  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
  447  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
  448  *                                      and the omnibus ISO/IEC 9945-1: 1996
  449  *  _POSIX_C_SOURCE == 200112           1003.1-2001
  450  *
  451  * In addition, the X/Open Portability Guide, which is now the Single UNIX
  452  * Specification, defines a feature-test macro which indicates the version of
  453  * that specification, and which subsumes _POSIX_C_SOURCE.
  454  *
  455  * Our macros begin with two underscores to avoid namespace screwage.
  456  */
  457 
  458 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  459 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
  460 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
  461 #define _POSIX_C_SOURCE         199009
  462 #endif
  463 
  464 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  465 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
  466 #undef _POSIX_C_SOURCE
  467 #define _POSIX_C_SOURCE         199209
  468 #endif
  469 
  470 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  471 #ifdef _XOPEN_SOURCE
  472 #if _XOPEN_SOURCE - 0 >= 600
  473 #define __XSI_VISIBLE           600
  474 #undef _POSIX_C_SOURCE
  475 #define _POSIX_C_SOURCE         200112
  476 #elif _XOPEN_SOURCE - 0 >= 500
  477 #define __XSI_VISIBLE           500
  478 #undef _POSIX_C_SOURCE
  479 #define _POSIX_C_SOURCE         199506
  480 #endif
  481 #endif
  482 
  483 /*
  484  * Deal with all versions of POSIX.  The ordering relative to the tests above is
  485  * important.
  486  */
  487 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  488 #define _POSIX_C_SOURCE         198808
  489 #endif
  490 #ifdef _POSIX_C_SOURCE
  491 #if _POSIX_C_SOURCE >= 200112
  492 #define __POSIX_VISIBLE         200112
  493 #define __ISO_C_VISIBLE         1999
  494 #elif _POSIX_C_SOURCE >= 199506
  495 #define __POSIX_VISIBLE         199506
  496 #define __ISO_C_VISIBLE         1990
  497 #elif _POSIX_C_SOURCE >= 199309
  498 #define __POSIX_VISIBLE         199309
  499 #define __ISO_C_VISIBLE         1990
  500 #elif _POSIX_C_SOURCE >= 199209
  501 #define __POSIX_VISIBLE         199209
  502 #define __ISO_C_VISIBLE         1990
  503 #elif _POSIX_C_SOURCE >= 199009
  504 #define __POSIX_VISIBLE         199009
  505 #define __ISO_C_VISIBLE         1990
  506 #else
  507 #define __POSIX_VISIBLE         198808
  508 #define __ISO_C_VISIBLE         0
  509 #endif /* _POSIX_C_SOURCE */
  510 #else
  511 /*-
  512  * Deal with _ANSI_SOURCE:
  513  * If it is defined, and no other compilation environment is explicitly
  514  * requested, then define our internal feature-test macros to zero.  This
  515  * makes no difference to the preprocessor (undefined symbols in preprocessing
  516  * expressions are defined to have value zero), but makes it more convenient for
  517  * a test program to print out the values.
  518  *
  519  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
  520  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
  521  * environment (and in fact we will never get here).
  522  */
  523 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
  524 #define __POSIX_VISIBLE         0
  525 #define __XSI_VISIBLE           0
  526 #define __BSD_VISIBLE           0
  527 #define __ISO_C_VISIBLE         1990
  528 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
  529 #define __POSIX_VISIBLE         0
  530 #define __XSI_VISIBLE           0
  531 #define __BSD_VISIBLE           0
  532 #define __ISO_C_VISIBLE         1999
  533 #else                           /* Default environment: show everything. */
  534 #define __POSIX_VISIBLE         200112
  535 #define __XSI_VISIBLE           600
  536 #define __BSD_VISIBLE           1
  537 #define __ISO_C_VISIBLE         1999
  538 #endif
  539 #endif
  540 
  541 #endif /* !_SYS_CDEFS_H_ */

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