xref: /dragonfly/sys/sys/cdefs.h (revision 3d33658b)
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 #define	__weak_symbol	__attribute__((__weak__))
163 #if __GNUC_PREREQ__(2, 7)
164 #define	__dead2		__attribute__((__noreturn__))
165 #define	__pure2		__attribute__((__const__))
166 #define	__unused	__attribute__((__unused__))
167 #define	__packed	__attribute__((__packed__))
168 #define	__aligned(x)	__attribute__((__aligned__(x)))
169 #define	__section(x)	__attribute__((__section__(x)))
170 #define __read_mostly		__section(".data.read_mostly")
171 #define __read_frequently	__section(".data.read_frequently")
172 #define __exclusive_cache_line	__aligned(__VM_CACHELINE_SIZE*2)	\
173 				__section(".data.exclusive_cache_line")
174 
175 #else
176 #define	__dead2
177 #define	__pure2
178 #define	__unused
179 #endif
180 
181 #if __GNUC_PREREQ__(2, 96)
182 #define	__malloclike	__attribute__((__malloc__))
183 #define	__pure		__attribute__((__pure__))
184 #else
185 #define	__malloclike
186 #define	__pure		__pure2
187 #endif
188 
189 #if __GNUC_PREREQ__(3, 1)
190 #define	__always_inline	__attribute__((__always_inline__))
191 #define	__noinline	__attribute__((__noinline__))
192 #else
193 #define	__always_inline
194 #define	__noinline
195 #endif
196 
197 #if __GNUC_PREREQ__(3, 3)
198 #define	__nonnull(...)	__attribute__((__nonnull__(__VA_ARGS__)))
199 #define	__used		__attribute__((__used__))
200 #else
201 #define	__nonnull(...)
202 #define	__used		__unused
203 #endif
204 
205 #if __GNUC_PREREQ__(3, 4)
206 #define	__heedresult	__attribute__((__warn_unused_result__))
207 #else
208 #define	__heedresult
209 #endif
210 
211 #if __GNUC_PREREQ__(4, 1)
212 #define	__returns_twice	__attribute__((__returns_twice__))
213 #else
214 #define	__returns_twice
215 #endif
216 
217 #if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__)
218 #define	__alloc_size(x)		__attribute__((__alloc_size__(x)))
219 #define	__alloc_size2(n, x)	__attribute__((__alloc_size__(n, x)))
220 #else
221 #define	__alloc_size(x)
222 #define	__alloc_size2(n, x)
223 #endif
224 
225 #if __GNUC_PREREQ__(4, 9) || __has_attribute(__alloc_align__)
226 #define	__alloc_align(x)	__attribute__((__alloc_align__(x)))
227 #else
228 #define	__alloc_align(x)
229 #endif
230 
231 #if !__GNUC_PREREQ__(2, 7) && __STDC_VERSION__ < 199901
232 #define	__func__	NULL
233 #endif
234 
235 #if (__GNUC_PREREQ__(2, 0) && !defined(__STRICT_ANSI__)) || \
236     __STDC_VERSION__ >= 199901
237 #define	__LONG_LONG_SUPPORTED
238 #endif
239 
240 /* C++11 exposes a load of C99 stuff */
241 #if defined(__cplusplus) && __cplusplus >= 201103L
242 #define	__LONG_LONG_SUPPORTED
243 #ifndef	__STDC_LIMIT_MACROS
244 #define	__STDC_LIMIT_MACROS
245 #endif
246 #ifndef	__STDC_CONSTANT_MACROS
247 #define	__STDC_CONSTANT_MACROS
248 #endif
249 #endif
250 
251 /*
252  * GCC 2.95 and later provides `__restrict' as an extension to C90 to support
253  * the C99-specific `restrict' type qualifier.  We happen to use `__restrict'
254  * as a way to define the `restrict' type qualifier without disturbing older
255  * software that is unaware of C99 keywords.
256  */
257 #if !__GNUC_PREREQ__(2, 95)
258 #if __STDC_VERSION__ < 199901
259 #define	__restrict
260 #else
261 #define	__restrict	restrict
262 #endif
263 #endif
264 
265 /*
266  * C99 allows to declare arrays as non-overlapping.
267  */
268 #if __GNUC_PREREQ__(3, 1) && !defined(__GNUG__)
269 #define	__restrict_arr	__restrict
270 #else
271 #ifdef __GNUC__
272 #define	__restrict_arr
273 #else
274 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901
275 #define	__restrict_arr	restrict
276 #else
277 #define	__restrict_arr
278 #endif
279 #endif
280 #endif
281 
282 /*
283  * GNU C version 2.96 adds explicit branch prediction so that
284  * the CPU back-end can hint the processor and also so that
285  * code blocks can be reordered such that the predicted path
286  * sees a more linear flow, thus improving cache behavior, etc.
287  *
288  * The following two macros provide us with a way to utilize this
289  * compiler feature.  Use __predict_true() if you expect the expression
290  * to evaluate to true, and __predict_false() if you expect the
291  * expression to evaluate to false.
292  *
293  * A few notes about usage:
294  *
295  *	* Generally, __predict_false() error condition checks (unless
296  *	  you have some _strong_ reason to do otherwise, in which case
297  *	  document it), and/or __predict_true() `no-error' condition
298  *	  checks, assuming you want to optimize for the no-error case.
299  *
300  *	* Other than that, if you don't know the likelihood of a test
301  *	  succeeding from empirical or other `hard' evidence, don't
302  *	  make predictions.
303  *
304  *	* These are meant to be used in places that are run `a lot'.
305  *	  It is wasteful to make predictions in code that is run
306  *	  seldomly (e.g. at subsystem initialization time) as the
307  *	  basic block reordering that this affects can often generate
308  *	  larger code.
309  */
310 #if __GNUC_PREREQ__(2, 96)
311 #define	__predict_true(exp)     __builtin_expect((exp), 1)
312 #define	__predict_false(exp)    __builtin_expect((exp), 0)
313 #else
314 #define	__predict_true(exp)     (exp)
315 #define	__predict_false(exp)    (exp)
316 #endif
317 
318 /*
319  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
320  * require it.
321  */
322 #if __GNUC_PREREQ__(4, 1)
323 #define	__offsetof(type, field)	__builtin_offsetof(type, field)
324 #else
325 #ifndef __cplusplus
326 #define	__offsetof(type, field) \
327 	((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
328 #else
329 #define	__offsetof(type, field)					\
330 	(__offsetof__ (reinterpret_cast <__size_t>		\
331 		 (&reinterpret_cast <const volatile char &>	\
332 		  (static_cast<type *> (0)->field))))
333 #endif
334 #endif
335 
336 /*
337  * Compiler-dependent macros to declare that functions take printf-like
338  * or scanf-like arguments.  They are null except for versions of gcc
339  * that are known to support the features properly (old versions of gcc-2
340  * didn't permit keeping the keywords out of the application namespace).
341  *
342  * The printf0like macro for GCC 2 uses DragonFly specific compiler extensions.
343  */
344 #if !__GNUC_PREREQ__(2, 7)
345 #define	__printflike(fmtarg, firstvararg)
346 #define	__scanflike(fmtarg, firstvararg)
347 #define	__printf0like(fmtarg, firstvararg)
348 #define	__format_arg(fmtarg)
349 #define	__strfmonlike(fmtarg, firstvararg)
350 #define	__strftimelike(fmtarg, firstvararg)
351 
352 #elif __GNUC_PREREQ__(3, 0)
353 #define	__printflike(fmtarg, firstvararg) \
354             __attribute__((__nonnull__(fmtarg), \
355 			  __format__ (__printf__, fmtarg, firstvararg)))
356 #define	__printf0like(fmtarg, firstvararg) \
357             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
358 #define	__scanflike(fmtarg, firstvararg) \
359 	    __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
360 #define	__format_arg(fmtarg) \
361 	    __attribute__((__format_arg__ (fmtarg)))
362 #define	__strfmonlike(fmtarg, firstvararg) \
363 	    __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
364 #define	__strftimelike(fmtarg, firstvararg) \
365 	    __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
366 
367 #else
368 #define	__printflike(fmtarg, firstvararg) \
369 	    __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
370 #define	__printf0like(fmtarg, firstvararg) \
371 	    __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
372 #define	__scanflike(fmtarg, firstvararg) \
373 	    __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
374 #define	__format_arg(fmtarg) \
375 	    __attribute__((__format_arg__ (fmtarg)))
376 #define	__strfmonlike(fmtarg, firstvararg) \
377 	    __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
378 #define	__strftimelike(fmtarg, firstvararg) \
379 	    __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
380 #endif
381 
382 #if !__GNUC_PREREQ__(3, 0)
383 #define	__ARRAY_ZERO	0
384 #else
385 #define	__ARRAY_ZERO
386 #endif
387 
388 #if __GNUC_PREREQ__(4, 0)
389 #define	__dso_public	__attribute__((__visibility__("default")))
390 #define	__dso_hidden	__attribute__((__visibility__("hidden")))
391 #else
392 #define	__dso_public
393 #define	__dso_hidden
394 #endif
395 
396 /*
397  * A convenient constructor macro, GCC 4.3.0 added priority support to
398  * constructors, provide a compatible interface for both.
399  */
400 #if __GNUC_PREREQ__(4, 3)
401 #define	__constructor(prio)	__attribute__((constructor(prio)))
402 #else
403 #define	__constructor(prio)	__attribute__((constructor))
404 #endif
405 
406 /*
407  * Handy GCC based macros:
408  *
409  * 	__cachealign:
410  *
411  * 	The __cachealign macro can be used for cache line aligning structures
412  * 	of small to medium size.  It aligns the particular structure or
413  * 	storage type to a system default cache line alignment, thus giving us
414  * 	a much more better cache utilization by making the hardware work at
415  * 	its best burst speeds.
416  *
417  * 	__usereg:
418  *
419  * 	The __usereg macro can/should be used when a function contains
420  * 	arguments not more than 3.  It can be very useful to us due to the
421  * 	message-passing nature of the kernel.
422  *
423  * !!NOTE - USAGE INFORMATION!!
424  *
425  * The __cachealign macro should not be used for data structures that are
426  * as big struct proc, struct vnode, struct thread, and other structs which
427  * are as big as them; simply because it will be useless in that case.
428  *
429  * The __usereg macro should be used whenever possible, i.e., when a function
430  * does not exceed more than 3 arguments, and should not be used for vararg
431  * type functions.
432  *
433  * In other words, AVOID MISUSE OF THESE MACROS. :-)
434  */
435 #ifdef __GNUC__
436 #define	__cachealign	__attribute__((__aligned__(__VM_CACHELINE_SIZE)))
437 #define	__usereg	__attribute__((__regparm__(3)))
438 #else
439 #define	__cachealign
440 #define	__usereg
441 #endif
442 
443 #ifdef __GNUC__
444 #define	__strong_reference(sym,aliassym)	\
445 	extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
446 #define	__weak_reference(sym,aliassym)	\
447 	__strong_reference(sym,aliassym) __attribute__ ((__weak__))
448 #define	__weak_reference_asm(sym,alias)	\
449 	__asm__(".weak " #alias);	\
450 	__asm__(".equ "  #alias ", " #sym)
451 #define	__warn_references(sym,msg)	\
452 	__asm__(".section .gnu.warning." #sym);	\
453 	__asm__(".asciz \"" msg "\"");	\
454 	__asm__(".previous")
455 #define	__sym_compat(sym,impl,verid)	\
456 	__asm__(".symver " #impl ", " #sym "@" #verid)
457 #define	__sym_default(sym,impl,verid)	\
458 	__asm__(".symver " #impl ", " #sym "@@@" #verid)
459 #endif	/* __GNUC__ */
460 
461 #if defined(__GNUC__)
462 #define	__IDSTRING(name,string)	__asm__(".ident\t\"" string "\"")
463 #endif
464 
465 #ifndef	__RCSID
466 #define	__RCSID(s)		struct __hack
467 #endif
468 
469 #ifndef	__RCSID_SOURCE
470 #define	__RCSID_SOURCE(s)	struct __hack
471 #endif
472 
473 #ifndef	__SCCSID
474 #define	__SCCSID(s)		struct __hack
475 #endif
476 
477 #ifndef	__FBSDID
478 #define	__FBSDID(s)		struct __hack
479 #endif
480 
481 #ifndef	__COPYRIGHT
482 #define	__COPYRIGHT(s)  	struct __hack
483 #endif
484 
485 #ifndef	__DECONST
486 #define	__DECONST(type, var)	((type)(uintptr_t)(const void *)(var))
487 #endif
488 
489 #ifndef	__DEVOLATILE
490 #define	__DEVOLATILE(type, var)	((type)(uintptr_t)(volatile void *)(var))
491 #endif
492 
493 #ifndef	__DEQUALIFY
494 #define	__DEQUALIFY(type, var)	((type)(uintptr_t)(const volatile void *)(var))
495 #endif
496 
497 /*
498  * Keywords added in C11.
499  */
500 
501 #if !__GNUC_PREREQ__(2, 95)
502 #define	__alignof(x)	__offsetof(struct { char __a; x __b; }, __b)
503 #endif
504 
505 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
506 
507 #if !__has_extension(c_alignas)
508 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
509     __has_extension(cxx_alignas)
510 #define	_Alignas(x)		alignas(x)
511 #else
512 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
513 #define	_Alignas(x)		__aligned(x)
514 #endif
515 #endif
516 
517 #if defined(__cplusplus) && __cplusplus >= 201103L
518 #define	_Alignof(x)		alignof(x)
519 #else
520 #define	_Alignof(x)		__alignof(x)
521 #endif
522 
523 #if !defined(_Noreturn)
524 #define	_Noreturn		__dead2
525 #endif
526 
527 #if !__has_extension(c_static_assert)
528 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
529     __has_extension(cxx_static_assert)
530 #define	_Static_assert(x, y)	static_assert(x, y)
531 #elif !__GNUC_PREREQ__(4, 6)
532 #define	_Static_assert(x, y)	struct __hack
533 #ifdef _KERNEL
534 #define	CTASSERT(x)		_CTASSERT(x, __LINE__)
535 #define	_CTASSERT(x, y)		__CTASSERT(x, y)
536 #define	__CTASSERT(x, y)	typedef char __assert ## y[(x) ? 1 : -1]
537 #endif
538 #endif
539 #endif
540 
541 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
542 
543 #if defined(_KERNEL) && !defined(CTASSERT)
544 #define	CTASSERT(x)		_Static_assert(x, \
545 				    "compile-time assertion failed")
546 #endif
547 
548 /*
549  * Emulation of C11 _Generic().  Unlike the previously defined C11
550  * keywords, it is not possible to implement this using exactly the same
551  * syntax.  Therefore implement something similar under the name
552  * __generic().  Unlike _Generic(), this macro can only distinguish
553  * between a single type, so it requires nested invocations to
554  * distinguish multiple cases.
555  */
556 
557 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
558 #define	__generic(expr, t, yes, no)					\
559 	_Generic(expr, t: yes, default: no)
560 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
561 #define	__generic(expr, t, yes, no)					\
562 	__builtin_choose_expr(						\
563 	    __builtin_types_compatible_p(__typeof(expr), t), yes, no)
564 #endif
565 
566 /*-
567  * POSIX.1 requires that the macros we test be defined before any standard
568  * header file is included.
569  *
570  * Here's a quick run-down of the versions:
571  *  defined(_POSIX_SOURCE)		1003.1-1988
572  *  _POSIX_C_SOURCE == 1		1003.1-1990
573  *  _POSIX_C_SOURCE == 2		1003.2-1992 C Language Binding Option
574  *  _POSIX_C_SOURCE == 199309		1003.1b-1993
575  *  _POSIX_C_SOURCE == 199506		1003.1c-1995, 1003.1i-1995,
576  *					and the omnibus ISO/IEC 9945-1: 1996
577  *  _POSIX_C_SOURCE == 200112		1003.1-2001
578  *  _POSIX_C_SOURCE == 200809		1003.1-2008
579  *
580  * In addition, the X/Open Portability Guide, which is now the Single UNIX
581  * Specification, defines a feature-test macro which indicates the version of
582  * that specification, and which subsumes _POSIX_C_SOURCE.
583  *
584  * Our macros begin with two underscores to avoid namespace screwage.
585  */
586 
587 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
588 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 1
589 #undef _POSIX_C_SOURCE		/* Probably illegal, but beyond caring now. */
590 #define	_POSIX_C_SOURCE		199009
591 #endif
592 
593 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
594 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 2
595 #undef _POSIX_C_SOURCE
596 #define	_POSIX_C_SOURCE		199209
597 #endif
598 
599 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
600 #ifdef _XOPEN_SOURCE
601 #if _XOPEN_SOURCE - 0 >= 700
602 #define	__XSI_VISIBLE		700
603 #undef _POSIX_C_SOURCE
604 #define	_POSIX_C_SOURCE		200809
605 #elif _XOPEN_SOURCE - 0 >= 600
606 #define	__XSI_VISIBLE		600
607 #undef _POSIX_C_SOURCE
608 #define	_POSIX_C_SOURCE		200112
609 #elif _XOPEN_SOURCE - 0 >= 500
610 #define	__XSI_VISIBLE		500
611 #undef _POSIX_C_SOURCE
612 #define	_POSIX_C_SOURCE		199506
613 #endif
614 #endif
615 
616 /*
617  * Deal with all versions of POSIX.  The ordering relative to the tests above is
618  * important.
619  */
620 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
621 #define	_POSIX_C_SOURCE		198808
622 #endif
623 #ifdef _POSIX_C_SOURCE
624 #if (_POSIX_C_SOURCE - 0) >= 200809
625 #define	__POSIX_VISIBLE		200809
626 #define	__ISO_C_VISIBLE		1999
627 #elif (_POSIX_C_SOURCE - 0) >= 200112
628 #define	__POSIX_VISIBLE		200112
629 #define	__ISO_C_VISIBLE		1999
630 #elif (_POSIX_C_SOURCE - 0) >= 199506
631 #define	__POSIX_VISIBLE		199506
632 #define	__ISO_C_VISIBLE		1990
633 #elif (_POSIX_C_SOURCE - 0) >= 199309
634 #define	__POSIX_VISIBLE		199309
635 #define	__ISO_C_VISIBLE		1990
636 #elif (_POSIX_C_SOURCE - 0) >= 199209
637 #define	__POSIX_VISIBLE		199209
638 #define	__ISO_C_VISIBLE		1990
639 #elif (_POSIX_C_SOURCE - 0) >= 199009
640 #define	__POSIX_VISIBLE		199009
641 #define	__ISO_C_VISIBLE		1990
642 #else
643 #define	__POSIX_VISIBLE		198808
644 #define	__ISO_C_VISIBLE		0
645 #endif /* _POSIX_C_SOURCE */
646 #else
647 /*-
648  * Deal with _ANSI_SOURCE:
649  * If it is defined, and no other compilation environment is explicitly
650  * requested, then define our internal feature-test macros to zero.  This
651  * makes no difference to the preprocessor (undefined symbols in preprocessing
652  * expressions are defined to have value zero), but makes it more convenient for
653  * a test program to print out the values.
654  *
655  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
656  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
657  * environment (and in fact we will never get here).
658  */
659 #if defined(_ANSI_SOURCE)	/* Hide almost everything. */
660 #define	__POSIX_VISIBLE		0
661 #define	__XSI_VISIBLE		0
662 #define	__BSD_VISIBLE		0
663 #define	__ISO_C_VISIBLE		1990
664 #define	__EXT1_VISIBLE		0
665 #elif defined(_C99_SOURCE)	/* Localism to specify strict C99 env. */
666 #define	__POSIX_VISIBLE		0
667 #define	__XSI_VISIBLE		0
668 #define	__BSD_VISIBLE		0
669 #define	__ISO_C_VISIBLE		1999
670 #define	__EXT1_VISIBLE		0
671 #elif defined(_C11_SOURCE)	/* Localism to specify strict C11 env. */
672 #define	__POSIX_VISIBLE		0
673 #define	__XSI_VISIBLE		0
674 #define	__BSD_VISIBLE		0
675 #define	__ISO_C_VISIBLE		2011
676 #define	__EXT1_VISIBLE		0
677 #else				/* Default environment: show everything. */
678 #define	__POSIX_VISIBLE		200809
679 #define	__XSI_VISIBLE		700
680 #define	__BSD_VISIBLE		1
681 #define	__ISO_C_VISIBLE		2011
682 #define	__EXT1_VISIBLE		1
683 #endif
684 #endif
685 
686 /* User override __EXT1_VISIBLE */
687 #if defined(__STDC_WANT_LIB_EXT1__)
688 #undef	__EXT1_VISIBLE
689 #if __STDC_WANT_LIB_EXT1__
690 #define	__EXT1_VISIBLE		1
691 #else
692 #define	__EXT1_VISIBLE		0
693 #endif
694 #endif /* __STDC_WANT_LIB_EXT1__ */
695 
696 /*
697  * GLOBL macro exists to preserve __start_set_* and __stop_set_* sections
698  * of kernel modules which are discarded from binutils 2.17.50+ otherwise.
699  */
700 
701 #define	__GLOBL1(sym)	__asm__(".globl " #sym)
702 #define	__GLOBL(sym)	__GLOBL1(sym)
703 
704 #endif /* !_SYS_CDEFS_H_ */
705