bsd/sys/cdefs.h

   1 /*
   2  * Copyright (c) 2000-2018 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /* Copyright 1995 NeXT Computer, Inc. All rights reserved. */
  29 /*
  30  * Copyright (c) 1991, 1993
  31  *      The Regents of the University of California.  All rights reserved.
  32  *
  33  * This code is derived from software contributed to Berkeley by
  34  * Berkeley Software Design, Inc.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  * 3. All advertising materials mentioning features or use of this software
  45  *    must display the following acknowledgement:
  46  *      This product includes software developed by the University of
  47  *      California, Berkeley and its contributors.
  48  * 4. Neither the name of the University nor the names of its contributors
  49  *    may be used to endorse or promote products derived from this software
  50  *    without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  53  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  54  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  56  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  62  * SUCH DAMAGE.
  63  *
  64  *      @(#)cdefs.h     8.8 (Berkeley) 1/9/95
  65  */
  66
  67 #ifndef _CDEFS_H_
  68 #define _CDEFS_H_
  69
  70 #if defined(__cplusplus)
  71 #define __BEGIN_DECLS   extern "C" {
  72 #define __END_DECLS     }
  73 #else
  74 #define __BEGIN_DECLS
  75 #define __END_DECLS
  76 #endif
  77
  78 /* This SDK is designed to work with clang and specific versions of
  79  * gcc >= 4.0 with Apple's patch sets */
  80 #if !defined(__GNUC__) || __GNUC__ < 4
  81 #warning "Unsupported compiler detected"
  82 #endif
  83
  84 /*
  85  * Compatibility with compilers and environments that don't support compiler
  86  * feature checking function-like macros.
  87  */
  88 #ifndef __has_builtin
  89 #define __has_builtin(x) 0
  90 #endif
  91 #ifndef __has_include
  92 #define __has_include(x) 0
  93 #endif
  94 #ifndef __has_feature
  95 #define __has_feature(x) 0
  96 #endif
  97 #ifndef __has_attribute
  98 #define __has_attribute(x) 0
  99 #endif
 100 #ifndef __has_extension
 101 #define __has_extension(x) 0
 102 #endif
 103
 104 /*
 105  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
 106  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
 107  * The __CONCAT macro is a bit tricky -- make sure you don't put spaces
 108  * in between its arguments.  __CONCAT can also concatenate double-quoted
 109  * strings produced by the __STRING macro, but this only works with ANSI C.
 110  */
 111 #if defined(__STDC__) || defined(__cplusplus)
 112 #define __P(protos)     protos          /* full-blown ANSI C */
 113 #define __CONCAT(x, y)   x ## y
 114 #define __STRING(x)     #x
 115
 116 #define __const         const           /* define reserved names to standard */
 117 #define __signed        signed
 118 #define __volatile      volatile
 119 #if defined(__cplusplus)
 120 #define __inline        inline          /* convert to C++ keyword */
 121 #else
 122 #ifndef __GNUC__
 123 #define __inline                        /* delete GCC keyword */
 124 #endif /* !__GNUC__ */
 125 #endif /* !__cplusplus */
 126
 127 #else   /* !(__STDC__ || __cplusplus) */
 128 #define __P(protos)     ()              /* traditional C preprocessor */
 129 #define __CONCAT(x, y)   x /**/ y
 130 #define __STRING(x)     "x"
 131
 132 #ifndef __GNUC__
 133 #define __const                         /* delete pseudo-ANSI C keywords */
 134 #define __inline
 135 #define __signed
 136 #define __volatile
 137 #endif  /* !__GNUC__ */
 138
 139 /*
 140  * In non-ANSI C environments, new programs will want ANSI-only C keywords
 141  * deleted from the program and old programs will want them left alone.
 142  * When using a compiler other than gcc, programs using the ANSI C keywords
 143  * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
 144  * When using "gcc -traditional", we assume that this is the intent; if
 145  * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
 146  */
 147 #ifndef NO_ANSI_KEYWORDS
 148 #define const           __const                 /* convert ANSI C keywords */
 149 #define inline          __inline
 150 #define signed          __signed
 151 #define volatile        __volatile
 152 #endif /* !NO_ANSI_KEYWORDS */
 153 #endif /* !(__STDC__ || __cplusplus) */
 154
 155 #define __dead2         __attribute__((__noreturn__))
 156 #define __pure2         __attribute__((__const__))
 157
 158 /* __unused denotes variables and functions that may not be used, preventing
 159  * the compiler from warning about it if not used.
 160  */
 161 #define __unused        __attribute__((__unused__))
 162
 163 /* __used forces variables and functions to be included even if it appears
 164  * to the compiler that they are not used (and would thust be discarded).
 165  */
 166 #define __used          __attribute__((__used__))
 167
 168 /* __cold marks code used for debugging or that is rarely taken
 169  * and tells the compiler to optimize for size and outline code.
 170  */
 171 #if __has_attribute(cold)
 172 #define __cold          __attribute__((__cold__))
 173 #else
 174 #define __cold
 175 #endif
 176
 177 /* __deprecated causes the compiler to produce a warning when encountering
 178  * code using the deprecated functionality.
 179  * __deprecated_msg() does the same, and compilers that support it will print
 180  * a message along with the deprecation warning.
 181  * This may require turning on such warning with the -Wdeprecated flag.
 182  * __deprecated_enum_msg() should be used on enums, and compilers that support
 183  * it will print the deprecation warning.
 184  * __kpi_deprecated() specifically indicates deprecation of kernel programming
 185  * interfaces in Kernel.framework used by KEXTs.
 186  */
 187 #define __deprecated    __attribute__((__deprecated__))
 188
 189 #if __has_extension(attribute_deprecated_with_message) || \
 190         (defined(__GNUC__) && ((__GNUC__ >= 5) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 5))))
 191         #define __deprecated_msg(_msg) __attribute__((__deprecated__(_msg)))
 192 #else
 193         #define __deprecated_msg(_msg) __attribute__((__deprecated__))
 194 #endif
 195
 196 #if __has_extension(enumerator_attributes)
 197         #define __deprecated_enum_msg(_msg) __deprecated_msg(_msg)
 198 #else
 199         #define __deprecated_enum_msg(_msg)
 200 #endif
 201
 202 #if defined(KERNEL) && !defined(KERNEL_PRIVATE)
 203 #define __kpi_deprecated(_msg) __deprecated_msg(_msg)
 204 #else /* !defined(KERNEL) || defined(KERNEL_PRIVATE) */
 205 #define __kpi_deprecated(_msg)
 206 #endif /* !defined(KERNEL) || defined(KERNEL_PRIVATE) */
 207
 208 /* __unavailable causes the compiler to error out when encountering
 209  * code using the tagged function of variable.
 210  */
 211 #define __unavailable   __attribute__((__unavailable__))
 212
 213 /* Delete pseudo-keywords wherever they are not available or needed. */
 214 #ifndef __dead
 215 #define __dead
 216 #define __pure
 217 #endif
 218
 219 /*
 220  * We use `__restrict' as a way to define the `restrict' type qualifier
 221  * without disturbing older software that is unaware of C99 keywords.
 222  */
 223 #if __STDC_VERSION__ < 199901
 224 #define __restrict
 225 #else
 226 #define __restrict      restrict
 227 #endif
 228
 229 /* Compatibility with compilers and environments that don't support the
 230  * nullability feature.
 231  */
 232
 233 #if !__has_feature(nullability)
 234 #ifndef __nullable
 235 #define __nullable
 236 #endif
 237 #ifndef __nonnull
 238 #define __nonnull
 239 #endif
 240 #ifndef __null_unspecified
 241 #define __null_unspecified
 242 #endif
 243 #ifndef _Nullable
 244 #define _Nullable
 245 #endif
 246 #ifndef _Nonnull
 247 #define _Nonnull
 248 #endif
 249 #ifndef _Null_unspecified
 250 #define _Null_unspecified
 251 #endif
 252 #endif
 253
 254 /*
 255  * __disable_tail_calls causes the compiler to not perform tail call
 256  * optimization inside the marked function.
 257  */
 258 #if __has_attribute(disable_tail_calls)
 259 #define __disable_tail_calls    __attribute__((__disable_tail_calls__))
 260 #else
 261 #define __disable_tail_calls
 262 #endif
 263
 264 /*
 265  * __not_tail_called causes the compiler to prevent tail call optimization
 266  * on statically bound calls to the function.  It has no effect on indirect
 267  * calls.  Virtual functions, objective-c methods, and functions marked as
 268  * "always_inline" cannot be marked as __not_tail_called.
 269  */
 270 #if __has_attribute(not_tail_called)
 271 #define __not_tail_called       __attribute__((__not_tail_called__))
 272 #else
 273 #define __not_tail_called
 274 #endif
 275
 276 /*
 277  * __result_use_check warns callers of a function that not using the function
 278  * return value is a bug, i.e. dismissing malloc() return value results in a
 279  * memory leak.
 280  */
 281 #if __has_attribute(warn_unused_result)
 282 #define __result_use_check __attribute__((__warn_unused_result__))
 283 #else
 284 #define __result_use_check
 285 #endif
 286
 287 /*
 288  * __swift_unavailable causes the compiler to mark a symbol as specifically
 289  * unavailable in Swift, regardless of any other availability in C.
 290  */
 291 #if __has_feature(attribute_availability_swift)
 292 #define __swift_unavailable(_msg)       __attribute__((__availability__(swift, unavailable, message=_msg)))
 293 #else
 294 #define __swift_unavailable(_msg)
 295 #endif
 296
 297 /*
 298  * __abortlike is the attribute to put on functions like abort() that are
 299  * typically used to mark assertions. These optimize the codegen
 300  * for outlining while still maintaining debugability.
 301  */
 302 #ifndef __abortlike
 303 #define __abortlike __dead2 __cold __not_tail_called
 304 #endif
 305
 306 /* Declaring inline functions within headers is error-prone due to differences
 307  * across various versions of the C language and extensions.  __header_inline
 308  * can be used to declare inline functions within system headers.  In cases
 309  * where you want to force inlining instead of letting the compiler make
 310  * the decision, you can use __header_always_inline.
 311  *
 312  * Be aware that using inline for functions which compilers may also provide
 313  * builtins can behave differently under various compilers.  If you intend to
 314  * provide an inline version of such a function, you may want to use a macro
 315  * instead.
 316  *
 317  * The check for !__GNUC__ || __clang__ is because gcc doesn't correctly
 318  * support c99 inline in some cases:
 319  * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55965
 320  */
 321
 322 #if defined(__cplusplus) || \
 323         (__STDC_VERSION__ >= 199901L && \
 324         !defined(__GNUC_GNU_INLINE__) && \
 325         (!defined(__GNUC__) || defined(__clang__)))
 326 # define __header_inline           inline
 327 #elif defined(__GNUC__) && defined(__GNUC_STDC_INLINE__)
 328 # define __header_inline           extern __inline __attribute__((__gnu_inline__))
 329 #elif defined(__GNUC__)
 330 # define __header_inline           extern __inline
 331 #else
 332 /* If we land here, we've encountered an unsupported compiler,
 333  * so hopefully it understands static __inline as a fallback.
 334  */
 335 # define __header_inline           static __inline
 336 #endif
 337
 338 #ifdef __GNUC__
 339 # define __header_always_inline    __header_inline __attribute__ ((__always_inline__))
 340 #else
 341 /* Unfortunately, we're using a compiler that we don't know how to force to
 342  * inline.  Oh well.
 343  */
 344 # define __header_always_inline    __header_inline
 345 #endif
 346
 347 /*
 348  * Compiler-dependent macros that bracket portions of code where the
 349  * "-Wunreachable-code" warning should be ignored. Please use sparingly.
 350  */
 351 #if defined(__clang__)
 352 # define __unreachable_ok_push \
 353          _Pragma("clang diagnostic push") \
 354          _Pragma("clang diagnostic ignored \"-Wunreachable-code\"")
 355 # define __unreachable_ok_pop \
 356          _Pragma("clang diagnostic pop")
 357 #elif defined(__GNUC__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
 358 # define __unreachable_ok_push \
 359          _Pragma("GCC diagnostic push") \
 360          _Pragma("GCC diagnostic ignored \"-Wunreachable-code\"")
 361 # define __unreachable_ok_pop \
 362          _Pragma("GCC diagnostic pop")
 363 #else
 364 # define __unreachable_ok_push
 365 # define __unreachable_ok_pop
 366 #endif
 367
 368 /*
 369  * Compiler-dependent macros to declare that functions take printf-like
 370  * or scanf-like arguments.  They are null except for versions of gcc
 371  * that are known to support the features properly.  Functions declared
 372  * with these attributes will cause compilation warnings if there is a
 373  * mismatch between the format string and subsequent function parameter
 374  * types.
 375  */
 376 #define __printflike(fmtarg, firstvararg) \
 377                 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
 378 #define __printf0like(fmtarg, firstvararg) \
 379                 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
 380 #define __scanflike(fmtarg, firstvararg) \
 381                 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
 382
 383 #define __IDSTRING(name, string) static const char name[] __used = string
 384
 385 #ifndef __COPYRIGHT
 386 #define __COPYRIGHT(s) __IDSTRING(copyright,s)
 387 #endif
 388
 389 #ifndef __RCSID
 390 #define __RCSID(s) __IDSTRING(rcsid,s)
 391 #endif
 392
 393 #ifndef __SCCSID
 394 #define __SCCSID(s) __IDSTRING(sccsid,s)
 395 #endif
 396
 397 #ifndef __PROJECT_VERSION
 398 #define __PROJECT_VERSION(s) __IDSTRING(project_version,s)
 399 #endif
 400
 401 /* Source compatibility only, ID string not emitted in object file */
 402 #ifndef __FBSDID
 403 #define __FBSDID(s)
 404 #endif
 405
 406 #ifndef __DECONST
 407 #define __DECONST(type, var)    __CAST_AWAY_QUALIFIER(var, const, type)
 408 #endif
 409
 410 #ifndef __DEVOLATILE
 411 #define __DEVOLATILE(type, var) __CAST_AWAY_QUALIFIER(var, volatile, type)
 412 #endif
 413
 414 #ifndef __DEQUALIFY
 415 #define __DEQUALIFY(type, var)  __CAST_AWAY_QUALIFIER(var, const volatile, type)
 416 #endif
 417
 418 /*
 419  * __alloc_size can be used to label function arguments that represent the
 420  * size of memory that the function allocates and returns. The one-argument
 421  * form labels a single argument that gives the allocation size (where the
 422  * arguments are numbered from 1):
 423  *
 424  * void *malloc(size_t __size) __alloc_size(1);
 425  *
 426  * The two-argument form handles the case where the size is calculated as the
 427  * product of two arguments:
 428  *
 429  * void *calloc(size_t __count, size_t __size) __alloc_size(1,2);
 430  */
 431 #ifndef __alloc_size
 432 #if __has_attribute(alloc_size)
 433 #define __alloc_size(...) __attribute__((alloc_size(__VA_ARGS__)))
 434 #else
 435 #define __alloc_size(...)
 436 #endif
 437 #endif // __alloc_size
 438
 439 /*
 440  * COMPILATION ENVIRONMENTS -- see compat(5) for additional detail
 441  *
 442  * DEFAULT      By default newly complied code will get POSIX APIs plus
 443  *              Apple API extensions in scope.
 444  *
 445  *              Most users will use this compilation environment to avoid
 446  *              behavioral differences between 32 and 64 bit code.
 447  *
 448  * LEGACY       Defining _NONSTD_SOURCE will get pre-POSIX APIs plus Apple
 449  *              API extensions in scope.
 450  *
 451  *              This is generally equivalent to the Tiger release compilation
 452  *              environment, except that it cannot be applied to 64 bit code;
 453  *              its use is discouraged.
 454  *
 455  *              We expect this environment to be deprecated in the future.
 456  *
 457  * STRICT       Defining _POSIX_C_SOURCE or _XOPEN_SOURCE restricts the
 458  *              available APIs to exactly the set of APIs defined by the
 459  *              corresponding standard, based on the value defined.
 460  *
 461  *              A correct, portable definition for _POSIX_C_SOURCE is 200112L.
 462  *              A correct, portable definition for _XOPEN_SOURCE is 600L.
 463  *
 464  *              Apple API extensions are not visible in this environment,
 465  *              which can cause Apple specific code to fail to compile,
 466  *              or behave incorrectly if prototypes are not in scope or
 467  *              warnings about missing prototypes are not enabled or ignored.
 468  *
 469  * In any compilation environment, for correct symbol resolution to occur,
 470  * function prototypes must be in scope.  It is recommended that all Apple
 471  * tools users add either the "-Wall" or "-Wimplicit-function-declaration"
 472  * compiler flags to their projects to be warned when a function is being
 473  * used without a prototype in scope.
 474  */
 475
 476 /* These settings are particular to each product. */
 477 #ifdef KERNEL
 478 #define __DARWIN_ONLY_64_BIT_INO_T      0
 479 #define __DARWIN_ONLY_UNIX_CONFORMANCE  0
 480 #define __DARWIN_ONLY_VERS_1050         0
 481 #if defined(__x86_64__)
 482 #define __DARWIN_SUF_DARWIN14   "_darwin14"
 483 #define __DARWIN14_ALIAS(sym)   __asm("_" __STRING(sym) __DARWIN_SUF_DARWIN14)
 484 #else
 485 #define __DARWIN14_ALIAS(sym)
 486 #endif
 487 #else /* !KERNEL */
 488 #ifdef PLATFORM_iPhoneOS
 489 /* Platform: iPhoneOS */
 490 #define __DARWIN_ONLY_64_BIT_INO_T      1
 491 #define __DARWIN_ONLY_UNIX_CONFORMANCE  1
 492 #define __DARWIN_ONLY_VERS_1050         1
 493 #endif /* PLATFORM_iPhoneOS */
 494 #ifdef PLATFORM_iPhoneSimulator
 495 /* Platform: iPhoneSimulator */
 496 #define __DARWIN_ONLY_64_BIT_INO_T      1
 497 #define __DARWIN_ONLY_UNIX_CONFORMANCE  1
 498 #define __DARWIN_ONLY_VERS_1050         1
 499 #endif /* PLATFORM_iPhoneSimulator */
 500 #ifdef PLATFORM_tvOS
 501 /* Platform: tvOS */
 502 #define __DARWIN_ONLY_64_BIT_INO_T      1
 503 #define __DARWIN_ONLY_UNIX_CONFORMANCE  1
 504 #define __DARWIN_ONLY_VERS_1050         1
 505 #endif /* PLATFORM_tvOS */
 506 #ifdef PLATFORM_AppleTVOS
 507 /* Platform: AppleTVOS */
 508 #define __DARWIN_ONLY_64_BIT_INO_T      1
 509 #define __DARWIN_ONLY_UNIX_CONFORMANCE  1
 510 #define __DARWIN_ONLY_VERS_1050         1
 511 #endif /* PLATFORM_AppleTVOS */
 512 #ifdef PLATFORM_tvSimulator
 513 /* Platform: tvSimulator */
 514 #define __DARWIN_ONLY_64_BIT_INO_T      1
 515 #define __DARWIN_ONLY_UNIX_CONFORMANCE  1
 516 #define __DARWIN_ONLY_VERS_1050         1
 517 #endif /* PLATFORM_tvSimulator */
 518 #ifdef PLATFORM_AppleTVSimulator
 519 /* Platform: AppleTVSimulator */
 520 #define __DARWIN_ONLY_64_BIT_INO_T      1
 521 #define __DARWIN_ONLY_UNIX_CONFORMANCE  1
 522 #define __DARWIN_ONLY_VERS_1050         1
 523 #endif /* PLATFORM_AppleTVSimulator */
 524 #ifdef PLATFORM_iPhoneOSNano
 525 /* Platform: iPhoneOSNano */
 526 #define __DARWIN_ONLY_64_BIT_INO_T      1
 527 #define __DARWIN_ONLY_UNIX_CONFORMANCE  1
 528 #define __DARWIN_ONLY_VERS_1050         1
 529 #endif /* PLATFORM_iPhoneOSNano */
 530 #ifdef PLATFORM_iPhoneNanoSimulator
 531 /* Platform: iPhoneNanoSimulator */
 532 #define __DARWIN_ONLY_64_BIT_INO_T      1
 533 #define __DARWIN_ONLY_UNIX_CONFORMANCE  1
 534 #define __DARWIN_ONLY_VERS_1050         1
 535 #endif /* PLATFORM_iPhoneNanoSimulator */
 536 #ifdef PLATFORM_WatchOS
 537 /* Platform: WatchOS */
 538 #define __DARWIN_ONLY_64_BIT_INO_T      1
 539 #define __DARWIN_ONLY_UNIX_CONFORMANCE  1
 540 #define __DARWIN_ONLY_VERS_1050         1
 541 #endif /* PLATFORM_WatchOS */
 542 #ifdef PLATFORM_WatchSimulator
 543 /* Platform: WatchSimulator */
 544 #define __DARWIN_ONLY_64_BIT_INO_T      1
 545 #define __DARWIN_ONLY_UNIX_CONFORMANCE  1
 546 #define __DARWIN_ONLY_VERS_1050         1
 547 #endif /* PLATFORM_WatchSimulator */
 548 #ifdef PLATFORM_BridgeOS
 549 /* Platform: BridgeOS */
 550 #define __DARWIN_ONLY_64_BIT_INO_T      1
 551 #define __DARWIN_ONLY_UNIX_CONFORMANCE  1
 552 #define __DARWIN_ONLY_VERS_1050         1
 553 #endif /* PLATFORM_BridgeOS */
 554 #ifdef PLATFORM_DriverKit
 555 /* Platform: DriverKit */
 556 #define __DARWIN_ONLY_64_BIT_INO_T      1
 557 #define __DARWIN_ONLY_UNIX_CONFORMANCE  1
 558 #define __DARWIN_ONLY_VERS_1050         1
 559 #endif /* PLATFORM_DriverKit */
 560 #ifdef PLATFORM_MacOSX
 561 /* Platform: MacOSX */
 562 #define __DARWIN_ONLY_64_BIT_INO_T      0
 563 /* #undef __DARWIN_ONLY_UNIX_CONFORMANCE (automatically set for 64-bit) */
 564 #define __DARWIN_ONLY_VERS_1050         0
 565 #endif /* PLATFORM_MacOSX */
 566 #endif /* KERNEL */
 567
 568 /*
 569  * The __DARWIN_ALIAS macros are used to do symbol renaming; they allow
 570  * legacy code to use the old symbol, thus maintaining binary compatibility
 571  * while new code can use a standards compliant version of the same function.
 572  *
 573  * __DARWIN_ALIAS is used by itself if the function signature has not
 574  * changed, it is used along with a #ifdef check for __DARWIN_UNIX03
 575  * if the signature has changed.  Because the __LP64__ environment
 576  * only supports UNIX03 semantics it causes __DARWIN_UNIX03 to be
 577  * defined, but causes __DARWIN_ALIAS to do no symbol mangling.
 578  *
 579  * As a special case, when XCode is used to target a specific version of the
 580  * OS, the manifest constant __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
 581  * will be defined by the compiler, with the digits representing major version
 582  * time 100 + minor version times 10 (e.g. 10.5 := 1050).  If we are targeting
 583  * pre-10.5, and it is the default compilation environment, revert the
 584  * compilation environment to pre-__DARWIN_UNIX03.
 585  */
 586 #if !defined(__DARWIN_ONLY_UNIX_CONFORMANCE)
 587 #  if defined(__LP64__)
 588 #    define __DARWIN_ONLY_UNIX_CONFORMANCE 1
 589 #  else /* !__LP64__ */
 590 #    define __DARWIN_ONLY_UNIX_CONFORMANCE 0
 591 #  endif /* __LP64__ */
 592 #endif /* !__DARWIN_ONLY_UNIX_CONFORMANCE */
 593
 594 #if !defined(__DARWIN_UNIX03)
 595 #  if defined(KERNEL)
 596 #    define __DARWIN_UNIX03     0
 597 #  elif __DARWIN_ONLY_UNIX_CONFORMANCE
 598 #    if defined(_NONSTD_SOURCE)
 599 #      error "Can't define _NONSTD_SOURCE when only UNIX conformance is available."
 600 #    endif /* _NONSTD_SOURCE */
 601 #    define __DARWIN_UNIX03     1
 602 #  elif defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && ((__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ - 0) < 1040)
 603 #    define __DARWIN_UNIX03     0
 604 #  elif defined(_DARWIN_C_SOURCE) || defined(_XOPEN_SOURCE) || defined(_POSIX_C_SOURCE)
 605 #    if defined(_NONSTD_SOURCE)
 606 #      error "Can't define both _NONSTD_SOURCE and any of _DARWIN_C_SOURCE, _XOPEN_SOURCE or _POSIX_C_SOURCE."
 607 #    endif /* _NONSTD_SOURCE */
 608 #    define __DARWIN_UNIX03     1
 609 #  elif defined(_NONSTD_SOURCE)
 610 #    define __DARWIN_UNIX03     0
 611 #  else /* default */
 612 #    if defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && ((__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ - 0) < 1050)
 613 #      define __DARWIN_UNIX03   0
 614 #    else /* __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1050 */
 615 #      define __DARWIN_UNIX03   1
 616 #    endif /* __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1050 */
 617 #  endif /* _DARWIN_C_SOURCE || _XOPEN_SOURCE || _POSIX_C_SOURCE || __LP64__ */
 618 #endif /* !__DARWIN_UNIX03 */
 619
 620 #if !defined(__DARWIN_64_BIT_INO_T)
 621 #  if defined(KERNEL)
 622 #    define __DARWIN_64_BIT_INO_T 0
 623 #  elif defined(_DARWIN_USE_64_BIT_INODE)
 624 #    if defined(_DARWIN_NO_64_BIT_INODE)
 625 #      error "Can't define both _DARWIN_USE_64_BIT_INODE and _DARWIN_NO_64_BIT_INODE."
 626 #    endif /* _DARWIN_NO_64_BIT_INODE */
 627 #    define __DARWIN_64_BIT_INO_T 1
 628 #  elif defined(_DARWIN_NO_64_BIT_INODE)
 629 #    if __DARWIN_ONLY_64_BIT_INO_T
 630 #      error "Can't define _DARWIN_NO_64_BIT_INODE when only 64-bit inodes are available."
 631 #    endif /* __DARWIN_ONLY_64_BIT_INO_T */
 632 #    define __DARWIN_64_BIT_INO_T 0
 633 #  else /* default */
 634 #    if __DARWIN_ONLY_64_BIT_INO_T
 635 #      define __DARWIN_64_BIT_INO_T 1
 636 #    elif defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && ((__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ - 0) < 1060) || __DARWIN_UNIX03 == 0
 637 #      define __DARWIN_64_BIT_INO_T 0
 638 #    else /* default */
 639 #      define __DARWIN_64_BIT_INO_T 1
 640 #    endif /* __DARWIN_ONLY_64_BIT_INO_T */
 641 #  endif
 642 #endif /* !__DARWIN_64_BIT_INO_T */
 643
 644 #if !defined(__DARWIN_VERS_1050)
 645 #  if defined(KERNEL)
 646 #    define __DARWIN_VERS_1050 0
 647 #  elif __DARWIN_ONLY_VERS_1050
 648 #    define __DARWIN_VERS_1050 1
 649 #  elif defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && ((__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ - 0) < 1050) || __DARWIN_UNIX03 == 0
 650 #    define __DARWIN_VERS_1050 0
 651 #  else /* default */
 652 #    define __DARWIN_VERS_1050 1
 653 #  endif
 654 #endif /* !__DARWIN_VERS_1050 */
 655
 656 #if !defined(__DARWIN_NON_CANCELABLE)
 657 #  if defined(KERNEL)
 658 #    define __DARWIN_NON_CANCELABLE 0
 659 #  else /* default */
 660 #    define __DARWIN_NON_CANCELABLE 0
 661 #  endif
 662 #endif /* !__DARWIN_NON_CANCELABLE */
 663
 664 /*
 665  * symbol suffixes used for symbol versioning
 666  */
 667 #if __DARWIN_UNIX03
 668 #  if __DARWIN_ONLY_UNIX_CONFORMANCE
 669 #    define __DARWIN_SUF_UNIX03         /* nothing */
 670 #  else /* !__DARWIN_ONLY_UNIX_CONFORMANCE */
 671 #    define __DARWIN_SUF_UNIX03         "$UNIX2003"
 672 #  endif /* __DARWIN_ONLY_UNIX_CONFORMANCE */
 673
 674 #  if __DARWIN_64_BIT_INO_T
 675 #    if __DARWIN_ONLY_64_BIT_INO_T
 676 #      define __DARWIN_SUF_64_BIT_INO_T /* nothing */
 677 #    else /* !__DARWIN_ONLY_64_BIT_INO_T */
 678 #      define __DARWIN_SUF_64_BIT_INO_T "$INODE64"
 679 #    endif /* __DARWIN_ONLY_64_BIT_INO_T */
 680 #  else /* !__DARWIN_64_BIT_INO_T */
 681 #    define __DARWIN_SUF_64_BIT_INO_T   /* nothing */
 682 #  endif /* __DARWIN_64_BIT_INO_T */
 683
 684 #  if __DARWIN_VERS_1050
 685 #    if __DARWIN_ONLY_VERS_1050
 686 #      define __DARWIN_SUF_1050         /* nothing */
 687 #    else /* !__DARWIN_ONLY_VERS_1050 */
 688 #      define __DARWIN_SUF_1050         "$1050"
 689 #    endif /* __DARWIN_ONLY_VERS_1050 */
 690 #  else /* !__DARWIN_VERS_1050 */
 691 #    define __DARWIN_SUF_1050           /* nothing */
 692 #  endif /* __DARWIN_VERS_1050 */
 693
 694 #  if __DARWIN_NON_CANCELABLE
 695 #    define __DARWIN_SUF_NON_CANCELABLE "$NOCANCEL"
 696 #  else /* !__DARWIN_NON_CANCELABLE */
 697 #    define __DARWIN_SUF_NON_CANCELABLE /* nothing */
 698 #  endif /* __DARWIN_NON_CANCELABLE */
 699
 700 #else /* !__DARWIN_UNIX03 */
 701 #  define __DARWIN_SUF_UNIX03           /* nothing */
 702 #  define __DARWIN_SUF_64_BIT_INO_T     /* nothing */
 703 #  define __DARWIN_SUF_NON_CANCELABLE   /* nothing */
 704 #  define __DARWIN_SUF_1050             /* nothing */
 705 #endif /* __DARWIN_UNIX03 */
 706
 707 #define __DARWIN_SUF_EXTSN              "$DARWIN_EXTSN"
 708
 709 /*
 710  * symbol versioning macros
 711  */
 712 #define __DARWIN_ALIAS(sym)             __asm("_" __STRING(sym) __DARWIN_SUF_UNIX03)
 713 #define __DARWIN_ALIAS_C(sym)           __asm("_" __STRING(sym) __DARWIN_SUF_NON_CANCELABLE __DARWIN_SUF_UNIX03)
 714 #define __DARWIN_ALIAS_I(sym)           __asm("_" __STRING(sym) __DARWIN_SUF_64_BIT_INO_T __DARWIN_SUF_UNIX03)
 715 #define __DARWIN_NOCANCEL(sym)          __asm("_" __STRING(sym) __DARWIN_SUF_NON_CANCELABLE)
 716 #define __DARWIN_INODE64(sym)           __asm("_" __STRING(sym) __DARWIN_SUF_64_BIT_INO_T)
 717
 718 #define __DARWIN_1050(sym)              __asm("_" __STRING(sym) __DARWIN_SUF_1050)
 719 #define __DARWIN_1050ALIAS(sym)         __asm("_" __STRING(sym) __DARWIN_SUF_1050 __DARWIN_SUF_UNIX03)
 720 #define __DARWIN_1050ALIAS_C(sym)       __asm("_" __STRING(sym) __DARWIN_SUF_1050 __DARWIN_SUF_NON_CANCELABLE __DARWIN_SUF_UNIX03)
 721 #define __DARWIN_1050ALIAS_I(sym)       __asm("_" __STRING(sym) __DARWIN_SUF_1050 __DARWIN_SUF_64_BIT_INO_T __DARWIN_SUF_UNIX03)
 722 #define __DARWIN_1050INODE64(sym)       __asm("_" __STRING(sym) __DARWIN_SUF_1050 __DARWIN_SUF_64_BIT_INO_T)
 723
 724 #define __DARWIN_EXTSN(sym)             __asm("_" __STRING(sym) __DARWIN_SUF_EXTSN)
 725 #define __DARWIN_EXTSN_C(sym)           __asm("_" __STRING(sym) __DARWIN_SUF_EXTSN __DARWIN_SUF_NON_CANCELABLE)
 726 #if XNU_KERNEL_PRIVATE
 727 #define __XNU_INTERNAL(sym)             __asm("_" __STRING(sym) "$XNU_INTERNAL")
 728 #endif
 729
 730 /*
 731  * symbol release macros
 732  */
 733 #ifdef KERNEL
 734 #define __DARWIN_ALIAS_STARTING(_mac, _iphone, x)
 735 #else
 736 #include <sys/_symbol_aliasing.h>
 737
 738 #if defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__)
 739 #define __DARWIN_ALIAS_STARTING(_mac, _iphone, x)   __DARWIN_ALIAS_STARTING_IPHONE_##_iphone(x)
 740 #elif defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)
 741 #define __DARWIN_ALIAS_STARTING(_mac, _iphone, x)   __DARWIN_ALIAS_STARTING_MAC_##_mac(x)
 742 #else
 743 #define __DARWIN_ALIAS_STARTING(_mac, _iphone, x)   x
 744 #endif
 745 #endif /* KERNEL */
 746
 747
 748 /*
 749  * POSIX.1 requires that the macros we test be defined before any standard
 750  * header file is included.  This permits us to convert values for feature
 751  * testing, as necessary, using only _POSIX_C_SOURCE.
 752  *
 753  * Here's a quick run-down of the versions:
 754  *  defined(_POSIX_SOURCE)              1003.1-1988
 755  *  _POSIX_C_SOURCE == 1L               1003.1-1990
 756  *  _POSIX_C_SOURCE == 2L               1003.2-1992 C Language Binding Option
 757  *  _POSIX_C_SOURCE == 199309L          1003.1b-1993
 758  *  _POSIX_C_SOURCE == 199506L          1003.1c-1995, 1003.1i-1995,
 759  *                                      and the omnibus ISO/IEC 9945-1: 1996
 760  *  _POSIX_C_SOURCE == 200112L          1003.1-2001
 761  *  _POSIX_C_SOURCE == 200809L          1003.1-2008
 762  *
 763  * In addition, the X/Open Portability Guide, which is now the Single UNIX
 764  * Specification, defines a feature-test macro which indicates the version of
 765  * that specification, and which subsumes _POSIX_C_SOURCE.
 766  */
 767
 768 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1L. */
 769 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1L
 770 #undef _POSIX_C_SOURCE
 771 #define _POSIX_C_SOURCE         199009L
 772 #endif
 773
 774 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2L. */
 775 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2L
 776 #undef _POSIX_C_SOURCE
 777 #define _POSIX_C_SOURCE         199209L
 778 #endif
 779
 780 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
 781 #ifdef _XOPEN_SOURCE
 782 #if _XOPEN_SOURCE - 0L >= 700L && (!defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE - 0L < 200809L)
 783 #undef _POSIX_C_SOURCE
 784 #define _POSIX_C_SOURCE         200809L
 785 #elif _XOPEN_SOURCE - 0L >= 600L && (!defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE - 0L < 200112L)
 786 #undef _POSIX_C_SOURCE
 787 #define _POSIX_C_SOURCE         200112L
 788 #elif _XOPEN_SOURCE - 0L >= 500L && (!defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE - 0L < 199506L)
 789 #undef _POSIX_C_SOURCE
 790 #define _POSIX_C_SOURCE         199506L
 791 #endif
 792 #endif
 793
 794 /*
 795  * Deal with all versions of POSIX.  The ordering relative to the tests above is
 796  * important.
 797  */
 798 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
 799 #define _POSIX_C_SOURCE         198808L
 800 #endif
 801
 802 /* POSIX C deprecation macros */
 803 #ifdef KERNEL
 804 #define __POSIX_C_DEPRECATED(ver)
 805 #else
 806 #include <sys/_posix_availability.h>
 807
 808 #define __POSIX_C_DEPRECATED(ver) ___POSIX_C_DEPRECATED_STARTING_##ver
 809 #endif
 810
 811 /*
 812  * Set a single macro which will always be defined and can be used to determine
 813  * the appropriate namespace.  For POSIX, these values will correspond to
 814  * _POSIX_C_SOURCE value.  Currently there are two additional levels corresponding
 815  * to ANSI (_ANSI_SOURCE) and Darwin extensions (_DARWIN_C_SOURCE)
 816  */
 817 #define __DARWIN_C_ANSI         010000L
 818 #define __DARWIN_C_FULL         900000L
 819
 820 #if   defined(_ANSI_SOURCE)
 821 #define __DARWIN_C_LEVEL        __DARWIN_C_ANSI
 822 #elif defined(_POSIX_C_SOURCE) && !defined(_DARWIN_C_SOURCE) && !defined(_NONSTD_SOURCE)
 823 #define __DARWIN_C_LEVEL        _POSIX_C_SOURCE
 824 #else
 825 #define __DARWIN_C_LEVEL        __DARWIN_C_FULL
 826 #endif
 827
 828 /* If the developer has neither requested a strict language mode nor a version
 829  * of POSIX, turn on functionality provided by __STDC_WANT_LIB_EXT1__ as part
 830  * of __DARWIN_C_FULL.
 831  */
 832 #if !defined(__STDC_WANT_LIB_EXT1__) && !defined(__STRICT_ANSI__) && __DARWIN_C_LEVEL >= __DARWIN_C_FULL
 833 #define __STDC_WANT_LIB_EXT1__ 1
 834 #endif
 835
 836 /*
 837  * long long is not supported in c89 (__STRICT_ANSI__), but g++ -ansi and
 838  * c99 still want long longs.  While not perfect, we allow long longs for
 839  * g++.
 840  */
 841 #if (defined(__STRICT_ANSI__) && (__STDC_VERSION__ - 0 < 199901L) && !defined(__GNUG__))
 842 #define __DARWIN_NO_LONG_LONG 1
 843 #else
 844 #define __DARWIN_NO_LONG_LONG 0
 845 #endif
 846
 847 /*****************************************
 848 *  Public darwin-specific feature macros
 849 *****************************************/
 850
 851 /*
 852  * _DARWIN_FEATURE_64_BIT_INODE indicates that the ino_t type is 64-bit, and
 853  * structures modified for 64-bit inodes (like struct stat) will be used.
 854  */
 855 #if __DARWIN_64_BIT_INO_T
 856 #define _DARWIN_FEATURE_64_BIT_INODE            1
 857 #endif
 858
 859 /*
 860  * _DARWIN_FEATURE_64_ONLY_BIT_INODE indicates that the ino_t type may only
 861  * be 64-bit; there is no support for 32-bit ino_t when this macro is defined
 862  * (and non-zero).  There is no struct stat64 either, as the regular
 863  * struct stat will already be the 64-bit version.
 864  */
 865 #if __DARWIN_ONLY_64_BIT_INO_T
 866 #define _DARWIN_FEATURE_ONLY_64_BIT_INODE       1
 867 #endif
 868
 869 /*
 870  * _DARWIN_FEATURE_ONLY_VERS_1050 indicates that only those APIs updated
 871  * in 10.5 exists; no pre-10.5 variants are available.
 872  */
 873 #if __DARWIN_ONLY_VERS_1050
 874 #define _DARWIN_FEATURE_ONLY_VERS_1050          1
 875 #endif
 876
 877 /*
 878  * _DARWIN_FEATURE_ONLY_UNIX_CONFORMANCE indicates only UNIX conforming API
 879  * are available (the legacy BSD APIs are not available)
 880  */
 881 #if __DARWIN_ONLY_UNIX_CONFORMANCE
 882 #define _DARWIN_FEATURE_ONLY_UNIX_CONFORMANCE   1
 883 #endif
 884
 885 /*
 886  * _DARWIN_FEATURE_UNIX_CONFORMANCE indicates whether UNIX conformance is on,
 887  * and specifies the conformance level (3 is SUSv3)
 888  */
 889 #if __DARWIN_UNIX03
 890 #define _DARWIN_FEATURE_UNIX_CONFORMANCE        3
 891 #endif
 892
 893 #if defined(DRIVERKIT) && !defined(KERNEL)
 894 /*
 895  * __DRIVERKIT_LIBC__ indicates to the C++ standard library headers and
 896  * similar components that only the restricted set of standard C library
 897  * functionality and headers for the DriverKit userspace driver environment
 898  * are available.
 899  */
 900 #define __DRIVERKIT_LIBC__                      1
 901 #endif /* defined(DRIVERKIT) && !defined(KERNEL) */
 902
 903 /*
 904  * This macro casts away the qualifier from the variable
 905  *
 906  * Note: use at your own risk, removing qualifiers can result in
 907  * catastrophic run-time failures.
 908  */
 909 #ifndef __CAST_AWAY_QUALIFIER
 910 #define __CAST_AWAY_QUALIFIER(variable, qualifier, type)  (type) (long)(variable)
 911 #endif
 912
 913 /*
 914  * __XNU_PRIVATE_EXTERN is a linkage decoration indicating that a symbol can be
 915  * used from other compilation units, but not other libraries or executables.
 916  */
 917 #ifndef __XNU_PRIVATE_EXTERN
 918 #define __XNU_PRIVATE_EXTERN __attribute__((visibility("hidden")))
 919 #endif
 920
 921 /*
 922  * Architecture validation for current SDK
 923  */
 924 #if !defined(__sys_cdefs_arch_unknown__) && defined(__i386__)
 925 #elif !defined(__sys_cdefs_arch_unknown__) && defined(__x86_64__)
 926 #elif !defined(__sys_cdefs_arch_unknown__) && defined(__arm__)
 927 #elif !defined(__sys_cdefs_arch_unknown__) && defined(__arm64__)
 928 #else
 929 #error Unsupported architecture
 930 #endif
 931
 932 #ifdef XNU_KERNEL_PRIVATE
 933 /*
 934  * Selectively ignore cast alignment warnings
 935  */
 936 #define __IGNORE_WCASTALIGN(x) _Pragma("clang diagnostic push")                     \
 937                                _Pragma("clang diagnostic ignored \"-Wcast-align\"") \
 938                                x;                                                   \
 939                                _Pragma("clang diagnostic pop")
 940 #endif
 941
 942 #if defined(PRIVATE) || defined(KERNEL)
 943 /*
 944  * Check if __probable and __improbable have already been defined elsewhere.
 945  * These macros inform the compiler (and humans) about which branches are likely
 946  * to be taken.
 947  */
 948 #if !defined(__probable) && !defined(__improbable)
 949 #define __probable(x)   __builtin_expect(!!(x), 1)
 950 #define __improbable(x) __builtin_expect(!!(x), 0)
 951 #endif /* !defined(__probable) && !defined(__improbable) */
 952
 953 #if defined(__cplusplus)
 954 #define __container_of(ptr, type, field) __extension__({ \
 955                 const typeof(((type *)nullptr)->field) *__ptr = (ptr); \
 956                 (type *)((uintptr_t)__ptr - offsetof(type, field)); \
 957         })
 958 #else
 959 #define __container_of(ptr, type, field) __extension__({ \
 960                 const typeof(((type *)NULL)->field) *__ptr = (ptr); \
 961                 (type *)((uintptr_t)__ptr - offsetof(type, field)); \
 962         })
 963 #endif
 964
 965 #endif /* KERNEL || PRIVATE */
 966
 967 #define __compiler_barrier() __asm__ __volatile__("" ::: "memory")
 968
 969 #if __has_attribute(enum_extensibility)
 970 #define __enum_open __attribute__((__enum_extensibility__(open)))
 971 #define __enum_closed __attribute__((__enum_extensibility__(closed)))
 972 #else
 973 #define __enum_open
 974 #define __enum_closed
 975 #endif // __has_attribute(enum_extensibility)
 976
 977 #if __has_attribute(flag_enum)
 978 #define __enum_options __attribute__((__flag_enum__))
 979 #else
 980 #define __enum_options
 981 #endif
 982
 983 /*
 984  * Similar to OS_ENUM/OS_CLOSED_ENUM/OS_OPTIONS/OS_CLOSED_OPTIONS
 985  *
 986  * This provides more advanced type checking on compilers supporting
 987  * the proper extensions, even in C.
 988  */
 989 #if __has_feature(objc_fixed_enum) || __has_extension(cxx_fixed_enum) || \
 990         __has_extension(cxx_strong_enums)
 991 #define __enum_decl(_name, _type, ...) \
 992                 typedef enum : _type __VA_ARGS__ __enum_open _name
 993 #define __enum_closed_decl(_name, _type, ...) \
 994                 typedef enum : _type __VA_ARGS__ __enum_closed _name
 995 #define __options_decl(_name, _type, ...) \
 996                 typedef enum : _type __VA_ARGS__ __enum_open __enum_options _name
 997 #define __options_closed_decl(_name, _type, ...) \
 998                 typedef enum : _type __VA_ARGS__ __enum_closed __enum_options _name
 999 #else
1000 #define __enum_decl(_name, _type, ...) \
1001                 typedef _type _name; enum __VA_ARGS__ __enum_open
1002 #define __enum_closed_decl(_name, _type, ...) \
1003                 typedef _type _name; enum __VA_ARGS__ __enum_closed
1004 #define __options_decl(_name, _type, ...) \
1005                 typedef _type _name; enum __VA_ARGS__ __enum_open __enum_options
1006 #define __options_closed_decl(_name, _type, ...) \
1007                 typedef _type _name; enum __VA_ARGS__ __enum_closed __enum_options
1008 #endif
1009
1010 #endif /* !_CDEFS_H_ */