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: stable/4/sys/sys/cdefs.h 137754 2004-11-15 22:11:08Z ru $
   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).
  114  */
  115 #if __GNUC__ < 2 || __GNUC__ == 2 && __GNUC_MINOR__ < 5
  116 #define __dead2
  117 #define __pure2
  118 #define __unused
  119 #endif
  120 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7
  121 #define __dead2         __attribute__((__noreturn__))
  122 #define __pure2         __attribute__((__const__))
  123 #define __unused
  124 #endif
  125 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 7 || __GNUC__ == 3
  126 #define __dead2         __attribute__((__noreturn__))
  127 #define __pure2         __attribute__((__const__))
  128 #define __unused        __attribute__((__unused__))
  129 #endif
  130 
  131 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
  132 #if !(__GNUC__ == 2 && __GNUC_MINOR__ >= 7 || __GNUC__ >= 3)
  133 #define __func__        NULL
  134 #endif
  135 
  136 #if __GNUC__ >= 2 && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
  137 #define __LONG_LONG_SUPPORTED
  138 #endif
  139 
  140 /*
  141  * GCC 2.95 provides `__restrict' as an extention to C90 to support the
  142  * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
  143  * a way to define the `restrict' type qualifier without disturbing older
  144  * software that is unaware of C99 keywords.
  145  */
  146 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
  147 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901
  148 #define __restrict
  149 #else
  150 #define __restrict      restrict
  151 #endif
  152 #endif
  153 
  154 /*
  155  * Compiler-dependent macros to declare that functions take printf-like
  156  * or scanf-like arguments.  They are null except for versions of gcc
  157  * that are known to support the features properly (old versions of gcc-2
  158  * didn't permit keeping the keywords out of the application namespace).
  159  */
  160 #if __GNUC__ < 2 || __GNUC__ == 2 && __GNUC_MINOR__ < 7
  161 #define __printflike(fmtarg, firstvararg)
  162 #define __scanflike(fmtarg, firstvararg)
  163 #else
  164 #define __printflike(fmtarg, firstvararg) \
  165             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  166 #define __scanflike(fmtarg, firstvararg) \
  167             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  168 #endif
  169 
  170 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  171 #if __FreeBSD_cc_version >= 300001
  172 #define __printf0like(fmtarg, firstvararg) \
  173             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  174 #else
  175 #define __printf0like(fmtarg, firstvararg)
  176 #endif
  177 
  178 #ifdef __GNUC__
  179 #define __strong_reference(sym,aliassym)        \
  180         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)));
  181 #ifdef __ELF__
  182 #ifdef __STDC__
  183 #define __weak_reference(sym,alias)     \
  184         __asm__(".weak " #alias);       \
  185         __asm__(".equ "  #alias ", " #sym)
  186 #define __warn_references(sym,msg)      \
  187         __asm__(".section .gnu.warning." #sym); \
  188         __asm__(".asciz \"" msg "\"");  \
  189         __asm__(".previous")
  190 #else
  191 #define __weak_reference(sym,alias)     \
  192         __asm__(".weak alias");         \
  193         __asm__(".equ alias, sym")
  194 #define __warn_references(sym,msg)      \
  195         __asm__(".section .gnu.warning.sym"); \
  196         __asm__(".asciz \"msg\"");      \
  197         __asm__(".previous")
  198 #endif  /* __STDC__ */
  199 #else   /* !__ELF__ */
  200 #ifdef __STDC__
  201 #define __weak_reference(sym,alias)     \
  202         __asm__(".stabs \"_" #alias "\",11,0,0,0");     \
  203         __asm__(".stabs \"_" #sym "\",1,0,0,0")
  204 #define __warn_references(sym,msg)      \
  205         __asm__(".stabs \"" msg "\",30,0,0,0");         \
  206         __asm__(".stabs \"_" #sym "\",1,0,0,0")
  207 #else
  208 #define __weak_reference(sym,alias)     \
  209         __asm__(".stabs \"_/**/alias\",11,0,0,0");      \
  210         __asm__(".stabs \"_/**/sym\",1,0,0,0")
  211 #define __warn_references(sym,msg)      \
  212         __asm__(".stabs msg,30,0,0,0");                 \
  213         __asm__(".stabs \"_/**/sym\",1,0,0,0")
  214 #endif  /* __STDC__ */
  215 #endif  /* __ELF__ */
  216 #endif  /* __GNUC__ */
  217 
  218 #if defined(__GNUC__) && defined(__ELF__)
  219 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
  220 #else
  221 #define __IDSTRING(name,string) static const char name[] __unused = string
  222 #endif
  223 
  224 #ifndef __RCSID
  225 #define __RCSID(s)      __IDSTRING(rcsid,s)
  226 #endif
  227 
  228 /*
  229  * Embed the rcs id of a source file in the resulting library.  Note that in
  230  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
  231  * Usage:
  232  *      __FBSDID("$FreeBSD: stable/4/sys/sys/cdefs.h 137754 2004-11-15 22:11:08Z ru $");
  233  */
  234 #ifndef __FBSDID
  235 #if !defined(lint) && !defined(STRIP_FBSDID)
  236 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  237 #else
  238 #define __FBSDID(s)     struct __hack
  239 #endif
  240 #endif
  241 
  242 #ifndef __RCSID_SOURCE
  243 #define __RCSID_SOURCE(s) __IDSTRING(rcsid_source,s)
  244 #endif
  245 
  246 #ifndef __COPYRIGHT
  247 #define __COPYRIGHT(s)  __IDSTRING(copyright,s)
  248 #endif
  249 
  250 /*-
  251  * The following definitions are an extension of the behavior originally
  252  * implemented in <sys/_posix.h>, but with a different level of granularity.
  253  * POSIX.1 requires that the macros we test be defined before any standard
  254  * header file is included.
  255  *
  256  * Here's a quick run-down of the versions:
  257  *  defined(_POSIX_SOURCE)              1003.1-1988
  258  *  _POSIX_C_SOURCE == 1                1003.1-1990
  259  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
  260  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
  261  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
  262  *                                      and the omnibus ISO/IEC 9945-1: 1996
  263  *  _POSIX_C_SOURCE == 200112           1003.1-2001
  264  *
  265  * In addition, the X/Open Portability Guide, which is now the Single UNIX
  266  * Specification, defines a feature-test macro which indicates the version of
  267  * that specification, and which subsumes _POSIX_C_SOURCE.
  268  *
  269  * Our macros begin with two underscores to avoid namespace screwage.
  270  */
  271 
  272 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  273 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
  274 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
  275 #define _POSIX_C_SOURCE         199009
  276 #endif
  277 
  278 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  279 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
  280 #undef _POSIX_C_SOURCE
  281 #define _POSIX_C_SOURCE         199209
  282 #endif
  283 
  284 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  285 #ifdef _XOPEN_SOURCE
  286 #if _XOPEN_SOURCE - 0 >= 600
  287 #define __XSI_VISIBLE           600
  288 #undef _POSIX_C_SOURCE
  289 #define _POSIX_C_SOURCE         200112
  290 #elif _XOPEN_SOURCE - 0 >= 500
  291 #define __XSI_VISIBLE           500
  292 #undef _POSIX_C_SOURCE
  293 #define _POSIX_C_SOURCE         199506
  294 #endif
  295 #endif
  296 
  297 /*
  298  * Deal with all versions of POSIX.  The ordering relative to the tests above is
  299  * important.
  300  */
  301 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  302 #define _POSIX_C_SOURCE         198808
  303 #endif
  304 #ifdef _POSIX_C_SOURCE
  305 #if _POSIX_C_SOURCE >= 200112
  306 #define __POSIX_VISIBLE         200112
  307 #define __ISO_C_VISIBLE         1999
  308 #elif _POSIX_C_SOURCE >= 199506
  309 #define __POSIX_VISIBLE         199506
  310 #define __ISO_C_VISIBLE         1990
  311 #elif _POSIX_C_SOURCE >= 199309
  312 #define __POSIX_VISIBLE         199309
  313 #define __ISO_C_VISIBLE         1990
  314 #elif _POSIX_C_SOURCE >= 199209
  315 #define __POSIX_VISIBLE         199209
  316 #define __ISO_C_VISIBLE         1990
  317 #elif _POSIX_C_SOURCE >= 199009
  318 #define __POSIX_VISIBLE         199009
  319 #define __ISO_C_VISIBLE         1990
  320 #else
  321 #define __POSIX_VISIBLE         198808
  322 #define __ISO_C_VISIBLE         0
  323 #endif /* _POSIX_C_SOURCE */
  324 #else
  325 /*-
  326  * Deal with _ANSI_SOURCE:
  327  * If it is defined, and no other compilation environment is explicitly
  328  * requested, then define our internal feature-test macros to zero.  This
  329  * makes no difference to the preprocessor (undefined symbols in preprocessing
  330  * expressions are defined to have value zero), but makes it more convenient for
  331  * a test program to print out the values.
  332  *
  333  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
  334  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
  335  * environment (and in fact we will never get here).
  336  */
  337 #ifdef _ANSI_SOURCE             /* Hide almost everything. */
  338 #define __POSIX_VISIBLE         0
  339 #define __XSI_VISIBLE           0
  340 #define __BSD_VISIBLE           0
  341 #define __ISO_C_VISIBLE         1990
  342 #else                           /* Default environment: show everything. */
  343 #define __POSIX_VISIBLE         200112
  344 #define __XSI_VISIBLE           600
  345 #define __BSD_VISIBLE           1
  346 #define __ISO_C_VISIBLE         1999
  347 #endif
  348 #endif
  349 
  350 #endif /* !_SYS_CDEFS_H_ */

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