The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/sys/cdefs.h

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    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/11/sys/sys/cdefs.h 331722 2018-03-29 02:50:57Z eadler $
   34  */
   35 
   36 #ifndef _SYS_CDEFS_H_
   37 #define _SYS_CDEFS_H_
   38 
   39 /*
   40  * Testing against Clang-specific extensions.
   41  */
   42 #ifndef __has_attribute
   43 #define __has_attribute(x)      0
   44 #endif
   45 #ifndef __has_extension
   46 #define __has_extension         __has_feature
   47 #endif
   48 #ifndef __has_feature
   49 #define __has_feature(x)        0
   50 #endif
   51 #ifndef __has_include
   52 #define __has_include(x)        0
   53 #endif
   54 #ifndef __has_builtin
   55 #define __has_builtin(x)        0
   56 #endif
   57 
   58 #if defined(__cplusplus)
   59 #define __BEGIN_DECLS   extern "C" {
   60 #define __END_DECLS     }
   61 #else
   62 #define __BEGIN_DECLS
   63 #define __END_DECLS
   64 #endif
   65 
   66 /*
   67  * This code has been put in place to help reduce the addition of
   68  * compiler specific defines in FreeBSD code.  It helps to aid in
   69  * having a compiler-agnostic source tree.
   70  */
   71 
   72 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
   73 
   74 #if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
   75 #define __GNUCLIKE_ASM 3
   76 #define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
   77 #else
   78 #define __GNUCLIKE_ASM 2
   79 #endif
   80 #define __GNUCLIKE___TYPEOF 1
   81 #define __GNUCLIKE___OFFSETOF 1
   82 #define __GNUCLIKE___SECTION 1
   83 
   84 #ifndef __INTEL_COMPILER
   85 #define __GNUCLIKE_CTOR_SECTION_HANDLING 1
   86 #endif
   87 
   88 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
   89 #if defined(__INTEL_COMPILER) && defined(__cplusplus) && \
   90    __INTEL_COMPILER < 800
   91 #undef __GNUCLIKE_BUILTIN_CONSTANT_P
   92 #endif
   93 
   94 #if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3)
   95 #define __GNUCLIKE_BUILTIN_VARARGS 1
   96 #define __GNUCLIKE_BUILTIN_STDARG 1
   97 #define __GNUCLIKE_BUILTIN_VAALIST 1
   98 #endif
   99 
  100 #if defined(__GNUC__)
  101 #define __GNUC_VA_LIST_COMPATIBILITY 1
  102 #endif
  103 
  104 /*
  105  * Compiler memory barriers, specific to gcc and clang.
  106  */
  107 #if defined(__GNUC__)
  108 #define __compiler_membar()     __asm __volatile(" " : : : "memory")
  109 #endif
  110 
  111 #ifndef __INTEL_COMPILER
  112 #define __GNUCLIKE_BUILTIN_NEXT_ARG 1
  113 #define __GNUCLIKE_MATH_BUILTIN_RELOPS
  114 #endif
  115 
  116 #define __GNUCLIKE_BUILTIN_MEMCPY 1
  117 
  118 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
  119 #define __CC_SUPPORTS_INLINE 1
  120 #define __CC_SUPPORTS___INLINE 1
  121 #define __CC_SUPPORTS___INLINE__ 1
  122 
  123 #define __CC_SUPPORTS___FUNC__ 1
  124 #define __CC_SUPPORTS_WARNING 1
  125 
  126 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
  127 
  128 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
  129 
  130 #endif /* __GNUC__ || __INTEL_COMPILER */
  131 
  132 /*
  133  * Macro to test if we're using a specific version of gcc or later.
  134  */
  135 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
  136 #define __GNUC_PREREQ__(ma, mi) \
  137         (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
  138 #else
  139 #define __GNUC_PREREQ__(ma, mi) 0
  140 #endif
  141 
  142 /*
  143  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
  144  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
  145  * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
  146  * mode -- there must be no spaces between its arguments, and for nested
  147  * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
  148  * concatenate double-quoted strings produced by the __STRING macro, but
  149  * this only works with ANSI C.
  150  *
  151  * __XSTRING is like __STRING, but it expands any macros in its argument
  152  * first.  It is only available with ANSI C.
  153  */
  154 #if defined(__STDC__) || defined(__cplusplus)
  155 #define __P(protos)     protos          /* full-blown ANSI C */
  156 #define __CONCAT1(x,y)  x ## y
  157 #define __CONCAT(x,y)   __CONCAT1(x,y)
  158 #define __STRING(x)     #x              /* stringify without expanding x */
  159 #define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */
  160 
  161 #define __const         const           /* define reserved names to standard */
  162 #define __signed        signed
  163 #define __volatile      volatile
  164 #if defined(__cplusplus)
  165 #define __inline        inline          /* convert to C++ keyword */
  166 #else
  167 #if !(defined(__CC_SUPPORTS___INLINE))
  168 #define __inline                        /* delete GCC keyword */
  169 #endif /* ! __CC_SUPPORTS___INLINE */
  170 #endif /* !__cplusplus */
  171 
  172 #else   /* !(__STDC__ || __cplusplus) */
  173 #define __P(protos)     ()              /* traditional C preprocessor */
  174 #define __CONCAT(x,y)   x/**/y
  175 #define __STRING(x)     "x"
  176 
  177 #if !defined(__CC_SUPPORTS___INLINE)
  178 #define __const                         /* delete pseudo-ANSI C keywords */
  179 #define __inline
  180 #define __signed
  181 #define __volatile
  182 /*
  183  * In non-ANSI C environments, new programs will want ANSI-only C keywords
  184  * deleted from the program and old programs will want them left alone.
  185  * When using a compiler other than gcc, programs using the ANSI C keywords
  186  * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
  187  * When using "gcc -traditional", we assume that this is the intent; if
  188  * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
  189  */
  190 #ifndef NO_ANSI_KEYWORDS
  191 #define const                           /* delete ANSI C keywords */
  192 #define inline
  193 #define signed
  194 #define volatile
  195 #endif  /* !NO_ANSI_KEYWORDS */
  196 #endif  /* !__CC_SUPPORTS___INLINE */
  197 #endif  /* !(__STDC__ || __cplusplus) */
  198 
  199 /*
  200  * Compiler-dependent macros to help declare dead (non-returning) and
  201  * pure (no side effects) functions, and unused variables.  They are
  202  * null except for versions of gcc that are known to support the features
  203  * properly (old versions of gcc-2 supported the dead and pure features
  204  * in a different (wrong) way).  If we do not provide an implementation
  205  * for a given compiler, let the compile fail if it is told to use
  206  * a feature that we cannot live without.
  207  */
  208 #ifdef lint
  209 #define __dead2
  210 #define __pure2
  211 #define __unused
  212 #define __packed
  213 #define __aligned(x)
  214 #define __alloc_align(x)
  215 #define __alloc_size(x)
  216 #define __alloc_size2(n, x)
  217 #define __section(x)
  218 #define __weak_symbol
  219 #else
  220 #define __weak_symbol   __attribute__((__weak__))
  221 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
  222 #define __dead2
  223 #define __pure2
  224 #define __unused
  225 #endif
  226 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
  227 #define __dead2         __attribute__((__noreturn__))
  228 #define __pure2         __attribute__((__const__))
  229 #define __unused
  230 /* XXX Find out what to do for __packed, __aligned and __section */
  231 #endif
  232 #if __GNUC_PREREQ__(2, 7) || defined(__INTEL_COMPILER)
  233 #define __dead2         __attribute__((__noreturn__))
  234 #define __pure2         __attribute__((__const__))
  235 #define __unused        __attribute__((__unused__))
  236 #define __used          __attribute__((__used__))
  237 #define __packed        __attribute__((__packed__))
  238 #define __aligned(x)    __attribute__((__aligned__(x)))
  239 #define __section(x)    __attribute__((__section__(x)))
  240 #endif
  241 #if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__)
  242 #define __alloc_size(x) __attribute__((__alloc_size__(x)))
  243 #define __alloc_size2(n, x)     __attribute__((__alloc_size__(n, x)))
  244 #else
  245 #define __alloc_size(x)
  246 #define __alloc_size2(n, x)
  247 #endif
  248 #if __GNUC_PREREQ__(4, 9) || __has_attribute(__alloc_align__)
  249 #define __alloc_align(x)        __attribute__((__alloc_align__(x)))
  250 #else
  251 #define __alloc_align(x)
  252 #endif
  253 #endif /* lint */
  254 
  255 #if !__GNUC_PREREQ__(2, 95)
  256 #define __alignof(x)    __offsetof(struct { char __a; x __b; }, __b)
  257 #endif
  258 
  259 /*
  260  * Keywords added in C11.
  261  */
  262 
  263 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L || defined(lint)
  264 
  265 #if !__has_extension(c_alignas)
  266 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
  267     __has_extension(cxx_alignas)
  268 #define _Alignas(x)             alignas(x)
  269 #else
  270 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
  271 #define _Alignas(x)             __aligned(x)
  272 #endif
  273 #endif
  274 
  275 #if defined(__cplusplus) && __cplusplus >= 201103L
  276 #define _Alignof(x)             alignof(x)
  277 #else
  278 #define _Alignof(x)             __alignof(x)
  279 #endif
  280 
  281 #if !defined(__cplusplus) && !__has_extension(c_atomic) && \
  282     !__has_extension(cxx_atomic)
  283 /*
  284  * No native support for _Atomic(). Place object in structure to prevent
  285  * most forms of direct non-atomic access.
  286  */
  287 #define _Atomic(T)              struct { T volatile __val; }
  288 #endif
  289 
  290 #if defined(__cplusplus) && __cplusplus >= 201103L
  291 #define _Noreturn               [[noreturn]]
  292 #else
  293 #define _Noreturn               __dead2
  294 #endif
  295 
  296 #if !__has_extension(c_static_assert)
  297 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
  298     __has_extension(cxx_static_assert)
  299 #define _Static_assert(x, y)    static_assert(x, y)
  300 #elif __GNUC_PREREQ__(4,6) && !defined(__cplusplus)
  301 /* Nothing, gcc 4.6 and higher has _Static_assert built-in */
  302 #elif defined(__COUNTER__)
  303 #define _Static_assert(x, y)    __Static_assert(x, __COUNTER__)
  304 #define __Static_assert(x, y)   ___Static_assert(x, y)
  305 #define ___Static_assert(x, y)  typedef char __assert_ ## y[(x) ? 1 : -1] \
  306                                 __unused
  307 #else
  308 #define _Static_assert(x, y)    struct __hack
  309 #endif
  310 #endif
  311 
  312 #if !__has_extension(c_thread_local)
  313 /*
  314  * XXX: Some compilers (Clang 3.3, GCC 4.7) falsely announce C++11 mode
  315  * without actually supporting the thread_local keyword. Don't check for
  316  * the presence of C++11 when defining _Thread_local.
  317  */
  318 #if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \
  319     __has_extension(cxx_thread_local)
  320 #define _Thread_local           thread_local
  321 #else
  322 #define _Thread_local           __thread
  323 #endif
  324 #endif
  325 
  326 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
  327 
  328 /*
  329  * Emulation of C11 _Generic().  Unlike the previously defined C11
  330  * keywords, it is not possible to implement this using exactly the same
  331  * syntax.  Therefore implement something similar under the name
  332  * __generic().  Unlike _Generic(), this macro can only distinguish
  333  * between a single type, so it requires nested invocations to
  334  * distinguish multiple cases.
  335  */
  336 
  337 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
  338     __has_extension(c_generic_selections)
  339 #define __generic(expr, t, yes, no)                                     \
  340         _Generic(expr, t: yes, default: no)
  341 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
  342 #define __generic(expr, t, yes, no)                                     \
  343         __builtin_choose_expr(                                          \
  344             __builtin_types_compatible_p(__typeof(expr), t), yes, no)
  345 #endif
  346 
  347 /*
  348  * C99 Static array indices in function parameter declarations.  Syntax such as:
  349  * void bar(int myArray[static 10]);
  350  * is allowed in C99 but not in C++.  Define __min_size appropriately so
  351  * headers using it can be compiled in either language.  Use like this:
  352  * void bar(int myArray[__min_size(10)]);
  353  */
  354 #if !defined(__cplusplus) && \
  355     (defined(__clang__) || __GNUC_PREREQ__(4, 6)) && \
  356     (!defined(__STDC_VERSION__) || (__STDC_VERSION__ >= 199901))
  357 #define __min_size(x)   static (x)
  358 #else
  359 #define __min_size(x)   (x)
  360 #endif
  361 
  362 #if __GNUC_PREREQ__(2, 96)
  363 #define __malloc_like   __attribute__((__malloc__))
  364 #define __pure          __attribute__((__pure__))
  365 #else
  366 #define __malloc_like
  367 #define __pure
  368 #endif
  369 
  370 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
  371 #define __always_inline __attribute__((__always_inline__))
  372 #else
  373 #define __always_inline
  374 #endif
  375 
  376 #if __GNUC_PREREQ__(3, 1)
  377 #define __noinline      __attribute__ ((__noinline__))
  378 #else
  379 #define __noinline
  380 #endif
  381 
  382 #if __GNUC_PREREQ__(3, 4)
  383 #define __fastcall      __attribute__((__fastcall__))
  384 #define __result_use_check      __attribute__((__warn_unused_result__))
  385 #else
  386 #define __fastcall
  387 #define __result_use_check
  388 #endif
  389 
  390 #if __GNUC_PREREQ__(4, 1)
  391 #define __returns_twice __attribute__((__returns_twice__))
  392 #else
  393 #define __returns_twice
  394 #endif
  395 
  396 #if __GNUC_PREREQ__(4, 6) || __has_builtin(__builtin_unreachable)
  397 #define __unreachable() __builtin_unreachable()
  398 #else
  399 #define __unreachable() ((void)0)
  400 #endif
  401 
  402 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
  403 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  404 #define __func__        NULL
  405 #endif
  406 
  407 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
  408 #define __LONG_LONG_SUPPORTED
  409 #endif
  410 
  411 /* C++11 exposes a load of C99 stuff */
  412 #if defined(__cplusplus) && __cplusplus >= 201103L
  413 #define __LONG_LONG_SUPPORTED
  414 #ifndef __STDC_LIMIT_MACROS
  415 #define __STDC_LIMIT_MACROS
  416 #endif
  417 #ifndef __STDC_CONSTANT_MACROS
  418 #define __STDC_CONSTANT_MACROS
  419 #endif
  420 #endif
  421 
  422 /*
  423  * GCC 2.95 provides `__restrict' as an extension to C90 to support the
  424  * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
  425  * a way to define the `restrict' type qualifier without disturbing older
  426  * software that is unaware of C99 keywords.
  427  */
  428 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
  429 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
  430 #define __restrict
  431 #else
  432 #define __restrict      restrict
  433 #endif
  434 #endif
  435 
  436 /*
  437  * GNU C version 2.96 adds explicit branch prediction so that
  438  * the CPU back-end can hint the processor and also so that
  439  * code blocks can be reordered such that the predicted path
  440  * sees a more linear flow, thus improving cache behavior, etc.
  441  *
  442  * The following two macros provide us with a way to utilize this
  443  * compiler feature.  Use __predict_true() if you expect the expression
  444  * to evaluate to true, and __predict_false() if you expect the
  445  * expression to evaluate to false.
  446  *
  447  * A few notes about usage:
  448  *
  449  *      * Generally, __predict_false() error condition checks (unless
  450  *        you have some _strong_ reason to do otherwise, in which case
  451  *        document it), and/or __predict_true() `no-error' condition
  452  *        checks, assuming you want to optimize for the no-error case.
  453  *
  454  *      * Other than that, if you don't know the likelihood of a test
  455  *        succeeding from empirical or other `hard' evidence, don't
  456  *        make predictions.
  457  *
  458  *      * These are meant to be used in places that are run `a lot'.
  459  *        It is wasteful to make predictions in code that is run
  460  *        seldomly (e.g. at subsystem initialization time) as the
  461  *        basic block reordering that this affects can often generate
  462  *        larger code.
  463  */
  464 #if __GNUC_PREREQ__(2, 96)
  465 #define __predict_true(exp)     __builtin_expect((exp), 1)
  466 #define __predict_false(exp)    __builtin_expect((exp), 0)
  467 #else
  468 #define __predict_true(exp)     (exp)
  469 #define __predict_false(exp)    (exp)
  470 #endif
  471 
  472 #if __GNUC_PREREQ__(4, 0)
  473 #define __null_sentinel __attribute__((__sentinel__))
  474 #define __exported      __attribute__((__visibility__("default")))
  475 #define __hidden        __attribute__((__visibility__("hidden")))
  476 #else
  477 #define __null_sentinel
  478 #define __exported
  479 #define __hidden
  480 #endif
  481 
  482 /*
  483  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  484  * require it.
  485  */
  486 #if __GNUC_PREREQ__(4, 1)
  487 #define __offsetof(type, field)  __builtin_offsetof(type, field)
  488 #else
  489 #ifndef __cplusplus
  490 #define __offsetof(type, field) \
  491         ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
  492 #else
  493 #define __offsetof(type, field)                                 \
  494   (__offsetof__ (reinterpret_cast <__size_t>                    \
  495                  (&reinterpret_cast <const volatile char &>     \
  496                   (static_cast<type *> (0)->field))))
  497 #endif
  498 #endif
  499 #define __rangeof(type, start, end) \
  500         (__offsetof(type, end) - __offsetof(type, start))
  501 
  502 /*
  503  * Given the pointer x to the member m of the struct s, return
  504  * a pointer to the containing structure.  When using GCC, we first
  505  * assign pointer x to a local variable, to check that its type is
  506  * compatible with member m.
  507  */
  508 #if __GNUC_PREREQ__(3, 1)
  509 #define __containerof(x, s, m) ({                                       \
  510         const volatile __typeof(((s *)0)->m) *__x = (x);                \
  511         __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
  512 })
  513 #else
  514 #define __containerof(x, s, m)                                          \
  515         __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
  516 #endif
  517 
  518 /*
  519  * Compiler-dependent macros to declare that functions take printf-like
  520  * or scanf-like arguments.  They are null except for versions of gcc
  521  * that are known to support the features properly (old versions of gcc-2
  522  * didn't permit keeping the keywords out of the application namespace).
  523  */
  524 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  525 #define __printflike(fmtarg, firstvararg)
  526 #define __scanflike(fmtarg, firstvararg)
  527 #define __format_arg(fmtarg)
  528 #define __strfmonlike(fmtarg, firstvararg)
  529 #define __strftimelike(fmtarg, firstvararg)
  530 #else
  531 #define __printflike(fmtarg, firstvararg) \
  532             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  533 #define __scanflike(fmtarg, firstvararg) \
  534             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  535 #define __format_arg(fmtarg)    __attribute__((__format_arg__ (fmtarg)))
  536 #define __strfmonlike(fmtarg, firstvararg) \
  537             __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
  538 #define __strftimelike(fmtarg, firstvararg) \
  539             __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
  540 #endif
  541 
  542 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  543 #if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \
  544     defined(__GNUC__) && !defined(__INTEL_COMPILER)
  545 #define __printf0like(fmtarg, firstvararg) \
  546             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  547 #else
  548 #define __printf0like(fmtarg, firstvararg)
  549 #endif
  550 
  551 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  552 #ifndef __INTEL_COMPILER
  553 #define __strong_reference(sym,aliassym)        \
  554         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
  555 #endif
  556 #ifdef __STDC__
  557 #define __weak_reference(sym,alias)     \
  558         __asm__(".weak " #alias);       \
  559         __asm__(".equ "  #alias ", " #sym)
  560 #define __warn_references(sym,msg)      \
  561         __asm__(".section .gnu.warning." #sym); \
  562         __asm__(".asciz \"" msg "\"");  \
  563         __asm__(".previous")
  564 #define __sym_compat(sym,impl,verid)    \
  565         __asm__(".symver " #impl ", " #sym "@" #verid)
  566 #define __sym_default(sym,impl,verid)   \
  567         __asm__(".symver " #impl ", " #sym "@@" #verid)
  568 #else
  569 #define __weak_reference(sym,alias)     \
  570         __asm__(".weak alias");         \
  571         __asm__(".equ alias, sym")
  572 #define __warn_references(sym,msg)      \
  573         __asm__(".section .gnu.warning.sym"); \
  574         __asm__(".asciz \"msg\"");      \
  575         __asm__(".previous")
  576 #define __sym_compat(sym,impl,verid)    \
  577         __asm__(".symver impl, sym@verid")
  578 #define __sym_default(impl,sym,verid)   \
  579         __asm__(".symver impl, sym@@verid")
  580 #endif  /* __STDC__ */
  581 #endif  /* __GNUC__ || __INTEL_COMPILER */
  582 
  583 #define __GLOBL1(sym)   __asm__(".globl " #sym)
  584 #define __GLOBL(sym)    __GLOBL1(sym)
  585 
  586 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  587 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
  588 #else
  589 /*
  590  * The following definition might not work well if used in header files,
  591  * but it should be better than nothing.  If you want a "do nothing"
  592  * version, then it should generate some harmless declaration, such as:
  593  *    #define   __IDSTRING(name,string) struct __hack
  594  */
  595 #define __IDSTRING(name,string) static const char name[] __unused = string
  596 #endif
  597 
  598 /*
  599  * Embed the rcs id of a source file in the resulting library.  Note that in
  600  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
  601  * Usage:
  602  *      __FBSDID("$FreeBSD: stable/11/sys/sys/cdefs.h 331722 2018-03-29 02:50:57Z eadler $");
  603  */
  604 #ifndef __FBSDID
  605 #if !defined(lint) && !defined(STRIP_FBSDID)
  606 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  607 #else
  608 #define __FBSDID(s)     struct __hack
  609 #endif
  610 #endif
  611 
  612 #ifndef __RCSID
  613 #ifndef NO__RCSID
  614 #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  615 #else
  616 #define __RCSID(s)      struct __hack
  617 #endif
  618 #endif
  619 
  620 #ifndef __RCSID_SOURCE
  621 #ifndef NO__RCSID_SOURCE
  622 #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
  623 #else
  624 #define __RCSID_SOURCE(s)       struct __hack
  625 #endif
  626 #endif
  627 
  628 #ifndef __SCCSID
  629 #ifndef NO__SCCSID
  630 #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
  631 #else
  632 #define __SCCSID(s)     struct __hack
  633 #endif
  634 #endif
  635 
  636 #ifndef __COPYRIGHT
  637 #ifndef NO__COPYRIGHT
  638 #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
  639 #else
  640 #define __COPYRIGHT(s)  struct __hack
  641 #endif
  642 #endif
  643 
  644 #ifndef __DECONST
  645 #define __DECONST(type, var)    ((type)(__uintptr_t)(const void *)(var))
  646 #endif
  647 
  648 #ifndef __DEVOLATILE
  649 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
  650 #endif
  651 
  652 #ifndef __DEQUALIFY
  653 #define __DEQUALIFY(type, var)  ((type)(__uintptr_t)(const volatile void *)(var))
  654 #endif
  655 
  656 /*-
  657  * The following definitions are an extension of the behavior originally
  658  * implemented in <sys/_posix.h>, but with a different level of granularity.
  659  * POSIX.1 requires that the macros we test be defined before any standard
  660  * header file is included.
  661  *
  662  * Here's a quick run-down of the versions:
  663  *  defined(_POSIX_SOURCE)              1003.1-1988
  664  *  _POSIX_C_SOURCE == 1                1003.1-1990
  665  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
  666  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
  667  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
  668  *                                      and the omnibus ISO/IEC 9945-1: 1996
  669  *  _POSIX_C_SOURCE == 200112           1003.1-2001
  670  *  _POSIX_C_SOURCE == 200809           1003.1-2008
  671  *
  672  * In addition, the X/Open Portability Guide, which is now the Single UNIX
  673  * Specification, defines a feature-test macro which indicates the version of
  674  * that specification, and which subsumes _POSIX_C_SOURCE.
  675  *
  676  * Our macros begin with two underscores to avoid namespace screwage.
  677  */
  678 
  679 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  680 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
  681 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
  682 #define _POSIX_C_SOURCE         199009
  683 #endif
  684 
  685 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  686 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
  687 #undef _POSIX_C_SOURCE
  688 #define _POSIX_C_SOURCE         199209
  689 #endif
  690 
  691 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  692 #ifdef _XOPEN_SOURCE
  693 #if _XOPEN_SOURCE - 0 >= 700
  694 #define __XSI_VISIBLE           700
  695 #undef _POSIX_C_SOURCE
  696 #define _POSIX_C_SOURCE         200809
  697 #elif _XOPEN_SOURCE - 0 >= 600
  698 #define __XSI_VISIBLE           600
  699 #undef _POSIX_C_SOURCE
  700 #define _POSIX_C_SOURCE         200112
  701 #elif _XOPEN_SOURCE - 0 >= 500
  702 #define __XSI_VISIBLE           500
  703 #undef _POSIX_C_SOURCE
  704 #define _POSIX_C_SOURCE         199506
  705 #endif
  706 #endif
  707 
  708 /*
  709  * Deal with all versions of POSIX.  The ordering relative to the tests above is
  710  * important.
  711  */
  712 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  713 #define _POSIX_C_SOURCE         198808
  714 #endif
  715 #ifdef _POSIX_C_SOURCE
  716 #if _POSIX_C_SOURCE >= 200809
  717 #define __POSIX_VISIBLE         200809
  718 #define __ISO_C_VISIBLE         1999
  719 #elif _POSIX_C_SOURCE >= 200112
  720 #define __POSIX_VISIBLE         200112
  721 #define __ISO_C_VISIBLE         1999
  722 #elif _POSIX_C_SOURCE >= 199506
  723 #define __POSIX_VISIBLE         199506
  724 #define __ISO_C_VISIBLE         1990
  725 #elif _POSIX_C_SOURCE >= 199309
  726 #define __POSIX_VISIBLE         199309
  727 #define __ISO_C_VISIBLE         1990
  728 #elif _POSIX_C_SOURCE >= 199209
  729 #define __POSIX_VISIBLE         199209
  730 #define __ISO_C_VISIBLE         1990
  731 #elif _POSIX_C_SOURCE >= 199009
  732 #define __POSIX_VISIBLE         199009
  733 #define __ISO_C_VISIBLE         1990
  734 #else
  735 #define __POSIX_VISIBLE         198808
  736 #define __ISO_C_VISIBLE         0
  737 #endif /* _POSIX_C_SOURCE */
  738 #else
  739 /*-
  740  * Deal with _ANSI_SOURCE:
  741  * If it is defined, and no other compilation environment is explicitly
  742  * requested, then define our internal feature-test macros to zero.  This
  743  * makes no difference to the preprocessor (undefined symbols in preprocessing
  744  * expressions are defined to have value zero), but makes it more convenient for
  745  * a test program to print out the values.
  746  *
  747  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
  748  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
  749  * environment (and in fact we will never get here).
  750  */
  751 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
  752 #define __POSIX_VISIBLE         0
  753 #define __XSI_VISIBLE           0
  754 #define __BSD_VISIBLE           0
  755 #define __ISO_C_VISIBLE         1990
  756 #define __EXT1_VISIBLE          0
  757 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
  758 #define __POSIX_VISIBLE         0
  759 #define __XSI_VISIBLE           0
  760 #define __BSD_VISIBLE           0
  761 #define __ISO_C_VISIBLE         1999
  762 #define __EXT1_VISIBLE          0
  763 #elif defined(_C11_SOURCE)      /* Localism to specify strict C11 env. */
  764 #define __POSIX_VISIBLE         0
  765 #define __XSI_VISIBLE           0
  766 #define __BSD_VISIBLE           0
  767 #define __ISO_C_VISIBLE         2011
  768 #define __EXT1_VISIBLE          0
  769 #else                           /* Default environment: show everything. */
  770 #define __POSIX_VISIBLE         200809
  771 #define __XSI_VISIBLE           700
  772 #define __BSD_VISIBLE           1
  773 #define __ISO_C_VISIBLE         2011
  774 #define __EXT1_VISIBLE          1
  775 #endif
  776 #endif
  777 
  778 /* User override __EXT1_VISIBLE */
  779 #if defined(__STDC_WANT_LIB_EXT1__)
  780 #undef  __EXT1_VISIBLE
  781 #if __STDC_WANT_LIB_EXT1__
  782 #define __EXT1_VISIBLE          1
  783 #else
  784 #define __EXT1_VISIBLE          0
  785 #endif
  786 #endif /* __STDC_WANT_LIB_EXT1__ */
  787 
  788 #if defined(__mips) || defined(__powerpc64__) || defined(__riscv__)
  789 #define __NO_TLS 1
  790 #endif
  791 
  792 /*
  793  * Old versions of GCC use non-standard ARM arch symbols; acle-compat.h
  794  * translates them to __ARM_ARCH and the modern feature symbols defined by ARM.
  795  */
  796 #if defined(__arm__) && !defined(__ARM_ARCH)
  797 #include <machine/acle-compat.h>
  798 #endif
  799 
  800 /*
  801  * Nullability qualifiers: currently only supported by Clang.
  802  */
  803 #if !(defined(__clang__) && __has_feature(nullability))
  804 #define _Nonnull
  805 #define _Nullable
  806 #define _Null_unspecified
  807 #define __NULLABILITY_PRAGMA_PUSH
  808 #define __NULLABILITY_PRAGMA_POP
  809 #else
  810 #define __NULLABILITY_PRAGMA_PUSH _Pragma("clang diagnostic push")      \
  811         _Pragma("clang diagnostic ignored \"-Wnullability-completeness\"")
  812 #define __NULLABILITY_PRAGMA_POP _Pragma("clang diagnostic pop")
  813 #endif
  814 
  815 /*
  816  * Type Safety Checking
  817  *
  818  * Clang provides additional attributes to enable checking type safety
  819  * properties that cannot be enforced by the C type system. 
  820  */
  821 
  822 #if __has_attribute(__argument_with_type_tag__) && \
  823     __has_attribute(__type_tag_for_datatype__) && !defined(lint)
  824 #define __arg_type_tag(arg_kind, arg_idx, type_tag_idx) \
  825             __attribute__((__argument_with_type_tag__(arg_kind, arg_idx, type_tag_idx)))
  826 #define __datatype_type_tag(kind, type) \
  827             __attribute__((__type_tag_for_datatype__(kind, type)))
  828 #else
  829 #define __arg_type_tag(arg_kind, arg_idx, type_tag_idx)
  830 #define __datatype_type_tag(kind, type)
  831 #endif
  832 
  833 /*
  834  * Lock annotations.
  835  *
  836  * Clang provides support for doing basic thread-safety tests at
  837  * compile-time, by marking which locks will/should be held when
  838  * entering/leaving a functions.
  839  *
  840  * Furthermore, it is also possible to annotate variables and structure
  841  * members to enforce that they are only accessed when certain locks are
  842  * held.
  843  */
  844 
  845 #if __has_extension(c_thread_safety_attributes)
  846 #define __lock_annotate(x)      __attribute__((x))
  847 #else
  848 #define __lock_annotate(x)
  849 #endif
  850 
  851 /* Structure implements a lock. */
  852 #define __lockable              __lock_annotate(lockable)
  853 
  854 /* Function acquires an exclusive or shared lock. */
  855 #define __locks_exclusive(...) \
  856         __lock_annotate(exclusive_lock_function(__VA_ARGS__))
  857 #define __locks_shared(...) \
  858         __lock_annotate(shared_lock_function(__VA_ARGS__))
  859 
  860 /* Function attempts to acquire an exclusive or shared lock. */
  861 #define __trylocks_exclusive(...) \
  862         __lock_annotate(exclusive_trylock_function(__VA_ARGS__))
  863 #define __trylocks_shared(...) \
  864         __lock_annotate(shared_trylock_function(__VA_ARGS__))
  865 
  866 /* Function releases a lock. */
  867 #define __unlocks(...)          __lock_annotate(unlock_function(__VA_ARGS__))
  868 
  869 /* Function asserts that an exclusive or shared lock is held. */
  870 #define __asserts_exclusive(...) \
  871         __lock_annotate(assert_exclusive_lock(__VA_ARGS__))
  872 #define __asserts_shared(...) \
  873         __lock_annotate(assert_shared_lock(__VA_ARGS__))
  874 
  875 /* Function requires that an exclusive or shared lock is or is not held. */
  876 #define __requires_exclusive(...) \
  877         __lock_annotate(exclusive_locks_required(__VA_ARGS__))
  878 #define __requires_shared(...) \
  879         __lock_annotate(shared_locks_required(__VA_ARGS__))
  880 #define __requires_unlocked(...) \
  881         __lock_annotate(locks_excluded(__VA_ARGS__))
  882 
  883 /* Function should not be analyzed. */
  884 #define __no_lock_analysis      __lock_annotate(no_thread_safety_analysis)
  885 
  886 /* Guard variables and structure members by lock. */
  887 #define __guarded_by(x)         __lock_annotate(guarded_by(x))
  888 #define __pt_guarded_by(x)      __lock_annotate(pt_guarded_by(x))
  889 
  890 #endif /* !_SYS_CDEFS_H_ */

Cache object: 24952c725c731459f09aaad43e74696a


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.