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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)cdefs.h 8.8 (Berkeley) 1/9/95 37 * $FreeBSD: src/sys/sys/cdefs.h,v 1.28.2.8 2002/09/18 04:05:13 mikeh Exp $ 38 */ 39 40 #ifndef _SYS_CDEFS_H_ 41 #define _SYS_CDEFS_H_ 42 43 /* 44 * Testing against Clang-specific extensions. 45 */ 46 47 #ifndef __has_extension 48 #define __has_extension __has_feature 49 #endif 50 #ifndef __has_feature 51 #define __has_feature(x) 0 52 #endif 53 #ifndef __has_include 54 #define __has_include(x) 0 55 #endif 56 #ifndef __has_builtin 57 #define __has_builtin(x) 0 58 #endif 59 60 /* 61 * Macro to test if we are using a specific version of gcc or later. 62 */ 63 #if defined(__GNUC__) && !defined(__INTEL_COMPILER) 64 #define __GNUC_PREREQ__(ma, mi) \ 65 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi)) 66 #else 67 #define __GNUC_PREREQ__(ma, mi) 0 68 #endif 69 70 #if defined(__cplusplus) 71 #if __GNUC_PREREQ__(4, 0) 72 #define __BEGIN_DECLS _Pragma("GCC visibility push(default)") extern "C" { 73 #define __END_DECLS } _Pragma("GCC visibility pop") 74 #else 75 #define __BEGIN_DECLS extern "C" { 76 #define __END_DECLS } 77 #endif 78 #else 79 #define __BEGIN_DECLS 80 #define __END_DECLS 81 #endif 82 83 /* 84 * The __VM_CACHELINE_SIZE macro defines the common cache line alignment 85 * size that can be found across most recent and somewhat latest Intel 86 * hardware, i.e. L1 cache sizes etc. 87 * 88 * If needed, this value can be TUNED. Suitable values for this macro 89 * are 32, 64 and 128 bytes. The unit of measurement for this macro is 90 * bytes. 91 * 92 * XXX: This macro and related macros will eventually move to a MD 93 * header, but currently, we do need such a hierarchy. 94 */ 95 #define __VM_CACHELINE_SIZE 64 96 #define __VM_CACHELINE_MASK (__VM_CACHELINE_SIZE - 1) 97 #define __VM_CACHELINE_ALIGN(n) \ 98 (((n) + __VM_CACHELINE_MASK) & ~__VM_CACHELINE_MASK) 99 100 /* 101 * The __CONCAT macro is used to concatenate parts of symbol names, e.g. 102 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo. 103 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI 104 * mode -- there must be no spaces between its arguments, and for nested 105 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also 106 * concatenate double-quoted strings produced by the __STRING macro, but 107 * this only works with ANSI C. 108 * 109 * __XSTRING is like __STRING, but it expands any macros in its argument 110 * first. It is only available with ANSI C. 111 */ 112 #if defined(__STDC__) || defined(__cplusplus) 113 #define __P(protos) protos /* full-blown ANSI C */ 114 #define __CONCAT1(x,y) x ## y 115 #define __CONCAT(x,y) __CONCAT1(x,y) 116 #define __STRING(x) #x /* stringify without expanding x */ 117 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */ 118 119 #define __const const /* define reserved names to standard */ 120 #define __signed signed 121 #define __volatile volatile 122 #if defined(__cplusplus) 123 #define __inline inline /* convert to C++ keyword */ 124 #else 125 #ifndef __GNUC__ 126 #define __inline /* delete GCC keyword */ 127 #endif /* !__GNUC__ */ 128 #endif /* !__cplusplus */ 129 130 #else /* !(__STDC__ || __cplusplus) */ 131 #define __P(protos) () /* traditional C preprocessor */ 132 #define __CONCAT(x,y) x/**/y 133 #define __STRING(x) "x" 134 135 #ifndef __GNUC__ 136 #define __const /* delete pseudo-ANSI C keywords */ 137 #define __inline 138 #define __signed 139 #define __volatile 140 /* 141 * In non-ANSI C environments, new programs will want ANSI-only C keywords 142 * deleted from the program and old programs will want them left alone. 143 * When using a compiler other than gcc, programs using the ANSI C keywords 144 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS. 145 * When using "gcc -traditional", we assume that this is the intent; if 146 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone. 147 */ 148 #ifndef NO_ANSI_KEYWORDS 149 #define const /* delete ANSI C keywords */ 150 #define inline 151 #define signed 152 #define volatile 153 #endif /* !NO_ANSI_KEYWORDS */ 154 #endif /* !__GNUC__ */ 155 #endif /* !(__STDC__ || __cplusplus) */ 156 157 /* 158 * Compiler-dependent macros to help declare dead (non-returning) and 159 * pure (no side effects) functions, and unused variables. They are 160 * null except for versions of gcc that are known to support the features 161 * properly (old versions of gcc-2 supported the dead and pure features 162 * in a different (wrong) way). 163 */ 164 #ifdef lint 165 166 #define __dead2 167 #define __pure 168 #define __pure2 169 #define __unused 170 #define __packed 171 #define __aligned(x) 172 #define __section(x) 173 #define __always_inline 174 #define __nonnull(x) 175 #define __heedresult 176 #define __returns_twice 177 178 #else 179 180 #if !__GNUC_PREREQ__(2, 7) 181 #define __dead2 182 #define __pure2 183 #define __unused 184 #endif 185 186 #if __GNUC_PREREQ__(2, 7) 187 #define __dead2 __attribute__((__noreturn__)) 188 #define __pure2 __attribute__((__const__)) 189 #define __unused __attribute__((__unused__)) 190 #define __packed __attribute__((__packed__)) 191 #define __aligned(x) __attribute__((__aligned__(x))) 192 #define __section(x) __attribute__((__section__(x))) 193 #endif 194 195 #if __GNUC_PREREQ__(2, 96) 196 #define __pure __attribute__((__pure__)) 197 #else 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 __heedresult __attribute__((__warn_unused_result__)) 211 #define __nonnull(x) __attribute__((__nonnull__(x))) 212 #define __used __attribute__((__used__)) 213 #else 214 #define __heedresult 215 #define __nonnull(x) 216 #define __used __unused 217 #endif 218 219 #if __GNUC_PREREQ__(4, 1) 220 #define __returns_twice __attribute__((__returns_twice__)) 221 #else 222 #define __returns_twice 223 #endif 224 225 #endif /* LINT */ 226 227 #if !__GNUC_PREREQ__(2, 7) && __STDC_VERSION < 199901 228 #define __func__ NULL 229 #endif 230 231 #if (__GNUC_PREREQ__(2, 0) && !defined(__STRICT_ANSI__)) || \ 232 __STDC_VERSION__ >= 199901 233 #define __LONG_LONG_SUPPORTED 234 #endif 235 236 /* C++11 exposes a load of C99 stuff */ 237 #if defined(__cplusplus) && __cplusplus >= 201103L 238 #define __LONG_LONG_SUPPORTED 239 #ifndef __STDC_LIMIT_MACROS 240 #define __STDC_LIMIT_MACROS 241 #endif 242 #ifndef __STDC_CONSTANT_MACROS 243 #define __STDC_CONSTANT_MACROS 244 #endif 245 #endif 246 247 /* 248 * GNU C version 2.96 adds explicit branch prediction so that 249 * the CPU back-end can hint the processor and also so that 250 * code blocks can be reordered such that the predicted path 251 * sees a more linear flow, thus improving cache behavior, etc. 252 * 253 * The following two macros provide us with a way to utilize this 254 * compiler feature. Use __predict_true() if you expect the expression 255 * to evaluate to true, and __predict_false() if you expect the 256 * expression to evaluate to false. 257 * 258 * A few notes about usage: 259 * 260 * * Generally, __predict_false() error condition checks (unless 261 * you have some _strong_ reason to do otherwise, in which case 262 * document it), and/or __predict_true() `no-error' condition 263 * checks, assuming you want to optimize for the no-error case. 264 * 265 * * Other than that, if you don't know the likelihood of a test 266 * succeeding from empirical or other `hard' evidence, don't 267 * make predictions. 268 * 269 * * These are meant to be used in places that are run `a lot'. 270 * It is wasteful to make predictions in code that is run 271 * seldomly (e.g. at subsystem initialization time) as the 272 * basic block reordering that this affects can often generate 273 * larger code. 274 */ 275 #if __GNUC_PREREQ__(2, 96) 276 #define __predict_true(exp) __builtin_expect((exp), 1) 277 #define __predict_false(exp) __builtin_expect((exp), 0) 278 #else 279 #define __predict_true(exp) (exp) 280 #define __predict_false(exp) (exp) 281 #endif 282 283 /* 284 * GCC 2.95 and later provides `__restrict' as an extention to C90 to support 285 * the C99-specific `restrict' type qualifier. We happen to use `__restrict' 286 * as a way to define the `restrict' type qualifier without disturbing older 287 * software that is unaware of C99 keywords. 288 */ 289 #if !__GNUC_PREREQ__(2, 95) 290 #if __STDC_VERSION__ < 199901 291 #define __restrict 292 #else 293 #define __restrict restrict 294 #endif 295 #endif 296 297 /* 298 * Compiler-dependent macros to declare that functions take printf-like 299 * or scanf-like arguments. They are null except for versions of gcc 300 * that are known to support the features properly (old versions of gcc-2 301 * didn't permit keeping the keywords out of the application namespace). 302 * 303 * The printf0like macro for GCC 2 uses DragonFly specific compiler extensions. 304 */ 305 #if !__GNUC_PREREQ__(2, 7) 306 #define __printflike(fmtarg, firstvararg) 307 #define __scanflike(fmtarg, firstvararg) 308 #define __printf0like(fmtarg, firstvararg) 309 #define __format_arg(fmtarg) 310 #define __strfmonlike(fmtarg, firstvararg) 311 #define __strftimelike(fmtarg, firstvararg) 312 313 #elif __GNUC_PREREQ__(3, 0) 314 #define __printflike(fmtarg, firstvararg) \ 315 __attribute__((__nonnull__(fmtarg), \ 316 __format__ (__printf__, fmtarg, firstvararg))) 317 #define __printf0like(fmtarg, firstvararg) \ 318 __attribute__((__format__ (__printf__, fmtarg, firstvararg))) 319 #define __scanflike(fmtarg, firstvararg) \ 320 __attribute__((__format__ (__scanf__, fmtarg, firstvararg))) 321 #define __format_arg(fmtarg) \ 322 __attribute__((__format_arg__ (fmtarg))) 323 #define __strfmonlike(fmtarg, firstvararg) \ 324 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg))) 325 #define __strftimelike(fmtarg, firstvararg) \ 326 __attribute__((__format__ (__strftime__, fmtarg, firstvararg))) 327 328 #else 329 #define __printflike(fmtarg, firstvararg) \ 330 __attribute__((__format__ (__printf__, fmtarg, firstvararg))) 331 #define __printf0like(fmtarg, firstvararg) \ 332 __attribute__((__format__ (__printf0__, fmtarg, firstvararg))) 333 #define __scanflike(fmtarg, firstvararg) \ 334 __attribute__((__format__ (__scanf__, fmtarg, firstvararg))) 335 #define __format_arg(fmtarg) \ 336 __attribute__((__format_arg__ (fmtarg))) 337 #define __strfmonlike(fmtarg, firstvararg) \ 338 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg))) 339 #define __strftimelike(fmtarg, firstvararg) \ 340 __attribute__((__format__ (__strftime__, fmtarg, firstvararg))) 341 342 #endif 343 344 #if !__GNUC_PREREQ__(3, 0) 345 #define __ARRAY_ZERO 0 346 #else 347 #define __ARRAY_ZERO 348 #endif 349 350 #if __GNUC_PREREQ__(4, 0) 351 #define __dso_public __attribute__((__visibility__("default"))) 352 #define __dso_hidden __attribute__((__visibility__("hidden"))) 353 #else 354 #define __dso_public 355 #define __dso_hidden 356 #endif 357 358 /* 359 * A convenient constructor macro, GCC 4.3.0 added priority support to 360 * constructors, provide a compatible interface for both. 361 */ 362 #if __GNUC_PREREQ__(4, 3) 363 #define __constructor(prio) __attribute__((constructor(prio))) 364 #else 365 #define __constructor(prio) __attribute__((constructor)) 366 #endif 367 368 /* 369 * Handy GCC based macros: 370 * 371 * __cachealign: 372 * 373 * The __cachealign macro can be used for cache line aligning structures 374 * of small to medium size. It aligns the particular structure or 375 * storage type to a system default cache line alignment, thus giving us 376 * a much more better cache utilization by making the hardware work at 377 * its best burst speeds. 378 * 379 * __usereg: 380 * 381 * The __usereg macro can/should be used when a function contains 382 * arguments not more than 3. It can be very useful to us due to the 383 * message-passing nature of the kernel. 384 * 385 * !!NOTE - USAGE INFORMATION!! 386 * 387 * The __cachealign macro should not be used for data structures that are 388 * as big struct proc, struct vnode, struct thread, and other structs which 389 * are as big as them; simply because it will be useless in that case. 390 * 391 * The __usereg macro should be used whenever possible, i.e., when a function 392 * does not exceed more than 3 arguments, and should not be used for vararg 393 * type functions. 394 * 395 * In other words, AVOID MISUSE OF THESE MACROS. :-) 396 */ 397 #ifdef __GNUC__ 398 #define __cachealign __attribute__((__aligned__(__VM_CACHELINE_SIZE))) 399 #define __usereg __attribute__((__regparm__(3))) 400 #else 401 #define __cachealign 402 #define __usereg 403 #endif 404 405 #ifdef __GNUC__ 406 #define __strong_reference(sym,aliassym) \ 407 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym))); 408 #define __weak_reference(sym,alias) \ 409 __asm__(".weak " #alias); \ 410 __asm__(".equ " #alias ", " #sym) 411 #define __warn_references(sym,msg) \ 412 __asm__(".section .gnu.warning." #sym); \ 413 __asm__(".asciz \"" msg "\""); \ 414 __asm__(".previous") 415 #endif /* __GNUC__ */ 416 417 #if defined(__GNUC__) 418 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"") 419 #endif 420 421 #ifndef __RCSID 422 #define __RCSID(s) __IDSTRING(rcsid,s) 423 #endif 424 425 #ifndef __RCSID_SOURCE 426 #define __RCSID_SOURCE(s) __IDSTRING(rcsid_source,s) 427 #endif 428 429 #ifndef __COPYRIGHT 430 #define __COPYRIGHT(s) __IDSTRING(copyright,s) 431 #endif 432 433 #ifndef __DECONST 434 #define __DECONST(type, var) ((type)(uintptr_t)(const void *)(var)) 435 #endif 436 437 #ifndef __DEVOLATILE 438 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var)) 439 #endif 440 441 #ifndef __DEQUALIFY 442 #define __DEQUALIFY(type, var) ((type)(uintptr_t)(const volatile void *)(var)) 443 #endif 444 445 /* 446 * Keywords added in C11. 447 */ 448 449 #if !__GNUC_PREREQ__(2, 95) 450 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b) 451 #endif 452 453 /* 454 * Keywords added in C11. 455 */ 456 457 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L 458 459 #if !__has_extension(c_alignas) 460 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \ 461 __has_extension(cxx_alignas) 462 #define _Alignas(x) alignas(x) 463 #else 464 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */ 465 #define _Alignas(x) __aligned(x) 466 #endif 467 #endif 468 469 #if defined(__cplusplus) && __cplusplus >= 201103L 470 #define _Alignof(x) alignof(x) 471 #else 472 #define _Alignof(x) __alignof(x) 473 #endif 474 475 #define _Noreturn __dead2 476 477 #if !__has_extension(c_static_assert) 478 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \ 479 __has_extension(cxx_static_assert) 480 #define _Static_assert(x, y) static_assert(x, y) 481 #elif !__GNUC_PREREQ__(4, 6) 482 #define _Static_assert(x, y) struct __hack 483 #ifdef _KERNEL 484 #define CTASSERT(x) _CTASSERT(x, __LINE__) 485 #define _CTASSERT(x, y) __CTASSERT(x, y) 486 #define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1] 487 #endif 488 #endif 489 #endif 490 491 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */ 492 493 #if defined(_KERNEL) && !defined(CTASSERT) 494 #define CTASSERT(x) _Static_assert(x, \ 495 "compile-time assertion failed") 496 #endif 497 498 /* 499 * Emulation of C11 _Generic(). Unlike the previously defined C11 500 * keywords, it is not possible to implement this using exactly the same 501 * syntax. Therefore implement something similar under the name 502 * __generic(). Unlike _Generic(), this macro can only distinguish 503 * between a single type, so it requires nested invocations to 504 * distinguish multiple cases. 505 */ 506 507 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L 508 #define __generic(expr, t, yes, no) \ 509 _Generic(expr, t: yes, default: no) 510 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus) 511 #define __generic(expr, t, yes, no) \ 512 __builtin_choose_expr( \ 513 __builtin_types_compatible_p(__typeof(expr), t), yes, no) 514 #endif 515 516 /*- 517 * POSIX.1 requires that the macros we test be defined before any standard 518 * header file is included. 519 * 520 * Here's a quick run-down of the versions: 521 * defined(_POSIX_SOURCE) 1003.1-1988 522 * _POSIX_C_SOURCE == 1 1003.1-1990 523 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option 524 * _POSIX_C_SOURCE == 199309 1003.1b-1993 525 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995, 526 * and the omnibus ISO/IEC 9945-1: 1996 527 * _POSIX_C_SOURCE == 200112 1003.1-2001 528 * _POSIX_C_SOURCE == 200809 1003.1-2008 529 * 530 * In addition, the X/Open Portability Guide, which is now the Single UNIX 531 * Specification, defines a feature-test macro which indicates the version of 532 * that specification, and which subsumes _POSIX_C_SOURCE. 533 * 534 * Our macros begin with two underscores to avoid namespace screwage. 535 */ 536 537 /* 538 * If no special macro was specified, make the DragonFly extensions 539 * available. Also make them available when requested so. 540 */ 541 #if (!defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE) && \ 542 !defined(_ANSI_SOURCE) && !defined(_C99_SOURCE)) || \ 543 defined(_DRAGONFLY_SOURCE) || defined(_NETBSD_SOURCE) 544 #define __DF_VISIBLE 1 545 #else 546 #define __DF_VISIBLE 0 547 #endif 548 549 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */ 550 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 1 551 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */ 552 #define _POSIX_C_SOURCE 199009 553 #endif 554 555 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */ 556 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 2 557 #undef _POSIX_C_SOURCE 558 #define _POSIX_C_SOURCE 199209 559 #endif 560 561 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */ 562 #ifdef _XOPEN_SOURCE 563 #if _XOPEN_SOURCE - 0 >= 700 564 #define __XSI_VISIBLE 700 565 #undef _POSIX_C_SOURCE 566 #define _POSIX_C_SOURCE 200809 567 #elif _XOPEN_SOURCE - 0 >= 600 568 #define __XSI_VISIBLE 600 569 #undef _POSIX_C_SOURCE 570 #define _POSIX_C_SOURCE 200112 571 #elif _XOPEN_SOURCE - 0 >= 500 572 #define __XSI_VISIBLE 500 573 #undef _POSIX_C_SOURCE 574 #define _POSIX_C_SOURCE 199506 575 #endif 576 #endif 577 578 /* 579 * Deal with all versions of POSIX. The ordering relative to the tests above is 580 * important. 581 */ 582 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) 583 #define _POSIX_C_SOURCE 198808 584 #endif 585 #ifdef _POSIX_C_SOURCE 586 #if (_POSIX_C_SOURCE - 0) >= 200809 587 #define __POSIX_VISIBLE 200809 588 #define __ISO_C_VISIBLE 1999 589 #elif (_POSIX_C_SOURCE - 0) >= 200112 590 #define __POSIX_VISIBLE 200112 591 #define __ISO_C_VISIBLE 1999 592 #elif (_POSIX_C_SOURCE - 0) >= 199506 593 #define __POSIX_VISIBLE 199506 594 #define __ISO_C_VISIBLE 1990 595 #elif (_POSIX_C_SOURCE - 0) >= 199309 596 #define __POSIX_VISIBLE 199309 597 #define __ISO_C_VISIBLE 1990 598 #elif (_POSIX_C_SOURCE - 0) >= 199209 599 #define __POSIX_VISIBLE 199209 600 #define __ISO_C_VISIBLE 1990 601 #elif (_POSIX_C_SOURCE - 0) >= 199009 602 #define __POSIX_VISIBLE 199009 603 #define __ISO_C_VISIBLE 1990 604 #else 605 #define __POSIX_VISIBLE 198808 606 #define __ISO_C_VISIBLE 0 607 #endif /* _POSIX_C_SOURCE */ 608 #else 609 /*- 610 * Deal with _ANSI_SOURCE: 611 * If it is defined, and no other compilation environment is explicitly 612 * requested, then define our internal feature-test macros to zero. This 613 * makes no difference to the preprocessor (undefined symbols in preprocessing 614 * expressions are defined to have value zero), but makes it more convenient for 615 * a test program to print out the values. 616 * 617 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as 618 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation 619 * environment (and in fact we will never get here). 620 */ 621 #ifdef _ANSI_SOURCE /* Hide almost everything. */ 622 #define __POSIX_VISIBLE 0 623 #define __XSI_VISIBLE 0 624 #define __BSD_VISIBLE 0 625 #define __ISO_C_VISIBLE 1990 626 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */ 627 #define __POSIX_VISIBLE 0 628 #define __XSI_VISIBLE 0 629 #define __BSD_VISIBLE 0 630 #define __ISO_C_VISIBLE 1999 631 #elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */ 632 #define __POSIX_VISIBLE 0 633 #define __XSI_VISIBLE 0 634 #define __BSD_VISIBLE 0 635 #define __ISO_C_VISIBLE 2011 636 #else /* Default environment: show everything. */ 637 #define __POSIX_VISIBLE 200809 638 #define __XSI_VISIBLE 700 639 #define __BSD_VISIBLE 1 640 #define __ISO_C_VISIBLE 2011 641 #endif 642 #endif 643 644 /* 645 * GLOBL macro exists to preserve __start_set_* and __stop_set_* sections 646 * of kernel modules which are discarded from binutils 2.17.50+ otherwise. 647 */ 648 649 #define __GLOBL1(sym) __asm__(".globl " #sym) 650 #define __GLOBL(sym) __GLOBL1(sym) 651 652 /* 653 * Ignore the rcs id of a source file. 654 */ 655 656 #ifndef __FBSDID 657 #define __FBSDID(s) struct __hack 658 #endif 659 660 #ifndef __RCSID 661 #define __RCSID(s) struct __hack 662 #endif 663 664 #ifndef __RCSID_SOURCE 665 #define __RCSID_SOURCE(s) struct __hack 666 #endif 667 668 #ifndef __SCCSID 669 #define __SCCSID(s) struct __hack 670 #endif 671 672 #ifndef __COPYRIGHT 673 #define __COPYRIGHT(s) struct __hack 674 #endif 675 676 #endif /* !_SYS_CDEFS_H_ */ 677