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  * $FreeBSD$
   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 || __GNUC__ >= 3
  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
  126 #define __dead2         __attribute__((__noreturn__))
  127 #define __pure2         __attribute__((__const__))
  128 #define __unused        __attribute__((__unused__))
  129 #endif
  130 
  131 /*
  132  * Compiler-dependent macros to declare that functions take printf-like
  133  * or scanf-like arguments.  They are null except for versions of gcc
  134  * that are known to support the features properly (old versions of gcc-2
  135  * didn't permit keeping the keywords out of the application namespace).
  136  */
  137 #if __GNUC__ < 2 || __GNUC__ == 2 && __GNUC_MINOR__ < 7
  138 #define __printflike(fmtarg, firstvararg)
  139 #define __scanflike(fmtarg, firstvararg)
  140 #else
  141 #define __printflike(fmtarg, firstvararg) \
  142             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  143 #define __scanflike(fmtarg, firstvararg) \
  144             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  145 #endif
  146 
  147 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  148 #if __FreeBSD_cc_version >= 300001
  149 #define __printf0like(fmtarg, firstvararg) \
  150             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  151 #else
  152 #define __printf0like(fmtarg, firstvararg)
  153 #endif
  154 
  155 #ifdef __GNUC__
  156 #ifdef __ELF__
  157 #ifdef __STDC__
  158 #define __weak_reference(sym,alias)     \
  159         __asm__(".weak " #alias);       \
  160         __asm__(".equ "  #alias ", " #sym)
  161 #define __warn_references(sym,msg)      \
  162         __asm__(".section .gnu.warning." #sym); \
  163         __asm__(".asciz \"" msg "\"");  \
  164         __asm__(".previous")
  165 #else
  166 #define __weak_reference(sym,alias)     \
  167         __asm__(".weak alias");         \
  168         __asm__(".equ alias, sym")
  169 #define __warn_references(sym,msg)      \
  170         __asm__(".section .gnu.warning.sym"); \
  171         __asm__(".asciz \"msg\"");      \
  172         __asm__(".previous")
  173 #endif  /* __STDC__ */
  174 #else   /* !__ELF__ */
  175 #ifdef __STDC__
  176 #define __weak_reference(sym,alias)     \
  177         __asm__(".stabs \"_" #alias "\",11,0,0,0");     \
  178         __asm__(".stabs \"_" #sym "\",1,0,0,0")
  179 #define __warn_references(sym,msg)      \
  180         __asm__(".stabs \"" msg "\",30,0,0,0");         \
  181         __asm__(".stabs \"_" #sym "\",1,0,0,0")
  182 #else
  183 #define __weak_reference(sym,alias)     \
  184         __asm__(".stabs \"_/**/alias\",11,0,0,0");      \
  185         __asm__(".stabs \"_/**/sym\",1,0,0,0")
  186 #define __warn_references(sym,msg)      \
  187         __asm__(".stabs msg,30,0,0,0");                 \
  188         __asm__(".stabs \"_/**/sym\",1,0,0,0")
  189 #endif  /* __STDC__ */
  190 #endif  /* __ELF__ */
  191 #endif  /* __GNUC__ */
  192 
  193 #define __IDSTRING(name,string) static const char name[] __unused = string
  194 
  195 #ifndef __RCSID
  196 #define __RCSID(s)      __IDSTRING(rcsid,s)
  197 #endif
  198 
  199 #ifndef __RCSID_SOURCE
  200 #define __RCSID_SOURCE(s) __IDSTRING(rcsid_source,s)
  201 #endif
  202 
  203 #ifndef __COPYRIGHT
  204 #define __COPYRIGHT(s)  __IDSTRING(copyright,s)
  205 #endif
  206 
  207 #endif /* !_SYS_CDEFS_H_ */

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