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