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