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FreeBSD/Linux Kernel Cross Reference
sys/sys/cdefs.h

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  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: src/sys/sys/cdefs.h,v 1.96 2008/10/21 16:46:50 rdivacky Exp $
 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 #define __GNUCLIKE_ATTRIBUTE_MODE_DI 1
 66 
 67 #ifndef __INTEL_COMPILER
 68 # define __GNUCLIKE_CTOR_SECTION_HANDLING 1
 69 #endif
 70 
 71 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
 72 # if defined(__INTEL_COMPILER) && defined(__cplusplus) \
 73     && __INTEL_COMPILER < 800
 74 #  undef __GNUCLIKE_BUILTIN_CONSTANT_P
 75 # endif
 76 
 77 #if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3) && !defined(__INTEL_COMPILER)
 78 # define __GNUCLIKE_BUILTIN_VARARGS 1
 79 # define __GNUCLIKE_BUILTIN_STDARG 1
 80 # define __GNUCLIKE_BUILTIN_VAALIST 1
 81 #endif
 82 
 83 #if defined(__GNUC__)
 84 # define __GNUC_VA_LIST_COMPATIBILITY 1
 85 #endif
 86 
 87 #ifndef __INTEL_COMPILER
 88 # define __GNUCLIKE_BUILTIN_NEXT_ARG 1
 89 # define __GNUCLIKE_MATH_BUILTIN_RELOPS
 90 #endif
 91 
 92 #define __GNUCLIKE_BUILTIN_MEMCPY 1
 93 
 94 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
 95 #define __CC_SUPPORTS_INLINE 1
 96 #define __CC_SUPPORTS___INLINE 1
 97 #define __CC_SUPPORTS___INLINE__ 1
 98 
 99 #define __CC_SUPPORTS___FUNC__ 1
100 #define __CC_SUPPORTS_WARNING 1
101 
102 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
103 
104 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
105 
106 #endif /* __GNUC__ || __INTEL_COMPILER */
107 
108 /*
109  * Macro to test if we're using a specific version of gcc or later.
110  */
111 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
112 #define __GNUC_PREREQ__(ma, mi) \
113         (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
114 #else
115 #define __GNUC_PREREQ__(ma, mi) 0
116 #endif
117 
118 /*
119  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
120  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
121  * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
122  * mode -- there must be no spaces between its arguments, and for nested
123  * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
124  * concatenate double-quoted strings produced by the __STRING macro, but
125  * this only works with ANSI C.
126  *
127  * __XSTRING is like __STRING, but it expands any macros in its argument
128  * first.  It is only available with ANSI C.
129  */
130 #if defined(__STDC__) || defined(__cplusplus)
131 #define __P(protos)     protos          /* full-blown ANSI C */
132 #define __CONCAT1(x,y)  x ## y
133 #define __CONCAT(x,y)   __CONCAT1(x,y)
134 #define __STRING(x)     #x              /* stringify without expanding x */
135 #define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */
136 
137 #define __const         const           /* define reserved names to standard */
138 #define __signed        signed
139 #define __volatile      volatile
140 #if defined(__cplusplus)
141 #define __inline        inline          /* convert to C++ keyword */
142 #else
143 #if !(defined(__CC_SUPPORTS___INLINE))
144 #define __inline                        /* delete GCC keyword */
145 #endif /* ! __CC_SUPPORTS___INLINE */
146 #endif /* !__cplusplus */
147 
148 #else   /* !(__STDC__ || __cplusplus) */
149 #define __P(protos)     ()              /* traditional C preprocessor */
150 #define __CONCAT(x,y)   x/**/y
151 #define __STRING(x)     "x"
152 
153 #if !defined(__CC_SUPPORTS___INLINE)
154 #define __const                         /* delete pseudo-ANSI C keywords */
155 #define __inline
156 #define __signed
157 #define __volatile
158 /*
159  * In non-ANSI C environments, new programs will want ANSI-only C keywords
160  * deleted from the program and old programs will want them left alone.
161  * When using a compiler other than gcc, programs using the ANSI C keywords
162  * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
163  * When using "gcc -traditional", we assume that this is the intent; if
164  * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
165  */
166 #ifndef NO_ANSI_KEYWORDS
167 #define const                           /* delete ANSI C keywords */
168 #define inline
169 #define signed
170 #define volatile
171 #endif  /* !NO_ANSI_KEYWORDS */
172 #endif  /* !__CC_SUPPORTS___INLINE */
173 #endif  /* !(__STDC__ || __cplusplus) */
174 
175 /*
176  * Compiler-dependent macros to help declare dead (non-returning) and
177  * pure (no side effects) functions, and unused variables.  They are
178  * null except for versions of gcc that are known to support the features
179  * properly (old versions of gcc-2 supported the dead and pure features
180  * in a different (wrong) way).  If we do not provide an implementation
181  * for a given compiler, let the compile fail if it is told to use
182  * a feature that we cannot live without.
183  */
184 #ifdef lint
185 #define __dead2
186 #define __pure2
187 #define __unused
188 #define __packed
189 #define __aligned(x)
190 #define __section(x)
191 #else
192 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
193 #define __dead2
194 #define __pure2
195 #define __unused
196 #endif
197 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
198 #define __dead2         __attribute__((__noreturn__))
199 #define __pure2         __attribute__((__const__))
200 #define __unused
201 /* XXX Find out what to do for __packed, __aligned and __section */
202 #endif
203 #if __GNUC_PREREQ__(2, 7)
204 #define __dead2         __attribute__((__noreturn__))
205 #define __pure2         __attribute__((__const__))
206 #define __unused        __attribute__((__unused__))
207 #define __used          __attribute__((__used__))
208 #define __packed        __attribute__((__packed__))
209 #define __aligned(x)    __attribute__((__aligned__(x)))
210 #define __section(x)    __attribute__((__section__(x)))
211 #endif
212 #if defined(__INTEL_COMPILER)
213 #define __dead2         __attribute__((__noreturn__))
214 #define __pure2         __attribute__((__const__))
215 #define __unused        __attribute__((__unused__))
216 #define __used          __attribute__((__used__))
217 #define __packed        __attribute__((__packed__))
218 #define __aligned(x)    __attribute__((__aligned__(x)))
219 #define __section(x)    __attribute__((__section__(x)))
220 #endif
221 #endif
222 
223 #if __GNUC_PREREQ__(2, 96)
224 #define __pure          __attribute__((__pure__))
225 #else
226 #define __pure
227 #endif
228 
229 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
230 #define __always_inline __attribute__((__always_inline__))
231 #else
232 #define __always_inline
233 #endif
234 
235 #if __GNUC_PREREQ__(4, 2) /* actually 4.1.3 */
236 #define __gnu89_inline  __attribute__((__gnu_inline__)) __inline
237 #else
238 #define __gnu89_inline
239 #endif
240 
241 #if __GNUC_PREREQ__(3, 1)
242 #define __noinline      __attribute__ ((__noinline__))
243 #else
244 #define __noinline
245 #endif
246 
247 #if __GNUC_PREREQ__(3, 3)
248 #define __nonnull(x)    __attribute__((__nonnull__(x)))
249 #else
250 #define __nonnull(x)
251 #endif
252 
253 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
254 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
255 #define __func__        NULL
256 #endif
257 
258 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
259 #define __LONG_LONG_SUPPORTED
260 #endif
261 
262 /*
263  * GCC 2.95 provides `__restrict' as an extension to C90 to support the
264  * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
265  * a way to define the `restrict' type qualifier without disturbing older
266  * software that is unaware of C99 keywords.
267  */
268 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
269 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901
270 #define __restrict
271 #else
272 #define __restrict      restrict
273 #endif
274 #endif
275 
276 /*
277  * GNU C version 2.96 adds explicit branch prediction so that
278  * the CPU back-end can hint the processor and also so that
279  * code blocks can be reordered such that the predicted path
280  * sees a more linear flow, thus improving cache behavior, etc.
281  *
282  * The following two macros provide us with a way to utilize this
283  * compiler feature.  Use __predict_true() if you expect the expression
284  * to evaluate to true, and __predict_false() if you expect the
285  * expression to evaluate to false.
286  *
287  * A few notes about usage:
288  *
289  *      * Generally, __predict_false() error condition checks (unless
290  *        you have some _strong_ reason to do otherwise, in which case
291  *        document it), and/or __predict_true() `no-error' condition
292  *        checks, assuming you want to optimize for the no-error case.
293  *
294  *      * Other than that, if you don't know the likelihood of a test
295  *        succeeding from empirical or other `hard' evidence, don't
296  *        make predictions.
297  *
298  *      * These are meant to be used in places that are run `a lot'.
299  *        It is wasteful to make predictions in code that is run
300  *        seldomly (e.g. at subsystem initialization time) as the
301  *        basic block reordering that this affects can often generate
302  *        larger code.
303  */
304 #if __GNUC_PREREQ__(2, 96)
305 #define __predict_true(exp)     __builtin_expect((exp), 1)
306 #define __predict_false(exp)    __builtin_expect((exp), 0)
307 #else
308 #define __predict_true(exp)     (exp)
309 #define __predict_false(exp)    (exp)
310 #endif
311 
312 /*
313  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
314  * require it.
315  */
316 #if __GNUC_PREREQ__(4, 1)
317 #define __offsetof(type, field)  __builtin_offsetof(type, field)
318 #else
319 #ifndef __cplusplus
320 #define __offsetof(type, field) ((size_t)(&((type *)0)->field))
321 #else
322 #define __offsetof(type, field)                                 \
323   (__offsetof__ (reinterpret_cast <size_t>                      \
324                  (&reinterpret_cast <const volatile char &>     \
325                   (static_cast<type *> (0)->field))))
326 #endif
327 #endif
328 #define __rangeof(type, start, end) \
329         (__offsetof(type, end) - __offsetof(type, start))
330 
331 /*
332  * Compiler-dependent macros to declare that functions take printf-like
333  * or scanf-like arguments.  They are null except for versions of gcc
334  * that are known to support the features properly (old versions of gcc-2
335  * didn't permit keeping the keywords out of the application namespace).
336  */
337 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
338 #define __printflike(fmtarg, firstvararg)
339 #define __scanflike(fmtarg, firstvararg)
340 #define __format_arg(fmtarg)
341 #else
342 #define __printflike(fmtarg, firstvararg) \
343             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
344 #define __scanflike(fmtarg, firstvararg) \
345             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
346 #define __format_arg(fmtarg)    __attribute__((__format_arg__ (fmtarg)))
347 #endif
348 
349 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
350 #if __FreeBSD_cc_version >= 300001 && defined(__GNUC__) && !defined(__INTEL_COMPILER)
351 #define __printf0like(fmtarg, firstvararg) \
352             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
353 #else
354 #define __printf0like(fmtarg, firstvararg)
355 #endif
356 
357 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
358 #ifndef __INTEL_COMPILER
359 #define __strong_reference(sym,aliassym)        \
360         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
361 #endif
362 #ifdef __STDC__
363 #define __weak_reference(sym,alias)     \
364         __asm__(".weak " #alias);       \
365         __asm__(".equ "  #alias ", " #sym)
366 #define __warn_references(sym,msg)      \
367         __asm__(".section .gnu.warning." #sym); \
368         __asm__(".asciz \"" msg "\"");  \
369         __asm__(".previous")
370 #define __sym_compat(sym,impl,verid)    \
371         __asm__(".symver " #impl ", " #sym "@" #verid)
372 #define __sym_default(sym,impl,verid)   \
373         __asm__(".symver " #impl ", " #sym "@@" #verid)
374 #else
375 #define __weak_reference(sym,alias)     \
376         __asm__(".weak alias");         \
377         __asm__(".equ alias, sym")
378 #define __warn_references(sym,msg)      \
379         __asm__(".section .gnu.warning.sym"); \
380         __asm__(".asciz \"msg\"");      \
381         __asm__(".previous")
382 #define __sym_compat(sym,impl,verid)    \
383         __asm__(".symver impl, sym@verid")
384 #define __sym_default(impl,sym,verid)   \
385         __asm__(".symver impl, sym@@verid")
386 #endif  /* __STDC__ */
387 #endif  /* __GNUC__ || __INTEL_COMPILER */
388 
389 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
390 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
391 #else
392 /*
393  * The following definition might not work well if used in header files,
394  * but it should be better than nothing.  If you want a "do nothing"
395  * version, then it should generate some harmless declaration, such as:
396  *    #define __IDSTRING(name,string)   struct __hack
397  */
398 #define __IDSTRING(name,string) static const char name[] __unused = string
399 #endif
400 
401 /*
402  * Embed the rcs id of a source file in the resulting library.  Note that in
403  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
404  * Usage:
405  *      __FBSDID("$FreeBSD: src/sys/sys/cdefs.h,v 1.96 2008/10/21 16:46:50 rdivacky Exp $");
406  */
407 #ifndef __FBSDID
408 #if !defined(lint) && !defined(STRIP_FBSDID)
409 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
410 #else
411 #define __FBSDID(s)     struct __hack
412 #endif
413 #endif
414 
415 #ifndef __RCSID
416 #ifndef NO__RCSID
417 #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
418 #else
419 #define __RCSID(s)      struct __hack
420 #endif
421 #endif
422 
423 #ifndef __RCSID_SOURCE
424 #ifndef NO__RCSID_SOURCE
425 #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
426 #else
427 #define __RCSID_SOURCE(s)       struct __hack
428 #endif
429 #endif
430 
431 #ifndef __SCCSID
432 #ifndef NO__SCCSID
433 #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
434 #else
435 #define __SCCSID(s)     struct __hack
436 #endif
437 #endif
438 
439 #ifndef __COPYRIGHT
440 #ifndef NO__COPYRIGHT
441 #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
442 #else
443 #define __COPYRIGHT(s)  struct __hack
444 #endif
445 #endif
446 
447 #ifndef __DECONST
448 #define __DECONST(type, var)    ((type)(uintptr_t)(const void *)(var))
449 #endif
450 
451 #ifndef __DEVOLATILE
452 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
453 #endif
454 
455 #ifndef __DEQUALIFY
456 #define __DEQUALIFY(type, var)  ((type)(uintptr_t)(const volatile void *)(var))
457 #endif
458 
459 /*-
460  * The following definitions are an extension of the behavior originally
461  * implemented in <sys/_posix.h>, but with a different level of granularity.
462  * POSIX.1 requires that the macros we test be defined before any standard
463  * header file is included.
464  *
465  * Here's a quick run-down of the versions:
466  *  defined(_POSIX_SOURCE)              1003.1-1988
467  *  _POSIX_C_SOURCE == 1                1003.1-1990
468  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
469  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
470  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
471  *                                      and the omnibus ISO/IEC 9945-1: 1996
472  *  _POSIX_C_SOURCE == 200112           1003.1-2001
473  *
474  * In addition, the X/Open Portability Guide, which is now the Single UNIX
475  * Specification, defines a feature-test macro which indicates the version of
476  * that specification, and which subsumes _POSIX_C_SOURCE.
477  *
478  * Our macros begin with two underscores to avoid namespace screwage.
479  */
480 
481 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
482 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
483 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
484 #define _POSIX_C_SOURCE         199009
485 #endif
486 
487 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
488 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
489 #undef _POSIX_C_SOURCE
490 #define _POSIX_C_SOURCE         199209
491 #endif
492 
493 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
494 #ifdef _XOPEN_SOURCE
495 #if _XOPEN_SOURCE - 0 >= 600
496 #define __XSI_VISIBLE           600
497 #undef _POSIX_C_SOURCE
498 #define _POSIX_C_SOURCE         200112
499 #elif _XOPEN_SOURCE - 0 >= 500
500 #define __XSI_VISIBLE           500
501 #undef _POSIX_C_SOURCE
502 #define _POSIX_C_SOURCE         199506
503 #endif
504 #endif
505 
506 /*
507  * Deal with all versions of POSIX.  The ordering relative to the tests above is
508  * important.
509  */
510 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
511 #define _POSIX_C_SOURCE         198808
512 #endif
513 #ifdef _POSIX_C_SOURCE
514 #if _POSIX_C_SOURCE >= 200112
515 #define __POSIX_VISIBLE         200112
516 #define __ISO_C_VISIBLE         1999
517 #elif _POSIX_C_SOURCE >= 199506
518 #define __POSIX_VISIBLE         199506
519 #define __ISO_C_VISIBLE         1990
520 #elif _POSIX_C_SOURCE >= 199309
521 #define __POSIX_VISIBLE         199309
522 #define __ISO_C_VISIBLE         1990
523 #elif _POSIX_C_SOURCE >= 199209
524 #define __POSIX_VISIBLE         199209
525 #define __ISO_C_VISIBLE         1990
526 #elif _POSIX_C_SOURCE >= 199009
527 #define __POSIX_VISIBLE         199009
528 #define __ISO_C_VISIBLE         1990
529 #else
530 #define __POSIX_VISIBLE         198808
531 #define __ISO_C_VISIBLE         0
532 #endif /* _POSIX_C_SOURCE */
533 #else
534 /*-
535  * Deal with _ANSI_SOURCE:
536  * If it is defined, and no other compilation environment is explicitly
537  * requested, then define our internal feature-test macros to zero.  This
538  * makes no difference to the preprocessor (undefined symbols in preprocessing
539  * expressions are defined to have value zero), but makes it more convenient for
540  * a test program to print out the values.
541  *
542  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
543  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
544  * environment (and in fact we will never get here).
545  */
546 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
547 #define __POSIX_VISIBLE         0
548 #define __XSI_VISIBLE           0
549 #define __BSD_VISIBLE           0
550 #define __ISO_C_VISIBLE         1990
551 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
552 #define __POSIX_VISIBLE         0
553 #define __XSI_VISIBLE           0
554 #define __BSD_VISIBLE           0
555 #define __ISO_C_VISIBLE         1999
556 #else                           /* Default environment: show everything. */
557 #define __POSIX_VISIBLE         200112
558 #define __XSI_VISIBLE           600
559 #define __BSD_VISIBLE           1
560 #define __ISO_C_VISIBLE         1999
561 #endif
562 #endif
563 
564 #endif /* !_SYS_CDEFS_H_ */
565 

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