sys/sys/cdefs.h

   1 /*
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Berkeley Software Design, Inc.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. 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: src/sys/sys/cdefs.h,v 1.28.2.8 2002/09/18 04:05:13 mikeh Exp $
  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 /*
  59  * Macro to test if we are using a specific version of gcc or later.
  60  */
  61 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
  62 #define __GNUC_PREREQ__(ma, mi) \
  63         (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
  64 #else
  65 #define __GNUC_PREREQ__(ma, mi) 0
  66 #endif
  67
  68 #if defined(__cplusplus)
  69 #if __GNUC_PREREQ__(4, 0)
  70 #define __BEGIN_DECLS   _Pragma("GCC visibility push(default)") extern "C" {
  71 #define __END_DECLS     } _Pragma("GCC visibility pop")
  72 #else
  73 #define __BEGIN_DECLS   extern "C" {
  74 #define __END_DECLS     }
  75 #endif
  76 #else
  77 #define __BEGIN_DECLS
  78 #define __END_DECLS
  79 #endif
  80
  81 /*
  82  * The __VM_CACHELINE_SIZE macro defines the common cache line alignment
  83  * size that can be found across most recent and somewhat latest Intel
  84  * hardware, i.e. L1 cache sizes etc.
  85  *
  86  * If needed, this value can be TUNED.  Suitable values for this macro
  87  * are 32, 64 and 128 bytes.  The unit of measurement for this macro is
  88  * bytes.
  89  *
  90  * XXX: This macro and related macros will eventually move to a MD
  91  * header, but currently, we do need such a hierarchy.
  92  */
  93 #define __VM_CACHELINE_SIZE     64
  94 #define __VM_CACHELINE_MASK     (__VM_CACHELINE_SIZE - 1)
  95 #define __VM_CACHELINE_ALIGN(n) \
  96         (((n) + __VM_CACHELINE_MASK) & ~__VM_CACHELINE_MASK)
  97
  98 /*
  99  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
 100  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
 101  * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
 102  * mode -- there must be no spaces between its arguments, and for nested
 103  * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
 104  * concatenate double-quoted strings produced by the __STRING macro, but
 105  * this only works with ANSI C.
 106  *
 107  * __XSTRING is like __STRING, but it expands any macros in its argument
 108  * first.  It is only available with ANSI C.
 109  */
 110 #if defined(__STDC__) || defined(__cplusplus)
 111 #define __P(protos)     protos          /* full-blown ANSI C */
 112 #define __CONCAT1(x,y)  x ## y
 113 #define __CONCAT(x,y)   __CONCAT1(x,y)
 114 #define __STRING(x)     #x              /* stringify without expanding x */
 115 #define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */
 116
 117 #define __const         const           /* define reserved names to standard */
 118 #define __signed        signed
 119 #define __volatile      volatile
 120 #if defined(__cplusplus)
 121 #define __inline        inline          /* convert to C++ keyword */
 122 #else
 123 #ifndef __GNUC__
 124 #define __inline                        /* delete GCC keyword */
 125 #endif /* !__GNUC__ */
 126 #endif /* !__cplusplus */
 127
 128 #else   /* !(__STDC__ || __cplusplus) */
 129 #define __P(protos)     ()              /* traditional C preprocessor */
 130 #define __CONCAT(x,y)   x/**/y
 131 #define __STRING(x)     "x"
 132
 133 #ifndef __GNUC__
 134 #define __const                         /* delete pseudo-ANSI C keywords */
 135 #define __inline
 136 #define __signed
 137 #define __volatile
 138 /*
 139  * In non-ANSI C environments, new programs will want ANSI-only C keywords
 140  * deleted from the program and old programs will want them left alone.
 141  * When using a compiler other than gcc, programs using the ANSI C keywords
 142  * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
 143  * When using "gcc -traditional", we assume that this is the intent; if
 144  * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
 145  */
 146 #ifndef NO_ANSI_KEYWORDS
 147 #define const                           /* delete ANSI C keywords */
 148 #define inline
 149 #define signed
 150 #define volatile
 151 #endif  /* !NO_ANSI_KEYWORDS */
 152 #endif  /* !__GNUC__ */
 153 #endif  /* !(__STDC__ || __cplusplus) */
 154
 155 /*
 156  * Compiler-dependent macros to help declare dead (non-returning) and
 157  * pure (no side effects) functions, and unused variables.  They are
 158  * null except for versions of gcc that are known to support the features
 159  * properly (old versions of gcc-2 supported the dead and pure features
 160  * in a different (wrong) way).
 161  */
 162 #ifdef lint
 163 #define __dead2
 164 #define __pure
 165 #define __pure2
 166 #define __unused
 167 #define __packed
 168 #define __aligned(x)
 169 #define __alloc_align(x)
 170 #define __alloc_size(x)
 171 #define __section(x)
 172 #define __always_inline
 173 #define __nonnull(x)
 174 #define __heedresult
 175 #define __malloclike
 176 #define __returns_twice
 177 #define __weak_symbol
 178
 179 #else
 180
 181 #define __weak_symbol   __attribute__((__weak__))
 182 #if __GNUC_PREREQ__(2, 7)
 183 #define __dead2         __attribute__((__noreturn__))
 184 #define __pure2         __attribute__((__const__))
 185 #define __unused        __attribute__((__unused__))
 186 #define __packed        __attribute__((__packed__))
 187 #define __aligned(x)    __attribute__((__aligned__(x)))
 188 #define __section(x)    __attribute__((__section__(x)))
 189 #else
 190 #define __dead2
 191 #define __pure2
 192 #define __unused
 193 #endif
 194
 195 #if __GNUC_PREREQ__(2, 96)
 196 #define __malloclike    __attribute__((__malloc__))
 197 #define __pure          __attribute__((__pure__))
 198 #else
 199 #define __malloclike
 200 #define __pure          __pure2
 201 #endif
 202
 203 #if __GNUC_PREREQ__(3, 1)
 204 #define __always_inline __attribute__((__always_inline__))
 205 #define __noinline      __attribute__((__noinline__))
 206 #else
 207 #define __always_inline
 208 #define __noinline
 209 #endif
 210
 211 #if __GNUC_PREREQ__(3, 3)
 212 #define __nonnull(x)    __attribute__((__nonnull__(x)))
 213 #define __used          __attribute__((__used__))
 214 #else
 215 #define __nonnull(x)
 216 #define __used          __unused
 217 #endif
 218
 219 #if __GNUC_PREREQ__(3, 4)
 220 #define __heedresult    __attribute__((__warn_unused_result__))
 221 #else
 222 #define __heedresult
 223 #endif
 224
 225 #if __GNUC_PREREQ__(4, 1)
 226 #define __returns_twice __attribute__((__returns_twice__))
 227 #else
 228 #define __returns_twice
 229 #endif
 230
 231 #if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__)
 232 #define __alloc_size(x) __attribute__((__alloc_size__(x)))
 233 #else
 234 #define __alloc_size(x)
 235 #endif
 236
 237 #if __GNUC_PREREQ__(4, 9) || __has_attribute(__alloc_align__)
 238 #define __alloc_align(x)        __attribute__((__alloc_align__(x)))
 239 #else
 240 #define __alloc_align(x)
 241 #endif
 242
 243 #endif  /* LINT */
 244
 245 #if !__GNUC_PREREQ__(2, 7) && __STDC_VERSION__ < 199901
 246 #define __func__        NULL
 247 #endif
 248
 249 #if (__GNUC_PREREQ__(2, 0) && !defined(__STRICT_ANSI__)) || \
 250     __STDC_VERSION__ >= 199901
 251 #define __LONG_LONG_SUPPORTED
 252 #endif
 253
 254 /* C++11 exposes a load of C99 stuff */
 255 #if defined(__cplusplus) && __cplusplus >= 201103L
 256 #define __LONG_LONG_SUPPORTED
 257 #ifndef __STDC_LIMIT_MACROS
 258 #define __STDC_LIMIT_MACROS
 259 #endif
 260 #ifndef __STDC_CONSTANT_MACROS
 261 #define __STDC_CONSTANT_MACROS
 262 #endif
 263 #endif
 264
 265 /*
 266  * GCC 2.95 and later provides `__restrict' as an extension to C90 to support
 267  * the C99-specific `restrict' type qualifier.  We happen to use `__restrict'
 268  * as a way to define the `restrict' type qualifier without disturbing older
 269  * software that is unaware of C99 keywords.
 270  */
 271 #if !__GNUC_PREREQ__(2, 95)
 272 #if __STDC_VERSION__ < 199901
 273 #define __restrict
 274 #else
 275 #define __restrict      restrict
 276 #endif
 277 #endif
 278
 279 /*
 280  * GNU C version 2.96 adds explicit branch prediction so that
 281  * the CPU back-end can hint the processor and also so that
 282  * code blocks can be reordered such that the predicted path
 283  * sees a more linear flow, thus improving cache behavior, etc.
 284  *
 285  * The following two macros provide us with a way to utilize this
 286  * compiler feature.  Use __predict_true() if you expect the expression
 287  * to evaluate to true, and __predict_false() if you expect the
 288  * expression to evaluate to false.
 289  *
 290  * A few notes about usage:
 291  *
 292  *      * Generally, __predict_false() error condition checks (unless
 293  *        you have some _strong_ reason to do otherwise, in which case
 294  *        document it), and/or __predict_true() `no-error' condition
 295  *        checks, assuming you want to optimize for the no-error case.
 296  *
 297  *      * Other than that, if you don't know the likelihood of a test
 298  *        succeeding from empirical or other `hard' evidence, don't
 299  *        make predictions.
 300  *
 301  *      * These are meant to be used in places that are run `a lot'.
 302  *        It is wasteful to make predictions in code that is run
 303  *        seldomly (e.g. at subsystem initialization time) as the
 304  *        basic block reordering that this affects can often generate
 305  *        larger code.
 306  */
 307 #if __GNUC_PREREQ__(2, 96)
 308 #define __predict_true(exp)     __builtin_expect((exp), 1)
 309 #define __predict_false(exp)    __builtin_expect((exp), 0)
 310 #else
 311 #define __predict_true(exp)     (exp)
 312 #define __predict_false(exp)    (exp)
 313 #endif
 314
 315 /*
 316  * Compiler-dependent macros to declare that functions take printf-like
 317  * or scanf-like arguments.  They are null except for versions of gcc
 318  * that are known to support the features properly (old versions of gcc-2
 319  * didn't permit keeping the keywords out of the application namespace).
 320  *
 321  * The printf0like macro for GCC 2 uses DragonFly specific compiler extensions.
 322  */
 323 #if !__GNUC_PREREQ__(2, 7)
 324 #define __printflike(fmtarg, firstvararg)
 325 #define __scanflike(fmtarg, firstvararg)
 326 #define __printf0like(fmtarg, firstvararg)
 327 #define __format_arg(fmtarg)
 328 #define __strfmonlike(fmtarg, firstvararg)
 329 #define __strftimelike(fmtarg, firstvararg)
 330
 331 #elif __GNUC_PREREQ__(3, 0)
 332 #define __printflike(fmtarg, firstvararg) \
 333             __attribute__((__nonnull__(fmtarg), \
 334                           __format__ (__printf__, fmtarg, firstvararg)))
 335 #define __printf0like(fmtarg, firstvararg) \
 336             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
 337 #define __scanflike(fmtarg, firstvararg) \
 338             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
 339 #define __format_arg(fmtarg) \
 340             __attribute__((__format_arg__ (fmtarg)))
 341 #define __strfmonlike(fmtarg, firstvararg) \
 342             __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
 343 #define __strftimelike(fmtarg, firstvararg) \
 344             __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
 345
 346 #else
 347 #define __printflike(fmtarg, firstvararg) \
 348             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
 349 #define __printf0like(fmtarg, firstvararg) \
 350             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
 351 #define __scanflike(fmtarg, firstvararg) \
 352             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
 353 #define __format_arg(fmtarg) \
 354             __attribute__((__format_arg__ (fmtarg)))
 355 #define __strfmonlike(fmtarg, firstvararg) \
 356             __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
 357 #define __strftimelike(fmtarg, firstvararg) \
 358             __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
 359 #endif
 360
 361 #if !__GNUC_PREREQ__(3, 0)
 362 #define __ARRAY_ZERO    0
 363 #else
 364 #define __ARRAY_ZERO
 365 #endif
 366
 367 #if __GNUC_PREREQ__(4, 0)
 368 #define __dso_public    __attribute__((__visibility__("default")))
 369 #define __dso_hidden    __attribute__((__visibility__("hidden")))
 370 #else
 371 #define __dso_public
 372 #define __dso_hidden
 373 #endif
 374
 375 /*
 376  * A convenient constructor macro, GCC 4.3.0 added priority support to
 377  * constructors, provide a compatible interface for both.
 378  */
 379 #if __GNUC_PREREQ__(4, 3)
 380 #define __constructor(prio)     __attribute__((constructor(prio)))
 381 #else
 382 #define __constructor(prio)     __attribute__((constructor))
 383 #endif
 384
 385 /*
 386  * Handy GCC based macros:
 387  *
 388  *      __cachealign:
 389  *
 390  *      The __cachealign macro can be used for cache line aligning structures
 391  *      of small to medium size.  It aligns the particular structure or
 392  *      storage type to a system default cache line alignment, thus giving us
 393  *      a much more better cache utilization by making the hardware work at
 394  *      its best burst speeds.
 395  *
 396  *      __usereg:
 397  *
 398  *      The __usereg macro can/should be used when a function contains
 399  *      arguments not more than 3.  It can be very useful to us due to the
 400  *      message-passing nature of the kernel.
 401  *
 402  * !!NOTE - USAGE INFORMATION!!
 403  *
 404  * The __cachealign macro should not be used for data structures that are
 405  * as big struct proc, struct vnode, struct thread, and other structs which
 406  * are as big as them; simply because it will be useless in that case.
 407  *
 408  * The __usereg macro should be used whenever possible, i.e., when a function
 409  * does not exceed more than 3 arguments, and should not be used for vararg
 410  * type functions.
 411  *
 412  * In other words, AVOID MISUSE OF THESE MACROS. :-)
 413  */
 414 #ifdef __GNUC__
 415 #define __cachealign    __attribute__((__aligned__(__VM_CACHELINE_SIZE)))
 416 #define __usereg        __attribute__((__regparm__(3)))
 417 #else
 418 #define __cachealign
 419 #define __usereg
 420 #endif
 421
 422 #ifdef __GNUC__
 423 #define __strong_reference(sym,aliassym)        \
 424         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
 425 #define __weak_reference(sym,aliassym)  \
 426         __strong_reference(sym,aliassym) __attribute__ ((__weak__))
 427 #define __weak_reference_asm(sym,alias) \
 428         __asm__(".weak " #alias);       \
 429         __asm__(".equ "  #alias ", " #sym)
 430 #define __warn_references(sym,msg)      \
 431         __asm__(".section .gnu.warning." #sym); \
 432         __asm__(".asciz \"" msg "\"");  \
 433         __asm__(".previous")
 434 #endif  /* __GNUC__ */
 435
 436 #if defined(__GNUC__)
 437 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
 438 #endif
 439
 440 #ifndef __RCSID
 441 #define __RCSID(s)              struct __hack
 442 #endif
 443
 444 #ifndef __RCSID_SOURCE
 445 #define __RCSID_SOURCE(s)       struct __hack
 446 #endif
 447
 448 #ifndef __SCCSID
 449 #define __SCCSID(s)             struct __hack
 450 #endif
 451
 452 #ifndef __FBSDID
 453 #define __FBSDID(s)             struct __hack
 454 #endif
 455
 456 #ifndef __COPYRIGHT
 457 #define __COPYRIGHT(s)          struct __hack
 458 #endif
 459
 460 #ifndef __DECONST
 461 #define __DECONST(type, var)    ((type)(uintptr_t)(const void *)(var))
 462 #endif
 463
 464 #ifndef __DEVOLATILE
 465 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
 466 #endif
 467
 468 #ifndef __DEQUALIFY
 469 #define __DEQUALIFY(type, var)  ((type)(uintptr_t)(const volatile void *)(var))
 470 #endif
 471
 472 /*
 473  * Keywords added in C11.
 474  */
 475
 476 #if !__GNUC_PREREQ__(2, 95)
 477 #define __alignof(x)    __offsetof(struct { char __a; x __b; }, __b)
 478 #endif
 479
 480 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
 481
 482 #if !__has_extension(c_alignas)
 483 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
 484     __has_extension(cxx_alignas)
 485 #define _Alignas(x)             alignas(x)
 486 #else
 487 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
 488 #define _Alignas(x)             __aligned(x)
 489 #endif
 490 #endif
 491
 492 #if defined(__cplusplus) && __cplusplus >= 201103L
 493 #define _Alignof(x)             alignof(x)
 494 #else
 495 #define _Alignof(x)             __alignof(x)
 496 #endif
 497
 498 #if !defined(_Noreturn)
 499 #define _Noreturn               __dead2
 500 #endif
 501
 502 #if !__has_extension(c_static_assert)
 503 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
 504     __has_extension(cxx_static_assert)
 505 #define _Static_assert(x, y)    static_assert(x, y)
 506 #elif !__GNUC_PREREQ__(4, 6)
 507 #define _Static_assert(x, y)    struct __hack
 508 #ifdef _KERNEL
 509 #define CTASSERT(x)             _CTASSERT(x, __LINE__)
 510 #define _CTASSERT(x, y)         __CTASSERT(x, y)
 511 #define __CTASSERT(x, y)        typedef char __assert ## y[(x) ? 1 : -1]
 512 #endif
 513 #endif
 514 #endif
 515
 516 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
 517
 518 #if defined(_KERNEL) && !defined(CTASSERT)
 519 #define CTASSERT(x)             _Static_assert(x, \
 520                                     "compile-time assertion failed")
 521 #endif
 522
 523 /*
 524  * Emulation of C11 _Generic().  Unlike the previously defined C11
 525  * keywords, it is not possible to implement this using exactly the same
 526  * syntax.  Therefore implement something similar under the name
 527  * __generic().  Unlike _Generic(), this macro can only distinguish
 528  * between a single type, so it requires nested invocations to
 529  * distinguish multiple cases.
 530  */
 531
 532 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
 533 #define __generic(expr, t, yes, no)                                     \
 534         _Generic(expr, t: yes, default: no)
 535 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
 536 #define __generic(expr, t, yes, no)                                     \
 537         __builtin_choose_expr(                                          \
 538             __builtin_types_compatible_p(__typeof(expr), t), yes, no)
 539 #endif
 540
 541 /*-
 542  * POSIX.1 requires that the macros we test be defined before any standard
 543  * header file is included.
 544  *
 545  * Here's a quick run-down of the versions:
 546  *  defined(_POSIX_SOURCE)              1003.1-1988
 547  *  _POSIX_C_SOURCE == 1                1003.1-1990
 548  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
 549  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
 550  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
 551  *                                      and the omnibus ISO/IEC 9945-1: 1996
 552  *  _POSIX_C_SOURCE == 200112           1003.1-2001
 553  *  _POSIX_C_SOURCE == 200809           1003.1-2008
 554  *
 555  * In addition, the X/Open Portability Guide, which is now the Single UNIX
 556  * Specification, defines a feature-test macro which indicates the version of
 557  * that specification, and which subsumes _POSIX_C_SOURCE.
 558  *
 559  * Our macros begin with two underscores to avoid namespace screwage.
 560  */
 561
 562 /*
 563  * If no special macro was specified, make the DragonFly extensions
 564  * available. Also make them available when requested so.
 565  */
 566 #if (!defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE) && \
 567     !defined(_ANSI_SOURCE) && !defined(_C99_SOURCE)) || \
 568     defined(_DRAGONFLY_SOURCE) || defined(_NETBSD_SOURCE)
 569 #define __DF_VISIBLE    1
 570 #else
 571 #define __DF_VISIBLE    0
 572 #endif
 573
 574 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
 575 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 1
 576 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
 577 #define _POSIX_C_SOURCE         199009
 578 #endif
 579
 580 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
 581 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 2
 582 #undef _POSIX_C_SOURCE
 583 #define _POSIX_C_SOURCE         199209
 584 #endif
 585
 586 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
 587 #ifdef _XOPEN_SOURCE
 588 #if _XOPEN_SOURCE - 0 >= 700
 589 #define __XSI_VISIBLE           700
 590 #undef _POSIX_C_SOURCE
 591 #define _POSIX_C_SOURCE         200809
 592 #elif _XOPEN_SOURCE - 0 >= 600
 593 #define __XSI_VISIBLE           600
 594 #undef _POSIX_C_SOURCE
 595 #define _POSIX_C_SOURCE         200112
 596 #elif _XOPEN_SOURCE - 0 >= 500
 597 #define __XSI_VISIBLE           500
 598 #undef _POSIX_C_SOURCE
 599 #define _POSIX_C_SOURCE         199506
 600 #endif
 601 #endif
 602
 603 /*
 604  * Deal with all versions of POSIX.  The ordering relative to the tests above is
 605  * important.
 606  */
 607 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
 608 #define _POSIX_C_SOURCE         198808
 609 #endif
 610 #ifdef _POSIX_C_SOURCE
 611 #if (_POSIX_C_SOURCE - 0) >= 200809
 612 #define __POSIX_VISIBLE         200809
 613 #define __ISO_C_VISIBLE         1999
 614 #elif (_POSIX_C_SOURCE - 0) >= 200112
 615 #define __POSIX_VISIBLE         200112
 616 #define __ISO_C_VISIBLE         1999
 617 #elif (_POSIX_C_SOURCE - 0) >= 199506
 618 #define __POSIX_VISIBLE         199506
 619 #define __ISO_C_VISIBLE         1990
 620 #elif (_POSIX_C_SOURCE - 0) >= 199309
 621 #define __POSIX_VISIBLE         199309
 622 #define __ISO_C_VISIBLE         1990
 623 #elif (_POSIX_C_SOURCE - 0) >= 199209
 624 #define __POSIX_VISIBLE         199209
 625 #define __ISO_C_VISIBLE         1990
 626 #elif (_POSIX_C_SOURCE - 0) >= 199009
 627 #define __POSIX_VISIBLE         199009
 628 #define __ISO_C_VISIBLE         1990
 629 #else
 630 #define __POSIX_VISIBLE         198808
 631 #define __ISO_C_VISIBLE         0
 632 #endif /* _POSIX_C_SOURCE */
 633 #else
 634 /*-
 635  * Deal with _ANSI_SOURCE:
 636  * If it is defined, and no other compilation environment is explicitly
 637  * requested, then define our internal feature-test macros to zero.  This
 638  * makes no difference to the preprocessor (undefined symbols in preprocessing
 639  * expressions are defined to have value zero), but makes it more convenient for
 640  * a test program to print out the values.
 641  *
 642  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
 643  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
 644  * environment (and in fact we will never get here).
 645  */
 646 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
 647 #define __POSIX_VISIBLE         0
 648 #define __XSI_VISIBLE           0
 649 #define __BSD_VISIBLE           0
 650 #define __ISO_C_VISIBLE         1990
 651 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
 652 #define __POSIX_VISIBLE         0
 653 #define __XSI_VISIBLE           0
 654 #define __BSD_VISIBLE           0
 655 #define __ISO_C_VISIBLE         1999
 656 #elif defined(_C11_SOURCE)      /* Localism to specify strict C11 env. */
 657 #define __POSIX_VISIBLE         0
 658 #define __XSI_VISIBLE           0
 659 #define __BSD_VISIBLE           0
 660 #define __ISO_C_VISIBLE         2011
 661 #else                           /* Default environment: show everything. */
 662 #define __POSIX_VISIBLE         200809
 663 #define __XSI_VISIBLE           700
 664 #define __BSD_VISIBLE           1
 665 #define __ISO_C_VISIBLE         2011
 666 #endif
 667 #endif
 668
 669 /*
 670  * GLOBL macro exists to preserve __start_set_* and __stop_set_* sections
 671  * of kernel modules which are discarded from binutils 2.17.50+ otherwise.
 672  */
 673
 674 #define __GLOBL1(sym)   __asm__(".globl " #sym)
 675 #define __GLOBL(sym)    __GLOBL1(sym)
 676
 677 #endif /* !_SYS_CDEFS_H_ */