gsasl  1.10.0
About: GNU SASL is an implementation of the Simple Authentication and Security Layer (SASL). Development version.
  Fossies Dox: gsasl-1.10.0.tar.gz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

cdefs.h
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1 /* Copyright (C) 1992-2021 Free Software Foundation, Inc.
2  This file is part of the GNU C Library.
3 
4  The GNU C Library is free software; you can redistribute it and/or
5  modify it under the terms of the GNU Lesser General Public
6  License as published by the Free Software Foundation; either
7  version 2.1 of the License, or (at your option) any later version.
8 
9  The GNU C Library is distributed in the hope that it will be useful,
10  but WITHOUT ANY WARRANTY; without even the implied warranty of
11  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  Lesser General Public License for more details.
13 
14  You should have received a copy of the GNU Lesser General Public
15  License along with the GNU C Library; if not, see
16  <https://www.gnu.org/licenses/>. */
17 
18 #ifndef _SYS_CDEFS_H
19 #define _SYS_CDEFS_H 1
20 
21 /* We are almost always included from features.h. */
22 #ifndef _FEATURES_H
23 # include <features.h>
24 #endif
25 
26 /* The GNU libc does not support any K&R compilers or the traditional mode
27  of ISO C compilers anymore. Check for some of the combinations not
28  anymore supported. */
29 #if defined __GNUC__ && !defined __STDC__
30 # error "You need a ISO C conforming compiler to use the glibc headers"
31 #endif
32 
33 /* Some user header file might have defined this before. */
34 #undef __P
35 #undef __PMT
36 
37 /* Compilers that are not clang may object to
38  #if defined __clang__ && __has_attribute(...)
39  even though they do not need to evaluate the right-hand side of the &&. */
40 #if defined __clang__ && defined __has_attribute
41 # define __glibc_clang_has_attribute(name) __has_attribute (name)
42 #else
43 # define __glibc_clang_has_attribute(name) 0
44 #endif
45 
46 /* Compilers that are not clang may object to
47  #if defined __clang__ && __has_builtin(...)
48  even though they do not need to evaluate the right-hand side of the &&. */
49 #if defined __clang__ && defined __has_builtin
50 # define __glibc_clang_has_builtin(name) __has_builtin (name)
51 #else
52 # define __glibc_clang_has_builtin(name) 0
53 #endif
54 
55 /* Compilers that are not clang may object to
56  #if defined __clang__ && __has_extension(...)
57  even though they do not need to evaluate the right-hand side of the &&. */
58 #if defined __clang__ && defined __has_extension
59 # define __glibc_clang_has_extension(ext) __has_extension (ext)
60 #else
61 # define __glibc_clang_has_extension(ext) 0
62 #endif
63 
64 #if defined __GNUC__ || defined __clang__
65 
66 /* All functions, except those with callbacks or those that
67  synchronize memory, are leaf functions. */
68 # if __GNUC_PREREQ (4, 6) && !defined _LIBC
69 # define __LEAF , __leaf__
70 # define __LEAF_ATTR __attribute__ ((__leaf__))
71 # else
72 # define __LEAF
73 # define __LEAF_ATTR
74 # endif
75 
76 /* GCC can always grok prototypes. For C++ programs we add throw()
77  to help it optimize the function calls. But this works only with
78  gcc 2.8.x and egcs. For gcc 3.4 and up we even mark C functions
79  as non-throwing using a function attribute since programs can use
80  the -fexceptions options for C code as well. */
81 # if !defined __cplusplus \
82  && (__GNUC_PREREQ (3, 4) || __glibc_clang_has_attribute (__nothrow__))
83 # define __THROW __attribute__ ((__nothrow__ __LEAF))
84 # define __THROWNL __attribute__ ((__nothrow__))
85 # define __NTH(fct) __attribute__ ((__nothrow__ __LEAF)) fct
86 # define __NTHNL(fct) __attribute__ ((__nothrow__)) fct
87 # else
88 # if defined __cplusplus && (__GNUC_PREREQ (2,8) || __clang_major >= 4)
89 # define __THROW throw ()
90 # define __THROWNL throw ()
91 # define __NTH(fct) __LEAF_ATTR fct throw ()
92 # define __NTHNL(fct) fct throw ()
93 # else
94 # define __THROW
95 # define __THROWNL
96 # define __NTH(fct) fct
97 # define __NTHNL(fct) fct
98 # endif
99 # endif
100 
101 #else /* Not GCC or clang. */
102 
103 # if (defined __cplusplus \
104  || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
105 # define __inline inline
106 # else
107 # define __inline /* No inline functions. */
108 # endif
109 
110 # define __THROW
111 # define __THROWNL
112 # define __NTH(fct) fct
113 
114 #endif /* GCC || clang. */
115 
116 /* These two macros are not used in glibc anymore. They are kept here
117  only because some other projects expect the macros to be defined. */
118 #define __P(args) args
119 #define __PMT(args) args
120 
121 /* For these things, GCC behaves the ANSI way normally,
122  and the non-ANSI way under -traditional. */
123 
124 #define __CONCAT(x,y) x ## y
125 #define __STRING(x) #x
126 
127 /* This is not a typedef so `const __ptr_t' does the right thing. */
128 #define __ptr_t void *
129 
130 
131 /* C++ needs to know that types and declarations are C, not C++. */
132 #ifdef __cplusplus
133 # define __BEGIN_DECLS extern "C" {
134 # define __END_DECLS }
135 #else
136 # define __BEGIN_DECLS
137 # define __END_DECLS
138 #endif
139 
140 
141 /* Fortify support. */
142 #define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1)
143 #define __bos0(ptr) __builtin_object_size (ptr, 0)
144 
145 #if __GNUC_PREREQ (4,3)
146 # define __warndecl(name, msg) \
147  extern void name (void) __attribute__((__warning__ (msg)))
148 # define __warnattr(msg) __attribute__((__warning__ (msg)))
149 # define __errordecl(name, msg) \
150  extern void name (void) __attribute__((__error__ (msg)))
151 #elif __glibc_clang_has_attribute (__diagnose_if__) && 0
152 /* These definitions are not enabled, because they produce bogus warnings
153  in the glibc Fortify functions. These functions are written in a style
154  that works with GCC. In order to work with clang, these functions would
155  need to be modified. */
156 # define __warndecl(name, msg) \
157  extern void name (void) __attribute__((__diagnose_if__ (1, msg, "warning")))
158 # define __warnattr(msg) __attribute__((__diagnose_if__ (1, msg, "warning")))
159 # define __errordecl(name, msg) \
160  extern void name (void) __attribute__((__diagnose_if__ (1, msg, "error")))
161 #else
162 # define __warndecl(name, msg) extern void name (void)
163 # define __warnattr(msg)
164 # define __errordecl(name, msg) extern void name (void)
165 #endif
166 
167 /* Support for flexible arrays.
168  Headers that should use flexible arrays only if they're "real"
169  (e.g. only if they won't affect sizeof()) should test
170  #if __glibc_c99_flexarr_available. */
171 #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L && !defined __HP_cc
172 # define __flexarr []
173 # define __glibc_c99_flexarr_available 1
174 #elif __GNUC_PREREQ (2,97) || defined __clang__
175 /* GCC 2.97 and clang support C99 flexible array members as an extension,
176  even when in C89 mode or compiling C++ (any version). */
177 # define __flexarr []
178 # define __glibc_c99_flexarr_available 1
179 #elif defined __GNUC__
180 /* Pre-2.97 GCC did not support C99 flexible arrays but did have
181  an equivalent extension with slightly different notation. */
182 # define __flexarr [0]
183 # define __glibc_c99_flexarr_available 1
184 #else
185 /* Some other non-C99 compiler. Approximate with [1]. */
186 # define __flexarr [1]
187 # define __glibc_c99_flexarr_available 0
188 #endif
189 
190 
191 /* __asm__ ("xyz") is used throughout the headers to rename functions
192  at the assembly language level. This is wrapped by the __REDIRECT
193  macro, in order to support compilers that can do this some other
194  way. When compilers don't support asm-names at all, we have to do
195  preprocessor tricks instead (which don't have exactly the right
196  semantics, but it's the best we can do).
197 
198  Example:
199  int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */
200 
201 #if (defined __GNUC__ && __GNUC__ >= 2) || (__clang_major__ >= 4)
202 
203 # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias))
204 # ifdef __cplusplus
205 # define __REDIRECT_NTH(name, proto, alias) \
206  name proto __THROW __asm__ (__ASMNAME (#alias))
207 # define __REDIRECT_NTHNL(name, proto, alias) \
208  name proto __THROWNL __asm__ (__ASMNAME (#alias))
209 # else
210 # define __REDIRECT_NTH(name, proto, alias) \
211  name proto __asm__ (__ASMNAME (#alias)) __THROW
212 # define __REDIRECT_NTHNL(name, proto, alias) \
213  name proto __asm__ (__ASMNAME (#alias)) __THROWNL
214 # endif
215 # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
216 # define __ASMNAME2(prefix, cname) __STRING (prefix) cname
217 
218 /*
219 #elif __SOME_OTHER_COMPILER__
220 
221 # define __REDIRECT(name, proto, alias) name proto; \
222  _Pragma("let " #name " = " #alias)
223 */
224 #endif
225 
226 /* GCC and clang have various useful declarations that can be made with
227  the '__attribute__' syntax. All of the ways we use this do fine if
228  they are omitted for compilers that don't understand it. */
229 #if !(defined __GNUC__ || defined __clang__)
230 # define __attribute__(xyz) /* Ignore */
231 #endif
232 
233 /* At some point during the gcc 2.96 development the `malloc' attribute
234  for functions was introduced. We don't want to use it unconditionally
235  (although this would be possible) since it generates warnings. */
236 #if __GNUC_PREREQ (2,96) || __glibc_clang_has_attribute (__malloc__)
237 # define __attribute_malloc__ __attribute__ ((__malloc__))
238 #else
239 # define __attribute_malloc__ /* Ignore */
240 #endif
241 
242 /* Tell the compiler which arguments to an allocation function
243  indicate the size of the allocation. */
244 #if __GNUC_PREREQ (4, 3)
245 # define __attribute_alloc_size__(params) \
246  __attribute__ ((__alloc_size__ params))
247 #else
248 # define __attribute_alloc_size__(params) /* Ignore. */
249 #endif
250 
251 /* At some point during the gcc 2.96 development the `pure' attribute
252  for functions was introduced. We don't want to use it unconditionally
253  (although this would be possible) since it generates warnings. */
254 #if __GNUC_PREREQ (2,96) || __glibc_clang_has_attribute (__pure__)
255 # define __attribute_pure__ __attribute__ ((__pure__))
256 #else
257 # define __attribute_pure__ /* Ignore */
258 #endif
259 
260 /* This declaration tells the compiler that the value is constant. */
261 #if __GNUC_PREREQ (2,5) || __glibc_clang_has_attribute (__const__)
262 # define __attribute_const__ __attribute__ ((__const__))
263 #else
264 # define __attribute_const__ /* Ignore */
265 #endif
266 
267 /* At some point during the gcc 3.1 development the `used' attribute
268  for functions was introduced. We don't want to use it unconditionally
269  (although this would be possible) since it generates warnings. */
270 #if __GNUC_PREREQ (3,1) || __glibc_clang_has_attribute (__used__)
271 # define __attribute_used__ __attribute__ ((__used__))
272 # define __attribute_noinline__ __attribute__ ((__noinline__))
273 #else
274 # define __attribute_used__ __attribute__ ((__unused__))
275 # define __attribute_noinline__ /* Ignore */
276 #endif
277 
278 /* Since version 3.2, gcc allows marking deprecated functions. */
279 #if __GNUC_PREREQ (3,2) || __glibc_clang_has_attribute (__deprecated__)
280 # define __attribute_deprecated__ __attribute__ ((__deprecated__))
281 #else
282 # define __attribute_deprecated__ /* Ignore */
283 #endif
284 
285 /* Since version 4.5, gcc also allows one to specify the message printed
286  when a deprecated function is used. clang claims to be gcc 4.2, but
287  may also support this feature. */
288 #if __GNUC_PREREQ (4,5) || \
289  __glibc_clang_has_extension (__attribute_deprecated_with_message__)
290 # define __attribute_deprecated_msg__(msg) \
291  __attribute__ ((__deprecated__ (msg)))
292 #else
293 # define __attribute_deprecated_msg__(msg) __attribute_deprecated__
294 #endif
295 
296 /* At some point during the gcc 2.8 development the `format_arg' attribute
297  for functions was introduced. We don't want to use it unconditionally
298  (although this would be possible) since it generates warnings.
299  If several `format_arg' attributes are given for the same function, in
300  gcc-3.0 and older, all but the last one are ignored. In newer gccs,
301  all designated arguments are considered. */
302 #if __GNUC_PREREQ (2,8) || __glibc_clang_has_attribute (__format_arg__)
303 # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
304 #else
305 # define __attribute_format_arg__(x) /* Ignore */
306 #endif
307 
308 /* At some point during the gcc 2.97 development the `strfmon' format
309  attribute for functions was introduced. We don't want to use it
310  unconditionally (although this would be possible) since it
311  generates warnings. */
312 #if __GNUC_PREREQ (2,97) || __glibc_clang_has_attribute (__format__)
313 # define __attribute_format_strfmon__(a,b) \
314  __attribute__ ((__format__ (__strfmon__, a, b)))
315 #else
316 # define __attribute_format_strfmon__(a,b) /* Ignore */
317 #endif
318 
319 /* The nonnull function attribute marks pointer parameters that
320  must not be NULL. Do not define __nonnull if it is already defined,
321  for portability when this file is used in Gnulib. */
322 #ifndef __nonnull
323 # if __GNUC_PREREQ (3,3) || __glibc_clang_has_attribute (__nonnull__)
324 # define __nonnull(params) __attribute__ ((__nonnull__ params))
325 # else
326 # define __nonnull(params)
327 # endif
328 #endif
329 
330 /* If fortification mode, we warn about unused results of certain
331  function calls which can lead to problems. */
332 #if __GNUC_PREREQ (3,4) || __glibc_clang_has_attribute (__warn_unused_result__)
333 # define __attribute_warn_unused_result__ \
334  __attribute__ ((__warn_unused_result__))
335 # if defined __USE_FORTIFY_LEVEL && __USE_FORTIFY_LEVEL > 0
336 # define __wur __attribute_warn_unused_result__
337 # endif
338 #else
339 # define __attribute_warn_unused_result__ /* empty */
340 #endif
341 #ifndef __wur
342 # define __wur /* Ignore */
343 #endif
344 
345 /* Forces a function to be always inlined. */
346 #if __GNUC_PREREQ (3,2) || __glibc_clang_has_attribute (__always_inline__)
347 /* The Linux kernel defines __always_inline in stddef.h (283d7573), and
348  it conflicts with this definition. Therefore undefine it first to
349  allow either header to be included first. */
350 # undef __always_inline
351 # define __always_inline __inline __attribute__ ((__always_inline__))
352 #else
353 # undef __always_inline
354 # define __always_inline __inline
355 #endif
356 
357 /* Associate error messages with the source location of the call site rather
358  than with the source location inside the function. */
359 #if __GNUC_PREREQ (4,3) || __glibc_clang_has_attribute (__artificial__)
360 # define __attribute_artificial__ __attribute__ ((__artificial__))
361 #else
362 # define __attribute_artificial__ /* Ignore */
363 #endif
364 
365 /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
366  inline semantics, unless -fgnu89-inline is used. Using __GNUC_STDC_INLINE__
367  or __GNUC_GNU_INLINE is not a good enough check for gcc because gcc versions
368  older than 4.3 may define these macros and still not guarantee GNU inlining
369  semantics.
370 
371  clang++ identifies itself as gcc-4.2, but has support for GNU inlining
372  semantics, that can be checked for by using the __GNUC_STDC_INLINE_ and
373  __GNUC_GNU_INLINE__ macro definitions. */
374 #if (!defined __cplusplus || __GNUC_PREREQ (4,3) \
375  || (defined __clang__ && (defined __GNUC_STDC_INLINE__ \
376  || defined __GNUC_GNU_INLINE__)))
377 # if defined __GNUC_STDC_INLINE__ || defined __cplusplus
378 # define __extern_inline extern __inline __attribute__ ((__gnu_inline__))
379 # define __extern_always_inline \
380  extern __always_inline __attribute__ ((__gnu_inline__))
381 # else
382 # define __extern_inline extern __inline
383 # define __extern_always_inline extern __always_inline
384 # endif
385 #endif
386 
387 #ifdef __extern_always_inline
388 # define __fortify_function __extern_always_inline __attribute_artificial__
389 #endif
390 
391 /* GCC 4.3 and above allow passing all anonymous arguments of an
392  __extern_always_inline function to some other vararg function. */
393 #if __GNUC_PREREQ (4,3)
394 # define __va_arg_pack() __builtin_va_arg_pack ()
395 # define __va_arg_pack_len() __builtin_va_arg_pack_len ()
396 #endif
397 
398 /* It is possible to compile containing GCC extensions even if GCC is
399  run in pedantic mode if the uses are carefully marked using the
400  `__extension__' keyword. But this is not generally available before
401  version 2.8. */
402 #if !(__GNUC_PREREQ (2,8) || defined __clang__)
403 # define __extension__ /* Ignore */
404 #endif
405 
406 /* __restrict is known in EGCS 1.2 and above, and in clang.
407  It works also in C++ mode (outside of arrays), but only when spelled
408  as '__restrict', not 'restrict'. */
409 #if !(__GNUC_PREREQ (2,92) || __clang_major__ >= 3)
410 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
411 # define __restrict restrict
412 # else
413 # define __restrict /* Ignore */
414 # endif
415 #endif
416 
417 /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is
418  array_name[restrict]
419  GCC 3.1 and clang support this.
420  This syntax is not usable in C++ mode. */
421 #if (__GNUC_PREREQ (3,1) || __clang_major__ >= 3) && !defined __cplusplus
422 # define __restrict_arr __restrict
423 #else
424 # ifdef __GNUC__
425 # define __restrict_arr /* Not supported in old GCC. */
426 # else
427 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
428 # define __restrict_arr restrict
429 # else
430 /* Some other non-C99 compiler. */
431 # define __restrict_arr /* Not supported. */
432 # endif
433 # endif
434 #endif
435 
436 #if (__GNUC__ >= 3) || __glibc_clang_has_builtin (__builtin_expect)
437 # define __glibc_unlikely(cond) __builtin_expect ((cond), 0)
438 # define __glibc_likely(cond) __builtin_expect ((cond), 1)
439 #else
440 # define __glibc_unlikely(cond) (cond)
441 # define __glibc_likely(cond) (cond)
442 #endif
443 
444 #ifdef __has_attribute
445 # define __glibc_has_attribute(attr) __has_attribute (attr)
446 #else
447 # define __glibc_has_attribute(attr) 0
448 #endif
449 
450 #if (!defined _Noreturn \
451  && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \
452  && !(__GNUC_PREREQ (4,7) \
453  || (3 < __clang_major__ + (5 <= __clang_minor__))))
454 # if __GNUC_PREREQ (2,8)
455 # define _Noreturn __attribute__ ((__noreturn__))
456 # else
457 # define _Noreturn
458 # endif
459 #endif
460 
461 #if __GNUC_PREREQ (8, 0)
462 /* Describes a char array whose address can safely be passed as the first
463  argument to strncpy and strncat, as the char array is not necessarily
464  a NUL-terminated string. */
465 # define __attribute_nonstring__ __attribute__ ((__nonstring__))
466 #else
467 # define __attribute_nonstring__
468 #endif
469 
470 #if (!defined _Static_assert && !defined __cplusplus \
471  && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \
472  && (!(__GNUC_PREREQ (4, 6) || __clang_major__ >= 4) \
473  || defined __STRICT_ANSI__))
474 # define _Static_assert(expr, diagnostic) \
475  extern int (*__Static_assert_function (void)) \
476  [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })]
477 #endif
478 
479 /* The #ifndef lets Gnulib avoid including these on non-glibc
480  platforms, where the includes typically do not exist. */
481 #ifndef __WORDSIZE
482 # include <bits/wordsize.h>
483 # include <bits/long-double.h>
484 #endif
485 
486 #if defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH
487 # define __LDBL_COMPAT 1
488 # ifdef __REDIRECT
489 # define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias)
490 # define __LDBL_REDIR(name, proto) \
491  __LDBL_REDIR1 (name, proto, __nldbl_##name)
492 # define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias)
493 # define __LDBL_REDIR_NTH(name, proto) \
494  __LDBL_REDIR1_NTH (name, proto, __nldbl_##name)
495 # define __LDBL_REDIR1_DECL(name, alias) \
496  extern __typeof (name) name __asm (__ASMNAME (#alias));
497 # define __LDBL_REDIR_DECL(name) \
498  extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name));
499 # define __REDIRECT_LDBL(name, proto, alias) \
500  __LDBL_REDIR1 (name, proto, __nldbl_##alias)
501 # define __REDIRECT_NTH_LDBL(name, proto, alias) \
502  __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias)
503 # endif
504 #endif
505 #if !defined __LDBL_COMPAT || !defined __REDIRECT
506 # define __LDBL_REDIR1(name, proto, alias) name proto
507 # define __LDBL_REDIR(name, proto) name proto
508 # define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW
509 # define __LDBL_REDIR_NTH(name, proto) name proto __THROW
510 # define __LDBL_REDIR_DECL(name)
511 # ifdef __REDIRECT
512 # define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias)
513 # define __REDIRECT_NTH_LDBL(name, proto, alias) \
514  __REDIRECT_NTH (name, proto, alias)
515 # endif
516 #endif
517 
518 /* __glibc_macro_warning (MESSAGE) issues warning MESSAGE. This is
519  intended for use in preprocessor macros.
520 
521  Note: MESSAGE must be a _single_ string; concatenation of string
522  literals is not supported. */
523 #if __GNUC_PREREQ (4,8) || __glibc_clang_prereq (3,5)
524 # define __glibc_macro_warning1(message) _Pragma (#message)
525 # define __glibc_macro_warning(message) \
526  __glibc_macro_warning1 (GCC warning message)
527 #else
528 # define __glibc_macro_warning(msg)
529 #endif
530 
531 /* Generic selection (ISO C11) is a C-only feature, available in GCC
532  since version 4.9. Previous versions do not provide generic
533  selection, even though they might set __STDC_VERSION__ to 201112L,
534  when in -std=c11 mode. Thus, we must check for !defined __GNUC__
535  when testing __STDC_VERSION__ for generic selection support.
536  On the other hand, Clang also defines __GNUC__, so a clang-specific
537  check is required to enable the use of generic selection. */
538 #if !defined __cplusplus \
539  && (__GNUC_PREREQ (4, 9) \
540  || __glibc_clang_has_extension (c_generic_selections) \
541  || (!defined __GNUC__ && defined __STDC_VERSION__ \
542  && __STDC_VERSION__ >= 201112L))
543 # define __HAVE_GENERIC_SELECTION 1
544 #else
545 # define __HAVE_GENERIC_SELECTION 0
546 #endif
547 
548 #endif /* sys/cdefs.h */