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