FreeBSD/Linux Kernel Cross Reference
sys/sys/cdefs.h
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 * 4. 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 * $FreeBSD$
34 */
35
36 #ifndef _SYS_CDEFS_H_
37 #define _SYS_CDEFS_H_
38
39 #if defined(__cplusplus)
40 #define __BEGIN_DECLS extern "C" {
41 #define __END_DECLS }
42 #else
43 #define __BEGIN_DECLS
44 #define __END_DECLS
45 #endif
46
47 /*
48 * This code has been put in place to help reduce the addition of
49 * compiler specific defines in FreeBSD code. It helps to aid in
50 * having a compiler-agnostic source tree.
51 */
52
53 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
54
55 #if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
56 #define __GNUCLIKE_ASM 3
57 #define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
58 #else
59 #define __GNUCLIKE_ASM 2
60 #endif
61 #define __GNUCLIKE___TYPEOF 1
62 #define __GNUCLIKE___OFFSETOF 1
63 #define __GNUCLIKE___SECTION 1
64
65 #ifndef __INTEL_COMPILER
66 # define __GNUCLIKE_CTOR_SECTION_HANDLING 1
67 #endif
68
69 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
70 # if defined(__INTEL_COMPILER) && defined(__cplusplus) \
71 && __INTEL_COMPILER < 800
72 # undef __GNUCLIKE_BUILTIN_CONSTANT_P
73 # endif
74
75 #if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3)
76 # define __GNUCLIKE_BUILTIN_VARARGS 1
77 # define __GNUCLIKE_BUILTIN_STDARG 1
78 # define __GNUCLIKE_BUILTIN_VAALIST 1
79 #endif
80
81 #if defined(__GNUC__)
82 # define __GNUC_VA_LIST_COMPATIBILITY 1
83 #endif
84
85 /*
86 * Compiler memory barriers, specific to gcc and clang.
87 */
88 #if defined(__GNUC__)
89 #define __compiler_membar() __asm __volatile(" " : : : "memory")
90 #endif
91
92 #ifndef __INTEL_COMPILER
93 # define __GNUCLIKE_BUILTIN_NEXT_ARG 1
94 # define __GNUCLIKE_MATH_BUILTIN_RELOPS
95 #endif
96
97 #define __GNUCLIKE_BUILTIN_MEMCPY 1
98
99 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
100 #define __CC_SUPPORTS_INLINE 1
101 #define __CC_SUPPORTS___INLINE 1
102 #define __CC_SUPPORTS___INLINE__ 1
103
104 #define __CC_SUPPORTS___FUNC__ 1
105 #define __CC_SUPPORTS_WARNING 1
106
107 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
108
109 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
110
111 #endif /* __GNUC__ || __INTEL_COMPILER */
112
113 /*
114 * Macro to test if we're using a specific version of gcc or later.
115 */
116 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
117 #define __GNUC_PREREQ__(ma, mi) \
118 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
119 #else
120 #define __GNUC_PREREQ__(ma, mi) 0
121 #endif
122
123 /*
124 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
125 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
126 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
127 * mode -- there must be no spaces between its arguments, and for nested
128 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
129 * concatenate double-quoted strings produced by the __STRING macro, but
130 * this only works with ANSI C.
131 *
132 * __XSTRING is like __STRING, but it expands any macros in its argument
133 * first. It is only available with ANSI C.
134 */
135 #if defined(__STDC__) || defined(__cplusplus)
136 #define __P(protos) protos /* full-blown ANSI C */
137 #define __CONCAT1(x,y) x ## y
138 #define __CONCAT(x,y) __CONCAT1(x,y)
139 #define __STRING(x) #x /* stringify without expanding x */
140 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */
141
142 #define __const const /* define reserved names to standard */
143 #define __signed signed
144 #define __volatile volatile
145 #if defined(__cplusplus)
146 #define __inline inline /* convert to C++ keyword */
147 #else
148 #if !(defined(__CC_SUPPORTS___INLINE))
149 #define __inline /* delete GCC keyword */
150 #endif /* ! __CC_SUPPORTS___INLINE */
151 #endif /* !__cplusplus */
152
153 #else /* !(__STDC__ || __cplusplus) */
154 #define __P(protos) () /* traditional C preprocessor */
155 #define __CONCAT(x,y) x/**/y
156 #define __STRING(x) "x"
157
158 #if !defined(__CC_SUPPORTS___INLINE)
159 #define __const /* delete pseudo-ANSI C keywords */
160 #define __inline
161 #define __signed
162 #define __volatile
163 /*
164 * In non-ANSI C environments, new programs will want ANSI-only C keywords
165 * deleted from the program and old programs will want them left alone.
166 * When using a compiler other than gcc, programs using the ANSI C keywords
167 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
168 * When using "gcc -traditional", we assume that this is the intent; if
169 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
170 */
171 #ifndef NO_ANSI_KEYWORDS
172 #define const /* delete ANSI C keywords */
173 #define inline
174 #define signed
175 #define volatile
176 #endif /* !NO_ANSI_KEYWORDS */
177 #endif /* !__CC_SUPPORTS___INLINE */
178 #endif /* !(__STDC__ || __cplusplus) */
179
180 /*
181 * Compiler-dependent macros to help declare dead (non-returning) and
182 * pure (no side effects) functions, and unused variables. They are
183 * null except for versions of gcc that are known to support the features
184 * properly (old versions of gcc-2 supported the dead and pure features
185 * in a different (wrong) way). If we do not provide an implementation
186 * for a given compiler, let the compile fail if it is told to use
187 * a feature that we cannot live without.
188 */
189 #ifdef lint
190 #define __dead2
191 #define __pure2
192 #define __unused
193 #define __packed
194 #define __aligned(x)
195 #define __section(x)
196 #else
197 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
198 #define __dead2
199 #define __pure2
200 #define __unused
201 #endif
202 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
203 #define __dead2 __attribute__((__noreturn__))
204 #define __pure2 __attribute__((__const__))
205 #define __unused
206 /* XXX Find out what to do for __packed, __aligned and __section */
207 #endif
208 #if __GNUC_PREREQ__(2, 7)
209 #define __dead2 __attribute__((__noreturn__))
210 #define __pure2 __attribute__((__const__))
211 #define __unused __attribute__((__unused__))
212 #define __used __attribute__((__used__))
213 #define __packed __attribute__((__packed__))
214 #define __aligned(x) __attribute__((__aligned__(x)))
215 #define __section(x) __attribute__((__section__(x)))
216 #endif
217 #if defined(__INTEL_COMPILER)
218 #define __dead2 __attribute__((__noreturn__))
219 #define __pure2 __attribute__((__const__))
220 #define __unused __attribute__((__unused__))
221 #define __used __attribute__((__used__))
222 #define __packed __attribute__((__packed__))
223 #define __aligned(x) __attribute__((__aligned__(x)))
224 #define __section(x) __attribute__((__section__(x)))
225 #endif
226 #endif
227
228 #if !__GNUC_PREREQ__(2, 95)
229 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b)
230 #endif
231
232 /*
233 * Keywords added in C11.
234 */
235 #if defined(__cplusplus) && __cplusplus >= 201103L
236 #define _Alignas(e) alignas(e)
237 #define _Alignof(e) alignof(e)
238 #define _Noreturn [[noreturn]]
239 #define _Static_assert(e, s) static_assert(e, s)
240 /* FIXME: change this to thread_local when clang in base supports it */
241 #define _Thread_local __thread
242 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L && !defined(lint)
243 /* Do nothing. They are language keywords. */
244 #else
245 /* Not supported. Implement them using our versions. */
246 #define _Alignas(x) __aligned(x)
247 #define _Alignof(x) __alignof(x)
248 #define _Noreturn __dead2
249 #define _Thread_local __thread
250 #ifdef __COUNTER__
251 #define _Static_assert(x, y) __Static_assert(x, __COUNTER__)
252 #define __Static_assert(x, y) ___Static_assert(x, y)
253 #define ___Static_assert(x, y) typedef char __assert_ ## y[(x) ? 1 : -1] \
254 __unused
255 #else
256 #define _Static_assert(x, y) struct __hack
257 #endif
258 #endif
259
260 /*
261 * Emulation of C11 _Generic(). Unlike the previously defined C11
262 * keywords, it is not possible to implement this using exactly the same
263 * syntax. Therefore implement something similar under the name
264 * __generic(). Unlike _Generic(), this macro can only distinguish
265 * between a single type, so it requires nested invocations to
266 * distinguish multiple cases.
267 */
268
269 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
270 #define __generic(expr, t, yes, no) \
271 _Generic(expr, t: yes, default: no)
272 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
273 #define __generic(expr, t, yes, no) \
274 __builtin_choose_expr( \
275 __builtin_types_compatible_p(__typeof(expr), t), yes, no)
276 #endif
277
278 #if __GNUC_PREREQ__(2, 96)
279 #define __malloc_like __attribute__((__malloc__))
280 #define __pure __attribute__((__pure__))
281 #else
282 #define __malloc_like
283 #define __pure
284 #endif
285
286 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
287 #define __always_inline __attribute__((__always_inline__))
288 #else
289 #define __always_inline
290 #endif
291
292 #if __GNUC_PREREQ__(3, 1)
293 #define __noinline __attribute__ ((__noinline__))
294 #else
295 #define __noinline
296 #endif
297
298 #if __GNUC_PREREQ__(3, 3)
299 #define __nonnull(x) __attribute__((__nonnull__(x)))
300 #else
301 #define __nonnull(x)
302 #endif
303
304 #if __GNUC_PREREQ__(3, 4)
305 #define __fastcall __attribute__((__fastcall__))
306 #else
307 #define __fastcall
308 #endif
309
310 #if __GNUC_PREREQ__(4, 1)
311 #define __returns_twice __attribute__((__returns_twice__))
312 #else
313 #define __returns_twice
314 #endif
315
316 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
317 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
318 #define __func__ NULL
319 #endif
320
321 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
322 #define __LONG_LONG_SUPPORTED
323 #endif
324
325 /* C++11 exposes a load of C99 stuff */
326 #if defined(__cplusplus) && __cplusplus >= 201103L
327 #define __LONG_LONG_SUPPORTED
328 #ifndef __STDC_LIMIT_MACROS
329 #define __STDC_LIMIT_MACROS
330 #endif
331 #ifndef __STDC_CONSTANT_MACROS
332 #define __STDC_CONSTANT_MACROS
333 #endif
334 #endif
335
336 /*
337 * GCC 2.95 provides `__restrict' as an extension to C90 to support the
338 * C99-specific `restrict' type qualifier. We happen to use `__restrict' as
339 * a way to define the `restrict' type qualifier without disturbing older
340 * software that is unaware of C99 keywords.
341 */
342 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
343 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
344 #define __restrict
345 #else
346 #define __restrict restrict
347 #endif
348 #endif
349
350 /*
351 * GNU C version 2.96 adds explicit branch prediction so that
352 * the CPU back-end can hint the processor and also so that
353 * code blocks can be reordered such that the predicted path
354 * sees a more linear flow, thus improving cache behavior, etc.
355 *
356 * The following two macros provide us with a way to utilize this
357 * compiler feature. Use __predict_true() if you expect the expression
358 * to evaluate to true, and __predict_false() if you expect the
359 * expression to evaluate to false.
360 *
361 * A few notes about usage:
362 *
363 * * Generally, __predict_false() error condition checks (unless
364 * you have some _strong_ reason to do otherwise, in which case
365 * document it), and/or __predict_true() `no-error' condition
366 * checks, assuming you want to optimize for the no-error case.
367 *
368 * * Other than that, if you don't know the likelihood of a test
369 * succeeding from empirical or other `hard' evidence, don't
370 * make predictions.
371 *
372 * * These are meant to be used in places that are run `a lot'.
373 * It is wasteful to make predictions in code that is run
374 * seldomly (e.g. at subsystem initialization time) as the
375 * basic block reordering that this affects can often generate
376 * larger code.
377 */
378 #if __GNUC_PREREQ__(2, 96)
379 #define __predict_true(exp) __builtin_expect((exp), 1)
380 #define __predict_false(exp) __builtin_expect((exp), 0)
381 #else
382 #define __predict_true(exp) (exp)
383 #define __predict_false(exp) (exp)
384 #endif
385
386 #if __GNUC_PREREQ__(4, 2)
387 #define __hidden __attribute__((__visibility__("hidden")))
388 #define __exported __attribute__((__visibility__("default")))
389 #else
390 #define __hidden
391 #define __exported
392 #endif
393
394 /*
395 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
396 * require it.
397 */
398 #if __GNUC_PREREQ__(4, 1)
399 #define __offsetof(type, field) __builtin_offsetof(type, field)
400 #else
401 #ifndef __cplusplus
402 #define __offsetof(type, field) \
403 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
404 #else
405 #define __offsetof(type, field) \
406 (__offsetof__ (reinterpret_cast <__size_t> \
407 (&reinterpret_cast <const volatile char &> \
408 (static_cast<type *> (0)->field))))
409 #endif
410 #endif
411 #define __rangeof(type, start, end) \
412 (__offsetof(type, end) - __offsetof(type, start))
413
414 /*
415 * Given the pointer x to the member m of the struct s, return
416 * a pointer to the containing structure. When using GCC, we first
417 * assign pointer x to a local variable, to check that its type is
418 * compatible with member m.
419 */
420 #if __GNUC_PREREQ__(3, 1)
421 #define __containerof(x, s, m) ({ \
422 const volatile __typeof(((s *)0)->m) *__x = (x); \
423 __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
424 })
425 #else
426 #define __containerof(x, s, m) \
427 __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
428 #endif
429
430 /*
431 * Compiler-dependent macros to declare that functions take printf-like
432 * or scanf-like arguments. They are null except for versions of gcc
433 * that are known to support the features properly (old versions of gcc-2
434 * didn't permit keeping the keywords out of the application namespace).
435 */
436 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
437 #define __printflike(fmtarg, firstvararg)
438 #define __scanflike(fmtarg, firstvararg)
439 #define __format_arg(fmtarg)
440 #define __strfmonlike(fmtarg, firstvararg)
441 #define __strftimelike(fmtarg, firstvararg)
442 #else
443 #define __printflike(fmtarg, firstvararg) \
444 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
445 #define __scanflike(fmtarg, firstvararg) \
446 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
447 #define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg)))
448 #define __strfmonlike(fmtarg, firstvararg) \
449 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
450 #define __strftimelike(fmtarg, firstvararg) \
451 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
452 #endif
453
454 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
455 #if __FreeBSD_cc_version >= 300001 && defined(__GNUC__) && !defined(__INTEL_COMPILER)
456 #define __printf0like(fmtarg, firstvararg) \
457 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
458 #else
459 #define __printf0like(fmtarg, firstvararg)
460 #endif
461
462 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
463 #ifndef __INTEL_COMPILER
464 #define __strong_reference(sym,aliassym) \
465 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
466 #endif
467 #ifdef __STDC__
468 #define __weak_reference(sym,alias) \
469 __asm__(".weak " #alias); \
470 __asm__(".equ " #alias ", " #sym)
471 #define __warn_references(sym,msg) \
472 __asm__(".section .gnu.warning." #sym); \
473 __asm__(".asciz \"" msg "\""); \
474 __asm__(".previous")
475 #define __sym_compat(sym,impl,verid) \
476 __asm__(".symver " #impl ", " #sym "@" #verid)
477 #define __sym_default(sym,impl,verid) \
478 __asm__(".symver " #impl ", " #sym "@@" #verid)
479 #else
480 #define __weak_reference(sym,alias) \
481 __asm__(".weak alias"); \
482 __asm__(".equ alias, sym")
483 #define __warn_references(sym,msg) \
484 __asm__(".section .gnu.warning.sym"); \
485 __asm__(".asciz \"msg\""); \
486 __asm__(".previous")
487 #define __sym_compat(sym,impl,verid) \
488 __asm__(".symver impl, sym@verid")
489 #define __sym_default(impl,sym,verid) \
490 __asm__(".symver impl, sym@@verid")
491 #endif /* __STDC__ */
492 #endif /* __GNUC__ || __INTEL_COMPILER */
493
494 #define __GLOBL1(sym) __asm__(".globl " #sym)
495 #define __GLOBL(sym) __GLOBL1(sym)
496
497 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
498 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
499 #else
500 /*
501 * The following definition might not work well if used in header files,
502 * but it should be better than nothing. If you want a "do nothing"
503 * version, then it should generate some harmless declaration, such as:
504 * #define __IDSTRING(name,string) struct __hack
505 */
506 #define __IDSTRING(name,string) static const char name[] __unused = string
507 #endif
508
509 /*
510 * Embed the rcs id of a source file in the resulting library. Note that in
511 * more recent ELF binutils, we use .ident allowing the ID to be stripped.
512 * Usage:
513 * __FBSDID("$FreeBSD$");
514 */
515 #ifndef __FBSDID
516 #if !defined(lint) && !defined(STRIP_FBSDID)
517 #define __FBSDID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
518 #else
519 #define __FBSDID(s) struct __hack
520 #endif
521 #endif
522
523 #ifndef __RCSID
524 #ifndef NO__RCSID
525 #define __RCSID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
526 #else
527 #define __RCSID(s) struct __hack
528 #endif
529 #endif
530
531 #ifndef __RCSID_SOURCE
532 #ifndef NO__RCSID_SOURCE
533 #define __RCSID_SOURCE(s) __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
534 #else
535 #define __RCSID_SOURCE(s) struct __hack
536 #endif
537 #endif
538
539 #ifndef __SCCSID
540 #ifndef NO__SCCSID
541 #define __SCCSID(s) __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
542 #else
543 #define __SCCSID(s) struct __hack
544 #endif
545 #endif
546
547 #ifndef __COPYRIGHT
548 #ifndef NO__COPYRIGHT
549 #define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
550 #else
551 #define __COPYRIGHT(s) struct __hack
552 #endif
553 #endif
554
555 #ifndef __DECONST
556 #define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var))
557 #endif
558
559 #ifndef __DEVOLATILE
560 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
561 #endif
562
563 #ifndef __DEQUALIFY
564 #define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
565 #endif
566
567 /*-
568 * The following definitions are an extension of the behavior originally
569 * implemented in <sys/_posix.h>, but with a different level of granularity.
570 * POSIX.1 requires that the macros we test be defined before any standard
571 * header file is included.
572 *
573 * Here's a quick run-down of the versions:
574 * defined(_POSIX_SOURCE) 1003.1-1988
575 * _POSIX_C_SOURCE == 1 1003.1-1990
576 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
577 * _POSIX_C_SOURCE == 199309 1003.1b-1993
578 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
579 * and the omnibus ISO/IEC 9945-1: 1996
580 * _POSIX_C_SOURCE == 200112 1003.1-2001
581 * _POSIX_C_SOURCE == 200809 1003.1-2008
582 *
583 * In addition, the X/Open Portability Guide, which is now the Single UNIX
584 * Specification, defines a feature-test macro which indicates the version of
585 * that specification, and which subsumes _POSIX_C_SOURCE.
586 *
587 * Our macros begin with two underscores to avoid namespace screwage.
588 */
589
590 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
591 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
592 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
593 #define _POSIX_C_SOURCE 199009
594 #endif
595
596 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
597 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
598 #undef _POSIX_C_SOURCE
599 #define _POSIX_C_SOURCE 199209
600 #endif
601
602 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
603 #ifdef _XOPEN_SOURCE
604 #if _XOPEN_SOURCE - 0 >= 700
605 #define __XSI_VISIBLE 700
606 #undef _POSIX_C_SOURCE
607 #define _POSIX_C_SOURCE 200809
608 #elif _XOPEN_SOURCE - 0 >= 600
609 #define __XSI_VISIBLE 600
610 #undef _POSIX_C_SOURCE
611 #define _POSIX_C_SOURCE 200112
612 #elif _XOPEN_SOURCE - 0 >= 500
613 #define __XSI_VISIBLE 500
614 #undef _POSIX_C_SOURCE
615 #define _POSIX_C_SOURCE 199506
616 #endif
617 #endif
618
619 /*
620 * Deal with all versions of POSIX. The ordering relative to the tests above is
621 * important.
622 */
623 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
624 #define _POSIX_C_SOURCE 198808
625 #endif
626 #ifdef _POSIX_C_SOURCE
627 #if _POSIX_C_SOURCE >= 200809
628 #define __POSIX_VISIBLE 200809
629 #define __ISO_C_VISIBLE 1999
630 #elif _POSIX_C_SOURCE >= 200112
631 #define __POSIX_VISIBLE 200112
632 #define __ISO_C_VISIBLE 1999
633 #elif _POSIX_C_SOURCE >= 199506
634 #define __POSIX_VISIBLE 199506
635 #define __ISO_C_VISIBLE 1990
636 #elif _POSIX_C_SOURCE >= 199309
637 #define __POSIX_VISIBLE 199309
638 #define __ISO_C_VISIBLE 1990
639 #elif _POSIX_C_SOURCE >= 199209
640 #define __POSIX_VISIBLE 199209
641 #define __ISO_C_VISIBLE 1990
642 #elif _POSIX_C_SOURCE >= 199009
643 #define __POSIX_VISIBLE 199009
644 #define __ISO_C_VISIBLE 1990
645 #else
646 #define __POSIX_VISIBLE 198808
647 #define __ISO_C_VISIBLE 0
648 #endif /* _POSIX_C_SOURCE */
649 #else
650 /*-
651 * Deal with _ANSI_SOURCE:
652 * If it is defined, and no other compilation environment is explicitly
653 * requested, then define our internal feature-test macros to zero. This
654 * makes no difference to the preprocessor (undefined symbols in preprocessing
655 * expressions are defined to have value zero), but makes it more convenient for
656 * a test program to print out the values.
657 *
658 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
659 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
660 * environment (and in fact we will never get here).
661 */
662 #if defined(_ANSI_SOURCE) /* Hide almost everything. */
663 #define __POSIX_VISIBLE 0
664 #define __XSI_VISIBLE 0
665 #define __BSD_VISIBLE 0
666 #define __ISO_C_VISIBLE 1990
667 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
668 #define __POSIX_VISIBLE 0
669 #define __XSI_VISIBLE 0
670 #define __BSD_VISIBLE 0
671 #define __ISO_C_VISIBLE 1999
672 #else /* Default environment: show everything. */
673 #define __POSIX_VISIBLE 200809
674 #define __XSI_VISIBLE 700
675 #define __BSD_VISIBLE 1
676 #define __ISO_C_VISIBLE 1999
677 #endif
678 #endif
679
680 #ifndef __has_extension
681 #define __has_extension __has_feature
682 #endif
683 #ifndef __has_feature
684 #define __has_feature(x) 0
685 #endif
686 #ifndef __has_include
687 #define __has_include(x) 0
688 #endif
689 #ifndef __has_builtin
690 #define __has_builtin(x) 0
691 #endif
692
693 #if defined(__mips) || defined(__powerpc64__) || defined(__arm__)
694 #define __NO_TLS 1
695 #endif
696
697 #endif /* !_SYS_CDEFS_H_ */
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