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 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)cdefs.h 8.8 (Berkeley) 1/9/95
37 * $FreeBSD: src/sys/sys/cdefs.h,v 1.28.2.8 2002/09/18 04:05:13 mikeh Exp $
38 * $DragonFly: src/sys/sys/cdefs.h,v 1.18 2005/07/26 16:45:04 joerg Exp $
44 #if defined(__cplusplus)
45 #define __BEGIN_DECLS extern "C" {
53 * Macro to test if we are using a specific version of gcc or later.
55 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
56 #define __GNUC_PREREQ__(ma, mi) \
57 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
59 #define __GNUC_PREREQ__(ma, mi) 0
63 * The __VM_CACHELINE_SIZE macro defines the common cache line alignment
64 * size that can be found across most recent and somewhat latest Intel
65 * hardware, i.e. L1 cache sizes etc.
67 * If needed, this value can be TUNED. Suitable values for this macro
68 * are 32, 64 and 128 bytes. The unit of measurement for this macro is
71 * XXX: This macro and related macros will eventually move to a MD
72 * header, but currently, we do need such a hierarchy.
74 #define __VM_CACHELINE_SIZE 32
77 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
78 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
79 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
80 * mode -- there must be no spaces between its arguments, and for nested
81 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
82 * concatenate double-quoted strings produced by the __STRING macro, but
83 * this only works with ANSI C.
85 * __XSTRING is like __STRING, but it expands any macros in its argument
86 * first. It is only available with ANSI C.
88 #if defined(__STDC__) || defined(__cplusplus)
89 #define __P(protos) protos /* full-blown ANSI C */
90 #define __CONCAT1(x,y) x ## y
91 #define __CONCAT(x,y) __CONCAT1(x,y)
92 #define __STRING(x) #x /* stringify without expanding x */
93 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */
95 #define __const const /* define reserved names to standard */
96 #define __signed signed
97 #define __volatile volatile
98 #if defined(__cplusplus)
99 #define __inline inline /* convert to C++ keyword */
102 #define __inline /* delete GCC keyword */
103 #endif /* !__GNUC__ */
104 #endif /* !__cplusplus */
106 #else /* !(__STDC__ || __cplusplus) */
107 #define __P(protos) () /* traditional C preprocessor */
108 #define __CONCAT(x,y) x/**/y
109 #define __STRING(x) "x"
112 #define __const /* delete pseudo-ANSI C keywords */
117 * In non-ANSI C environments, new programs will want ANSI-only C keywords
118 * deleted from the program and old programs will want them left alone.
119 * When using a compiler other than gcc, programs using the ANSI C keywords
120 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
121 * When using "gcc -traditional", we assume that this is the intent; if
122 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
124 #ifndef NO_ANSI_KEYWORDS
125 #define const /* delete ANSI C keywords */
129 #endif /* !NO_ANSI_KEYWORDS */
130 #endif /* !__GNUC__ */
131 #endif /* !(__STDC__ || __cplusplus) */
134 * Compiler-dependent macros to help declare dead (non-returning) and
135 * pure (no side effects) functions, and unused variables. They are
136 * null except for versions of gcc that are known to support the features
137 * properly (old versions of gcc-2 supported the dead and pure features
138 * in a different (wrong) way).
149 #define __always_inline
154 #if !__GNUC_PREREQ__(2, 7)
160 #if __GNUC_PREREQ__(2, 7)
161 #define __dead2 __attribute__((__noreturn__))
162 #define __pure2 __attribute__((__const__))
163 #define __unused __attribute__((__unused__))
164 #define __packed __attribute__((__packed__))
165 #define __aligned(x) __attribute__((__aligned__(x)))
166 #define __section(x) __attribute__((__section__(x)))
169 #if __GNUC_PREREQ__(2, 96)
170 #define __pure __attribute__((__pure__))
172 #define __pure __pure2
175 #if __GNUC_PREREQ__(3, 1)
176 #define __always_inline __attribute__((__always_inline__))
178 #define __always_inline
181 #if __GNUC_PREREQ__(3, 3)
182 #define __nonnull(x) __attribute__((__nonnull__(x)))
183 #define __used __attribute__((__used__))
186 #define __used __unused
191 #if !__GNUC_PREREQ__(2, 7) && __STDC_VERSION < 199901
192 #define __func__ NULL
195 #if (__GNUC_PREREQ__(2, 0) && !defined(__STRICT_ANSI)) || \
196 __STDC_VERSION__ >= 199901
197 #define __LONG_LONG_SUPPORTED
201 * GCC 2.95 and later provides `__restrict' as an extention to C90 to support
202 * the C99-specific `restrict' type qualifier. We happen to use `__restrict'
203 * as a way to define the `restrict' type qualifier without disturbing older
204 * software that is unaware of C99 keywords.
206 #if !__GNUC_PREREQ__(2, 95)
207 #if __STDC_VERSION__ < 199901
210 #define __restrict restrict
215 * Compiler-dependent macros to declare that functions take printf-like
216 * or scanf-like arguments. They are null except for versions of gcc
217 * that are known to support the features properly (old versions of gcc-2
218 * didn't permit keeping the keywords out of the application namespace).
220 * The printf0like macro for GCC 2 uses DragonFly specific compiler extensions.
222 #if !__GNUC_PREREQ__(2, 7)
223 #define __printflike(fmtarg, firstvararg)
224 #define __scanflike(fmtarg, firstvararg)
225 #define __printf0like(fmtarg, firstvararg)
226 #elif __GNUC_PREREQ__(3, 0)
227 #define __printflike(fmtarg, firstvararg) \
228 __attribute__((__nonnull__(fmtarg), \
229 __format__ (__printf__, fmtarg, firstvararg)))
230 #define __printf0like(fmtarg, firstvararg) \
231 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
232 #define __scanflike(fmtarg, firstvararg) \
233 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
236 #define __printflike(fmtarg, firstvararg) \
237 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
238 #define __printf0like(fmtarg, firstvararg) \
239 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
240 #define __scanflike(fmtarg, firstvararg) \
241 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
244 #if !__GNUC_PREREQ__(3, 0)
245 #define __ARRAY_ZERO 0
251 * Handy GCC based macros:
255 * The __cachealign macro can be used for cache line aligning structures
256 * of small to medium size. It aligns the particular structure or
257 * storage type to a system default cache line alignment, thus giving us
258 * a much more better cache utilization by making the hardware work at
259 * its best burst speeds.
263 * The __usereg macro can/should be used when a function contains
264 * arguments not more than 3. It can be very useful to us due to the
265 * message-passing nature of the kernel.
267 * !!NOTE - USAGE INFORMATION!!
269 * The __cachealign macro should not be used for data structures that are
270 * as big struct proc, struct vnode, struct thread, and other structs which
271 * are as big as them; simply because it will be useless in that case.
273 * The __usereg macro should be used whenever possible, i.e., when a function
274 * does not exceed more than 3 arguments, and should not be used for vararg
277 * In other words, AVOID MISUSE OF THESE MACROS. :-)
280 #define __cachealign __attribute__((__aligned__(__VM_CACHELINE_SIZE)))
281 #define __usereg __attribute__((__regparm__(3)))
288 #define __strong_reference(sym,aliassym) \
289 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)));
290 #define __weak_reference(sym,alias) \
291 __asm__(".weak " #alias); \
292 __asm__(".equ " #alias ", " #sym)
293 #define __warn_references(sym,msg) \
294 __asm__(".section .gnu.warning." #sym); \
295 __asm__(".asciz \"" msg "\""); \
297 #endif /* __GNUC__ */
299 #if defined(__GNUC__)
300 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
304 #define __RCSID(s) __IDSTRING(rcsid,s)
307 #ifndef __RCSID_SOURCE
308 #define __RCSID_SOURCE(s) __IDSTRING(rcsid_source,s)
312 #define __COPYRIGHT(s) __IDSTRING(copyright,s)
316 #define __DECONST(type, var) ((type)(uintptr_t)(const void *)(var))
320 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
324 #define __DEQUALIFY(type, var) ((type)(uintptr_t)(const volatile void *)(var))
328 * The following definitions are an extension of the behavior originally
329 * implemented in <sys/_posix.h>, but with a different level of granularity.
330 * POSIX.1 requires that the macros we test be defined before any standard
331 * header file is included.
333 * Here's a quick run-down of the versions:
334 * defined(_POSIX_SOURCE) 1003.1-1988
335 * _POSIX_C_SOURCE == 1 1003.1-1990
336 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
337 * _POSIX_C_SOURCE == 199309 1003.1b-1993
338 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
339 * and the omnibus ISO/IEC 9945-1: 1996
340 * _POSIX_C_SOURCE == 200112 1003.1-2001
342 * In addition, the X/Open Portability Guide, which is now the Single UNIX
343 * Specification, defines a feature-test macro which indicates the version of
344 * that specification, and which subsumes _POSIX_C_SOURCE.
346 * Our macros begin with two underscores to avoid namespace screwage.
350 * If no special macro was specified, make the DragonFly extensions
351 * available. Also make them available when requested so.
353 #if (!defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE) && \
354 !defined(_ANSI_SOURCE) && !defined(_C99_SOURCE)) || \
355 defined(_DRAGONFLY_SOURCE) || defined(_NETBSD_SOURCE)
356 #define __DF_VISIBLE 1
358 #define __DF_VISIBLE 0
361 #if defined(_POSIX_C_SOURCE)
363 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
364 #if _POSIX_C_SOURCE == 1
365 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
366 #define _POSIX_C_SOURCE 199009
369 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
370 #if _POSIX_C_SOURCE == 2
371 #undef _POSIX_C_SOURCE
372 #define _POSIX_C_SOURCE 199209
375 #endif /* _POSIX_C_SOURCE */
377 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
379 #if _XOPEN_SOURCE - 0 >= 600
380 #define __XSI_VISIBLE 600
381 #undef _POSIX_C_SOURCE
382 #define _POSIX_C_SOURCE 200112
383 #elif _XOPEN_SOURCE - 0 >= 500
384 #define __XSI_VISIBLE 500
385 #undef _POSIX_C_SOURCE
386 #define _POSIX_C_SOURCE 199506
391 * Deal with all versions of POSIX. The ordering relative to the tests above is
394 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
395 #define _POSIX_C_SOURCE 198808
397 #ifdef _POSIX_C_SOURCE
398 #if _POSIX_C_SOURCE >= 200112
399 #define __POSIX_VISIBLE 200112
400 #define __ISO_C_VISIBLE 1999
401 #elif _POSIX_C_SOURCE >= 199506
402 #define __POSIX_VISIBLE 199506
403 #define __ISO_C_VISIBLE 1990
404 #elif _POSIX_C_SOURCE >= 199309
405 #define __POSIX_VISIBLE 199309
406 #define __ISO_C_VISIBLE 1990
407 #elif _POSIX_C_SOURCE >= 199209
408 #define __POSIX_VISIBLE 199209
409 #define __ISO_C_VISIBLE 1990
410 #elif _POSIX_C_SOURCE >= 199009
411 #define __POSIX_VISIBLE 199009
412 #define __ISO_C_VISIBLE 1990
414 #define __POSIX_VISIBLE 198808
415 #define __ISO_C_VISIBLE 0
416 #endif /* _POSIX_C_SOURCE */
419 * Deal with _ANSI_SOURCE:
420 * If it is defined, and no other compilation environment is explicitly
421 * requested, then define our internal feature-test macros to zero. This
422 * makes no difference to the preprocessor (undefined symbols in preprocessing
423 * expressions are defined to have value zero), but makes it more convenient for
424 * a test program to print out the values.
426 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
427 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
428 * environment (and in fact we will never get here).
430 #ifdef _ANSI_SOURCE /* Hide almost everything. */
431 #define __POSIX_VISIBLE 0
432 #define __XSI_VISIBLE 0
433 #define __BSD_VISIBLE 0
434 #define __ISO_C_VISIBLE 1990
435 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
436 #define __POSIX_VISIBLE 0
437 #define __XSI_VISIBLE 0
438 #define __BSD_VISIBLE 0
439 #define __ISO_C_VISIBLE 1999
440 #else /* Default environment: show everything. */
441 #define __POSIX_VISIBLE 200112
442 #define __XSI_VISIBLE 600
443 #define __BSD_VISIBLE 1
444 #define __ISO_C_VISIBLE 1999
448 #endif /* !_SYS_CDEFS_H_ */