1 /* 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Berkeley Software Design, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)cdefs.h 8.8 (Berkeley) 1/9/95 33 * $FreeBSD: src/sys/sys/cdefs.h,v 1.28.2.8 2002/09/18 04:05:13 mikeh Exp $ 34 */ 35 36 #ifndef _SYS_CDEFS_H_ 37 #define _SYS_CDEFS_H_ 38 39 /* 40 * Testing against Clang-specific extensions. 41 */ 42 #ifndef __has_attribute 43 #define __has_attribute(x) 0 44 #endif 45 #ifndef __has_extension 46 #define __has_extension __has_feature 47 #endif 48 #ifndef __has_feature 49 #define __has_feature(x) 0 50 #endif 51 #ifndef __has_include 52 #define __has_include(x) 0 53 #endif 54 #ifndef __has_builtin 55 #define __has_builtin(x) 0 56 #endif 57 58 /* 59 * Macro to test if we are using a specific version of gcc or later. 60 */ 61 #if defined(__GNUC__) && !defined(__INTEL_COMPILER) 62 #define __GNUC_PREREQ__(ma, mi) \ 63 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi)) 64 #else 65 #define __GNUC_PREREQ__(ma, mi) 0 66 #endif 67 68 #if defined(__cplusplus) 69 #if __GNUC_PREREQ__(4, 0) 70 #define __BEGIN_DECLS _Pragma("GCC visibility push(default)") extern "C" { 71 #define __END_DECLS } _Pragma("GCC visibility pop") 72 #else 73 #define __BEGIN_DECLS extern "C" { 74 #define __END_DECLS } 75 #endif 76 #else 77 #define __BEGIN_DECLS 78 #define __END_DECLS 79 #endif 80 81 /* 82 * The __VM_CACHELINE_SIZE macro defines the common cache line alignment 83 * size that can be found across most recent and somewhat latest Intel 84 * hardware, i.e. L1 cache sizes etc. 85 * 86 * If needed, this value can be TUNED. Suitable values for this macro 87 * are 32, 64 and 128 bytes. The unit of measurement for this macro is 88 * bytes. 89 * 90 * XXX: This macro and related macros will eventually move to a MD 91 * header, but currently, we do need such a hierarchy. 92 */ 93 #define __VM_CACHELINE_SIZE 64 94 #define __VM_CACHELINE_MASK (__VM_CACHELINE_SIZE - 1) 95 #define __VM_CACHELINE_ALIGN(n) \ 96 (((n) + __VM_CACHELINE_MASK) & ~__VM_CACHELINE_MASK) 97 98 /* 99 * The __CONCAT macro is used to concatenate parts of symbol names, e.g. 100 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo. 101 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI 102 * mode -- there must be no spaces between its arguments, and for nested 103 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also 104 * concatenate double-quoted strings produced by the __STRING macro, but 105 * this only works with ANSI C. 106 * 107 * __XSTRING is like __STRING, but it expands any macros in its argument 108 * first. It is only available with ANSI C. 109 */ 110 #if defined(__STDC__) || defined(__cplusplus) 111 #define __P(protos) protos /* full-blown ANSI C */ 112 #define __CONCAT1(x,y) x ## y 113 #define __CONCAT(x,y) __CONCAT1(x,y) 114 #define __STRING(x) #x /* stringify without expanding x */ 115 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */ 116 117 #define __const const /* define reserved names to standard */ 118 #define __signed signed 119 #define __volatile volatile 120 #if defined(__cplusplus) 121 #define __inline inline /* convert to C++ keyword */ 122 #else 123 #ifndef __GNUC__ 124 #define __inline /* delete GCC keyword */ 125 #endif /* !__GNUC__ */ 126 #endif /* !__cplusplus */ 127 128 #else /* !(__STDC__ || __cplusplus) */ 129 #define __P(protos) () /* traditional C preprocessor */ 130 #define __CONCAT(x,y) x/**/y 131 #define __STRING(x) "x" 132 133 #ifndef __GNUC__ 134 #define __const /* delete pseudo-ANSI C keywords */ 135 #define __inline 136 #define __signed 137 #define __volatile 138 /* 139 * In non-ANSI C environments, new programs will want ANSI-only C keywords 140 * deleted from the program and old programs will want them left alone. 141 * When using a compiler other than gcc, programs using the ANSI C keywords 142 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS. 143 * When using "gcc -traditional", we assume that this is the intent; if 144 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone. 145 */ 146 #ifndef NO_ANSI_KEYWORDS 147 #define const /* delete ANSI C keywords */ 148 #define inline 149 #define signed 150 #define volatile 151 #endif /* !NO_ANSI_KEYWORDS */ 152 #endif /* !__GNUC__ */ 153 #endif /* !(__STDC__ || __cplusplus) */ 154 155 /* 156 * Compiler-dependent macros to help declare dead (non-returning) and 157 * pure (no side effects) functions, and unused variables. They are 158 * null except for versions of gcc that are known to support the features 159 * properly (old versions of gcc-2 supported the dead and pure features 160 * in a different (wrong) way). 161 */ 162 #define __weak_symbol __attribute__((__weak__)) 163 #if __GNUC_PREREQ__(2, 7) 164 #define __dead2 __attribute__((__noreturn__)) 165 #define __pure2 __attribute__((__const__)) 166 #define __unused __attribute__((__unused__)) 167 #define __packed __attribute__((__packed__)) 168 #define __aligned(x) __attribute__((__aligned__(x))) 169 #define __section(x) __attribute__((__section__(x))) 170 #define __read_mostly __section(".data.read_mostly") 171 #define __read_frequently __section(".data.read_frequently") 172 #define __exclusive_cache_line __aligned(__VM_CACHELINE_SIZE*2) \ 173 __section(".data.exclusive_cache_line") 174 175 #else 176 #define __dead2 177 #define __pure2 178 #define __unused 179 #endif 180 181 #if __GNUC_PREREQ__(2, 96) 182 #define __malloclike __attribute__((__malloc__)) 183 #define __pure __attribute__((__pure__)) 184 #else 185 #define __malloclike 186 #define __pure __pure2 187 #endif 188 189 #if __GNUC_PREREQ__(3, 1) 190 #define __always_inline __attribute__((__always_inline__)) 191 #define __noinline __attribute__((__noinline__)) 192 #else 193 #define __always_inline 194 #define __noinline 195 #endif 196 197 #if __GNUC_PREREQ__(3, 3) 198 #define __nonnull(...) __attribute__((__nonnull__(__VA_ARGS__))) 199 #define __used __attribute__((__used__)) 200 #else 201 #define __nonnull(...) 202 #define __used __unused 203 #endif 204 205 #if __GNUC_PREREQ__(3, 4) 206 #define __heedresult __attribute__((__warn_unused_result__)) 207 #else 208 #define __heedresult 209 #endif 210 211 #if __GNUC_PREREQ__(4, 1) 212 #define __returns_twice __attribute__((__returns_twice__)) 213 #else 214 #define __returns_twice 215 #endif 216 217 #if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__) 218 #define __alloc_size(x) __attribute__((__alloc_size__(x))) 219 #define __alloc_size2(n, x) __attribute__((__alloc_size__(n, x))) 220 #else 221 #define __alloc_size(x) 222 #define __alloc_size2(n, x) 223 #endif 224 225 #if __GNUC_PREREQ__(4, 9) || __has_attribute(__alloc_align__) 226 #define __alloc_align(x) __attribute__((__alloc_align__(x))) 227 #else 228 #define __alloc_align(x) 229 #endif 230 231 #if !__GNUC_PREREQ__(2, 7) && __STDC_VERSION__ < 199901 232 #define __func__ NULL 233 #endif 234 235 #if (__GNUC_PREREQ__(2, 0) && !defined(__STRICT_ANSI__)) || \ 236 __STDC_VERSION__ >= 199901 237 #define __LONG_LONG_SUPPORTED 238 #endif 239 240 /* C++11 exposes a load of C99 stuff */ 241 #if defined(__cplusplus) && __cplusplus >= 201103L 242 #define __LONG_LONG_SUPPORTED 243 #ifndef __STDC_LIMIT_MACROS 244 #define __STDC_LIMIT_MACROS 245 #endif 246 #ifndef __STDC_CONSTANT_MACROS 247 #define __STDC_CONSTANT_MACROS 248 #endif 249 #endif 250 251 /* 252 * GCC 2.95 and later provides `__restrict' as an extension to C90 to support 253 * the C99-specific `restrict' type qualifier. We happen to use `__restrict' 254 * as a way to define the `restrict' type qualifier without disturbing older 255 * software that is unaware of C99 keywords. 256 */ 257 #if !__GNUC_PREREQ__(2, 95) 258 #if __STDC_VERSION__ < 199901 259 #define __restrict 260 #else 261 #define __restrict restrict 262 #endif 263 #endif 264 265 /* 266 * C99 allows to declare arrays as non-overlapping. 267 */ 268 #if __GNUC_PREREQ__(3, 1) && !defined(__GNUG__) 269 #define __restrict_arr __restrict 270 #else 271 #ifdef __GNUC__ 272 #define __restrict_arr 273 #else 274 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901 275 #define __restrict_arr restrict 276 #else 277 #define __restrict_arr 278 #endif 279 #endif 280 #endif 281 282 /* 283 * GNU C version 2.96 adds explicit branch prediction so that 284 * the CPU back-end can hint the processor and also so that 285 * code blocks can be reordered such that the predicted path 286 * sees a more linear flow, thus improving cache behavior, etc. 287 * 288 * The following two macros provide us with a way to utilize this 289 * compiler feature. Use __predict_true() if you expect the expression 290 * to evaluate to true, and __predict_false() if you expect the 291 * expression to evaluate to false. 292 * 293 * A few notes about usage: 294 * 295 * * Generally, __predict_false() error condition checks (unless 296 * you have some _strong_ reason to do otherwise, in which case 297 * document it), and/or __predict_true() `no-error' condition 298 * checks, assuming you want to optimize for the no-error case. 299 * 300 * * Other than that, if you don't know the likelihood of a test 301 * succeeding from empirical or other `hard' evidence, don't 302 * make predictions. 303 * 304 * * These are meant to be used in places that are run `a lot'. 305 * It is wasteful to make predictions in code that is run 306 * seldomly (e.g. at subsystem initialization time) as the 307 * basic block reordering that this affects can often generate 308 * larger code. 309 */ 310 #if __GNUC_PREREQ__(2, 96) 311 #define __predict_true(exp) __builtin_expect((exp), 1) 312 #define __predict_false(exp) __builtin_expect((exp), 0) 313 #else 314 #define __predict_true(exp) (exp) 315 #define __predict_false(exp) (exp) 316 #endif 317 318 /* 319 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h> 320 * require it. 321 */ 322 #if __GNUC_PREREQ__(4, 1) 323 #define __offsetof(type, field) __builtin_offsetof(type, field) 324 #else 325 #ifndef __cplusplus 326 #define __offsetof(type, field) \ 327 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field)) 328 #else 329 #define __offsetof(type, field) \ 330 (__offsetof__ (reinterpret_cast <__size_t> \ 331 (&reinterpret_cast <const volatile char &> \ 332 (static_cast<type *> (0)->field)))) 333 #endif 334 #endif 335 336 /* 337 * Compiler-dependent macros to declare that functions take printf-like 338 * or scanf-like arguments. They are null except for versions of gcc 339 * that are known to support the features properly (old versions of gcc-2 340 * didn't permit keeping the keywords out of the application namespace). 341 * 342 * The printf0like macro for GCC 2 uses DragonFly specific compiler extensions. 343 */ 344 #if !__GNUC_PREREQ__(2, 7) 345 #define __printflike(fmtarg, firstvararg) 346 #define __scanflike(fmtarg, firstvararg) 347 #define __printf0like(fmtarg, firstvararg) 348 #define __format_arg(fmtarg) 349 #define __strfmonlike(fmtarg, firstvararg) 350 #define __strftimelike(fmtarg, firstvararg) 351 352 #elif __GNUC_PREREQ__(3, 0) 353 #define __printflike(fmtarg, firstvararg) \ 354 __attribute__((__nonnull__(fmtarg), \ 355 __format__ (__printf__, fmtarg, firstvararg))) 356 #define __printf0like(fmtarg, firstvararg) \ 357 __attribute__((__format__ (__printf__, fmtarg, firstvararg))) 358 #define __scanflike(fmtarg, firstvararg) \ 359 __attribute__((__format__ (__scanf__, fmtarg, firstvararg))) 360 #define __format_arg(fmtarg) \ 361 __attribute__((__format_arg__ (fmtarg))) 362 #define __strfmonlike(fmtarg, firstvararg) \ 363 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg))) 364 #define __strftimelike(fmtarg, firstvararg) \ 365 __attribute__((__format__ (__strftime__, fmtarg, firstvararg))) 366 367 #else 368 #define __printflike(fmtarg, firstvararg) \ 369 __attribute__((__format__ (__printf__, fmtarg, firstvararg))) 370 #define __printf0like(fmtarg, firstvararg) \ 371 __attribute__((__format__ (__printf0__, fmtarg, firstvararg))) 372 #define __scanflike(fmtarg, firstvararg) \ 373 __attribute__((__format__ (__scanf__, fmtarg, firstvararg))) 374 #define __format_arg(fmtarg) \ 375 __attribute__((__format_arg__ (fmtarg))) 376 #define __strfmonlike(fmtarg, firstvararg) \ 377 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg))) 378 #define __strftimelike(fmtarg, firstvararg) \ 379 __attribute__((__format__ (__strftime__, fmtarg, firstvararg))) 380 #endif 381 382 #if !__GNUC_PREREQ__(3, 0) 383 #define __ARRAY_ZERO 0 384 #else 385 #define __ARRAY_ZERO 386 #endif 387 388 #if __GNUC_PREREQ__(4, 0) 389 #define __dso_public __attribute__((__visibility__("default"))) 390 #define __dso_hidden __attribute__((__visibility__("hidden"))) 391 #else 392 #define __dso_public 393 #define __dso_hidden 394 #endif 395 396 /* 397 * A convenient constructor macro, GCC 4.3.0 added priority support to 398 * constructors, provide a compatible interface for both. 399 */ 400 #if __GNUC_PREREQ__(4, 3) 401 #define __constructor(prio) __attribute__((constructor(prio))) 402 #else 403 #define __constructor(prio) __attribute__((constructor)) 404 #endif 405 406 /* 407 * Handy GCC based macros: 408 * 409 * __cachealign: 410 * 411 * The __cachealign macro can be used for cache line aligning structures 412 * of small to medium size. It aligns the particular structure or 413 * storage type to a system default cache line alignment, thus giving us 414 * a much more better cache utilization by making the hardware work at 415 * its best burst speeds. 416 * 417 * __usereg: 418 * 419 * The __usereg macro can/should be used when a function contains 420 * arguments not more than 3. It can be very useful to us due to the 421 * message-passing nature of the kernel. 422 * 423 * !!NOTE - USAGE INFORMATION!! 424 * 425 * The __cachealign macro should not be used for data structures that are 426 * as big struct proc, struct vnode, struct thread, and other structs which 427 * are as big as them; simply because it will be useless in that case. 428 * 429 * The __usereg macro should be used whenever possible, i.e., when a function 430 * does not exceed more than 3 arguments, and should not be used for vararg 431 * type functions. 432 * 433 * In other words, AVOID MISUSE OF THESE MACROS. :-) 434 */ 435 #ifdef __GNUC__ 436 #define __cachealign __attribute__((__aligned__(__VM_CACHELINE_SIZE))) 437 #define __usereg __attribute__((__regparm__(3))) 438 #else 439 #define __cachealign 440 #define __usereg 441 #endif 442 443 #ifdef __GNUC__ 444 #define __strong_reference(sym,aliassym) \ 445 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym))) 446 #define __weak_reference(sym,aliassym) \ 447 __strong_reference(sym,aliassym) __attribute__ ((__weak__)) 448 #define __weak_reference_asm(sym,alias) \ 449 __asm__(".weak " #alias); \ 450 __asm__(".equ " #alias ", " #sym) 451 #define __warn_references(sym,msg) \ 452 __asm__(".section .gnu.warning." #sym); \ 453 __asm__(".asciz \"" msg "\""); \ 454 __asm__(".previous") 455 #define __sym_compat(sym,impl,verid) \ 456 __asm__(".symver " #impl ", " #sym "@" #verid) 457 #define __sym_default(sym,impl,verid) \ 458 __asm__(".symver " #impl ", " #sym "@@@" #verid) 459 #endif /* __GNUC__ */ 460 461 #if defined(__GNUC__) 462 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"") 463 #endif 464 465 #ifndef __RCSID 466 #define __RCSID(s) struct __hack 467 #endif 468 469 #ifndef __RCSID_SOURCE 470 #define __RCSID_SOURCE(s) struct __hack 471 #endif 472 473 #ifndef __SCCSID 474 #define __SCCSID(s) struct __hack 475 #endif 476 477 #ifndef __FBSDID 478 #define __FBSDID(s) struct __hack 479 #endif 480 481 #ifndef __COPYRIGHT 482 #define __COPYRIGHT(s) struct __hack 483 #endif 484 485 #ifndef __DECONST 486 #define __DECONST(type, var) ((type)(uintptr_t)(const void *)(var)) 487 #endif 488 489 #ifndef __DEVOLATILE 490 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var)) 491 #endif 492 493 #ifndef __DEQUALIFY 494 #define __DEQUALIFY(type, var) ((type)(uintptr_t)(const volatile void *)(var)) 495 #endif 496 497 /* 498 * Keywords added in C11. 499 */ 500 501 #if !__GNUC_PREREQ__(2, 95) 502 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b) 503 #endif 504 505 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L 506 507 #if !__has_extension(c_alignas) 508 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \ 509 __has_extension(cxx_alignas) 510 #define _Alignas(x) alignas(x) 511 #else 512 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */ 513 #define _Alignas(x) __aligned(x) 514 #endif 515 #endif 516 517 #if defined(__cplusplus) && __cplusplus >= 201103L 518 #define _Alignof(x) alignof(x) 519 #else 520 #define _Alignof(x) __alignof(x) 521 #endif 522 523 #if !defined(_Noreturn) 524 #define _Noreturn __dead2 525 #endif 526 527 #if !__has_extension(c_static_assert) 528 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \ 529 __has_extension(cxx_static_assert) 530 #define _Static_assert(x, y) static_assert(x, y) 531 #elif !__GNUC_PREREQ__(4, 6) 532 #define _Static_assert(x, y) struct __hack 533 #ifdef _KERNEL 534 #define CTASSERT(x) _CTASSERT(x, __LINE__) 535 #define _CTASSERT(x, y) __CTASSERT(x, y) 536 #define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1] 537 #endif 538 #endif 539 #endif 540 541 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */ 542 543 #if defined(_KERNEL) && !defined(CTASSERT) 544 #define CTASSERT(x) _Static_assert(x, \ 545 "compile-time assertion failed") 546 #endif 547 548 /* 549 * Emulation of C11 _Generic(). Unlike the previously defined C11 550 * keywords, it is not possible to implement this using exactly the same 551 * syntax. Therefore implement something similar under the name 552 * __generic(). Unlike _Generic(), this macro can only distinguish 553 * between a single type, so it requires nested invocations to 554 * distinguish multiple cases. 555 */ 556 557 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L 558 #define __generic(expr, t, yes, no) \ 559 _Generic(expr, t: yes, default: no) 560 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus) 561 #define __generic(expr, t, yes, no) \ 562 __builtin_choose_expr( \ 563 __builtin_types_compatible_p(__typeof(expr), t), yes, no) 564 #endif 565 566 /*- 567 * POSIX.1 requires that the macros we test be defined before any standard 568 * header file is included. 569 * 570 * Here's a quick run-down of the versions: 571 * defined(_POSIX_SOURCE) 1003.1-1988 572 * _POSIX_C_SOURCE == 1 1003.1-1990 573 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option 574 * _POSIX_C_SOURCE == 199309 1003.1b-1993 575 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995, 576 * and the omnibus ISO/IEC 9945-1: 1996 577 * _POSIX_C_SOURCE == 200112 1003.1-2001 578 * _POSIX_C_SOURCE == 200809 1003.1-2008 579 * 580 * In addition, the X/Open Portability Guide, which is now the Single UNIX 581 * Specification, defines a feature-test macro which indicates the version of 582 * that specification, and which subsumes _POSIX_C_SOURCE. 583 * 584 * Our macros begin with two underscores to avoid namespace screwage. 585 */ 586 587 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */ 588 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 1 589 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */ 590 #define _POSIX_C_SOURCE 199009 591 #endif 592 593 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */ 594 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 2 595 #undef _POSIX_C_SOURCE 596 #define _POSIX_C_SOURCE 199209 597 #endif 598 599 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */ 600 #ifdef _XOPEN_SOURCE 601 #if _XOPEN_SOURCE - 0 >= 700 602 #define __XSI_VISIBLE 700 603 #undef _POSIX_C_SOURCE 604 #define _POSIX_C_SOURCE 200809 605 #elif _XOPEN_SOURCE - 0 >= 600 606 #define __XSI_VISIBLE 600 607 #undef _POSIX_C_SOURCE 608 #define _POSIX_C_SOURCE 200112 609 #elif _XOPEN_SOURCE - 0 >= 500 610 #define __XSI_VISIBLE 500 611 #undef _POSIX_C_SOURCE 612 #define _POSIX_C_SOURCE 199506 613 #endif 614 #endif 615 616 /* 617 * Deal with all versions of POSIX. The ordering relative to the tests above is 618 * important. 619 */ 620 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) 621 #define _POSIX_C_SOURCE 198808 622 #endif 623 #ifdef _POSIX_C_SOURCE 624 #if (_POSIX_C_SOURCE - 0) >= 200809 625 #define __POSIX_VISIBLE 200809 626 #define __ISO_C_VISIBLE 1999 627 #elif (_POSIX_C_SOURCE - 0) >= 200112 628 #define __POSIX_VISIBLE 200112 629 #define __ISO_C_VISIBLE 1999 630 #elif (_POSIX_C_SOURCE - 0) >= 199506 631 #define __POSIX_VISIBLE 199506 632 #define __ISO_C_VISIBLE 1990 633 #elif (_POSIX_C_SOURCE - 0) >= 199309 634 #define __POSIX_VISIBLE 199309 635 #define __ISO_C_VISIBLE 1990 636 #elif (_POSIX_C_SOURCE - 0) >= 199209 637 #define __POSIX_VISIBLE 199209 638 #define __ISO_C_VISIBLE 1990 639 #elif (_POSIX_C_SOURCE - 0) >= 199009 640 #define __POSIX_VISIBLE 199009 641 #define __ISO_C_VISIBLE 1990 642 #else 643 #define __POSIX_VISIBLE 198808 644 #define __ISO_C_VISIBLE 0 645 #endif /* _POSIX_C_SOURCE */ 646 #else 647 /*- 648 * Deal with _ANSI_SOURCE: 649 * If it is defined, and no other compilation environment is explicitly 650 * requested, then define our internal feature-test macros to zero. This 651 * makes no difference to the preprocessor (undefined symbols in preprocessing 652 * expressions are defined to have value zero), but makes it more convenient for 653 * a test program to print out the values. 654 * 655 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as 656 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation 657 * environment (and in fact we will never get here). 658 */ 659 #if defined(_ANSI_SOURCE) /* Hide almost everything. */ 660 #define __POSIX_VISIBLE 0 661 #define __XSI_VISIBLE 0 662 #define __BSD_VISIBLE 0 663 #define __ISO_C_VISIBLE 1990 664 #define __EXT1_VISIBLE 0 665 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */ 666 #define __POSIX_VISIBLE 0 667 #define __XSI_VISIBLE 0 668 #define __BSD_VISIBLE 0 669 #define __ISO_C_VISIBLE 1999 670 #define __EXT1_VISIBLE 0 671 #elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */ 672 #define __POSIX_VISIBLE 0 673 #define __XSI_VISIBLE 0 674 #define __BSD_VISIBLE 0 675 #define __ISO_C_VISIBLE 2011 676 #define __EXT1_VISIBLE 0 677 #else /* Default environment: show everything. */ 678 #define __POSIX_VISIBLE 200809 679 #define __XSI_VISIBLE 700 680 #define __BSD_VISIBLE 1 681 #define __ISO_C_VISIBLE 2011 682 #define __EXT1_VISIBLE 1 683 #endif 684 #endif 685 686 /* User override __EXT1_VISIBLE */ 687 #if defined(__STDC_WANT_LIB_EXT1__) 688 #undef __EXT1_VISIBLE 689 #if __STDC_WANT_LIB_EXT1__ 690 #define __EXT1_VISIBLE 1 691 #else 692 #define __EXT1_VISIBLE 0 693 #endif 694 #endif /* __STDC_WANT_LIB_EXT1__ */ 695 696 /* 697 * GLOBL macro exists to preserve __start_set_* and __stop_set_* sections 698 * of kernel modules which are discarded from binutils 2.17.50+ otherwise. 699 */ 700 701 #define __GLOBL1(sym) __asm__(".globl " #sym) 702 #define __GLOBL(sym) __GLOBL1(sym) 703 704 #endif /* !_SYS_CDEFS_H_ */ 705