2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Berkeley Software Design, Inc.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
32 * @(#)cdefs.h 8.8 (Berkeley) 1/9/95
40 * Testing against Clang-specific extensions.
43 #ifndef __has_extension
44 #define __has_extension __has_feature
47 #define __has_feature(x) 0
50 #define __has_include(x) 0
53 #define __has_builtin(x) 0
56 #if defined(__cplusplus)
57 #define __BEGIN_DECLS extern "C" {
65 * This code has been put in place to help reduce the addition of
66 * compiler specific defines in FreeBSD code. It helps to aid in
67 * having a compiler-agnostic source tree.
70 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
72 #if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
73 #define __GNUCLIKE_ASM 3
74 #define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
76 #define __GNUCLIKE_ASM 2
78 #define __GNUCLIKE___TYPEOF 1
79 #define __GNUCLIKE___OFFSETOF 1
80 #define __GNUCLIKE___SECTION 1
82 #ifndef __INTEL_COMPILER
83 # define __GNUCLIKE_CTOR_SECTION_HANDLING 1
86 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
87 # if defined(__INTEL_COMPILER) && defined(__cplusplus) \
88 && __INTEL_COMPILER < 800
89 # undef __GNUCLIKE_BUILTIN_CONSTANT_P
92 #if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3) && !defined(__INTEL_COMPILER)
93 # define __GNUCLIKE_BUILTIN_VARARGS 1
94 # define __GNUCLIKE_BUILTIN_STDARG 1
95 # define __GNUCLIKE_BUILTIN_VAALIST 1
99 # define __GNUC_VA_LIST_COMPATIBILITY 1
103 * Compiler memory barriers, specific to gcc and clang.
105 #if defined(__GNUC__)
106 #define __compiler_membar() __asm __volatile(" " : : : "memory")
109 #ifndef __INTEL_COMPILER
110 # define __GNUCLIKE_BUILTIN_NEXT_ARG 1
111 # define __GNUCLIKE_MATH_BUILTIN_RELOPS
114 #define __GNUCLIKE_BUILTIN_MEMCPY 1
116 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
117 #define __CC_SUPPORTS_INLINE 1
118 #define __CC_SUPPORTS___INLINE 1
119 #define __CC_SUPPORTS___INLINE__ 1
121 #define __CC_SUPPORTS___FUNC__ 1
122 #define __CC_SUPPORTS_WARNING 1
124 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
126 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
128 #endif /* __GNUC__ || __INTEL_COMPILER */
131 * Macro to test if we're using a specific version of gcc or later.
133 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
134 #define __GNUC_PREREQ__(ma, mi) \
135 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
137 #define __GNUC_PREREQ__(ma, mi) 0
141 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
142 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
143 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
144 * mode -- there must be no spaces between its arguments, and for nested
145 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
146 * concatenate double-quoted strings produced by the __STRING macro, but
147 * this only works with ANSI C.
149 * __XSTRING is like __STRING, but it expands any macros in its argument
150 * first. It is only available with ANSI C.
152 #if defined(__STDC__) || defined(__cplusplus)
153 #define __P(protos) protos /* full-blown ANSI C */
154 #define __CONCAT1(x,y) x ## y
155 #define __CONCAT(x,y) __CONCAT1(x,y)
156 #define __STRING(x) #x /* stringify without expanding x */
157 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */
159 #define __const const /* define reserved names to standard */
160 #define __signed signed
161 #define __volatile volatile
162 #if defined(__cplusplus)
163 #define __inline inline /* convert to C++ keyword */
165 #if !(defined(__CC_SUPPORTS___INLINE))
166 #define __inline /* delete GCC keyword */
167 #endif /* ! __CC_SUPPORTS___INLINE */
168 #endif /* !__cplusplus */
170 #else /* !(__STDC__ || __cplusplus) */
171 #define __P(protos) () /* traditional C preprocessor */
172 #define __CONCAT(x,y) x/**/y
173 #define __STRING(x) "x"
175 #if !defined(__CC_SUPPORTS___INLINE)
176 #define __const /* delete pseudo-ANSI C keywords */
181 * In non-ANSI C environments, new programs will want ANSI-only C keywords
182 * deleted from the program and old programs will want them left alone.
183 * When using a compiler other than gcc, programs using the ANSI C keywords
184 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
185 * When using "gcc -traditional", we assume that this is the intent; if
186 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
188 #ifndef NO_ANSI_KEYWORDS
189 #define const /* delete ANSI C keywords */
193 #endif /* !NO_ANSI_KEYWORDS */
194 #endif /* !__CC_SUPPORTS___INLINE */
195 #endif /* !(__STDC__ || __cplusplus) */
198 * Compiler-dependent macros to help declare dead (non-returning) and
199 * pure (no side effects) functions, and unused variables. They are
200 * null except for versions of gcc that are known to support the features
201 * properly (old versions of gcc-2 supported the dead and pure features
202 * in a different (wrong) way). If we do not provide an implementation
203 * for a given compiler, let the compile fail if it is told to use
204 * a feature that we cannot live without.
215 #define __weak __attribute__((__weak__))
216 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
221 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
222 #define __dead2 __attribute__((__noreturn__))
223 #define __pure2 __attribute__((__const__))
225 /* XXX Find out what to do for __packed, __aligned and __section */
227 #if __GNUC_PREREQ__(2, 7)
228 #define __dead2 __attribute__((__noreturn__))
229 #define __pure2 __attribute__((__const__))
230 #define __unused __attribute__((__unused__))
231 #define __used __attribute__((__used__))
232 #define __packed __attribute__((__packed__))
233 #define __aligned(x) __attribute__((__aligned__(x)))
234 #define __section(x) __attribute__((__section__(x)))
236 #if defined(__INTEL_COMPILER)
237 #define __dead2 __attribute__((__noreturn__))
238 #define __pure2 __attribute__((__const__))
239 #define __unused __attribute__((__unused__))
240 #define __used __attribute__((__used__))
241 #define __packed __attribute__((__packed__))
242 #define __aligned(x) __attribute__((__aligned__(x)))
243 #define __section(x) __attribute__((__section__(x)))
247 #if !__GNUC_PREREQ__(2, 95)
248 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b)
252 * Keywords added in C11.
255 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L || defined(lint)
257 #if !__has_extension(c_alignas)
258 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
259 __has_extension(cxx_alignas)
260 #define _Alignas(x) alignas(x)
262 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
263 #define _Alignas(x) __aligned(x)
267 #if defined(__cplusplus) && __cplusplus >= 201103L
268 #define _Alignof(x) alignof(x)
270 #define _Alignof(x) __alignof(x)
273 #if !__has_extension(c_atomic) && !__has_extension(cxx_atomic)
275 * No native support for _Atomic(). Place object in structure to prevent
276 * most forms of direct non-atomic access.
278 #define _Atomic(T) struct { T volatile __val; }
281 #if defined(__cplusplus) && __cplusplus >= 201103L
282 #define _Noreturn [[noreturn]]
284 #define _Noreturn __dead2
287 #if !__has_extension(c_static_assert)
288 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
289 __has_extension(cxx_static_assert)
290 #define _Static_assert(x, y) static_assert(x, y)
291 #elif __GNUC_PREREQ__(4,6)
292 /* Nothing, gcc 4.6 and higher has _Static_assert built-in */
293 #elif defined(__COUNTER__)
294 #define _Static_assert(x, y) __Static_assert(x, __COUNTER__)
295 #define __Static_assert(x, y) ___Static_assert(x, y)
296 #define ___Static_assert(x, y) typedef char __assert_ ## y[(x) ? 1 : -1] \
299 #define _Static_assert(x, y) struct __hack
303 #if !__has_extension(c_thread_local)
305 * XXX: Some compilers (Clang 3.3, GCC 4.7) falsely announce C++11 mode
306 * without actually supporting the thread_local keyword. Don't check for
307 * the presence of C++11 when defining _Thread_local.
309 #if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \
310 __has_extension(cxx_thread_local)
311 #define _Thread_local thread_local
313 #define _Thread_local __thread
317 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
320 * Emulation of C11 _Generic(). Unlike the previously defined C11
321 * keywords, it is not possible to implement this using exactly the same
322 * syntax. Therefore implement something similar under the name
323 * __generic(). Unlike _Generic(), this macro can only distinguish
324 * between a single type, so it requires nested invocations to
325 * distinguish multiple cases.
328 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
329 __has_extension(c_generic_selections)
330 #define __generic(expr, t, yes, no) \
331 _Generic(expr, t: yes, default: no)
332 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
333 #define __generic(expr, t, yes, no) \
334 __builtin_choose_expr( \
335 __builtin_types_compatible_p(__typeof(expr), t), yes, no)
338 #if __GNUC_PREREQ__(2, 96)
339 #define __malloc_like __attribute__((__malloc__))
340 #define __pure __attribute__((__pure__))
342 #define __malloc_like
346 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
347 #define __always_inline __attribute__((__always_inline__))
349 #define __always_inline
352 #if __GNUC_PREREQ__(3, 1)
353 #define __noinline __attribute__ ((__noinline__))
358 #if __GNUC_PREREQ__(3, 3)
359 #define __nonnull(x) __attribute__((__nonnull__(x)))
364 #if __GNUC_PREREQ__(3, 4)
365 #define __fastcall __attribute__((__fastcall__))
370 #if __GNUC_PREREQ__(4, 1)
371 #define __returns_twice __attribute__((__returns_twice__))
373 #define __returns_twice
376 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
377 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
378 #define __func__ NULL
381 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
382 #define __LONG_LONG_SUPPORTED
385 /* C++11 exposes a load of C99 stuff */
386 #if defined(__cplusplus) && __cplusplus >= 201103L
387 #define __LONG_LONG_SUPPORTED
388 #ifndef __STDC_LIMIT_MACROS
389 #define __STDC_LIMIT_MACROS
391 #ifndef __STDC_CONSTANT_MACROS
392 #define __STDC_CONSTANT_MACROS
397 * GCC 2.95 provides `__restrict' as an extension to C90 to support the
398 * C99-specific `restrict' type qualifier. We happen to use `__restrict' as
399 * a way to define the `restrict' type qualifier without disturbing older
400 * software that is unaware of C99 keywords.
402 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
403 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
406 #define __restrict restrict
411 * GNU C version 2.96 adds explicit branch prediction so that
412 * the CPU back-end can hint the processor and also so that
413 * code blocks can be reordered such that the predicted path
414 * sees a more linear flow, thus improving cache behavior, etc.
416 * The following two macros provide us with a way to utilize this
417 * compiler feature. Use __predict_true() if you expect the expression
418 * to evaluate to true, and __predict_false() if you expect the
419 * expression to evaluate to false.
421 * A few notes about usage:
423 * * Generally, __predict_false() error condition checks (unless
424 * you have some _strong_ reason to do otherwise, in which case
425 * document it), and/or __predict_true() `no-error' condition
426 * checks, assuming you want to optimize for the no-error case.
428 * * Other than that, if you don't know the likelihood of a test
429 * succeeding from empirical or other `hard' evidence, don't
432 * * These are meant to be used in places that are run `a lot'.
433 * It is wasteful to make predictions in code that is run
434 * seldomly (e.g. at subsystem initialization time) as the
435 * basic block reordering that this affects can often generate
438 #if __GNUC_PREREQ__(2, 96)
439 #define __predict_true(exp) __builtin_expect((exp), 1)
440 #define __predict_false(exp) __builtin_expect((exp), 0)
442 #define __predict_true(exp) (exp)
443 #define __predict_false(exp) (exp)
446 #if __GNUC_PREREQ__(4, 2)
447 #define __hidden __attribute__((__visibility__("hidden")))
448 #define __exported __attribute__((__visibility__("default")))
455 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
458 #if __GNUC_PREREQ__(4, 1)
459 #define __offsetof(type, field) __builtin_offsetof(type, field)
462 #define __offsetof(type, field) \
463 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
465 #define __offsetof(type, field) \
466 (__offsetof__ (reinterpret_cast <__size_t> \
467 (&reinterpret_cast <const volatile char &> \
468 (static_cast<type *> (0)->field))))
471 #define __rangeof(type, start, end) \
472 (__offsetof(type, end) - __offsetof(type, start))
475 * Given the pointer x to the member m of the struct s, return
476 * a pointer to the containing structure. When using GCC, we first
477 * assign pointer x to a local variable, to check that its type is
478 * compatible with member m.
480 #if __GNUC_PREREQ__(3, 1)
481 #define __containerof(x, s, m) ({ \
482 const volatile __typeof(((s *)0)->m) *__x = (x); \
483 __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
486 #define __containerof(x, s, m) \
487 __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
491 * Compiler-dependent macros to declare that functions take printf-like
492 * or scanf-like arguments. They are null except for versions of gcc
493 * that are known to support the features properly (old versions of gcc-2
494 * didn't permit keeping the keywords out of the application namespace).
496 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
497 #define __printflike(fmtarg, firstvararg)
498 #define __scanflike(fmtarg, firstvararg)
499 #define __format_arg(fmtarg)
500 #define __strfmonlike(fmtarg, firstvararg)
501 #define __strftimelike(fmtarg, firstvararg)
503 #define __printflike(fmtarg, firstvararg) \
504 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
505 #define __scanflike(fmtarg, firstvararg) \
506 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
507 #define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg)))
508 #define __strfmonlike(fmtarg, firstvararg) \
509 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
510 #define __strftimelike(fmtarg, firstvararg) \
511 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
514 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
515 #if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \
516 defined(__GNUC__) && !defined(__INTEL_COMPILER)
517 #define __printf0like(fmtarg, firstvararg) \
518 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
520 #define __printf0like(fmtarg, firstvararg)
523 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
524 #ifndef __INTEL_COMPILER
525 #define __strong_reference(sym,aliassym) \
526 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
529 #define __weak_reference(sym,alias) \
530 __asm__(".weak " #alias); \
531 __asm__(".equ " #alias ", " #sym)
532 #define __warn_references(sym,msg) \
533 __asm__(".section .gnu.warning." #sym); \
534 __asm__(".asciz \"" msg "\""); \
536 #define __sym_compat(sym,impl,verid) \
537 __asm__(".symver " #impl ", " #sym "@" #verid)
538 #define __sym_default(sym,impl,verid) \
539 __asm__(".symver " #impl ", " #sym "@@" #verid)
541 #define __weak_reference(sym,alias) \
542 __asm__(".weak alias"); \
543 __asm__(".equ alias, sym")
544 #define __warn_references(sym,msg) \
545 __asm__(".section .gnu.warning.sym"); \
546 __asm__(".asciz \"msg\""); \
548 #define __sym_compat(sym,impl,verid) \
549 __asm__(".symver impl, sym@verid")
550 #define __sym_default(impl,sym,verid) \
551 __asm__(".symver impl, sym@@verid")
552 #endif /* __STDC__ */
553 #endif /* __GNUC__ || __INTEL_COMPILER */
555 #define __GLOBL1(sym) __asm__(".globl " #sym)
556 #define __GLOBL(sym) __GLOBL1(sym)
558 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
559 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
562 * The following definition might not work well if used in header files,
563 * but it should be better than nothing. If you want a "do nothing"
564 * version, then it should generate some harmless declaration, such as:
565 * #define __IDSTRING(name,string) struct __hack
567 #define __IDSTRING(name,string) static const char name[] __unused = string
571 * Embed the rcs id of a source file in the resulting library. Note that in
572 * more recent ELF binutils, we use .ident allowing the ID to be stripped.
574 * __FBSDID("$FreeBSD$");
577 #if !defined(lint) && !defined(STRIP_FBSDID)
578 #define __FBSDID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
580 #define __FBSDID(s) struct __hack
586 #define __RCSID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
588 #define __RCSID(s) struct __hack
592 #ifndef __RCSID_SOURCE
593 #ifndef NO__RCSID_SOURCE
594 #define __RCSID_SOURCE(s) __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
596 #define __RCSID_SOURCE(s) struct __hack
602 #define __SCCSID(s) __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
604 #define __SCCSID(s) struct __hack
609 #ifndef NO__COPYRIGHT
610 #define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
612 #define __COPYRIGHT(s) struct __hack
617 #define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var))
621 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
625 #define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
629 * The following definitions are an extension of the behavior originally
630 * implemented in <sys/_posix.h>, but with a different level of granularity.
631 * POSIX.1 requires that the macros we test be defined before any standard
632 * header file is included.
634 * Here's a quick run-down of the versions:
635 * defined(_POSIX_SOURCE) 1003.1-1988
636 * _POSIX_C_SOURCE == 1 1003.1-1990
637 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
638 * _POSIX_C_SOURCE == 199309 1003.1b-1993
639 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
640 * and the omnibus ISO/IEC 9945-1: 1996
641 * _POSIX_C_SOURCE == 200112 1003.1-2001
642 * _POSIX_C_SOURCE == 200809 1003.1-2008
644 * In addition, the X/Open Portability Guide, which is now the Single UNIX
645 * Specification, defines a feature-test macro which indicates the version of
646 * that specification, and which subsumes _POSIX_C_SOURCE.
648 * Our macros begin with two underscores to avoid namespace screwage.
651 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
652 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
653 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
654 #define _POSIX_C_SOURCE 199009
657 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
658 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
659 #undef _POSIX_C_SOURCE
660 #define _POSIX_C_SOURCE 199209
663 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
665 #if _XOPEN_SOURCE - 0 >= 700
666 #define __XSI_VISIBLE 700
667 #undef _POSIX_C_SOURCE
668 #define _POSIX_C_SOURCE 200809
669 #elif _XOPEN_SOURCE - 0 >= 600
670 #define __XSI_VISIBLE 600
671 #undef _POSIX_C_SOURCE
672 #define _POSIX_C_SOURCE 200112
673 #elif _XOPEN_SOURCE - 0 >= 500
674 #define __XSI_VISIBLE 500
675 #undef _POSIX_C_SOURCE
676 #define _POSIX_C_SOURCE 199506
681 * Deal with all versions of POSIX. The ordering relative to the tests above is
684 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
685 #define _POSIX_C_SOURCE 198808
687 #ifdef _POSIX_C_SOURCE
688 #if _POSIX_C_SOURCE >= 200809
689 #define __POSIX_VISIBLE 200809
690 #define __ISO_C_VISIBLE 1999
691 #elif _POSIX_C_SOURCE >= 200112
692 #define __POSIX_VISIBLE 200112
693 #define __ISO_C_VISIBLE 1999
694 #elif _POSIX_C_SOURCE >= 199506
695 #define __POSIX_VISIBLE 199506
696 #define __ISO_C_VISIBLE 1990
697 #elif _POSIX_C_SOURCE >= 199309
698 #define __POSIX_VISIBLE 199309
699 #define __ISO_C_VISIBLE 1990
700 #elif _POSIX_C_SOURCE >= 199209
701 #define __POSIX_VISIBLE 199209
702 #define __ISO_C_VISIBLE 1990
703 #elif _POSIX_C_SOURCE >= 199009
704 #define __POSIX_VISIBLE 199009
705 #define __ISO_C_VISIBLE 1990
707 #define __POSIX_VISIBLE 198808
708 #define __ISO_C_VISIBLE 0
709 #endif /* _POSIX_C_SOURCE */
712 * Deal with _ANSI_SOURCE:
713 * If it is defined, and no other compilation environment is explicitly
714 * requested, then define our internal feature-test macros to zero. This
715 * makes no difference to the preprocessor (undefined symbols in preprocessing
716 * expressions are defined to have value zero), but makes it more convenient for
717 * a test program to print out the values.
719 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
720 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
721 * environment (and in fact we will never get here).
723 #if defined(_ANSI_SOURCE) /* Hide almost everything. */
724 #define __POSIX_VISIBLE 0
725 #define __XSI_VISIBLE 0
726 #define __BSD_VISIBLE 0
727 #define __ISO_C_VISIBLE 1990
728 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
729 #define __POSIX_VISIBLE 0
730 #define __XSI_VISIBLE 0
731 #define __BSD_VISIBLE 0
732 #define __ISO_C_VISIBLE 1999
733 #elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */
734 #define __POSIX_VISIBLE 0
735 #define __XSI_VISIBLE 0
736 #define __BSD_VISIBLE 0
737 #define __ISO_C_VISIBLE 2011
738 #else /* Default environment: show everything. */
739 #define __POSIX_VISIBLE 200809
740 #define __XSI_VISIBLE 700
741 #define __BSD_VISIBLE 1
742 #define __ISO_C_VISIBLE 2011
746 #if defined(__mips) || defined(__powerpc64__)
753 * Clang provides support for doing basic thread-safety tests at
754 * compile-time, by marking which locks will/should be held when
755 * entering/leaving a functions.
757 * Furthermore, it is also possible to annotate variables and structure
758 * members to enforce that they are only accessed when certain locks are
762 #if __has_extension(c_thread_safety_attributes)
763 #define __lock_annotate(x) __attribute__((x))
765 #define __lock_annotate(x)
768 /* Structure implements a lock. */
769 #define __lockable __lock_annotate(lockable)
771 /* Function acquires an exclusive or shared lock. */
772 #define __locks_exclusive(...) \
773 __lock_annotate(exclusive_lock_function(__VA_ARGS__))
774 #define __locks_shared(...) \
775 __lock_annotate(shared_lock_function(__VA_ARGS__))
777 /* Function attempts to acquire an exclusive or shared lock. */
778 #define __trylocks_exclusive(...) \
779 __lock_annotate(exclusive_trylock_function(__VA_ARGS__))
780 #define __trylocks_shared(...) \
781 __lock_annotate(shared_trylock_function(__VA_ARGS__))
783 /* Function releases a lock. */
784 #define __unlocks(...) __lock_annotate(unlock_function(__VA_ARGS__))
786 /* Function asserts that an exclusive or shared lock is held. */
787 #define __asserts_exclusive(...) \
788 __lock_annotate(assert_exclusive_lock(__VA_ARGS__))
789 #define __asserts_shared(...) \
790 __lock_annotate(assert_shared_lock(__VA_ARGS__))
792 /* Function requires that an exclusive or shared lock is or is not held. */
793 #define __requires_exclusive(...) \
794 __lock_annotate(exclusive_locks_required(__VA_ARGS__))
795 #define __requires_shared(...) \
796 __lock_annotate(shared_locks_required(__VA_ARGS__))
797 #define __requires_unlocked(...) \
798 __lock_annotate(locks_excluded(__VA_ARGS__))
800 /* Function should not be analyzed. */
801 #define __no_lock_analysis __lock_annotate(no_thread_safety_analysis)
803 /* Guard variables and structure members by lock. */
804 #define __guarded_by(x) __lock_annotate(guarded_by(x))
805 #define __pt_guarded_by(x) __lock_annotate(pt_guarded_by(x))
807 #endif /* !_SYS_CDEFS_H_ */