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
257 #if !__has_extension(c_alignas) && !__GNUC_PREREQ__(4, 7)
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 !__GNUC_PREREQ__(4, 7)
268 #if defined(__cplusplus) && __cplusplus >= 201103L
269 #define _Alignof(x) alignof(x)
271 #define _Alignof(x) __alignof(x)
275 #if !__has_extension(c_atomic) && !__has_extension(cxx_atomic)
277 * No native support for _Atomic(). Place object in structure to prevent
278 * most forms of direct non-atomic access.
280 #define _Atomic(T) struct { T volatile __val; }
283 #if !__GNUC_PREREQ__(4, 7)
284 #if defined(__cplusplus) && __cplusplus >= 201103L
285 #define _Noreturn [[noreturn]]
287 #define _Noreturn __dead2
291 #if !__has_extension(c_static_assert) && !__GNUC_PREREQ__(4, 7)
292 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
293 __has_extension(cxx_static_assert)
294 #define _Static_assert(x, y) static_assert(x, y)
295 #elif defined(__COUNTER__)
296 #define _Static_assert(x, y) __Static_assert(x, __COUNTER__)
297 #define __Static_assert(x, y) ___Static_assert(x, y)
298 #define ___Static_assert(x, y) typedef char __assert_ ## y[(x) ? 1 : -1]
300 #define _Static_assert(x, y) struct __hack
304 #if !__has_extension(c_thread_local) && !__GNUC_PREREQ__(4, 9)
306 * XXX: Some compilers (Clang 3.3, GCC 4.7) falsely announce C++11 mode
307 * without actually supporting the thread_local keyword. Don't check for
308 * the presence of C++11 when defining _Thread_local.
310 #if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \
311 __has_extension(cxx_thread_local)
312 #define _Thread_local thread_local
314 #define _Thread_local __thread
318 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
321 * Emulation of C11 _Generic(). Unlike the previously defined C11
322 * keywords, it is not possible to implement this using exactly the same
323 * syntax. Therefore implement something similar under the name
324 * __generic(). Unlike _Generic(), this macro can only distinguish
325 * between a single type, so it requires nested invocations to
326 * distinguish multiple cases.
329 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
330 __has_extension(c_generic_selections) || __GNUC_PREREQ__(4, 9)
331 #define __generic(expr, t, yes, no) \
332 _Generic(expr, t: yes, default: no)
333 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
334 #define __generic(expr, t, yes, no) \
335 __builtin_choose_expr( \
336 __builtin_types_compatible_p(__typeof(expr), t), yes, no)
339 #if __GNUC_PREREQ__(2, 96)
340 #define __malloc_like __attribute__((__malloc__))
341 #define __pure __attribute__((__pure__))
343 #define __malloc_like
347 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
348 #define __always_inline __attribute__((__always_inline__))
350 #define __always_inline
353 #if __GNUC_PREREQ__(3, 1)
354 #define __noinline __attribute__ ((__noinline__))
359 #if __GNUC_PREREQ__(3, 3)
360 #define __nonnull(x) __attribute__((__nonnull__(x)))
365 #if __GNUC_PREREQ__(3, 4)
366 #define __fastcall __attribute__((__fastcall__))
371 #if __GNUC_PREREQ__(4, 1)
372 #define __returns_twice __attribute__((__returns_twice__))
374 #define __returns_twice
377 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
378 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
379 #define __func__ NULL
382 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
383 #define __LONG_LONG_SUPPORTED
386 /* C++11 exposes a load of C99 stuff */
387 #if defined(__cplusplus) && __cplusplus >= 201103L
388 #define __LONG_LONG_SUPPORTED
389 #ifndef __STDC_LIMIT_MACROS
390 #define __STDC_LIMIT_MACROS
392 #ifndef __STDC_CONSTANT_MACROS
393 #define __STDC_CONSTANT_MACROS
398 * GCC 2.95 provides `__restrict' as an extension to C90 to support the
399 * C99-specific `restrict' type qualifier. We happen to use `__restrict' as
400 * a way to define the `restrict' type qualifier without disturbing older
401 * software that is unaware of C99 keywords.
403 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
404 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
407 #define __restrict restrict
412 * GNU C version 2.96 adds explicit branch prediction so that
413 * the CPU back-end can hint the processor and also so that
414 * code blocks can be reordered such that the predicted path
415 * sees a more linear flow, thus improving cache behavior, etc.
417 * The following two macros provide us with a way to utilize this
418 * compiler feature. Use __predict_true() if you expect the expression
419 * to evaluate to true, and __predict_false() if you expect the
420 * expression to evaluate to false.
422 * A few notes about usage:
424 * * Generally, __predict_false() error condition checks (unless
425 * you have some _strong_ reason to do otherwise, in which case
426 * document it), and/or __predict_true() `no-error' condition
427 * checks, assuming you want to optimize for the no-error case.
429 * * Other than that, if you don't know the likelihood of a test
430 * succeeding from empirical or other `hard' evidence, don't
433 * * These are meant to be used in places that are run `a lot'.
434 * It is wasteful to make predictions in code that is run
435 * seldomly (e.g. at subsystem initialization time) as the
436 * basic block reordering that this affects can often generate
439 #if __GNUC_PREREQ__(2, 96)
440 #define __predict_true(exp) __builtin_expect((exp), 1)
441 #define __predict_false(exp) __builtin_expect((exp), 0)
443 #define __predict_true(exp) (exp)
444 #define __predict_false(exp) (exp)
447 #if __GNUC_PREREQ__(4, 2)
448 #define __hidden __attribute__((__visibility__("hidden")))
449 #define __exported __attribute__((__visibility__("default")))
456 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
459 #if __GNUC_PREREQ__(4, 1)
460 #define __offsetof(type, field) __builtin_offsetof(type, field)
463 #define __offsetof(type, field) \
464 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
466 #define __offsetof(type, field) \
467 (__offsetof__ (reinterpret_cast <__size_t> \
468 (&reinterpret_cast <const volatile char &> \
469 (static_cast<type *> (0)->field))))
472 #define __rangeof(type, start, end) \
473 (__offsetof(type, end) - __offsetof(type, start))
476 * Given the pointer x to the member m of the struct s, return
477 * a pointer to the containing structure. When using GCC, we first
478 * assign pointer x to a local variable, to check that its type is
479 * compatible with member m.
481 #if __GNUC_PREREQ__(3, 1)
482 #define __containerof(x, s, m) ({ \
483 const volatile __typeof(((s *)0)->m) *__x = (x); \
484 __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
487 #define __containerof(x, s, m) \
488 __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
492 * Compiler-dependent macros to declare that functions take printf-like
493 * or scanf-like arguments. They are null except for versions of gcc
494 * that are known to support the features properly (old versions of gcc-2
495 * didn't permit keeping the keywords out of the application namespace).
497 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
498 #define __printflike(fmtarg, firstvararg)
499 #define __scanflike(fmtarg, firstvararg)
500 #define __format_arg(fmtarg)
501 #define __strfmonlike(fmtarg, firstvararg)
502 #define __strftimelike(fmtarg, firstvararg)
504 #define __printflike(fmtarg, firstvararg) \
505 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
506 #define __scanflike(fmtarg, firstvararg) \
507 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
508 #define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg)))
509 #define __strfmonlike(fmtarg, firstvararg) \
510 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
511 #define __strftimelike(fmtarg, firstvararg) \
512 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
515 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
516 #if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \
517 defined(__GNUC__) && !defined(__INTEL_COMPILER)
518 #define __printf0like(fmtarg, firstvararg) \
519 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
521 #define __printf0like(fmtarg, firstvararg)
524 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
525 #ifndef __INTEL_COMPILER
526 #define __strong_reference(sym,aliassym) \
527 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
530 #define __weak_reference(sym,alias) \
531 __asm__(".weak " #alias); \
532 __asm__(".equ " #alias ", " #sym)
533 #define __warn_references(sym,msg) \
534 __asm__(".section .gnu.warning." #sym); \
535 __asm__(".asciz \"" msg "\""); \
537 #define __sym_compat(sym,impl,verid) \
538 __asm__(".symver " #impl ", " #sym "@" #verid)
539 #define __sym_default(sym,impl,verid) \
540 __asm__(".symver " #impl ", " #sym "@@" #verid)
542 #define __weak_reference(sym,alias) \
543 __asm__(".weak alias"); \
544 __asm__(".equ alias, sym")
545 #define __warn_references(sym,msg) \
546 __asm__(".section .gnu.warning.sym"); \
547 __asm__(".asciz \"msg\""); \
549 #define __sym_compat(sym,impl,verid) \
550 __asm__(".symver impl, sym@verid")
551 #define __sym_default(impl,sym,verid) \
552 __asm__(".symver impl, sym@@verid")
553 #endif /* __STDC__ */
554 #endif /* __GNUC__ || __INTEL_COMPILER */
556 #define __GLOBL1(sym) __asm__(".globl " #sym)
557 #define __GLOBL(sym) __GLOBL1(sym)
559 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
560 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
563 * The following definition might not work well if used in header files,
564 * but it should be better than nothing. If you want a "do nothing"
565 * version, then it should generate some harmless declaration, such as:
566 * #define __IDSTRING(name,string) struct __hack
568 #define __IDSTRING(name,string) static const char name[] __unused = string
572 * Embed the rcs id of a source file in the resulting library. Note that in
573 * more recent ELF binutils, we use .ident allowing the ID to be stripped.
575 * __FBSDID("$FreeBSD$");
578 #if !defined(lint) && !defined(STRIP_FBSDID)
579 #define __FBSDID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
581 #define __FBSDID(s) struct __hack
587 #define __RCSID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
589 #define __RCSID(s) struct __hack
593 #ifndef __RCSID_SOURCE
594 #ifndef NO__RCSID_SOURCE
595 #define __RCSID_SOURCE(s) __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
597 #define __RCSID_SOURCE(s) struct __hack
603 #define __SCCSID(s) __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
605 #define __SCCSID(s) struct __hack
610 #ifndef NO__COPYRIGHT
611 #define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
613 #define __COPYRIGHT(s) struct __hack
618 #define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var))
622 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
626 #define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
630 * The following definitions are an extension of the behavior originally
631 * implemented in <sys/_posix.h>, but with a different level of granularity.
632 * POSIX.1 requires that the macros we test be defined before any standard
633 * header file is included.
635 * Here's a quick run-down of the versions:
636 * defined(_POSIX_SOURCE) 1003.1-1988
637 * _POSIX_C_SOURCE == 1 1003.1-1990
638 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
639 * _POSIX_C_SOURCE == 199309 1003.1b-1993
640 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
641 * and the omnibus ISO/IEC 9945-1: 1996
642 * _POSIX_C_SOURCE == 200112 1003.1-2001
643 * _POSIX_C_SOURCE == 200809 1003.1-2008
645 * In addition, the X/Open Portability Guide, which is now the Single UNIX
646 * Specification, defines a feature-test macro which indicates the version of
647 * that specification, and which subsumes _POSIX_C_SOURCE.
649 * Our macros begin with two underscores to avoid namespace screwage.
652 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
653 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
654 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
655 #define _POSIX_C_SOURCE 199009
658 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
659 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
660 #undef _POSIX_C_SOURCE
661 #define _POSIX_C_SOURCE 199209
664 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
666 #if _XOPEN_SOURCE - 0 >= 700
667 #define __XSI_VISIBLE 700
668 #undef _POSIX_C_SOURCE
669 #define _POSIX_C_SOURCE 200809
670 #elif _XOPEN_SOURCE - 0 >= 600
671 #define __XSI_VISIBLE 600
672 #undef _POSIX_C_SOURCE
673 #define _POSIX_C_SOURCE 200112
674 #elif _XOPEN_SOURCE - 0 >= 500
675 #define __XSI_VISIBLE 500
676 #undef _POSIX_C_SOURCE
677 #define _POSIX_C_SOURCE 199506
682 * Deal with all versions of POSIX. The ordering relative to the tests above is
685 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
686 #define _POSIX_C_SOURCE 198808
688 #ifdef _POSIX_C_SOURCE
689 #if _POSIX_C_SOURCE >= 200809
690 #define __POSIX_VISIBLE 200809
691 #define __ISO_C_VISIBLE 1999
692 #elif _POSIX_C_SOURCE >= 200112
693 #define __POSIX_VISIBLE 200112
694 #define __ISO_C_VISIBLE 1999
695 #elif _POSIX_C_SOURCE >= 199506
696 #define __POSIX_VISIBLE 199506
697 #define __ISO_C_VISIBLE 1990
698 #elif _POSIX_C_SOURCE >= 199309
699 #define __POSIX_VISIBLE 199309
700 #define __ISO_C_VISIBLE 1990
701 #elif _POSIX_C_SOURCE >= 199209
702 #define __POSIX_VISIBLE 199209
703 #define __ISO_C_VISIBLE 1990
704 #elif _POSIX_C_SOURCE >= 199009
705 #define __POSIX_VISIBLE 199009
706 #define __ISO_C_VISIBLE 1990
708 #define __POSIX_VISIBLE 198808
709 #define __ISO_C_VISIBLE 0
710 #endif /* _POSIX_C_SOURCE */
713 * Deal with _ANSI_SOURCE:
714 * If it is defined, and no other compilation environment is explicitly
715 * requested, then define our internal feature-test macros to zero. This
716 * makes no difference to the preprocessor (undefined symbols in preprocessing
717 * expressions are defined to have value zero), but makes it more convenient for
718 * a test program to print out the values.
720 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
721 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
722 * environment (and in fact we will never get here).
724 #if defined(_ANSI_SOURCE) /* Hide almost everything. */
725 #define __POSIX_VISIBLE 0
726 #define __XSI_VISIBLE 0
727 #define __BSD_VISIBLE 0
728 #define __ISO_C_VISIBLE 1990
729 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
730 #define __POSIX_VISIBLE 0
731 #define __XSI_VISIBLE 0
732 #define __BSD_VISIBLE 0
733 #define __ISO_C_VISIBLE 1999
734 #elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */
735 #define __POSIX_VISIBLE 0
736 #define __XSI_VISIBLE 0
737 #define __BSD_VISIBLE 0
738 #define __ISO_C_VISIBLE 2011
739 #else /* Default environment: show everything. */
740 #define __POSIX_VISIBLE 200809
741 #define __XSI_VISIBLE 700
742 #define __BSD_VISIBLE 1
743 #define __ISO_C_VISIBLE 2011
747 #if defined(__mips) || defined(__powerpc64__)
754 * Clang provides support for doing basic thread-safety tests at
755 * compile-time, by marking which locks will/should be held when
756 * entering/leaving a functions.
758 * Furthermore, it is also possible to annotate variables and structure
759 * members to enforce that they are only accessed when certain locks are
763 #if __has_extension(c_thread_safety_attributes)
764 #define __lock_annotate(x) __attribute__((x))
766 #define __lock_annotate(x)
769 /* Structure implements a lock. */
770 #define __lockable __lock_annotate(lockable)
772 /* Function acquires an exclusive or shared lock. */
773 #define __locks_exclusive(...) \
774 __lock_annotate(exclusive_lock_function(__VA_ARGS__))
775 #define __locks_shared(...) \
776 __lock_annotate(shared_lock_function(__VA_ARGS__))
778 /* Function attempts to acquire an exclusive or shared lock. */
779 #define __trylocks_exclusive(...) \
780 __lock_annotate(exclusive_trylock_function(__VA_ARGS__))
781 #define __trylocks_shared(...) \
782 __lock_annotate(shared_trylock_function(__VA_ARGS__))
784 /* Function releases a lock. */
785 #define __unlocks(...) __lock_annotate(unlock_function(__VA_ARGS__))
787 /* Function asserts that an exclusive or shared lock is held. */
788 #define __asserts_exclusive(...) \
789 __lock_annotate(assert_exclusive_lock(__VA_ARGS__))
790 #define __asserts_shared(...) \
791 __lock_annotate(assert_shared_lock(__VA_ARGS__))
793 /* Function requires that an exclusive or shared lock is or is not held. */
794 #define __requires_exclusive(...) \
795 __lock_annotate(exclusive_locks_required(__VA_ARGS__))
796 #define __requires_shared(...) \
797 __lock_annotate(shared_locks_required(__VA_ARGS__))
798 #define __requires_unlocked(...) \
799 __lock_annotate(locks_excluded(__VA_ARGS__))
801 /* Function should not be analyzed. */
802 #define __no_lock_analysis __lock_annotate(no_thread_safety_analysis)
804 /* Guard variables and structure members by lock. */
805 #define __guarded_by(x) __lock_annotate(guarded_by(x))
806 #define __pt_guarded_by(x) __lock_annotate(pt_guarded_by(x))
808 #endif /* !_SYS_CDEFS_H_ */