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