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 #ifdef lint 163 #define __dead2 164 #define __pure 165 #define __pure2 166 #define __unused 167 #define __packed 168 #define __aligned(x) 169 #define __alloc_align(x) 170 #define __alloc_size(x) 171 #define __alloc_size2(n, x) 172 #define __section(x) 173 #define __always_inline 174 #define __nonnull(...) 175 #define __heedresult 176 #define __malloclike 177 #define __returns_twice 178 #define __weak_symbol 179 180 #define __read_mostly 181 #define __read_frequently 182 #define __exclusive_cache_line 183 184 #else 185 186 #define __weak_symbol __attribute__((__weak__)) 187 #if __GNUC_PREREQ__(2, 7) 188 #define __dead2 __attribute__((__noreturn__)) 189 #define __pure2 __attribute__((__const__)) 190 #define __unused __attribute__((__unused__)) 191 #define __packed __attribute__((__packed__)) 192 #define __aligned(x) __attribute__((__aligned__(x))) 193 #define __section(x) __attribute__((__section__(x))) 194 #define __read_mostly __section(".data.read_mostly") 195 #define __read_frequently __section(".data.read_frequently") 196 #define __exclusive_cache_line __aligned(__VM_CACHELINE_SIZE) \ 197 __section(".data.exclusive_cache_line") 198 199 #else 200 #define __dead2 201 #define __pure2 202 #define __unused 203 #endif 204 205 #if __GNUC_PREREQ__(2, 96) 206 #define __malloclike __attribute__((__malloc__)) 207 #define __pure __attribute__((__pure__)) 208 #else 209 #define __malloclike 210 #define __pure __pure2 211 #endif 212 213 #if __GNUC_PREREQ__(3, 1) 214 #define __always_inline __attribute__((__always_inline__)) 215 #define __noinline __attribute__((__noinline__)) 216 #else 217 #define __always_inline 218 #define __noinline 219 #endif 220 221 #if __GNUC_PREREQ__(3, 3) 222 #define __nonnull(...) __attribute__((__nonnull__(__VA_ARGS__))) 223 #define __used __attribute__((__used__)) 224 #else 225 #define __nonnull(...) 226 #define __used __unused 227 #endif 228 229 #if __GNUC_PREREQ__(3, 4) 230 #define __heedresult __attribute__((__warn_unused_result__)) 231 #else 232 #define __heedresult 233 #endif 234 235 #if __GNUC_PREREQ__(4, 1) 236 #define __returns_twice __attribute__((__returns_twice__)) 237 #else 238 #define __returns_twice 239 #endif 240 241 #if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__) 242 #define __alloc_size(x) __attribute__((__alloc_size__(x))) 243 #define __alloc_size2(n, x) __attribute__((__alloc_size__(n, x))) 244 #else 245 #define __alloc_size(x) 246 #define __alloc_size2(n, x) 247 #endif 248 249 #if __GNUC_PREREQ__(4, 9) || __has_attribute(__alloc_align__) 250 #define __alloc_align(x) __attribute__((__alloc_align__(x))) 251 #else 252 #define __alloc_align(x) 253 #endif 254 255 #endif /* LINT */ 256 257 #if !__GNUC_PREREQ__(2, 7) && __STDC_VERSION__ < 199901 258 #define __func__ NULL 259 #endif 260 261 #if (__GNUC_PREREQ__(2, 0) && !defined(__STRICT_ANSI__)) || \ 262 __STDC_VERSION__ >= 199901 263 #define __LONG_LONG_SUPPORTED 264 #endif 265 266 /* C++11 exposes a load of C99 stuff */ 267 #if defined(__cplusplus) && __cplusplus >= 201103L 268 #define __LONG_LONG_SUPPORTED 269 #ifndef __STDC_LIMIT_MACROS 270 #define __STDC_LIMIT_MACROS 271 #endif 272 #ifndef __STDC_CONSTANT_MACROS 273 #define __STDC_CONSTANT_MACROS 274 #endif 275 #endif 276 277 /* 278 * GCC 2.95 and later provides `__restrict' as an extension to C90 to support 279 * the C99-specific `restrict' type qualifier. We happen to use `__restrict' 280 * as a way to define the `restrict' type qualifier without disturbing older 281 * software that is unaware of C99 keywords. 282 */ 283 #if !__GNUC_PREREQ__(2, 95) 284 #if __STDC_VERSION__ < 199901 285 #define __restrict 286 #else 287 #define __restrict restrict 288 #endif 289 #endif 290 291 /* 292 * C99 allows to declare arrays as non-overlapping. 293 */ 294 #if __GNUC_PREREQ__(3, 1) && !defined(__GNUG__) 295 #define __restrict_arr __restrict 296 #else 297 #ifdef __GNUC__ 298 #define __restrict_arr 299 #else 300 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901 301 #define __restrict_arr restrict 302 #else 303 #define __restrict_arr 304 #endif 305 #endif 306 #endif 307 308 /* 309 * GNU C version 2.96 adds explicit branch prediction so that 310 * the CPU back-end can hint the processor and also so that 311 * code blocks can be reordered such that the predicted path 312 * sees a more linear flow, thus improving cache behavior, etc. 313 * 314 * The following two macros provide us with a way to utilize this 315 * compiler feature. Use __predict_true() if you expect the expression 316 * to evaluate to true, and __predict_false() if you expect the 317 * expression to evaluate to false. 318 * 319 * A few notes about usage: 320 * 321 * * Generally, __predict_false() error condition checks (unless 322 * you have some _strong_ reason to do otherwise, in which case 323 * document it), and/or __predict_true() `no-error' condition 324 * checks, assuming you want to optimize for the no-error case. 325 * 326 * * Other than that, if you don't know the likelihood of a test 327 * succeeding from empirical or other `hard' evidence, don't 328 * make predictions. 329 * 330 * * These are meant to be used in places that are run `a lot'. 331 * It is wasteful to make predictions in code that is run 332 * seldomly (e.g. at subsystem initialization time) as the 333 * basic block reordering that this affects can often generate 334 * larger code. 335 */ 336 #if __GNUC_PREREQ__(2, 96) 337 #define __predict_true(exp) __builtin_expect((exp), 1) 338 #define __predict_false(exp) __builtin_expect((exp), 0) 339 #else 340 #define __predict_true(exp) (exp) 341 #define __predict_false(exp) (exp) 342 #endif 343 344 /* 345 * Compiler-dependent macros to declare that functions take printf-like 346 * or scanf-like arguments. They are null except for versions of gcc 347 * that are known to support the features properly (old versions of gcc-2 348 * didn't permit keeping the keywords out of the application namespace). 349 * 350 * The printf0like macro for GCC 2 uses DragonFly specific compiler extensions. 351 */ 352 #if !__GNUC_PREREQ__(2, 7) 353 #define __printflike(fmtarg, firstvararg) 354 #define __scanflike(fmtarg, firstvararg) 355 #define __printf0like(fmtarg, firstvararg) 356 #define __format_arg(fmtarg) 357 #define __strfmonlike(fmtarg, firstvararg) 358 #define __strftimelike(fmtarg, firstvararg) 359 360 #elif __GNUC_PREREQ__(3, 0) 361 #define __printflike(fmtarg, firstvararg) \ 362 __attribute__((__nonnull__(fmtarg), \ 363 __format__ (__printf__, fmtarg, firstvararg))) 364 #define __printf0like(fmtarg, firstvararg) \ 365 __attribute__((__format__ (__printf__, fmtarg, firstvararg))) 366 #define __scanflike(fmtarg, firstvararg) \ 367 __attribute__((__format__ (__scanf__, fmtarg, firstvararg))) 368 #define __format_arg(fmtarg) \ 369 __attribute__((__format_arg__ (fmtarg))) 370 #define __strfmonlike(fmtarg, firstvararg) \ 371 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg))) 372 #define __strftimelike(fmtarg, firstvararg) \ 373 __attribute__((__format__ (__strftime__, fmtarg, firstvararg))) 374 375 #else 376 #define __printflike(fmtarg, firstvararg) \ 377 __attribute__((__format__ (__printf__, fmtarg, firstvararg))) 378 #define __printf0like(fmtarg, firstvararg) \ 379 __attribute__((__format__ (__printf0__, fmtarg, firstvararg))) 380 #define __scanflike(fmtarg, firstvararg) \ 381 __attribute__((__format__ (__scanf__, fmtarg, firstvararg))) 382 #define __format_arg(fmtarg) \ 383 __attribute__((__format_arg__ (fmtarg))) 384 #define __strfmonlike(fmtarg, firstvararg) \ 385 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg))) 386 #define __strftimelike(fmtarg, firstvararg) \ 387 __attribute__((__format__ (__strftime__, fmtarg, firstvararg))) 388 #endif 389 390 #if !__GNUC_PREREQ__(3, 0) 391 #define __ARRAY_ZERO 0 392 #else 393 #define __ARRAY_ZERO 394 #endif 395 396 #if __GNUC_PREREQ__(4, 0) 397 #define __dso_public __attribute__((__visibility__("default"))) 398 #define __dso_hidden __attribute__((__visibility__("hidden"))) 399 #else 400 #define __dso_public 401 #define __dso_hidden 402 #endif 403 404 /* 405 * A convenient constructor macro, GCC 4.3.0 added priority support to 406 * constructors, provide a compatible interface for both. 407 */ 408 #if __GNUC_PREREQ__(4, 3) 409 #define __constructor(prio) __attribute__((constructor(prio))) 410 #else 411 #define __constructor(prio) __attribute__((constructor)) 412 #endif 413 414 /* 415 * Handy GCC based macros: 416 * 417 * __cachealign: 418 * 419 * The __cachealign macro can be used for cache line aligning structures 420 * of small to medium size. It aligns the particular structure or 421 * storage type to a system default cache line alignment, thus giving us 422 * a much more better cache utilization by making the hardware work at 423 * its best burst speeds. 424 * 425 * __usereg: 426 * 427 * The __usereg macro can/should be used when a function contains 428 * arguments not more than 3. It can be very useful to us due to the 429 * message-passing nature of the kernel. 430 * 431 * !!NOTE - USAGE INFORMATION!! 432 * 433 * The __cachealign macro should not be used for data structures that are 434 * as big struct proc, struct vnode, struct thread, and other structs which 435 * are as big as them; simply because it will be useless in that case. 436 * 437 * The __usereg macro should be used whenever possible, i.e., when a function 438 * does not exceed more than 3 arguments, and should not be used for vararg 439 * type functions. 440 * 441 * In other words, AVOID MISUSE OF THESE MACROS. :-) 442 */ 443 #ifdef __GNUC__ 444 #define __cachealign __attribute__((__aligned__(__VM_CACHELINE_SIZE))) 445 #define __usereg __attribute__((__regparm__(3))) 446 #else 447 #define __cachealign 448 #define __usereg 449 #endif 450 451 #ifdef __GNUC__ 452 #define __strong_reference(sym,aliassym) \ 453 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym))) 454 #define __weak_reference(sym,aliassym) \ 455 __strong_reference(sym,aliassym) __attribute__ ((__weak__)) 456 #define __weak_reference_asm(sym,alias) \ 457 __asm__(".weak " #alias); \ 458 __asm__(".equ " #alias ", " #sym) 459 #define __warn_references(sym,msg) \ 460 __asm__(".section .gnu.warning." #sym); \ 461 __asm__(".asciz \"" msg "\""); \ 462 __asm__(".previous") 463 #endif /* __GNUC__ */ 464 465 #if defined(__GNUC__) 466 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"") 467 #endif 468 469 #ifndef __RCSID 470 #define __RCSID(s) struct __hack 471 #endif 472 473 #ifndef __RCSID_SOURCE 474 #define __RCSID_SOURCE(s) struct __hack 475 #endif 476 477 #ifndef __SCCSID 478 #define __SCCSID(s) struct __hack 479 #endif 480 481 #ifndef __FBSDID 482 #define __FBSDID(s) struct __hack 483 #endif 484 485 #ifndef __COPYRIGHT 486 #define __COPYRIGHT(s) struct __hack 487 #endif 488 489 #ifndef __DECONST 490 #define __DECONST(type, var) ((type)(uintptr_t)(const void *)(var)) 491 #endif 492 493 #ifndef __DEVOLATILE 494 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var)) 495 #endif 496 497 #ifndef __DEQUALIFY 498 #define __DEQUALIFY(type, var) ((type)(uintptr_t)(const volatile void *)(var)) 499 #endif 500 501 /* 502 * Keywords added in C11. 503 */ 504 505 #if !__GNUC_PREREQ__(2, 95) 506 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b) 507 #endif 508 509 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L 510 511 #if !__has_extension(c_alignas) 512 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \ 513 __has_extension(cxx_alignas) 514 #define _Alignas(x) alignas(x) 515 #else 516 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */ 517 #define _Alignas(x) __aligned(x) 518 #endif 519 #endif 520 521 #if defined(__cplusplus) && __cplusplus >= 201103L 522 #define _Alignof(x) alignof(x) 523 #else 524 #define _Alignof(x) __alignof(x) 525 #endif 526 527 #if !defined(_Noreturn) 528 #define _Noreturn __dead2 529 #endif 530 531 #if !__has_extension(c_static_assert) 532 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \ 533 __has_extension(cxx_static_assert) 534 #define _Static_assert(x, y) static_assert(x, y) 535 #elif !__GNUC_PREREQ__(4, 6) 536 #define _Static_assert(x, y) struct __hack 537 #ifdef _KERNEL 538 #define CTASSERT(x) _CTASSERT(x, __LINE__) 539 #define _CTASSERT(x, y) __CTASSERT(x, y) 540 #define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1] 541 #endif 542 #endif 543 #endif 544 545 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */ 546 547 #if defined(_KERNEL) && !defined(CTASSERT) 548 #define CTASSERT(x) _Static_assert(x, \ 549 "compile-time assertion failed") 550 #endif 551 552 /* 553 * Emulation of C11 _Generic(). Unlike the previously defined C11 554 * keywords, it is not possible to implement this using exactly the same 555 * syntax. Therefore implement something similar under the name 556 * __generic(). Unlike _Generic(), this macro can only distinguish 557 * between a single type, so it requires nested invocations to 558 * distinguish multiple cases. 559 */ 560 561 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L 562 #define __generic(expr, t, yes, no) \ 563 _Generic(expr, t: yes, default: no) 564 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus) 565 #define __generic(expr, t, yes, no) \ 566 __builtin_choose_expr( \ 567 __builtin_types_compatible_p(__typeof(expr), t), yes, no) 568 #endif 569 570 /*- 571 * POSIX.1 requires that the macros we test be defined before any standard 572 * header file is included. 573 * 574 * Here's a quick run-down of the versions: 575 * defined(_POSIX_SOURCE) 1003.1-1988 576 * _POSIX_C_SOURCE == 1 1003.1-1990 577 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option 578 * _POSIX_C_SOURCE == 199309 1003.1b-1993 579 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995, 580 * and the omnibus ISO/IEC 9945-1: 1996 581 * _POSIX_C_SOURCE == 200112 1003.1-2001 582 * _POSIX_C_SOURCE == 200809 1003.1-2008 583 * 584 * In addition, the X/Open Portability Guide, which is now the Single UNIX 585 * Specification, defines a feature-test macro which indicates the version of 586 * that specification, and which subsumes _POSIX_C_SOURCE. 587 * 588 * Our macros begin with two underscores to avoid namespace screwage. 589 */ 590 591 /* 592 * If no special macro was specified, make the DragonFly extensions 593 * available. Also make them available when requested so. 594 */ 595 #if (!defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE) && \ 596 !defined(_ANSI_SOURCE) && !defined(_C99_SOURCE)) || \ 597 defined(_DRAGONFLY_SOURCE) || defined(_NETBSD_SOURCE) 598 #define __DF_VISIBLE 1 599 #else 600 #define __DF_VISIBLE 0 601 #endif 602 603 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */ 604 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 1 605 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */ 606 #define _POSIX_C_SOURCE 199009 607 #endif 608 609 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */ 610 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 2 611 #undef _POSIX_C_SOURCE 612 #define _POSIX_C_SOURCE 199209 613 #endif 614 615 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */ 616 #ifdef _XOPEN_SOURCE 617 #if _XOPEN_SOURCE - 0 >= 700 618 #define __XSI_VISIBLE 700 619 #undef _POSIX_C_SOURCE 620 #define _POSIX_C_SOURCE 200809 621 #elif _XOPEN_SOURCE - 0 >= 600 622 #define __XSI_VISIBLE 600 623 #undef _POSIX_C_SOURCE 624 #define _POSIX_C_SOURCE 200112 625 #elif _XOPEN_SOURCE - 0 >= 500 626 #define __XSI_VISIBLE 500 627 #undef _POSIX_C_SOURCE 628 #define _POSIX_C_SOURCE 199506 629 #endif 630 #endif 631 632 /* 633 * Deal with all versions of POSIX. The ordering relative to the tests above is 634 * important. 635 */ 636 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) 637 #define _POSIX_C_SOURCE 198808 638 #endif 639 #ifdef _POSIX_C_SOURCE 640 #if (_POSIX_C_SOURCE - 0) >= 200809 641 #define __POSIX_VISIBLE 200809 642 #define __ISO_C_VISIBLE 1999 643 #elif (_POSIX_C_SOURCE - 0) >= 200112 644 #define __POSIX_VISIBLE 200112 645 #define __ISO_C_VISIBLE 1999 646 #elif (_POSIX_C_SOURCE - 0) >= 199506 647 #define __POSIX_VISIBLE 199506 648 #define __ISO_C_VISIBLE 1990 649 #elif (_POSIX_C_SOURCE - 0) >= 199309 650 #define __POSIX_VISIBLE 199309 651 #define __ISO_C_VISIBLE 1990 652 #elif (_POSIX_C_SOURCE - 0) >= 199209 653 #define __POSIX_VISIBLE 199209 654 #define __ISO_C_VISIBLE 1990 655 #elif (_POSIX_C_SOURCE - 0) >= 199009 656 #define __POSIX_VISIBLE 199009 657 #define __ISO_C_VISIBLE 1990 658 #else 659 #define __POSIX_VISIBLE 198808 660 #define __ISO_C_VISIBLE 0 661 #endif /* _POSIX_C_SOURCE */ 662 #else 663 /*- 664 * Deal with _ANSI_SOURCE: 665 * If it is defined, and no other compilation environment is explicitly 666 * requested, then define our internal feature-test macros to zero. This 667 * makes no difference to the preprocessor (undefined symbols in preprocessing 668 * expressions are defined to have value zero), but makes it more convenient for 669 * a test program to print out the values. 670 * 671 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as 672 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation 673 * environment (and in fact we will never get here). 674 */ 675 #if defined(_ANSI_SOURCE) /* Hide almost everything. */ 676 #define __POSIX_VISIBLE 0 677 #define __XSI_VISIBLE 0 678 #define __BSD_VISIBLE 0 679 #define __ISO_C_VISIBLE 1990 680 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */ 681 #define __POSIX_VISIBLE 0 682 #define __XSI_VISIBLE 0 683 #define __BSD_VISIBLE 0 684 #define __ISO_C_VISIBLE 1999 685 #elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */ 686 #define __POSIX_VISIBLE 0 687 #define __XSI_VISIBLE 0 688 #define __BSD_VISIBLE 0 689 #define __ISO_C_VISIBLE 2011 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 #endif 696 #endif 697 698 /* 699 * GLOBL macro exists to preserve __start_set_* and __stop_set_* sections 700 * of kernel modules which are discarded from binutils 2.17.50+ otherwise. 701 */ 702 703 #define __GLOBL1(sym) __asm__(".globl " #sym) 704 #define __GLOBL(sym) __GLOBL1(sym) 705 706 #endif /* !_SYS_CDEFS_H_ */ 707