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/9.2/sys/sys/cdefs.h 242893 2012-11-11 12:21:51Z ed $
   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, 95)
  222 #define __alignof(x)    __offsetof(struct { char __a; x __b; }, __b)
  223 #endif
  224 
  225 /*
  226  * Keywords added in C11.
  227  */
  228 #if defined(__cplusplus) && __cplusplus >= 201103L
  229 #define _Alignas(e)             alignas(e)
  230 #define _Alignof(e)             alignof(e)
  231 #define _Noreturn               [[noreturn]]
  232 #define _Static_assert(e, s)    static_assert(e, s)
  233 /* FIXME: change this to thread_local when clang in base supports it */
  234 #define _Thread_local           __thread
  235 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
  236 /* Do nothing.  They are language keywords. */
  237 #else
  238 /* Not supported.  Implement them using our versions. */
  239 #define _Alignas(x)             __aligned(x)
  240 #define _Alignof(x)             __alignof(x)
  241 #define _Noreturn               __dead2
  242 #define _Thread_local           __thread
  243 #ifdef __COUNTER__
  244 #define _Static_assert(x, y)    __Static_assert(x, __COUNTER__)
  245 #define __Static_assert(x, y)   ___Static_assert(x, y)
  246 #define ___Static_assert(x, y)  typedef char __assert_ ## y[(x) ? 1 : -1]
  247 #else
  248 #define _Static_assert(x, y)    struct __hack
  249 #endif
  250 #endif
  251 
  252 /*
  253  * Emulation of C11 _Generic().  Unlike the previously defined C11
  254  * keywords, it is not possible to implement this using exactly the same
  255  * syntax.  Therefore implement something similar under the name
  256  * __generic().  Unlike _Generic(), this macro can only distinguish
  257  * between a single type, so it requires nested invocations to
  258  * distinguish multiple cases.
  259  */
  260 
  261 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
  262 #define __generic(expr, t, yes, no)                                     \
  263         _Generic(expr, t: yes, default: no)
  264 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
  265 #define __generic(expr, t, yes, no)                                     \
  266         __builtin_choose_expr(                                          \
  267             __builtin_types_compatible_p(__typeof(expr), t), yes, no)
  268 #endif
  269 
  270 #if __GNUC_PREREQ__(2, 96)
  271 #define __malloc_like   __attribute__((__malloc__))
  272 #define __pure          __attribute__((__pure__))
  273 #else
  274 #define __malloc_like
  275 #define __pure
  276 #endif
  277 
  278 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
  279 #define __always_inline __attribute__((__always_inline__))
  280 #else
  281 #define __always_inline
  282 #endif
  283 
  284 #if __GNUC_PREREQ__(3, 1)
  285 #define __noinline      __attribute__ ((__noinline__))
  286 #else
  287 #define __noinline
  288 #endif
  289 
  290 #if __GNUC_PREREQ__(3, 3)
  291 #define __nonnull(x)    __attribute__((__nonnull__(x)))
  292 #else
  293 #define __nonnull(x)
  294 #endif
  295 
  296 #if __GNUC_PREREQ__(3, 4)
  297 #define __fastcall      __attribute__((__fastcall__))
  298 #else
  299 #define __fastcall
  300 #endif
  301 
  302 #if __GNUC_PREREQ__(4, 1)
  303 #define __returns_twice __attribute__((__returns_twice__))
  304 #else
  305 #define __returns_twice
  306 #endif
  307 
  308 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
  309 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  310 #define __func__        NULL
  311 #endif
  312 
  313 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
  314 #define __LONG_LONG_SUPPORTED
  315 #endif
  316 
  317 /* C++11 exposes a load of C99 stuff */
  318 #if defined(__cplusplus) && __cplusplus >= 201103L
  319 #define __LONG_LONG_SUPPORTED
  320 #ifndef __STDC_LIMIT_MACROS
  321 #define __STDC_LIMIT_MACROS
  322 #endif
  323 #ifndef __STDC_CONSTANT_MACROS
  324 #define __STDC_CONSTANT_MACROS
  325 #endif
  326 #endif
  327 
  328 /*
  329  * GCC 2.95 provides `__restrict' as an extension to C90 to support the
  330  * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
  331  * a way to define the `restrict' type qualifier without disturbing older
  332  * software that is unaware of C99 keywords.
  333  */
  334 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
  335 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
  336 #define __restrict
  337 #else
  338 #define __restrict      restrict
  339 #endif
  340 #endif
  341 
  342 /*
  343  * GNU C version 2.96 adds explicit branch prediction so that
  344  * the CPU back-end can hint the processor and also so that
  345  * code blocks can be reordered such that the predicted path
  346  * sees a more linear flow, thus improving cache behavior, etc.
  347  *
  348  * The following two macros provide us with a way to utilize this
  349  * compiler feature.  Use __predict_true() if you expect the expression
  350  * to evaluate to true, and __predict_false() if you expect the
  351  * expression to evaluate to false.
  352  *
  353  * A few notes about usage:
  354  *
  355  *      * Generally, __predict_false() error condition checks (unless
  356  *        you have some _strong_ reason to do otherwise, in which case
  357  *        document it), and/or __predict_true() `no-error' condition
  358  *        checks, assuming you want to optimize for the no-error case.
  359  *
  360  *      * Other than that, if you don't know the likelihood of a test
  361  *        succeeding from empirical or other `hard' evidence, don't
  362  *        make predictions.
  363  *
  364  *      * These are meant to be used in places that are run `a lot'.
  365  *        It is wasteful to make predictions in code that is run
  366  *        seldomly (e.g. at subsystem initialization time) as the
  367  *        basic block reordering that this affects can often generate
  368  *        larger code.
  369  */
  370 #if __GNUC_PREREQ__(2, 96)
  371 #define __predict_true(exp)     __builtin_expect((exp), 1)
  372 #define __predict_false(exp)    __builtin_expect((exp), 0)
  373 #else
  374 #define __predict_true(exp)     (exp)
  375 #define __predict_false(exp)    (exp)
  376 #endif
  377 
  378 #if __GNUC_PREREQ__(4, 2)
  379 #define __hidden        __attribute__((__visibility__("hidden")))
  380 #define __exported      __attribute__((__visibility__("default")))
  381 #else
  382 #define __hidden
  383 #define __exported
  384 #endif
  385 
  386 /*
  387  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  388  * require it.
  389  */
  390 #if __GNUC_PREREQ__(4, 1)
  391 #define __offsetof(type, field)  __builtin_offsetof(type, field)
  392 #else
  393 #ifndef __cplusplus
  394 #define __offsetof(type, field) \
  395         ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
  396 #else
  397 #define __offsetof(type, field)                                 \
  398   (__offsetof__ (reinterpret_cast <__size_t>                    \
  399                  (&reinterpret_cast <const volatile char &>     \
  400                   (static_cast<type *> (0)->field))))
  401 #endif
  402 #endif
  403 #define __rangeof(type, start, end) \
  404         (__offsetof(type, end) - __offsetof(type, start))
  405 
  406 /*
  407  * Given the pointer x to the member m of the struct s, return
  408  * a pointer to the containing structure.  When using GCC, we first
  409  * assign pointer x to a local variable, to check that its type is
  410  * compatible with member m.
  411  */
  412 #if __GNUC_PREREQ__(3, 1)
  413 #define __containerof(x, s, m) ({                                       \
  414         const volatile __typeof(((s *)0)->m) *__x = (x);                \
  415         __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
  416 })
  417 #else
  418 #define __containerof(x, s, m)                                          \
  419         __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
  420 #endif
  421 
  422 /*
  423  * Compiler-dependent macros to declare that functions take printf-like
  424  * or scanf-like arguments.  They are null except for versions of gcc
  425  * that are known to support the features properly (old versions of gcc-2
  426  * didn't permit keeping the keywords out of the application namespace).
  427  */
  428 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  429 #define __printflike(fmtarg, firstvararg)
  430 #define __scanflike(fmtarg, firstvararg)
  431 #define __format_arg(fmtarg)
  432 #define __strfmonlike(fmtarg, firstvararg)
  433 #define __strftimelike(fmtarg, firstvararg)
  434 #else
  435 #define __printflike(fmtarg, firstvararg) \
  436             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  437 #define __scanflike(fmtarg, firstvararg) \
  438             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  439 #define __format_arg(fmtarg)    __attribute__((__format_arg__ (fmtarg)))
  440 #define __strfmonlike(fmtarg, firstvararg) \
  441             __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
  442 #define __strftimelike(fmtarg, firstvararg) \
  443             __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
  444 #endif
  445 
  446 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  447 #if __FreeBSD_cc_version >= 300001 && defined(__GNUC__) && !defined(__INTEL_COMPILER)
  448 #define __printf0like(fmtarg, firstvararg) \
  449             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  450 #else
  451 #define __printf0like(fmtarg, firstvararg)
  452 #endif
  453 
  454 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  455 #ifndef __INTEL_COMPILER
  456 #define __strong_reference(sym,aliassym)        \
  457         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
  458 #endif
  459 #ifdef __STDC__
  460 #define __weak_reference(sym,alias)     \
  461         __asm__(".weak " #alias);       \
  462         __asm__(".equ "  #alias ", " #sym)
  463 #define __warn_references(sym,msg)      \
  464         __asm__(".section .gnu.warning." #sym); \
  465         __asm__(".asciz \"" msg "\"");  \
  466         __asm__(".previous")
  467 #define __sym_compat(sym,impl,verid)    \
  468         __asm__(".symver " #impl ", " #sym "@" #verid)
  469 #define __sym_default(sym,impl,verid)   \
  470         __asm__(".symver " #impl ", " #sym "@@" #verid)
  471 #else
  472 #define __weak_reference(sym,alias)     \
  473         __asm__(".weak alias");         \
  474         __asm__(".equ alias, sym")
  475 #define __warn_references(sym,msg)      \
  476         __asm__(".section .gnu.warning.sym"); \
  477         __asm__(".asciz \"msg\"");      \
  478         __asm__(".previous")
  479 #define __sym_compat(sym,impl,verid)    \
  480         __asm__(".symver impl, sym@verid")
  481 #define __sym_default(impl,sym,verid)   \
  482         __asm__(".symver impl, sym@@verid")
  483 #endif  /* __STDC__ */
  484 #endif  /* __GNUC__ || __INTEL_COMPILER */
  485 
  486 #define __GLOBL1(sym)   __asm__(".globl " #sym)
  487 #define __GLOBL(sym)    __GLOBL1(sym)
  488 
  489 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  490 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
  491 #else
  492 /*
  493  * The following definition might not work well if used in header files,
  494  * but it should be better than nothing.  If you want a "do nothing"
  495  * version, then it should generate some harmless declaration, such as:
  496  *    #define __IDSTRING(name,string)   struct __hack
  497  */
  498 #define __IDSTRING(name,string) static const char name[] __unused = string
  499 #endif
  500 
  501 /*
  502  * Embed the rcs id of a source file in the resulting library.  Note that in
  503  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
  504  * Usage:
  505  *      __FBSDID("$FreeBSD: releng/9.2/sys/sys/cdefs.h 242893 2012-11-11 12:21:51Z ed $");
  506  */
  507 #ifndef __FBSDID
  508 #if !defined(lint) && !defined(STRIP_FBSDID)
  509 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  510 #else
  511 #define __FBSDID(s)     struct __hack
  512 #endif
  513 #endif
  514 
  515 #ifndef __RCSID
  516 #ifndef NO__RCSID
  517 #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  518 #else
  519 #define __RCSID(s)      struct __hack
  520 #endif
  521 #endif
  522 
  523 #ifndef __RCSID_SOURCE
  524 #ifndef NO__RCSID_SOURCE
  525 #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
  526 #else
  527 #define __RCSID_SOURCE(s)       struct __hack
  528 #endif
  529 #endif
  530 
  531 #ifndef __SCCSID
  532 #ifndef NO__SCCSID
  533 #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
  534 #else
  535 #define __SCCSID(s)     struct __hack
  536 #endif
  537 #endif
  538 
  539 #ifndef __COPYRIGHT
  540 #ifndef NO__COPYRIGHT
  541 #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
  542 #else
  543 #define __COPYRIGHT(s)  struct __hack
  544 #endif
  545 #endif
  546 
  547 #ifndef __DECONST
  548 #define __DECONST(type, var)    ((type)(__uintptr_t)(const void *)(var))
  549 #endif
  550 
  551 #ifndef __DEVOLATILE
  552 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
  553 #endif
  554 
  555 #ifndef __DEQUALIFY
  556 #define __DEQUALIFY(type, var)  ((type)(__uintptr_t)(const volatile void *)(var))
  557 #endif
  558 
  559 /*-
  560  * The following definitions are an extension of the behavior originally
  561  * implemented in <sys/_posix.h>, but with a different level of granularity.
  562  * POSIX.1 requires that the macros we test be defined before any standard
  563  * header file is included.
  564  *
  565  * Here's a quick run-down of the versions:
  566  *  defined(_POSIX_SOURCE)              1003.1-1988
  567  *  _POSIX_C_SOURCE == 1                1003.1-1990
  568  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
  569  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
  570  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
  571  *                                      and the omnibus ISO/IEC 9945-1: 1996
  572  *  _POSIX_C_SOURCE == 200112           1003.1-2001
  573  *  _POSIX_C_SOURCE == 200809           1003.1-2008
  574  *
  575  * In addition, the X/Open Portability Guide, which is now the Single UNIX
  576  * Specification, defines a feature-test macro which indicates the version of
  577  * that specification, and which subsumes _POSIX_C_SOURCE.
  578  *
  579  * Our macros begin with two underscores to avoid namespace screwage.
  580  */
  581 
  582 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  583 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
  584 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
  585 #define _POSIX_C_SOURCE         199009
  586 #endif
  587 
  588 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  589 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
  590 #undef _POSIX_C_SOURCE
  591 #define _POSIX_C_SOURCE         199209
  592 #endif
  593 
  594 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  595 #ifdef _XOPEN_SOURCE
  596 #if _XOPEN_SOURCE - 0 >= 700
  597 #define __XSI_VISIBLE           700
  598 #undef _POSIX_C_SOURCE
  599 #define _POSIX_C_SOURCE         200809
  600 #elif _XOPEN_SOURCE - 0 >= 600
  601 #define __XSI_VISIBLE           600
  602 #undef _POSIX_C_SOURCE
  603 #define _POSIX_C_SOURCE         200112
  604 #elif _XOPEN_SOURCE - 0 >= 500
  605 #define __XSI_VISIBLE           500
  606 #undef _POSIX_C_SOURCE
  607 #define _POSIX_C_SOURCE         199506
  608 #endif
  609 #endif
  610 
  611 /*
  612  * Deal with all versions of POSIX.  The ordering relative to the tests above is
  613  * important.
  614  */
  615 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  616 #define _POSIX_C_SOURCE         198808
  617 #endif
  618 #ifdef _POSIX_C_SOURCE
  619 #if _POSIX_C_SOURCE >= 200809
  620 #define __POSIX_VISIBLE         200809
  621 #define __ISO_C_VISIBLE         1999
  622 #elif _POSIX_C_SOURCE >= 200112
  623 #define __POSIX_VISIBLE         200112
  624 #define __ISO_C_VISIBLE         1999
  625 #elif _POSIX_C_SOURCE >= 199506
  626 #define __POSIX_VISIBLE         199506
  627 #define __ISO_C_VISIBLE         1990
  628 #elif _POSIX_C_SOURCE >= 199309
  629 #define __POSIX_VISIBLE         199309
  630 #define __ISO_C_VISIBLE         1990
  631 #elif _POSIX_C_SOURCE >= 199209
  632 #define __POSIX_VISIBLE         199209
  633 #define __ISO_C_VISIBLE         1990
  634 #elif _POSIX_C_SOURCE >= 199009
  635 #define __POSIX_VISIBLE         199009
  636 #define __ISO_C_VISIBLE         1990
  637 #else
  638 #define __POSIX_VISIBLE         198808
  639 #define __ISO_C_VISIBLE         0
  640 #endif /* _POSIX_C_SOURCE */
  641 #else
  642 /*-
  643  * Deal with _ANSI_SOURCE:
  644  * If it is defined, and no other compilation environment is explicitly
  645  * requested, then define our internal feature-test macros to zero.  This
  646  * makes no difference to the preprocessor (undefined symbols in preprocessing
  647  * expressions are defined to have value zero), but makes it more convenient for
  648  * a test program to print out the values.
  649  *
  650  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
  651  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
  652  * environment (and in fact we will never get here).
  653  */
  654 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
  655 #define __POSIX_VISIBLE         0
  656 #define __XSI_VISIBLE           0
  657 #define __BSD_VISIBLE           0
  658 #define __ISO_C_VISIBLE         1990
  659 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
  660 #define __POSIX_VISIBLE         0
  661 #define __XSI_VISIBLE           0
  662 #define __BSD_VISIBLE           0
  663 #define __ISO_C_VISIBLE         1999
  664 #else                           /* Default environment: show everything. */
  665 #define __POSIX_VISIBLE         200809
  666 #define __XSI_VISIBLE           700
  667 #define __BSD_VISIBLE           1
  668 #define __ISO_C_VISIBLE         1999
  669 #endif
  670 #endif
  671 
  672 #ifndef __has_feature
  673 #define __has_feature(x) 0
  674 #endif
  675 #ifndef __has_include
  676 #define __has_include(x) 0
  677 #endif
  678 #ifndef __has_builtin
  679 #define __has_builtin(x) 0
  680 #endif
  681 
  682 #if defined(__mips) || defined(__powerpc64__) || defined(__arm__)
  683 #define __NO_TLS 1
  684 #endif
  685 
  686 #endif /* !_SYS_CDEFS_H_ */

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