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 #else 171 #define __dead2 172 #define __pure2 173 #define __unused 174 #endif 175 176 #if __GNUC_PREREQ__(2, 96) 177 #define __malloclike __attribute__((__malloc__)) 178 #define __pure __attribute__((__pure__)) 179 #else 180 #define __malloclike 181 #define __pure __pure2 182 #endif 183 184 #if __GNUC_PREREQ__(3, 1) 185 #define __always_inline __attribute__((__always_inline__)) 186 #define __noinline __attribute__((__noinline__)) 187 #else 188 #define __always_inline 189 #define __noinline 190 #endif 191 192 #if __GNUC_PREREQ__(3, 3) 193 #define __nonnull(...) __attribute__((__nonnull__(__VA_ARGS__))) 194 #define __used __attribute__((__used__)) 195 #else 196 #define __nonnull(...) 197 #define __used __unused 198 #endif 199 200 #if __GNUC_PREREQ__(3, 4) 201 #define __heedresult __attribute__((__warn_unused_result__)) 202 #else 203 #define __heedresult 204 #endif 205 206 #if __GNUC_PREREQ__(4, 1) 207 #define __returns_twice __attribute__((__returns_twice__)) 208 #else 209 #define __returns_twice 210 #endif 211 212 #if __GNUC_PREREQ__(4, 6) || __has_builtin(__builtin_unreachable) 213 #define __unreachable() __builtin_unreachable() 214 #else 215 #define __unreachable() ((void)0) 216 #endif 217 218 #if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__) 219 #define __alloc_size(x) __attribute__((__alloc_size__(x))) 220 #define __alloc_size2(n, x) __attribute__((__alloc_size__(n, x))) 221 #else 222 #define __alloc_size(x) 223 #define __alloc_size2(n, x) 224 #endif 225 226 #if __GNUC_PREREQ__(4, 9) || __has_attribute(__alloc_align__) 227 #define __alloc_align(x) __attribute__((__alloc_align__(x))) 228 #else 229 #define __alloc_align(x) 230 #endif 231 232 #if !__GNUC_PREREQ__(2, 7) && __STDC_VERSION__ < 199901 233 #define __func__ NULL 234 #endif 235 236 #if (__GNUC_PREREQ__(2, 0) && !defined(__STRICT_ANSI__)) || \ 237 __STDC_VERSION__ >= 199901 238 #define __LONG_LONG_SUPPORTED 239 #endif 240 241 /* C++11 exposes a load of C99 stuff */ 242 #if defined(__cplusplus) && __cplusplus >= 201103L 243 #define __LONG_LONG_SUPPORTED 244 #ifndef __STDC_LIMIT_MACROS 245 #define __STDC_LIMIT_MACROS 246 #endif 247 #ifndef __STDC_CONSTANT_MACROS 248 #define __STDC_CONSTANT_MACROS 249 #endif 250 #endif 251 252 /* 253 * GCC 2.95 and later provides `__restrict' as an extension to C90 to support 254 * the C99-specific `restrict' type qualifier. We happen to use `__restrict' 255 * as a way to define the `restrict' type qualifier without disturbing older 256 * software that is unaware of C99 keywords. 257 */ 258 #if !__GNUC_PREREQ__(2, 95) 259 #if __STDC_VERSION__ < 199901 260 #define __restrict 261 #else 262 #define __restrict restrict 263 #endif 264 #endif 265 266 /* 267 * C99 allows to declare arrays as non-overlapping. 268 */ 269 #if __GNUC_PREREQ__(3, 1) && !defined(__GNUG__) 270 #define __restrict_arr __restrict 271 #else 272 #ifdef __GNUC__ 273 #define __restrict_arr 274 #else 275 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901 276 #define __restrict_arr restrict 277 #else 278 #define __restrict_arr 279 #endif 280 #endif 281 #endif 282 283 /* 284 * GNU C version 2.96 adds explicit branch prediction so that 285 * the CPU back-end can hint the processor and also so that 286 * code blocks can be reordered such that the predicted path 287 * sees a more linear flow, thus improving cache behavior, etc. 288 * 289 * The following two macros provide us with a way to utilize this 290 * compiler feature. Use __predict_true() if you expect the expression 291 * to evaluate to true, and __predict_false() if you expect the 292 * expression to evaluate to false. 293 * 294 * A few notes about usage: 295 * 296 * * Generally, __predict_false() error condition checks (unless 297 * you have some _strong_ reason to do otherwise, in which case 298 * document it), and/or __predict_true() `no-error' condition 299 * checks, assuming you want to optimize for the no-error case. 300 * 301 * * Other than that, if you don't know the likelihood of a test 302 * succeeding from empirical or other `hard' evidence, don't 303 * make predictions. 304 * 305 * * These are meant to be used in places that are run `a lot'. 306 * It is wasteful to make predictions in code that is run 307 * seldomly (e.g. at subsystem initialization time) as the 308 * basic block reordering that this affects can often generate 309 * larger code. 310 */ 311 #if __GNUC_PREREQ__(2, 96) 312 #define __predict_true(exp) __builtin_expect((exp), 1) 313 #define __predict_false(exp) __builtin_expect((exp), 0) 314 #else 315 #define __predict_true(exp) (exp) 316 #define __predict_false(exp) (exp) 317 #endif 318 319 /* 320 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h> 321 * require it. 322 */ 323 #if __GNUC_PREREQ__(4, 1) 324 #define __offsetof(type, field) __builtin_offsetof(type, field) 325 #else 326 #ifndef __cplusplus 327 #define __offsetof(type, field) \ 328 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field)) 329 #else 330 #define __offsetof(type, field) \ 331 (__offsetof__ (reinterpret_cast <__size_t> \ 332 (&reinterpret_cast <const volatile char &> \ 333 (static_cast<type *> (0)->field)))) 334 #endif 335 #endif 336 337 /* 338 * Compiler-dependent macros to declare that functions take printf-like 339 * or scanf-like arguments. They are null except for versions of gcc 340 * that are known to support the features properly (old versions of gcc-2 341 * didn't permit keeping the keywords out of the application namespace). 342 * 343 * The printf0like macro for GCC 2 uses DragonFly specific compiler extensions. 344 */ 345 #if !__GNUC_PREREQ__(2, 7) 346 #define __printflike(fmtarg, firstvararg) 347 #define __scanflike(fmtarg, firstvararg) 348 #define __printf0like(fmtarg, firstvararg) 349 #define __format_arg(fmtarg) 350 #define __strfmonlike(fmtarg, firstvararg) 351 #define __strftimelike(fmtarg, firstvararg) 352 353 #elif __GNUC_PREREQ__(3, 0) 354 #define __printflike(fmtarg, firstvararg) \ 355 __attribute__((__nonnull__(fmtarg), \ 356 __format__ (__printf__, fmtarg, firstvararg))) 357 #define __printf0like(fmtarg, firstvararg) \ 358 __attribute__((__format__ (__printf__, fmtarg, firstvararg))) 359 #define __scanflike(fmtarg, firstvararg) \ 360 __attribute__((__format__ (__scanf__, fmtarg, firstvararg))) 361 #define __format_arg(fmtarg) \ 362 __attribute__((__format_arg__ (fmtarg))) 363 #define __strfmonlike(fmtarg, firstvararg) \ 364 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg))) 365 #define __strftimelike(fmtarg, firstvararg) \ 366 __attribute__((__format__ (__strftime__, fmtarg, firstvararg))) 367 368 #else 369 #define __printflike(fmtarg, firstvararg) \ 370 __attribute__((__format__ (__printf__, fmtarg, firstvararg))) 371 #define __printf0like(fmtarg, firstvararg) \ 372 __attribute__((__format__ (__printf0__, fmtarg, firstvararg))) 373 #define __scanflike(fmtarg, firstvararg) \ 374 __attribute__((__format__ (__scanf__, fmtarg, firstvararg))) 375 #define __format_arg(fmtarg) \ 376 __attribute__((__format_arg__ (fmtarg))) 377 #define __strfmonlike(fmtarg, firstvararg) \ 378 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg))) 379 #define __strftimelike(fmtarg, firstvararg) \ 380 __attribute__((__format__ (__strftime__, fmtarg, firstvararg))) 381 #endif 382 383 #if !__GNUC_PREREQ__(3, 0) 384 #define __ARRAY_ZERO 0 385 #else 386 #define __ARRAY_ZERO 387 #endif 388 389 #if __GNUC_PREREQ__(4, 0) 390 #define __dso_public __attribute__((__visibility__("default"))) 391 #define __dso_hidden __attribute__((__visibility__("hidden"))) 392 #else 393 #define __dso_public 394 #define __dso_hidden 395 #endif 396 397 /* 398 * A convenient constructor macro, GCC 4.3.0 added priority support to 399 * constructors, provide a compatible interface for both. 400 */ 401 #if __GNUC_PREREQ__(4, 3) 402 #define __constructor(prio) __attribute__((constructor(prio))) 403 #else 404 #define __constructor(prio) __attribute__((constructor)) 405 #endif 406 407 /* 408 * Handy GCC based macros: 409 * 410 * __cachealign: 411 * 412 * The __cachealign macro can be used for cache line aligning structures 413 * of small to medium size. It aligns the particular structure or 414 * storage type to a system default cache line alignment, thus giving us 415 * a much more better cache utilization by making the hardware work at 416 * its best burst speeds. 417 * 418 * __usereg: 419 * 420 * The __usereg macro can/should be used when a function contains 421 * arguments not more than 3. It can be very useful to us due to the 422 * message-passing nature of the kernel. 423 * 424 * !!NOTE - USAGE INFORMATION!! 425 * 426 * The __cachealign macro should not be used for data structures that are 427 * as big struct proc, struct vnode, struct thread, and other structs which 428 * are as big as them; simply because it will be useless in that case. 429 * 430 * The __usereg macro should be used whenever possible, i.e., when a function 431 * does not exceed more than 3 arguments, and should not be used for vararg 432 * type functions. 433 * 434 * In other words, AVOID MISUSE OF THESE MACROS. :-) 435 */ 436 #ifdef __GNUC__ 437 #define __cachealign __attribute__((__aligned__(__VM_CACHELINE_SIZE))) 438 #define __usereg __attribute__((__regparm__(3))) 439 #else 440 #define __cachealign 441 #define __usereg 442 #endif 443 444 #ifdef __GNUC__ 445 #define __strong_reference(sym,aliassym) \ 446 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym))) 447 #define __weak_reference(sym,aliassym) \ 448 __strong_reference(sym,aliassym) __attribute__ ((__weak__)) 449 #define __weak_reference_asm(sym,alias) \ 450 __asm__(".weak " #alias); \ 451 __asm__(".equ " #alias ", " #sym) 452 #define __warn_references(sym,msg) \ 453 __asm__(".section .gnu.warning." #sym); \ 454 __asm__(".asciz \"" msg "\""); \ 455 __asm__(".previous") 456 #define __sym_compat(sym,impl,verid) \ 457 __asm__(".symver " #impl ", " #sym "@" #verid) 458 #define __sym_default(sym,impl,verid) \ 459 __asm__(".symver " #impl ", " #sym "@@@" #verid) 460 #endif /* __GNUC__ */ 461 462 #if defined(__GNUC__) 463 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"") 464 #endif 465 466 #ifndef __RCSID 467 #define __RCSID(s) struct __hack 468 #endif 469 470 #ifndef __RCSID_SOURCE 471 #define __RCSID_SOURCE(s) struct __hack 472 #endif 473 474 #ifndef __SCCSID 475 #define __SCCSID(s) struct __hack 476 #endif 477 478 #ifndef __FBSDID 479 #define __FBSDID(s) struct __hack 480 #endif 481 482 #ifndef __COPYRIGHT 483 #define __COPYRIGHT(s) struct __hack 484 #endif 485 486 #ifndef __DECONST 487 #define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var)) 488 #endif 489 490 #ifndef __DEVOLATILE 491 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var)) 492 #endif 493 494 #ifndef __DEQUALIFY 495 #define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var)) 496 #endif 497 498 /* 499 * Keywords added in C11. 500 */ 501 502 #if !__GNUC_PREREQ__(2, 95) 503 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b) 504 #endif 505 506 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L 507 508 #if !__has_extension(c_alignas) 509 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \ 510 __has_extension(cxx_alignas) 511 #define _Alignas(x) alignas(x) 512 #else 513 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */ 514 #define _Alignas(x) __aligned(x) 515 #endif 516 #endif 517 518 #if defined(__cplusplus) && __cplusplus >= 201103L 519 #define _Alignof(x) alignof(x) 520 #else 521 #define _Alignof(x) __alignof(x) 522 #endif 523 524 #if !defined(_Noreturn) 525 #define _Noreturn __dead2 526 #endif 527 528 #if !__has_extension(c_static_assert) 529 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \ 530 __has_extension(cxx_static_assert) 531 #define _Static_assert(x, y) static_assert(x, y) 532 #elif !__GNUC_PREREQ__(4, 6) 533 #define _Static_assert(x, y) struct __hack 534 #ifdef _KERNEL 535 #define CTASSERT(x) _CTASSERT(x, __LINE__) 536 #define _CTASSERT(x, y) __CTASSERT(x, y) 537 #define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1] 538 #endif 539 #endif 540 541 /* 542 * GCC 4.7 has -std=c++11 but does not support thread_local. 543 */ 544 #if !__has_extension(c_thread_local) 545 #if (defined(__cplusplus) && __cplusplus >= 201103L && __GNUC_PREREQ__(4, 8)) || \ 546 __has_extension(cxx_thread_local) 547 #define _Thread_local thread_local 548 #else 549 #define _Thread_local __thread 550 #endif 551 #endif 552 #endif 553 554 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */ 555 556 #if defined(_KERNEL) && !defined(CTASSERT) 557 #define CTASSERT(x) _Static_assert(x, \ 558 "compile-time assertion failed") 559 #endif 560 561 /* 562 * Emulation of C11 _Generic(). Unlike the previously defined C11 563 * keywords, it is not possible to implement this using exactly the same 564 * syntax. Therefore implement something similar under the name 565 * __generic(). Unlike _Generic(), this macro can only distinguish 566 * between a single type, so it requires nested invocations to 567 * distinguish multiple cases. 568 */ 569 570 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L 571 #define __generic(expr, t, yes, no) \ 572 _Generic(expr, t: yes, default: no) 573 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus) 574 #define __generic(expr, t, yes, no) \ 575 __builtin_choose_expr( \ 576 __builtin_types_compatible_p(__typeof(expr), t), yes, no) 577 #endif 578 579 /*- 580 * POSIX.1 requires that the macros we test be defined before any standard 581 * header file is included. 582 * 583 * Here's a quick run-down of the versions: 584 * defined(_POSIX_SOURCE) 1003.1-1988 585 * _POSIX_C_SOURCE == 1 1003.1-1990 586 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option 587 * _POSIX_C_SOURCE == 199309 1003.1b-1993 588 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995, 589 * and the omnibus ISO/IEC 9945-1: 1996 590 * _POSIX_C_SOURCE == 200112 1003.1-2001 591 * _POSIX_C_SOURCE == 200809 1003.1-2008 592 * 593 * In addition, the X/Open Portability Guide, which is now the Single UNIX 594 * Specification, defines a feature-test macro which indicates the version of 595 * that specification, and which subsumes _POSIX_C_SOURCE. 596 * 597 * Our macros begin with two underscores to avoid namespace screwage. 598 */ 599 600 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */ 601 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 1 602 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */ 603 #define _POSIX_C_SOURCE 199009 604 #endif 605 606 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */ 607 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 2 608 #undef _POSIX_C_SOURCE 609 #define _POSIX_C_SOURCE 199209 610 #endif 611 612 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */ 613 #ifdef _XOPEN_SOURCE 614 #if _XOPEN_SOURCE - 0 >= 700 615 #define __XSI_VISIBLE 700 616 #undef _POSIX_C_SOURCE 617 #define _POSIX_C_SOURCE 200809 618 #elif _XOPEN_SOURCE - 0 >= 600 619 #define __XSI_VISIBLE 600 620 #undef _POSIX_C_SOURCE 621 #define _POSIX_C_SOURCE 200112 622 #elif _XOPEN_SOURCE - 0 >= 500 623 #define __XSI_VISIBLE 500 624 #undef _POSIX_C_SOURCE 625 #define _POSIX_C_SOURCE 199506 626 #endif 627 #endif 628 629 /* 630 * Deal with all versions of POSIX. The ordering relative to the tests above is 631 * important. 632 */ 633 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) 634 #define _POSIX_C_SOURCE 198808 635 #endif 636 #ifdef _POSIX_C_SOURCE 637 #if (_POSIX_C_SOURCE - 0) >= 200809 638 #define __POSIX_VISIBLE 200809 639 #define __ISO_C_VISIBLE 1999 640 #elif (_POSIX_C_SOURCE - 0) >= 200112 641 #define __POSIX_VISIBLE 200112 642 #define __ISO_C_VISIBLE 1999 643 #elif (_POSIX_C_SOURCE - 0) >= 199506 644 #define __POSIX_VISIBLE 199506 645 #define __ISO_C_VISIBLE 1990 646 #elif (_POSIX_C_SOURCE - 0) >= 199309 647 #define __POSIX_VISIBLE 199309 648 #define __ISO_C_VISIBLE 1990 649 #elif (_POSIX_C_SOURCE - 0) >= 199209 650 #define __POSIX_VISIBLE 199209 651 #define __ISO_C_VISIBLE 1990 652 #elif (_POSIX_C_SOURCE - 0) >= 199009 653 #define __POSIX_VISIBLE 199009 654 #define __ISO_C_VISIBLE 1990 655 #else 656 #define __POSIX_VISIBLE 198808 657 #define __ISO_C_VISIBLE 0 658 #endif /* _POSIX_C_SOURCE */ 659 #else 660 /*- 661 * Deal with _ANSI_SOURCE: 662 * If it is defined, and no other compilation environment is explicitly 663 * requested, then define our internal feature-test macros to zero. This 664 * makes no difference to the preprocessor (undefined symbols in preprocessing 665 * expressions are defined to have value zero), but makes it more convenient for 666 * a test program to print out the values. 667 * 668 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as 669 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation 670 * environment (and in fact we will never get here). 671 */ 672 #if defined(_ANSI_SOURCE) /* Hide almost everything. */ 673 #define __POSIX_VISIBLE 0 674 #define __XSI_VISIBLE 0 675 #define __BSD_VISIBLE 0 676 #define __ISO_C_VISIBLE 1990 677 #define __EXT1_VISIBLE 0 678 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */ 679 #define __POSIX_VISIBLE 0 680 #define __XSI_VISIBLE 0 681 #define __BSD_VISIBLE 0 682 #define __ISO_C_VISIBLE 1999 683 #define __EXT1_VISIBLE 0 684 #elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */ 685 #define __POSIX_VISIBLE 0 686 #define __XSI_VISIBLE 0 687 #define __BSD_VISIBLE 0 688 #define __ISO_C_VISIBLE 2011 689 #define __EXT1_VISIBLE 0 690 #else /* Default environment: show everything. */ 691 #define __POSIX_VISIBLE 200809 692 #define __XSI_VISIBLE 700 693 #define __BSD_VISIBLE 1 694 #define __ISO_C_VISIBLE 2011 695 #define __EXT1_VISIBLE 1 696 #endif 697 #endif 698 699 /* User override __EXT1_VISIBLE */ 700 #if defined(__STDC_WANT_LIB_EXT1__) 701 #undef __EXT1_VISIBLE 702 #if __STDC_WANT_LIB_EXT1__ 703 #define __EXT1_VISIBLE 1 704 #else 705 #define __EXT1_VISIBLE 0 706 #endif 707 #endif /* __STDC_WANT_LIB_EXT1__ */ 708 709 #ifndef __BSD_VISIBLE 710 #define __BSD_VISIBLE 0 711 #endif 712 #ifndef __EXT1_VISIBLE 713 #define __EXT1_VISIBLE 0 714 #endif 715 716 /* 717 * GLOBL macro exists to preserve __start_set_* and __stop_set_* sections 718 * of kernel modules which are discarded from binutils 2.17.50+ otherwise. 719 */ 720 721 #define __GLOBL1(sym) __asm__(".globl " #sym) 722 #define __GLOBL(sym) __GLOBL1(sym) 723 724 #endif /* !_SYS_CDEFS_H_ */ 725