The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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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  * 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.
   23  *
   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
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)cdefs.h     8.8 (Berkeley) 1/9/95
   37  * $FreeBSD: releng/5.0/sys/sys/cdefs.h 105654 2002-10-21 20:50:30Z mike $
   38  */
   39 
   40 #ifndef _SYS_CDEFS_H_
   41 #define _SYS_CDEFS_H_
   42 
   43 #if defined(__cplusplus)
   44 #define __BEGIN_DECLS   extern "C" {
   45 #define __END_DECLS     }
   46 #else
   47 #define __BEGIN_DECLS
   48 #define __END_DECLS
   49 #endif
   50 
   51 /*
   52  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
   53  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
   54  * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
   55  * mode -- there must be no spaces between its arguments, and for nested
   56  * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
   57  * concatenate double-quoted strings produced by the __STRING macro, but
   58  * this only works with ANSI C.
   59  *
   60  * __XSTRING is like __STRING, but it expands any macros in its argument
   61  * first.  It is only available with ANSI C.
   62  */
   63 #if defined(__STDC__) || defined(__cplusplus)
   64 #define __P(protos)     protos          /* full-blown ANSI C */
   65 #define __CONCAT1(x,y)  x ## y
   66 #define __CONCAT(x,y)   __CONCAT1(x,y)
   67 #define __STRING(x)     #x              /* stringify without expanding x */
   68 #define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */
   69 
   70 #define __const         const           /* define reserved names to standard */
   71 #define __signed        signed
   72 #define __volatile      volatile
   73 #if defined(__cplusplus)
   74 #define __inline        inline          /* convert to C++ keyword */
   75 #else
   76 #ifndef __GNUC__
   77 #define __inline                        /* delete GCC keyword */
   78 #endif /* !__GNUC__ */
   79 #endif /* !__cplusplus */
   80 
   81 #else   /* !(__STDC__ || __cplusplus) */
   82 #define __P(protos)     ()              /* traditional C preprocessor */
   83 #define __CONCAT(x,y)   x/**/y
   84 #define __STRING(x)     "x"
   85 
   86 #ifndef __GNUC__
   87 #define __const                         /* delete pseudo-ANSI C keywords */
   88 #define __inline
   89 #define __signed
   90 #define __volatile
   91 /*
   92  * In non-ANSI C environments, new programs will want ANSI-only C keywords
   93  * deleted from the program and old programs will want them left alone.
   94  * When using a compiler other than gcc, programs using the ANSI C keywords
   95  * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
   96  * When using "gcc -traditional", we assume that this is the intent; if
   97  * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
   98  */
   99 #ifndef NO_ANSI_KEYWORDS
  100 #define const                           /* delete ANSI C keywords */
  101 #define inline
  102 #define signed
  103 #define volatile
  104 #endif  /* !NO_ANSI_KEYWORDS */
  105 #endif  /* !__GNUC__ */
  106 #endif  /* !(__STDC__ || __cplusplus) */
  107 
  108 /*
  109  * Compiler-dependent macros to help declare dead (non-returning) and
  110  * pure (no side effects) functions, and unused variables.  They are
  111  * null except for versions of gcc that are known to support the features
  112  * properly (old versions of gcc-2 supported the dead and pure features
  113  * in a different (wrong) way).  If we do not provide an implementation
  114  * for a given compiler, let the compile fail if it is told to use
  115  * a feature that we cannot live without.
  116  */
  117 #ifdef lint
  118 #define __dead2
  119 #define __pure2
  120 #define __unused
  121 #define __packed
  122 #define __aligned(x)
  123 #define __section(x)
  124 #else
  125 #if __GNUC__ < 2 || __GNUC__ == 2 && __GNUC_MINOR__ < 5
  126 #define __dead2
  127 #define __pure2
  128 #define __unused
  129 #endif
  130 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7
  131 #define __dead2         __attribute__((__noreturn__))
  132 #define __pure2         __attribute__((__const__))
  133 #define __unused
  134 /* XXX Find out what to do for __packed, __aligned and __section */
  135 #endif
  136 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 7 || __GNUC__ == 3
  137 #define __dead2         __attribute__((__noreturn__))
  138 #define __pure2         __attribute__((__const__))
  139 #define __unused        __attribute__((__unused__))
  140 #define __packed        __attribute__((__packed__))
  141 #define __aligned(x)    __attribute__((__aligned__(x)))
  142 #define __section(x)    __attribute__((__section__(x)))
  143 #endif
  144 #endif
  145 
  146 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
  147 #if !(__GNUC__ == 2 && __GNUC_MINOR__ >= 7 || __GNUC__ >= 3)
  148 #define __func__        NULL
  149 #endif
  150 
  151 #if __GNUC__ >= 2 && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
  152 #define __LONG_LONG_SUPPORTED
  153 #endif
  154 
  155 /*
  156  * GCC 2.95 provides `__restrict' as an extension to C90 to support the
  157  * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
  158  * a way to define the `restrict' type qualifier without disturbing older
  159  * software that is unaware of C99 keywords.
  160  */
  161 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
  162 #if __STDC_VERSION__ < 199901
  163 #define __restrict
  164 #else
  165 #define __restrict      restrict
  166 #endif
  167 #endif
  168 
  169 /*
  170  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  171  * require it.
  172  */
  173 #define __offsetof(type, field) ((size_t)(&((type *)0)->field))
  174 
  175 /*
  176  * Compiler-dependent macros to declare that functions take printf-like
  177  * or scanf-like arguments.  They are null except for versions of gcc
  178  * that are known to support the features properly (old versions of gcc-2
  179  * didn't permit keeping the keywords out of the application namespace).
  180  */
  181 #if __GNUC__ < 2 || __GNUC__ == 2 && __GNUC_MINOR__ < 7
  182 #define __printflike(fmtarg, firstvararg)
  183 #define __scanflike(fmtarg, firstvararg)
  184 #else
  185 #define __printflike(fmtarg, firstvararg) \
  186             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  187 #define __scanflike(fmtarg, firstvararg) \
  188             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  189 #endif
  190 
  191 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  192 #if __FreeBSD_cc_version >= 300001 && __FreeBSD_cc_version < 500003
  193 #define __printf0like(fmtarg, firstvararg) \
  194             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  195 #else
  196 #define __printf0like(fmtarg, firstvararg)
  197 #endif
  198 
  199 #ifdef __GNUC__
  200 #define __strong_reference(sym,aliassym)        \
  201         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)));
  202 #ifdef __STDC__
  203 #define __weak_reference(sym,alias)     \
  204         __asm__(".weak " #alias);       \
  205         __asm__(".equ "  #alias ", " #sym)
  206 #define __warn_references(sym,msg)      \
  207         __asm__(".section .gnu.warning." #sym); \
  208         __asm__(".asciz \"" msg "\"");  \
  209         __asm__(".previous")
  210 #else
  211 #define __weak_reference(sym,alias)     \
  212         __asm__(".weak alias");         \
  213         __asm__(".equ alias, sym")
  214 #define __warn_references(sym,msg)      \
  215         __asm__(".section .gnu.warning.sym"); \
  216         __asm__(".asciz \"msg\"");      \
  217         __asm__(".previous")
  218 #endif  /* __STDC__ */
  219 #endif  /* __GNUC__ */
  220 
  221 #ifdef __GNUC__
  222 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
  223 #else
  224 /*
  225  * This doesn't work in header files. But it may be better than nothing.
  226  * The alternative is: #define __IDSTRING(name,string)  [nothing]
  227  */
  228 #define __IDSTRING(name,string) static const char name[] __unused = string
  229 #endif
  230 
  231 /*
  232  * Embed the rcs id of a source file in the resulting library.  Note that in
  233  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
  234  * Usage:
  235  *      __FBSDID("$FreeBSD: releng/5.0/sys/sys/cdefs.h 105654 2002-10-21 20:50:30Z mike $");
  236  */
  237 #ifndef __FBSDID
  238 #if !defined(lint) && !defined(STRIP_FBSDID)
  239 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  240 #else
  241 #define __FBSDID(s)     struct __hack
  242 #endif
  243 #endif
  244 
  245 #ifndef __RCSID
  246 #ifndef NO__RCSID
  247 #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  248 #else
  249 #define __RCSID(s)
  250 #endif
  251 #endif
  252 
  253 #ifndef __RCSID_SOURCE
  254 #ifndef NO__RCSID_SOURCE
  255 #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
  256 #else
  257 #define __RCSID_SOURCE(s)
  258 #endif
  259 #endif
  260 
  261 #ifndef __SCCSID
  262 #ifndef NO__SCCSID
  263 #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
  264 #else
  265 #define __SCCSID(s)
  266 #endif
  267 #endif
  268 
  269 #ifndef __COPYRIGHT
  270 #ifndef NO__COPYRIGHT
  271 #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
  272 #else
  273 #define __COPYRIGHT(s)
  274 #endif
  275 #endif
  276 
  277 #ifndef __DECONST
  278 #define __DECONST(type, var)    ((type)(uintptr_t)(const void *)(var))
  279 #endif
  280 
  281 #ifndef __DEVOLATILE
  282 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
  283 #endif
  284 
  285 #ifndef __DEQUALIFY
  286 #define __DEQUALIFY(type, var)  ((type)(uintptr_t)(const volatile void *)(var))
  287 #endif
  288 
  289 /*-
  290  * The following definitions are an extension of the behavior originally
  291  * implemented in <sys/_posix.h>, but with a different level of granularity.
  292  * POSIX.1 requires that the macros we test be defined before any standard
  293  * header file is included.
  294  *
  295  * Here's a quick run-down of the versions:
  296  *  defined(_POSIX_SOURCE)              1003.1-1988
  297  *  _POSIX_C_SOURCE == 1                1003.1-1990
  298  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
  299  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
  300  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
  301  *                                      and the omnibus ISO/IEC 9945-1: 1996
  302  *  _POSIX_C_SOURCE == 200112           1003.1-2001
  303  *
  304  * In addition, the X/Open Portability Guide, which is now the Single UNIX
  305  * Specification, defines a feature-test macro which indicates the version of
  306  * that specification, and which subsumes _POSIX_C_SOURCE.
  307  *
  308  * Our macros begin with two underscores to avoid namespace screwage.
  309  */
  310 
  311 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  312 #if _POSIX_C_SOURCE == 1
  313 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
  314 #define _POSIX_C_SOURCE         199009
  315 #endif
  316 
  317 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  318 #if _POSIX_C_SOURCE == 2
  319 #undef _POSIX_C_SOURCE
  320 #define _POSIX_C_SOURCE         199209
  321 #endif
  322 
  323 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  324 #ifdef _XOPEN_SOURCE
  325 #if _XOPEN_SOURCE - 0 >= 600
  326 #define __XSI_VISIBLE           600
  327 #undef _POSIX_C_SOURCE
  328 #define _POSIX_C_SOURCE         200112
  329 #elif _XOPEN_SOURCE - 0 >= 500
  330 #define __XSI_VISIBLE           500
  331 #undef _POSIX_C_SOURCE
  332 #define _POSIX_C_SOURCE         199506
  333 #endif
  334 #endif
  335 
  336 /*
  337  * Deal with all versions of POSIX.  The ordering relative to the tests above is
  338  * important.
  339  */
  340 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  341 #define _POSIX_C_SOURCE         198808
  342 #endif
  343 #ifdef _POSIX_C_SOURCE
  344 #if _POSIX_C_SOURCE >= 200112
  345 #define __POSIX_VISIBLE         200112
  346 #define __ISO_C_VISIBLE         1999
  347 #elif _POSIX_C_SOURCE >= 199506
  348 #define __POSIX_VISIBLE         199506
  349 #define __ISO_C_VISIBLE         1990
  350 #elif _POSIX_C_SOURCE >= 199309
  351 #define __POSIX_VISIBLE         199309
  352 #define __ISO_C_VISIBLE         1990
  353 #elif _POSIX_C_SOURCE >= 199209
  354 #define __POSIX_VISIBLE         199209
  355 #define __ISO_C_VISIBLE         1990
  356 #elif _POSIX_C_SOURCE >= 199009
  357 #define __POSIX_VISIBLE         199009
  358 #define __ISO_C_VISIBLE         1990
  359 #else
  360 #define __POSIX_VISIBLE         198808
  361 #define __ISO_C_VISIBLE         0
  362 #endif /* _POSIX_C_SOURCE */
  363 #else
  364 /*-
  365  * Deal with _ANSI_SOURCE:
  366  * If it is defined, and no other compilation environment is explicitly
  367  * requested, then define our internal feature-test macros to zero.  This
  368  * makes no difference to the preprocessor (undefined symbols in preprocessing
  369  * expressions are defined to have value zero), but makes it more convenient for
  370  * a test program to print out the values.
  371  *
  372  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
  373  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
  374  * environment (and in fact we will never get here).
  375  */
  376 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
  377 #define __POSIX_VISIBLE         0
  378 #define __XSI_VISIBLE           0
  379 #define __BSD_VISIBLE           0
  380 #define __ISO_C_VISIBLE         1990
  381 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
  382 #define __POSIX_VISIBLE         0
  383 #define __XSI_VISIBLE           0
  384 #define __BSD_VISIBLE           0
  385 #define __ISO_C_VISIBLE         1999
  386 #else                           /* Default environment: show everything. */
  387 #define __POSIX_VISIBLE         200112
  388 #define __XSI_VISIBLE           600
  389 #define __BSD_VISIBLE           1
  390 #define __ISO_C_VISIBLE         1999
  391 #endif
  392 #endif
  393 
  394 #endif /* !_SYS_CDEFS_H_ */

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