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