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  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)cdefs.h     8.8 (Berkeley) 1/9/95
   37  * $FreeBSD: src/sys/sys/cdefs.h,v 1.28.2.8 2002/09/18 04:05:13 mikeh Exp $
   38  */
   39 
   40 #ifndef _SYS_CDEFS_H_
   41 #define _SYS_CDEFS_H_
   42 
   43 /*
   44  * Testing against Clang-specific extensions.
   45  */
   46 
   47 #ifndef __has_extension
   48 #define __has_extension         __has_feature
   49 #endif
   50 #ifndef __has_feature
   51 #define __has_feature(x)        0
   52 #endif
   53 #ifndef __has_include
   54 #define __has_include(x)        0
   55 #endif
   56 #ifndef __has_builtin
   57 #define __has_builtin(x)        0
   58 #endif
   59 
   60 /*
   61  * Macro to test if we are using a specific version of gcc or later.
   62  */
   63 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
   64 #define __GNUC_PREREQ__(ma, mi) \
   65         (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
   66 #else
   67 #define __GNUC_PREREQ__(ma, mi) 0
   68 #endif
   69 
   70 #if defined(__cplusplus)
   71 #if __GNUC_PREREQ__(4, 0)
   72 #define __BEGIN_DECLS   _Pragma("GCC visibility push(default)") extern "C" {
   73 #define __END_DECLS     } _Pragma("GCC visibility pop")
   74 #else
   75 #define __BEGIN_DECLS   extern "C" {
   76 #define __END_DECLS     }
   77 #endif
   78 #else
   79 #define __BEGIN_DECLS
   80 #define __END_DECLS
   81 #endif
   82 
   83 /*
   84  * The __VM_CACHELINE_SIZE macro defines the common cache line alignment
   85  * size that can be found across most recent and somewhat latest Intel
   86  * hardware, i.e. L1 cache sizes etc.
   87  *
   88  * If needed, this value can be TUNED.  Suitable values for this macro
   89  * are 32, 64 and 128 bytes.  The unit of measurement for this macro is
   90  * bytes.
   91  * 
   92  * XXX: This macro and related macros will eventually move to a MD
   93  * header, but currently, we do need such a hierarchy.
   94  */
   95 #define __VM_CACHELINE_SIZE     64
   96 #define __VM_CACHELINE_MASK     (__VM_CACHELINE_SIZE - 1)
   97 #define __VM_CACHELINE_ALIGN(n) \
   98         (((n) + __VM_CACHELINE_MASK) & ~__VM_CACHELINE_MASK)
   99 
  100 /*
  101  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
  102  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
  103  * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
  104  * mode -- there must be no spaces between its arguments, and for nested
  105  * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
  106  * concatenate double-quoted strings produced by the __STRING macro, but
  107  * this only works with ANSI C.
  108  *
  109  * __XSTRING is like __STRING, but it expands any macros in its argument
  110  * first.  It is only available with ANSI C.
  111  */
  112 #if defined(__STDC__) || defined(__cplusplus)
  113 #define __P(protos)     protos          /* full-blown ANSI C */
  114 #define __CONCAT1(x,y)  x ## y
  115 #define __CONCAT(x,y)   __CONCAT1(x,y)
  116 #define __STRING(x)     #x              /* stringify without expanding x */
  117 #define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */
  118 
  119 #define __const         const           /* define reserved names to standard */
  120 #define __signed        signed
  121 #define __volatile      volatile
  122 #if defined(__cplusplus)
  123 #define __inline        inline          /* convert to C++ keyword */
  124 #else
  125 #ifndef __GNUC__
  126 #define __inline                        /* delete GCC keyword */
  127 #endif /* !__GNUC__ */
  128 #endif /* !__cplusplus */
  129 
  130 #else   /* !(__STDC__ || __cplusplus) */
  131 #define __P(protos)     ()              /* traditional C preprocessor */
  132 #define __CONCAT(x,y)   x/**/y
  133 #define __STRING(x)     "x"
  134 
  135 #ifndef __GNUC__
  136 #define __const                         /* delete pseudo-ANSI C keywords */
  137 #define __inline
  138 #define __signed
  139 #define __volatile
  140 /*
  141  * In non-ANSI C environments, new programs will want ANSI-only C keywords
  142  * deleted from the program and old programs will want them left alone.
  143  * When using a compiler other than gcc, programs using the ANSI C keywords
  144  * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
  145  * When using "gcc -traditional", we assume that this is the intent; if
  146  * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
  147  */
  148 #ifndef NO_ANSI_KEYWORDS
  149 #define const                           /* delete ANSI C keywords */
  150 #define inline
  151 #define signed
  152 #define volatile
  153 #endif  /* !NO_ANSI_KEYWORDS */
  154 #endif  /* !__GNUC__ */
  155 #endif  /* !(__STDC__ || __cplusplus) */
  156 
  157 /*
  158  * Compiler-dependent macros to help declare dead (non-returning) and
  159  * pure (no side effects) functions, and unused variables.  They are
  160  * null except for versions of gcc that are known to support the features
  161  * properly (old versions of gcc-2 supported the dead and pure features
  162  * in a different (wrong) way).
  163  */
  164 #ifdef lint
  165 
  166 #define __dead2
  167 #define __pure
  168 #define __pure2
  169 #define __unused
  170 #define __packed
  171 #define __aligned(x)
  172 #define __section(x)
  173 #define __always_inline
  174 #define __nonnull(x)
  175 
  176 #else
  177 
  178 #if !__GNUC_PREREQ__(2, 7)
  179 #define __dead2
  180 #define __pure2
  181 #define __unused
  182 #endif
  183 
  184 #if __GNUC_PREREQ__(2, 7)
  185 #define __dead2         __attribute__((__noreturn__))
  186 #define __pure2         __attribute__((__const__))
  187 #define __unused        __attribute__((__unused__))
  188 #define __packed        __attribute__((__packed__))
  189 #define __aligned(x)    __attribute__((__aligned__(x)))
  190 #define __section(x)    __attribute__((__section__(x)))
  191 #endif
  192 
  193 #if __GNUC_PREREQ__(2, 96)
  194 #define __pure          __attribute__((__pure__))
  195 #else
  196 #define __pure          __pure2
  197 #endif
  198 
  199 #if __GNUC_PREREQ__(3, 1)
  200 #define __always_inline __attribute__((__always_inline__))
  201 #define __noinline      __attribute__((__noinline__))
  202 #else
  203 #define __always_inline
  204 #define __noinline
  205 #endif
  206 
  207 #if __GNUC_PREREQ__(3, 3)
  208 #define __nonnull(x)    __attribute__((__nonnull__(x)))
  209 #define __used          __attribute__((__used__))
  210 #else
  211 #define __nonnull(x)
  212 #define __used          __unused
  213 #endif
  214 
  215 #endif  /* LINT */
  216 
  217 #if !__GNUC_PREREQ__(2, 7) && __STDC_VERSION < 199901
  218 #define __func__        NULL
  219 #endif
  220 
  221 #if (__GNUC_PREREQ__(2, 0) && !defined(__STRICT_ANSI)) || \
  222     __STDC_VERSION__ >= 199901
  223 #define __LONG_LONG_SUPPORTED
  224 #endif
  225 
  226 /*
  227  * GNU C version 2.96 adds explicit branch prediction so that
  228  * the CPU back-end can hint the processor and also so that
  229  * code blocks can be reordered such that the predicted path
  230  * sees a more linear flow, thus improving cache behavior, etc.
  231  *
  232  * The following two macros provide us with a way to utilize this
  233  * compiler feature.  Use __predict_true() if you expect the expression
  234  * to evaluate to true, and __predict_false() if you expect the
  235  * expression to evaluate to false.
  236  *
  237  * A few notes about usage:
  238  *
  239  *      * Generally, __predict_false() error condition checks (unless
  240  *        you have some _strong_ reason to do otherwise, in which case
  241  *        document it), and/or __predict_true() `no-error' condition
  242  *        checks, assuming you want to optimize for the no-error case.
  243  *
  244  *      * Other than that, if you don't know the likelihood of a test
  245  *        succeeding from empirical or other `hard' evidence, don't
  246  *        make predictions.
  247  *
  248  *      * These are meant to be used in places that are run `a lot'.
  249  *        It is wasteful to make predictions in code that is run
  250  *        seldomly (e.g. at subsystem initialization time) as the
  251  *        basic block reordering that this affects can often generate
  252  *        larger code.
  253  */
  254 #if __GNUC_PREREQ__(2, 96)
  255 #define __predict_true(exp)     __builtin_expect((exp), 1)
  256 #define __predict_false(exp)    __builtin_expect((exp), 0)
  257 #else
  258 #define __predict_true(exp)     (exp)
  259 #define __predict_false(exp)    (exp)
  260 #endif
  261 
  262 /*
  263  * GCC 2.95 and later provides `__restrict' as an extention to C90 to support
  264  * the C99-specific `restrict' type qualifier.  We happen to use `__restrict'
  265  * as a way to define the `restrict' type qualifier without disturbing older
  266  * software that is unaware of C99 keywords.
  267  */
  268 #if !__GNUC_PREREQ__(2, 95)
  269 #if __STDC_VERSION__ < 199901
  270 #define __restrict
  271 #else
  272 #define __restrict      restrict
  273 #endif
  274 #endif
  275 
  276 /*
  277  * Compiler-dependent macros to declare that functions take printf-like
  278  * or scanf-like arguments.  They are null except for versions of gcc
  279  * that are known to support the features properly (old versions of gcc-2
  280  * didn't permit keeping the keywords out of the application namespace).
  281  *
  282  * The printf0like macro for GCC 2 uses DragonFly specific compiler extensions.
  283  */
  284 #if !__GNUC_PREREQ__(2, 7)
  285 #define __printflike(fmtarg, firstvararg)
  286 #define __scanflike(fmtarg, firstvararg)
  287 #define __printf0like(fmtarg, firstvararg)
  288 #define __format_arg(fmtarg)
  289 #define __strfmonlike(fmtarg, firstvararg)
  290 #define __strftimelike(fmtarg, firstvararg)
  291 
  292 #elif __GNUC_PREREQ__(3, 0)
  293 #define __printflike(fmtarg, firstvararg) \
  294             __attribute__((__nonnull__(fmtarg), \
  295                           __format__ (__printf__, fmtarg, firstvararg)))
  296 #define __printf0like(fmtarg, firstvararg) \
  297             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  298 #define __scanflike(fmtarg, firstvararg) \
  299             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  300 #define __format_arg(fmtarg) \
  301             __attribute__((__format_arg__ (fmtarg)))
  302 #define __strfmonlike(fmtarg, firstvararg) \
  303             __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
  304 #define __strftimelike(fmtarg, firstvararg) \
  305             __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
  306 
  307 #else
  308 #define __printflike(fmtarg, firstvararg) \
  309             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  310 #define __printf0like(fmtarg, firstvararg) \
  311             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  312 #define __scanflike(fmtarg, firstvararg) \
  313             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  314 #define __format_arg(fmtarg) \
  315             __attribute__((__format_arg__ (fmtarg)))
  316 #define __strfmonlike(fmtarg, firstvararg) \
  317             __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
  318 #define __strftimelike(fmtarg, firstvararg) \
  319             __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
  320 
  321 #endif
  322 
  323 #if !__GNUC_PREREQ__(3, 0)
  324 #define __ARRAY_ZERO    0
  325 #else
  326 #define __ARRAY_ZERO
  327 #endif
  328 
  329 #if __GNUC_PREREQ__(4, 0)
  330 #define __dso_public    __attribute__((__visibility__("default")))
  331 #define __dso_hidden    __attribute__((__visibility__("hidden")))
  332 #else
  333 #define __dso_public
  334 #define __dso_hidden
  335 #endif
  336 
  337 /*
  338  * A convenient constructor macro, GCC 4.3.0 added priority support to
  339  * constructors, provide a compatible interface for both.
  340  */
  341 #if __GNUC_PREREQ__(4, 3)
  342 #define __constructor(prio) __attribute__((constructor(prio)))
  343 #else
  344 #define __constructor(prio) __attribute__((constructor))
  345 #endif
  346 
  347 /*
  348  * Handy GCC based macros:
  349  *
  350  *      __cachealign:
  351  *      
  352  *      The __cachealign macro can be used for cache line aligning structures
  353  *      of small to medium size.  It aligns the particular structure or
  354  *      storage type to a system default cache line alignment, thus giving us
  355  *      a much more better cache utilization by making the hardware work at
  356  *      its best burst speeds.
  357  *
  358  *      __usereg:
  359  *      
  360  *      The __usereg macro can/should be used when a function contains
  361  *      arguments not more than 3.  It can be very useful to us due to the
  362  *      message-passing nature of the kernel.
  363  *
  364  * !!NOTE - USAGE INFORMATION!!
  365  *
  366  * The __cachealign macro should not be used for data structures that are
  367  * as big struct proc, struct vnode, struct thread, and other structs which
  368  * are as big as them; simply because it will be useless in that case.
  369  *
  370  * The __usereg macro should be used whenever possible, i.e., when a function
  371  * does not exceed more than 3 arguments, and should not be used for vararg
  372  * type functions.
  373  *
  374  * In other words, AVOID MISUSE OF THESE MACROS. :-)
  375  */
  376 #ifdef __GNUC__
  377 #define __cachealign    __attribute__((__aligned__(__VM_CACHELINE_SIZE)))
  378 #define __usereg        __attribute__((__regparm__(3)))
  379 #else
  380 #define __cachealign
  381 #define __usereg
  382 #endif
  383 
  384 #ifdef __GNUC__
  385 #define __strong_reference(sym,aliassym)        \
  386         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)));
  387 #define __weak_reference(sym,alias)     \
  388         __asm__(".weak " #alias);       \
  389         __asm__(".equ "  #alias ", " #sym)
  390 #define __warn_references(sym,msg)      \
  391         __asm__(".section .gnu.warning." #sym); \
  392         __asm__(".asciz \"" msg "\"");  \
  393         __asm__(".previous")
  394 #endif  /* __GNUC__ */
  395 
  396 #if defined(__GNUC__)
  397 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
  398 #endif
  399 
  400 #ifndef __RCSID
  401 #define __RCSID(s)      __IDSTRING(rcsid,s)
  402 #endif
  403 
  404 #ifndef __RCSID_SOURCE
  405 #define __RCSID_SOURCE(s) __IDSTRING(rcsid_source,s)
  406 #endif
  407 
  408 #ifndef __COPYRIGHT
  409 #define __COPYRIGHT(s)  __IDSTRING(copyright,s)
  410 #endif
  411 
  412 #ifndef __DECONST
  413 #define __DECONST(type, var)    ((type)(uintptr_t)(const void *)(var))
  414 #endif
  415 
  416 #ifndef __DEVOLATILE
  417 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
  418 #endif
  419 
  420 #ifndef __DEQUALIFY
  421 #define __DEQUALIFY(type, var)  ((type)(uintptr_t)(const volatile void *)(var))
  422 #endif
  423 
  424 /*
  425  * Keywords added in C11.
  426  */
  427 
  428 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
  429 
  430 #define _Noreturn               __dead2
  431 
  432 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
  433 
  434 #if !__has_extension(c_static_assert)
  435 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
  436     __has_extension(cxx_static_assert)
  437 #define _Static_assert(x, y)    static_assert(x, y)
  438 #elif !__GNUC_PREREQ__(4, 6)
  439 #define _Static_assert(x, y)    struct __hack
  440 #endif
  441 #endif
  442 
  443 /*
  444  * Emulation of C11 _Generic().  Unlike the previously defined C11
  445  * keywords, it is not possible to implement this using exactly the same
  446  * syntax.  Therefore implement something similar under the name
  447  * __generic().  Unlike _Generic(), this macro can only distinguish
  448  * between a single type, so it requires nested invocations to
  449  * distinguish multiple cases.
  450  */
  451 
  452 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
  453 #define __generic(expr, t, yes, no)                                     \
  454         _Generic(expr, t: yes, default: no)
  455 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
  456 #define __generic(expr, t, yes, no)                                     \
  457         __builtin_choose_expr(                                          \
  458             __builtin_types_compatible_p(__typeof(expr), t), yes, no)
  459 #endif
  460 
  461 /*-
  462  * The following definitions are an extension of the behavior originally
  463  * implemented in <sys/_posix.h>, but with a different level of granularity.
  464  * POSIX.1 requires that the macros we test be defined before any standard
  465  * header file is included.
  466  *
  467  * Here's a quick run-down of the versions:
  468  *  defined(_POSIX_SOURCE)              1003.1-1988
  469  *  _POSIX_C_SOURCE == 1                1003.1-1990
  470  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
  471  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
  472  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
  473  *                                      and the omnibus ISO/IEC 9945-1: 1996
  474  *  _POSIX_C_SOURCE == 200112           1003.1-2001
  475  *  _POSIX_C_SOURCE == 200809           1003.1-2008
  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 /*
  485  * If no special macro was specified, make the DragonFly extensions
  486  * available. Also make them available when requested so.
  487  */
  488 #if (!defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE) && \
  489     !defined(_ANSI_SOURCE) && !defined(_C99_SOURCE)) || \
  490     defined(_DRAGONFLY_SOURCE) || defined(_NETBSD_SOURCE)
  491 #define __DF_VISIBLE    1
  492 #else
  493 #define __DF_VISIBLE    0
  494 #endif
  495 
  496 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  497 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 1
  498 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
  499 #define _POSIX_C_SOURCE         199009
  500 #endif
  501 
  502 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  503 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 2
  504 #undef _POSIX_C_SOURCE
  505 #define _POSIX_C_SOURCE         199209
  506 #endif
  507 
  508 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  509 #ifdef _XOPEN_SOURCE
  510 #if _XOPEN_SOURCE - 0 >= 700
  511 #define __XSI_VISIBLE           700
  512 #undef _POSIX_C_SOURCE
  513 #define _POSIX_C_SOURCE         200809
  514 #elif _XOPEN_SOURCE - 0 >= 600
  515 #define __XSI_VISIBLE           600
  516 #undef _POSIX_C_SOURCE
  517 #define _POSIX_C_SOURCE         200112
  518 #elif _XOPEN_SOURCE - 0 >= 500
  519 #define __XSI_VISIBLE           500
  520 #undef _POSIX_C_SOURCE
  521 #define _POSIX_C_SOURCE         199506
  522 #endif
  523 #endif
  524 
  525 /*
  526  * Deal with all versions of POSIX.  The ordering relative to the tests above is
  527  * important.
  528  */
  529 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  530 #define _POSIX_C_SOURCE         198808
  531 #endif
  532 #ifdef _POSIX_C_SOURCE
  533 #if (_POSIX_C_SOURCE - 0) >= 200809
  534 #define __POSIX_VISIBLE         200809
  535 #define __ISO_C_VISIBLE         1999
  536 #elif (_POSIX_C_SOURCE - 0) >= 200112
  537 #define __POSIX_VISIBLE         200112
  538 #define __ISO_C_VISIBLE         1999
  539 #elif (_POSIX_C_SOURCE - 0) >= 199506
  540 #define __POSIX_VISIBLE         199506
  541 #define __ISO_C_VISIBLE         1990
  542 #elif (_POSIX_C_SOURCE - 0) >= 199309
  543 #define __POSIX_VISIBLE         199309
  544 #define __ISO_C_VISIBLE         1990
  545 #elif (_POSIX_C_SOURCE - 0) >= 199209
  546 #define __POSIX_VISIBLE         199209
  547 #define __ISO_C_VISIBLE         1990
  548 #elif (_POSIX_C_SOURCE - 0) >= 199009
  549 #define __POSIX_VISIBLE         199009
  550 #define __ISO_C_VISIBLE         1990
  551 #else
  552 #define __POSIX_VISIBLE         198808
  553 #define __ISO_C_VISIBLE         0
  554 #endif /* _POSIX_C_SOURCE */
  555 #else
  556 /*-
  557  * Deal with _ANSI_SOURCE:
  558  * If it is defined, and no other compilation environment is explicitly
  559  * requested, then define our internal feature-test macros to zero.  This
  560  * makes no difference to the preprocessor (undefined symbols in preprocessing
  561  * expressions are defined to have value zero), but makes it more convenient for
  562  * a test program to print out the values.
  563  *
  564  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
  565  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
  566  * environment (and in fact we will never get here).
  567  */
  568 #ifdef _ANSI_SOURCE             /* Hide almost everything. */
  569 #define __POSIX_VISIBLE         0
  570 #define __XSI_VISIBLE           0
  571 #define __BSD_VISIBLE           0
  572 #define __ISO_C_VISIBLE         1990
  573 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
  574 #define __POSIX_VISIBLE         0
  575 #define __XSI_VISIBLE           0
  576 #define __BSD_VISIBLE           0
  577 #define __ISO_C_VISIBLE         1999
  578 #elif defined(_C11_SOURCE)      /* Localism to specify strict C11 env. */
  579 #define __POSIX_VISIBLE         0
  580 #define __XSI_VISIBLE           0
  581 #define __BSD_VISIBLE           0
  582 #define __ISO_C_VISIBLE         2011
  583 #else                           /* Default environment: show everything. */
  584 #define __POSIX_VISIBLE         200809
  585 #define __XSI_VISIBLE           700
  586 #define __BSD_VISIBLE           1
  587 #define __ISO_C_VISIBLE         2011
  588 #endif
  589 #endif
  590 
  591 /*
  592  * GLOBL macro exists to preserve __start_set_* and __stop_set_* sections
  593  * of kernel modules which are discarded from binutils 2.17.50+ otherwise.
  594  */
  595 
  596 #define __GLOBL1(sym)   __asm__(".globl " #sym)
  597 #define __GLOBL(sym)    __GLOBL1(sym)
  598 
  599 #endif /* !_SYS_CDEFS_H_ */

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