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: stable/9/sys/sys/cdefs.h 284947 2015-06-30 08:39:34Z tijl $
   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)
   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 /*
   86  * Compiler memory barriers, specific to gcc and clang.
   87  */
   88 #if defined(__GNUC__)
   89 #define __compiler_membar()     __asm __volatile(" " : : : "memory")
   90 #endif
   91 
   92 #ifndef __INTEL_COMPILER
   93 # define __GNUCLIKE_BUILTIN_NEXT_ARG 1
   94 # define __GNUCLIKE_MATH_BUILTIN_RELOPS
   95 #endif
   96 
   97 #define __GNUCLIKE_BUILTIN_MEMCPY 1
   98 
   99 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
  100 #define __CC_SUPPORTS_INLINE 1
  101 #define __CC_SUPPORTS___INLINE 1
  102 #define __CC_SUPPORTS___INLINE__ 1
  103 
  104 #define __CC_SUPPORTS___FUNC__ 1
  105 #define __CC_SUPPORTS_WARNING 1
  106 
  107 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
  108 
  109 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
  110 
  111 #endif /* __GNUC__ || __INTEL_COMPILER */
  112 
  113 /*
  114  * Macro to test if we're using a specific version of gcc or later.
  115  */
  116 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
  117 #define __GNUC_PREREQ__(ma, mi) \
  118         (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
  119 #else
  120 #define __GNUC_PREREQ__(ma, mi) 0
  121 #endif
  122 
  123 /*
  124  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
  125  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
  126  * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
  127  * mode -- there must be no spaces between its arguments, and for nested
  128  * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
  129  * concatenate double-quoted strings produced by the __STRING macro, but
  130  * this only works with ANSI C.
  131  *
  132  * __XSTRING is like __STRING, but it expands any macros in its argument
  133  * first.  It is only available with ANSI C.
  134  */
  135 #if defined(__STDC__) || defined(__cplusplus)
  136 #define __P(protos)     protos          /* full-blown ANSI C */
  137 #define __CONCAT1(x,y)  x ## y
  138 #define __CONCAT(x,y)   __CONCAT1(x,y)
  139 #define __STRING(x)     #x              /* stringify without expanding x */
  140 #define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */
  141 
  142 #define __const         const           /* define reserved names to standard */
  143 #define __signed        signed
  144 #define __volatile      volatile
  145 #if defined(__cplusplus)
  146 #define __inline        inline          /* convert to C++ keyword */
  147 #else
  148 #if !(defined(__CC_SUPPORTS___INLINE))
  149 #define __inline                        /* delete GCC keyword */
  150 #endif /* ! __CC_SUPPORTS___INLINE */
  151 #endif /* !__cplusplus */
  152 
  153 #else   /* !(__STDC__ || __cplusplus) */
  154 #define __P(protos)     ()              /* traditional C preprocessor */
  155 #define __CONCAT(x,y)   x/**/y
  156 #define __STRING(x)     "x"
  157 
  158 #if !defined(__CC_SUPPORTS___INLINE)
  159 #define __const                         /* delete pseudo-ANSI C keywords */
  160 #define __inline
  161 #define __signed
  162 #define __volatile
  163 /*
  164  * In non-ANSI C environments, new programs will want ANSI-only C keywords
  165  * deleted from the program and old programs will want them left alone.
  166  * When using a compiler other than gcc, programs using the ANSI C keywords
  167  * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
  168  * When using "gcc -traditional", we assume that this is the intent; if
  169  * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
  170  */
  171 #ifndef NO_ANSI_KEYWORDS
  172 #define const                           /* delete ANSI C keywords */
  173 #define inline
  174 #define signed
  175 #define volatile
  176 #endif  /* !NO_ANSI_KEYWORDS */
  177 #endif  /* !__CC_SUPPORTS___INLINE */
  178 #endif  /* !(__STDC__ || __cplusplus) */
  179 
  180 /*
  181  * Compiler-dependent macros to help declare dead (non-returning) and
  182  * pure (no side effects) functions, and unused variables.  They are
  183  * null except for versions of gcc that are known to support the features
  184  * properly (old versions of gcc-2 supported the dead and pure features
  185  * in a different (wrong) way).  If we do not provide an implementation
  186  * for a given compiler, let the compile fail if it is told to use
  187  * a feature that we cannot live without.
  188  */
  189 #ifdef lint
  190 #define __dead2
  191 #define __pure2
  192 #define __unused
  193 #define __packed
  194 #define __aligned(x)
  195 #define __section(x)
  196 #else
  197 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
  198 #define __dead2
  199 #define __pure2
  200 #define __unused
  201 #endif
  202 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
  203 #define __dead2         __attribute__((__noreturn__))
  204 #define __pure2         __attribute__((__const__))
  205 #define __unused
  206 /* XXX Find out what to do for __packed, __aligned and __section */
  207 #endif
  208 #if __GNUC_PREREQ__(2, 7)
  209 #define __dead2         __attribute__((__noreturn__))
  210 #define __pure2         __attribute__((__const__))
  211 #define __unused        __attribute__((__unused__))
  212 #define __used          __attribute__((__used__))
  213 #define __packed        __attribute__((__packed__))
  214 #define __aligned(x)    __attribute__((__aligned__(x)))
  215 #define __section(x)    __attribute__((__section__(x)))
  216 #endif
  217 #if defined(__INTEL_COMPILER)
  218 #define __dead2         __attribute__((__noreturn__))
  219 #define __pure2         __attribute__((__const__))
  220 #define __unused        __attribute__((__unused__))
  221 #define __used          __attribute__((__used__))
  222 #define __packed        __attribute__((__packed__))
  223 #define __aligned(x)    __attribute__((__aligned__(x)))
  224 #define __section(x)    __attribute__((__section__(x)))
  225 #endif
  226 #endif
  227 
  228 #if !__GNUC_PREREQ__(2, 95)
  229 #define __alignof(x)    __offsetof(struct { char __a; x __b; }, __b)
  230 #endif
  231 
  232 /*
  233  * Keywords added in C11.
  234  */
  235 #if defined(__cplusplus) && __cplusplus >= 201103L
  236 #define _Alignas(e)             alignas(e)
  237 #define _Alignof(e)             alignof(e)
  238 #define _Noreturn               [[noreturn]]
  239 #define _Static_assert(e, s)    static_assert(e, s)
  240 /* FIXME: change this to thread_local when clang in base supports it */
  241 #define _Thread_local           __thread
  242 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L && !defined(lint)
  243 /* Do nothing.  They are language keywords. */
  244 #else
  245 /* Not supported.  Implement them using our versions. */
  246 #define _Alignas(x)             __aligned(x)
  247 #define _Alignof(x)             __alignof(x)
  248 #define _Noreturn               __dead2
  249 #define _Thread_local           __thread
  250 #ifdef __COUNTER__
  251 #define _Static_assert(x, y)    __Static_assert(x, __COUNTER__)
  252 #define __Static_assert(x, y)   ___Static_assert(x, y)
  253 #define ___Static_assert(x, y)  typedef char __assert_ ## y[(x) ? 1 : -1] \
  254                                 __unused
  255 #else
  256 #define _Static_assert(x, y)    struct __hack
  257 #endif
  258 #endif
  259 
  260 /*
  261  * Emulation of C11 _Generic().  Unlike the previously defined C11
  262  * keywords, it is not possible to implement this using exactly the same
  263  * syntax.  Therefore implement something similar under the name
  264  * __generic().  Unlike _Generic(), this macro can only distinguish
  265  * between a single type, so it requires nested invocations to
  266  * distinguish multiple cases.
  267  */
  268 
  269 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
  270 #define __generic(expr, t, yes, no)                                     \
  271         _Generic(expr, t: yes, default: no)
  272 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
  273 #define __generic(expr, t, yes, no)                                     \
  274         __builtin_choose_expr(                                          \
  275             __builtin_types_compatible_p(__typeof(expr), t), yes, no)
  276 #endif
  277 
  278 #if __GNUC_PREREQ__(2, 96)
  279 #define __malloc_like   __attribute__((__malloc__))
  280 #define __pure          __attribute__((__pure__))
  281 #else
  282 #define __malloc_like
  283 #define __pure
  284 #endif
  285 
  286 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
  287 #define __always_inline __attribute__((__always_inline__))
  288 #else
  289 #define __always_inline
  290 #endif
  291 
  292 #if __GNUC_PREREQ__(3, 1)
  293 #define __noinline      __attribute__ ((__noinline__))
  294 #else
  295 #define __noinline
  296 #endif
  297 
  298 #if __GNUC_PREREQ__(3, 3)
  299 #define __nonnull(x)    __attribute__((__nonnull__(x)))
  300 #else
  301 #define __nonnull(x)
  302 #endif
  303 
  304 #if __GNUC_PREREQ__(3, 4)
  305 #define __fastcall      __attribute__((__fastcall__))
  306 #else
  307 #define __fastcall
  308 #endif
  309 
  310 #if __GNUC_PREREQ__(4, 1)
  311 #define __returns_twice __attribute__((__returns_twice__))
  312 #else
  313 #define __returns_twice
  314 #endif
  315 
  316 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
  317 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  318 #define __func__        NULL
  319 #endif
  320 
  321 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
  322 #define __LONG_LONG_SUPPORTED
  323 #endif
  324 
  325 /* C++11 exposes a load of C99 stuff */
  326 #if defined(__cplusplus) && __cplusplus >= 201103L
  327 #define __LONG_LONG_SUPPORTED
  328 #ifndef __STDC_LIMIT_MACROS
  329 #define __STDC_LIMIT_MACROS
  330 #endif
  331 #ifndef __STDC_CONSTANT_MACROS
  332 #define __STDC_CONSTANT_MACROS
  333 #endif
  334 #endif
  335 
  336 /*
  337  * GCC 2.95 provides `__restrict' as an extension to C90 to support the
  338  * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
  339  * a way to define the `restrict' type qualifier without disturbing older
  340  * software that is unaware of C99 keywords.
  341  */
  342 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
  343 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
  344 #define __restrict
  345 #else
  346 #define __restrict      restrict
  347 #endif
  348 #endif
  349 
  350 /*
  351  * GNU C version 2.96 adds explicit branch prediction so that
  352  * the CPU back-end can hint the processor and also so that
  353  * code blocks can be reordered such that the predicted path
  354  * sees a more linear flow, thus improving cache behavior, etc.
  355  *
  356  * The following two macros provide us with a way to utilize this
  357  * compiler feature.  Use __predict_true() if you expect the expression
  358  * to evaluate to true, and __predict_false() if you expect the
  359  * expression to evaluate to false.
  360  *
  361  * A few notes about usage:
  362  *
  363  *      * Generally, __predict_false() error condition checks (unless
  364  *        you have some _strong_ reason to do otherwise, in which case
  365  *        document it), and/or __predict_true() `no-error' condition
  366  *        checks, assuming you want to optimize for the no-error case.
  367  *
  368  *      * Other than that, if you don't know the likelihood of a test
  369  *        succeeding from empirical or other `hard' evidence, don't
  370  *        make predictions.
  371  *
  372  *      * These are meant to be used in places that are run `a lot'.
  373  *        It is wasteful to make predictions in code that is run
  374  *        seldomly (e.g. at subsystem initialization time) as the
  375  *        basic block reordering that this affects can often generate
  376  *        larger code.
  377  */
  378 #if __GNUC_PREREQ__(2, 96)
  379 #define __predict_true(exp)     __builtin_expect((exp), 1)
  380 #define __predict_false(exp)    __builtin_expect((exp), 0)
  381 #else
  382 #define __predict_true(exp)     (exp)
  383 #define __predict_false(exp)    (exp)
  384 #endif
  385 
  386 #if __GNUC_PREREQ__(4, 2)
  387 #define __hidden        __attribute__((__visibility__("hidden")))
  388 #define __exported      __attribute__((__visibility__("default")))
  389 #else
  390 #define __hidden
  391 #define __exported
  392 #endif
  393 
  394 /*
  395  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  396  * require it.
  397  */
  398 #if __GNUC_PREREQ__(4, 1)
  399 #define __offsetof(type, field)  __builtin_offsetof(type, field)
  400 #else
  401 #ifndef __cplusplus
  402 #define __offsetof(type, field) \
  403         ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
  404 #else
  405 #define __offsetof(type, field)                                 \
  406   (__offsetof__ (reinterpret_cast <__size_t>                    \
  407                  (&reinterpret_cast <const volatile char &>     \
  408                   (static_cast<type *> (0)->field))))
  409 #endif
  410 #endif
  411 #define __rangeof(type, start, end) \
  412         (__offsetof(type, end) - __offsetof(type, start))
  413 
  414 /*
  415  * Given the pointer x to the member m of the struct s, return
  416  * a pointer to the containing structure.  When using GCC, we first
  417  * assign pointer x to a local variable, to check that its type is
  418  * compatible with member m.
  419  */
  420 #if __GNUC_PREREQ__(3, 1)
  421 #define __containerof(x, s, m) ({                                       \
  422         const volatile __typeof(((s *)0)->m) *__x = (x);                \
  423         __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
  424 })
  425 #else
  426 #define __containerof(x, s, m)                                          \
  427         __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
  428 #endif
  429 
  430 /*
  431  * Compiler-dependent macros to declare that functions take printf-like
  432  * or scanf-like arguments.  They are null except for versions of gcc
  433  * that are known to support the features properly (old versions of gcc-2
  434  * didn't permit keeping the keywords out of the application namespace).
  435  */
  436 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  437 #define __printflike(fmtarg, firstvararg)
  438 #define __scanflike(fmtarg, firstvararg)
  439 #define __format_arg(fmtarg)
  440 #define __strfmonlike(fmtarg, firstvararg)
  441 #define __strftimelike(fmtarg, firstvararg)
  442 #else
  443 #define __printflike(fmtarg, firstvararg) \
  444             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  445 #define __scanflike(fmtarg, firstvararg) \
  446             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  447 #define __format_arg(fmtarg)    __attribute__((__format_arg__ (fmtarg)))
  448 #define __strfmonlike(fmtarg, firstvararg) \
  449             __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
  450 #define __strftimelike(fmtarg, firstvararg) \
  451             __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
  452 #endif
  453 
  454 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  455 #if __FreeBSD_cc_version >= 300001 && defined(__GNUC__) && !defined(__INTEL_COMPILER)
  456 #define __printf0like(fmtarg, firstvararg) \
  457             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  458 #else
  459 #define __printf0like(fmtarg, firstvararg)
  460 #endif
  461 
  462 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  463 #ifndef __INTEL_COMPILER
  464 #define __strong_reference(sym,aliassym)        \
  465         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
  466 #endif
  467 #ifdef __STDC__
  468 #define __weak_reference(sym,alias)     \
  469         __asm__(".weak " #alias);       \
  470         __asm__(".equ "  #alias ", " #sym)
  471 #define __warn_references(sym,msg)      \
  472         __asm__(".section .gnu.warning." #sym); \
  473         __asm__(".asciz \"" msg "\"");  \
  474         __asm__(".previous")
  475 #define __sym_compat(sym,impl,verid)    \
  476         __asm__(".symver " #impl ", " #sym "@" #verid)
  477 #define __sym_default(sym,impl,verid)   \
  478         __asm__(".symver " #impl ", " #sym "@@" #verid)
  479 #else
  480 #define __weak_reference(sym,alias)     \
  481         __asm__(".weak alias");         \
  482         __asm__(".equ alias, sym")
  483 #define __warn_references(sym,msg)      \
  484         __asm__(".section .gnu.warning.sym"); \
  485         __asm__(".asciz \"msg\"");      \
  486         __asm__(".previous")
  487 #define __sym_compat(sym,impl,verid)    \
  488         __asm__(".symver impl, sym@verid")
  489 #define __sym_default(impl,sym,verid)   \
  490         __asm__(".symver impl, sym@@verid")
  491 #endif  /* __STDC__ */
  492 #endif  /* __GNUC__ || __INTEL_COMPILER */
  493 
  494 #define __GLOBL1(sym)   __asm__(".globl " #sym)
  495 #define __GLOBL(sym)    __GLOBL1(sym)
  496 
  497 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  498 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
  499 #else
  500 /*
  501  * The following definition might not work well if used in header files,
  502  * but it should be better than nothing.  If you want a "do nothing"
  503  * version, then it should generate some harmless declaration, such as:
  504  *    #define __IDSTRING(name,string)   struct __hack
  505  */
  506 #define __IDSTRING(name,string) static const char name[] __unused = string
  507 #endif
  508 
  509 /*
  510  * Embed the rcs id of a source file in the resulting library.  Note that in
  511  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
  512  * Usage:
  513  *      __FBSDID("$FreeBSD: stable/9/sys/sys/cdefs.h 284947 2015-06-30 08:39:34Z tijl $");
  514  */
  515 #ifndef __FBSDID
  516 #if !defined(lint) && !defined(STRIP_FBSDID)
  517 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  518 #else
  519 #define __FBSDID(s)     struct __hack
  520 #endif
  521 #endif
  522 
  523 #ifndef __RCSID
  524 #ifndef NO__RCSID
  525 #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  526 #else
  527 #define __RCSID(s)      struct __hack
  528 #endif
  529 #endif
  530 
  531 #ifndef __RCSID_SOURCE
  532 #ifndef NO__RCSID_SOURCE
  533 #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
  534 #else
  535 #define __RCSID_SOURCE(s)       struct __hack
  536 #endif
  537 #endif
  538 
  539 #ifndef __SCCSID
  540 #ifndef NO__SCCSID
  541 #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
  542 #else
  543 #define __SCCSID(s)     struct __hack
  544 #endif
  545 #endif
  546 
  547 #ifndef __COPYRIGHT
  548 #ifndef NO__COPYRIGHT
  549 #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
  550 #else
  551 #define __COPYRIGHT(s)  struct __hack
  552 #endif
  553 #endif
  554 
  555 #ifndef __DECONST
  556 #define __DECONST(type, var)    ((type)(__uintptr_t)(const void *)(var))
  557 #endif
  558 
  559 #ifndef __DEVOLATILE
  560 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
  561 #endif
  562 
  563 #ifndef __DEQUALIFY
  564 #define __DEQUALIFY(type, var)  ((type)(__uintptr_t)(const volatile void *)(var))
  565 #endif
  566 
  567 /*-
  568  * The following definitions are an extension of the behavior originally
  569  * implemented in <sys/_posix.h>, but with a different level of granularity.
  570  * POSIX.1 requires that the macros we test be defined before any standard
  571  * header file is included.
  572  *
  573  * Here's a quick run-down of the versions:
  574  *  defined(_POSIX_SOURCE)              1003.1-1988
  575  *  _POSIX_C_SOURCE == 1                1003.1-1990
  576  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
  577  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
  578  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
  579  *                                      and the omnibus ISO/IEC 9945-1: 1996
  580  *  _POSIX_C_SOURCE == 200112           1003.1-2001
  581  *  _POSIX_C_SOURCE == 200809           1003.1-2008
  582  *
  583  * In addition, the X/Open Portability Guide, which is now the Single UNIX
  584  * Specification, defines a feature-test macro which indicates the version of
  585  * that specification, and which subsumes _POSIX_C_SOURCE.
  586  *
  587  * Our macros begin with two underscores to avoid namespace screwage.
  588  */
  589 
  590 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  591 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
  592 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
  593 #define _POSIX_C_SOURCE         199009
  594 #endif
  595 
  596 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  597 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
  598 #undef _POSIX_C_SOURCE
  599 #define _POSIX_C_SOURCE         199209
  600 #endif
  601 
  602 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  603 #ifdef _XOPEN_SOURCE
  604 #if _XOPEN_SOURCE - 0 >= 700
  605 #define __XSI_VISIBLE           700
  606 #undef _POSIX_C_SOURCE
  607 #define _POSIX_C_SOURCE         200809
  608 #elif _XOPEN_SOURCE - 0 >= 600
  609 #define __XSI_VISIBLE           600
  610 #undef _POSIX_C_SOURCE
  611 #define _POSIX_C_SOURCE         200112
  612 #elif _XOPEN_SOURCE - 0 >= 500
  613 #define __XSI_VISIBLE           500
  614 #undef _POSIX_C_SOURCE
  615 #define _POSIX_C_SOURCE         199506
  616 #endif
  617 #endif
  618 
  619 /*
  620  * Deal with all versions of POSIX.  The ordering relative to the tests above is
  621  * important.
  622  */
  623 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  624 #define _POSIX_C_SOURCE         198808
  625 #endif
  626 #ifdef _POSIX_C_SOURCE
  627 #if _POSIX_C_SOURCE >= 200809
  628 #define __POSIX_VISIBLE         200809
  629 #define __ISO_C_VISIBLE         1999
  630 #elif _POSIX_C_SOURCE >= 200112
  631 #define __POSIX_VISIBLE         200112
  632 #define __ISO_C_VISIBLE         1999
  633 #elif _POSIX_C_SOURCE >= 199506
  634 #define __POSIX_VISIBLE         199506
  635 #define __ISO_C_VISIBLE         1990
  636 #elif _POSIX_C_SOURCE >= 199309
  637 #define __POSIX_VISIBLE         199309
  638 #define __ISO_C_VISIBLE         1990
  639 #elif _POSIX_C_SOURCE >= 199209
  640 #define __POSIX_VISIBLE         199209
  641 #define __ISO_C_VISIBLE         1990
  642 #elif _POSIX_C_SOURCE >= 199009
  643 #define __POSIX_VISIBLE         199009
  644 #define __ISO_C_VISIBLE         1990
  645 #else
  646 #define __POSIX_VISIBLE         198808
  647 #define __ISO_C_VISIBLE         0
  648 #endif /* _POSIX_C_SOURCE */
  649 #else
  650 /*-
  651  * Deal with _ANSI_SOURCE:
  652  * If it is defined, and no other compilation environment is explicitly
  653  * requested, then define our internal feature-test macros to zero.  This
  654  * makes no difference to the preprocessor (undefined symbols in preprocessing
  655  * expressions are defined to have value zero), but makes it more convenient for
  656  * a test program to print out the values.
  657  *
  658  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
  659  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
  660  * environment (and in fact we will never get here).
  661  */
  662 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
  663 #define __POSIX_VISIBLE         0
  664 #define __XSI_VISIBLE           0
  665 #define __BSD_VISIBLE           0
  666 #define __ISO_C_VISIBLE         1990
  667 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
  668 #define __POSIX_VISIBLE         0
  669 #define __XSI_VISIBLE           0
  670 #define __BSD_VISIBLE           0
  671 #define __ISO_C_VISIBLE         1999
  672 #else                           /* Default environment: show everything. */
  673 #define __POSIX_VISIBLE         200809
  674 #define __XSI_VISIBLE           700
  675 #define __BSD_VISIBLE           1
  676 #define __ISO_C_VISIBLE         1999
  677 #endif
  678 #endif
  679 
  680 #ifndef __has_extension
  681 #define __has_extension  __has_feature
  682 #endif
  683 #ifndef __has_feature
  684 #define __has_feature(x) 0
  685 #endif
  686 #ifndef __has_include
  687 #define __has_include(x) 0
  688 #endif
  689 #ifndef __has_builtin
  690 #define __has_builtin(x) 0
  691 #endif
  692 
  693 #if defined(__mips) || defined(__powerpc64__) || defined(__arm__)
  694 #define __NO_TLS 1
  695 #endif
  696 
  697 #endif /* !_SYS_CDEFS_H_ */

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