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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sys/sys/cdefs.h

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    1 /*      $OpenBSD: cdefs.h,v 1.26 2007/09/18 19:55:16 otto Exp $ */
    2 /*      $NetBSD: cdefs.h,v 1.16 1996/04/03 20:46:39 christos Exp $      */
    3 
    4 /*
    5  * Copyright (c) 1991, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * This code is derived from software contributed to Berkeley by
    9  * Berkeley Software Design, Inc.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  *      @(#)cdefs.h     8.7 (Berkeley) 1/21/94
   36  */
   37 
   38 #ifndef _SYS_CDEFS_H_
   39 #define _SYS_CDEFS_H_
   40 
   41 #include <machine/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  * Macro to test if we're using a specific version of gcc or later.
   53  */
   54 #ifdef __GNUC__
   55 #define __GNUC_PREREQ__(ma, mi) \
   56         ((__GNUC__ > (ma)) || (__GNUC__ == (ma) && __GNUC_MINOR__ >= (mi)))
   57 #else
   58 #define __GNUC_PREREQ__(ma, mi) 0
   59 #endif
   60 
   61 /*
   62  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
   63  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
   64  * The __CONCAT macro is a bit tricky -- make sure you don't put spaces
   65  * in between its arguments.  __CONCAT can also concatenate double-quoted
   66  * strings produced by the __STRING macro, but this only works with ANSI C.
   67  */
   68 #if defined(__STDC__) || defined(__cplusplus)
   69 #define __P(protos)     protos          /* full-blown ANSI C */
   70 #define __CONCAT(x,y)   x ## y
   71 #define __STRING(x)     #x
   72 
   73 #define __const         const           /* define reserved names to standard */
   74 #define __signed        signed
   75 #define __volatile      volatile
   76 #if defined(__cplusplus) || defined(__PCC__)
   77 #define __inline        inline          /* convert to C++ keyword */
   78 #else
   79 #if !defined(__GNUC__) && !defined(lint)
   80 #define __inline                        /* delete GCC keyword */
   81 #endif /* !__GNUC__ && !lint */
   82 #endif /* !__cplusplus */
   83 
   84 #else   /* !(__STDC__ || __cplusplus) */
   85 #define __P(protos)     ()              /* traditional C preprocessor */
   86 #define __CONCAT(x,y)   x/**/y
   87 #define __STRING(x)     "x"
   88 
   89 #if !defined(__GNUC__) && !defined(lint)
   90 #define __const                         /* delete pseudo-ANSI C keywords */
   91 #define __inline
   92 #define __signed
   93 #define __volatile
   94 #endif  /* !__GNUC__ && !lint */
   95 
   96 /*
   97  * In non-ANSI C environments, new programs will want ANSI-only C keywords
   98  * deleted from the program and old programs will want them left alone.
   99  * Programs using the ANSI C keywords const, inline etc. as normal
  100  * identifiers should define -DNO_ANSI_KEYWORDS.
  101  */
  102 #ifndef NO_ANSI_KEYWORDS
  103 #define const           __const         /* convert ANSI C keywords */
  104 #define inline          __inline
  105 #define signed          __signed
  106 #define volatile        __volatile
  107 #endif /* !NO_ANSI_KEYWORDS */
  108 #endif  /* !(__STDC__ || __cplusplus) */
  109 
  110 /*
  111  * GCC1 and some versions of GCC2 declare dead (non-returning) and
  112  * pure (no side effects) functions using "volatile" and "const";
  113  * unfortunately, these then cause warnings under "-ansi -pedantic".
  114  * GCC >= 2.5 uses the __attribute__((attrs)) style.  All of these
  115  * work for GNU C++ (modulo a slight glitch in the C++ grammar in
  116  * the distribution version of 2.5.5).
  117  */
  118 
  119 #if !__GNUC_PREREQ__(2, 5)
  120 #define __attribute__(x)        /* delete __attribute__ if non-gcc or gcc1 */
  121 #if defined(__GNUC__) && !defined(__STRICT_ANSI__)
  122 #define __dead          __volatile
  123 #define __pure          __const
  124 #elif defined(lint)
  125 #define __dead          /* NORETURN */
  126 #endif
  127 #elif !defined(__STRICT_ANSI__)
  128 #define __dead          __attribute__((__noreturn__))
  129 #define __pure          __attribute__((__const__))
  130 #endif
  131 
  132 /*
  133  * GNU C version 2.96 adds explicit branch prediction so that
  134  * the CPU back-end can hint the processor and also so that
  135  * code blocks can be reordered such that the predicted path
  136  * sees a more linear flow, thus improving cache behavior, etc.
  137  *
  138  * The following two macros provide us with a way to utilize this
  139  * compiler feature.  Use __predict_true() if you expect the expression
  140  * to evaluate to true, and __predict_false() if you expect the
  141  * expression to evaluate to false.
  142  *
  143  * A few notes about usage:
  144  *
  145  *      * Generally, __predict_false() error condition checks (unless
  146  *        you have some _strong_ reason to do otherwise, in which case
  147  *        document it), and/or __predict_true() `no-error' condition
  148  *        checks, assuming you want to optimize for the no-error case.
  149  *
  150  *      * Other than that, if you don't know the likelihood of a test
  151  *        succeeding from empirical or other `hard' evidence, don't
  152  *        make predictions.
  153  *
  154  *      * These are meant to be used in places that are run `a lot'.
  155  *        It is wasteful to make predictions in code that is run
  156  *        seldomly (e.g. at subsystem initialization time) as the
  157  *        basic block reordering that this affects can often generate
  158  *        larger code.
  159  */
  160 #if __GNUC_PREREQ__(2, 96)
  161 #define __predict_true(exp)     __builtin_expect(((exp) != 0), 1)
  162 #define __predict_false(exp)    __builtin_expect(((exp) != 0), 0)
  163 #else
  164 #define __predict_true(exp)     ((exp) != 0)
  165 #define __predict_false(exp)    ((exp) != 0)
  166 #endif
  167 
  168 /* Delete pseudo-keywords wherever they are not available or needed. */
  169 #ifndef __dead
  170 #define __dead
  171 #define __pure
  172 #endif
  173 
  174 #if __GNUC_PREREQ__(2, 7)
  175 #define __packed        __attribute__((__packed__))
  176 #elif defined(lint)
  177 #define __packed
  178 #endif
  179 
  180 #if !__GNUC_PREREQ__(2, 8)
  181 #define __extension__
  182 #endif
  183 
  184 #if __GNUC_PREREQ__(2, 8)
  185 #define __statement(x)  __extension__(x)
  186 #elif defined(lint)
  187 #define __statement(x)  (0)
  188 #else
  189 #define __statement(x)  (x)
  190 #endif
  191 
  192 #if __GNUC_PREREQ__(3, 0)
  193 #define __malloc        __attribute__((__malloc__))
  194 #else
  195 #define __malloc
  196 #endif
  197 
  198 /*
  199  * "The nice thing about standards is that there are so many to choose from."
  200  * There are a number of "feature test macros" specified by (different)
  201  * standards that determine which interfaces and types the header files
  202  * should expose.
  203  *
  204  * Because of inconsistencies in these macros, we define our own
  205  * set in the private name space that end in _VISIBLE.  These are
  206  * always defined and so headers can test their values easily.
  207  * Things can get tricky when multiple feature macros are defined.
  208  * We try to take the union of all the features requested.
  209  *
  210  * The following macros are guaranteed to have a value after cdefs.h
  211  * has been included:
  212  *      __POSIX_VISIBLE
  213  *      __XPG_VISIBLE
  214  *      __ISO_C_VISIBLE
  215  *      __BSD_VISIBLE
  216  */
  217 
  218 /*
  219  * X/Open Portability Guides and Single Unix Specifications.
  220  * _XOPEN_SOURCE                                XPG3
  221  * _XOPEN_SOURCE && _XOPEN_VERSION = 4          XPG4
  222  * _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED = 1  XPG4v2
  223  * _XOPEN_SOURCE == 500                         XPG5
  224  * _XOPEN_SOURCE == 520                         XPG5v2
  225  * _XOPEN_SOURCE == 600                         POSIX 1003.1-2001 with XSI
  226  *
  227  * The XPG spec implies a specific value for _POSIX_C_SOURCE.
  228  */
  229 #ifdef _XOPEN_SOURCE
  230 # if (_XOPEN_SOURCE - 0 >= 600)
  231 #  define __XPG_VISIBLE         600
  232 #  undef _POSIX_C_SOURCE
  233 #  define _POSIX_C_SOURCE       200112L
  234 # elif (_XOPEN_SOURCE - 0 >= 520)
  235 #  define __XPG_VISIBLE         520
  236 #  undef _POSIX_C_SOURCE
  237 #  define _POSIX_C_SOURCE       199506L
  238 # elif (_XOPEN_SOURCE - 0 >= 500)
  239 #  define __XPG_VISIBLE         500
  240 #  undef _POSIX_C_SOURCE
  241 #  define _POSIX_C_SOURCE       199506L
  242 # elif (_XOPEN_SOURCE_EXTENDED - 0 == 1)
  243 #  define __XPG_VISIBLE         420
  244 # elif (_XOPEN_VERSION - 0 >= 4)
  245 #  define __XPG_VISIBLE         400
  246 # else
  247 #  define __XPG_VISIBLE         300
  248 # endif
  249 #endif
  250 
  251 /*
  252  * POSIX macros, these checks must follow the XOPEN ones above.
  253  *
  254  * _POSIX_SOURCE == 1           1003.1-1988 (superseded by _POSIX_C_SOURCE)
  255  * _POSIX_C_SOURCE == 1         1003.1-1990
  256  * _POSIX_C_SOURCE == 2         1003.2-1992
  257  * _POSIX_C_SOURCE == 199309L   1003.1b-1993
  258  * _POSIX_C_SOURCE == 199506L   1003.1c-1995, 1003.1i-1995,
  259  *                              and the omnibus ISO/IEC 9945-1:1996
  260  * _POSIX_C_SOURCE == 200112L   1003.1-2001
  261  *
  262  * The POSIX spec implies a specific value for __ISO_C_VISIBLE, though
  263  * this may be overridden by the _ISOC99_SOURCE macro later.
  264  */
  265 #ifdef _POSIX_C_SOURCE
  266 # if (_POSIX_C_SOURCE - 0 >= 200112)
  267 #  define __POSIX_VISIBLE       200112
  268 #  define __ISO_C_VISIBLE       1999
  269 # elif (_POSIX_C_SOURCE - 0 >= 199506)
  270 #  define __POSIX_VISIBLE       199506
  271 #  define __ISO_C_VISIBLE       1990
  272 # elif (_POSIX_C_SOURCE - 0 >= 199309)
  273 #  define __POSIX_VISIBLE       199309
  274 #  define __ISO_C_VISIBLE       1990
  275 # elif (_POSIX_C_SOURCE - 0 >= 2)
  276 #  define __POSIX_VISIBLE       199209
  277 #  define __ISO_C_VISIBLE       1990
  278 # else
  279 #  define __POSIX_VISIBLE       199009
  280 #  define __ISO_C_VISIBLE       1990
  281 # endif
  282 #elif defined(_POSIX_SOURCE)
  283 # define __POSIX_VISIBLE        198808
  284 #  define __ISO_C_VISIBLE       0
  285 #endif
  286 
  287 /*
  288  * _ANSI_SOURCE means to expose ANSI C89 interfaces only.
  289  * If the user defines it in addition to one of the POSIX or XOPEN
  290  * macros, assume the POSIX/XOPEN macro(s) should take precedence.
  291  */
  292 #if defined(_ANSI_SOURCE) && !defined(__POSIX_VISIBLE) && \
  293     !defined(__XPG_VISIBLE)
  294 # define __POSIX_VISIBLE        0
  295 # define __XPG_VISIBLE          0
  296 # define __ISO_C_VISIBLE        1990
  297 #endif
  298 
  299 /*
  300  * _ISOC99_SOURCE and __STDC_VERSION__ override any of the other macros since
  301  * they are non-exclusive.
  302  */
  303 #if defined(_ISOC99_SOURCE) || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901)
  304 # undef __ISO_C_VISIBLE
  305 # define __ISO_C_VISIBLE        1999
  306 #endif
  307 
  308 /*
  309  * Finally deal with BSD-specific interfaces that are not covered
  310  * by any standards.  We expose these when one of the POSIX or XPG
  311  * macros is defined or if the user explicitly asks for them.
  312  */
  313 #if !defined(_BSD_SOURCE) && \
  314    (defined(_ANSI_SOURCE) || defined(__XPG_VISIBLE) || defined(__POSIX_VISIBLE))
  315 # define __BSD_VISIBLE          0
  316 #endif
  317 
  318 /*
  319  * Default values.
  320  */
  321 #ifndef __XPG_VISIBLE
  322 # define __XPG_VISIBLE          600
  323 #endif
  324 #ifndef __POSIX_VISIBLE
  325 # define __POSIX_VISIBLE        200112
  326 #endif
  327 #ifndef __ISO_C_VISIBLE
  328 # define __ISO_C_VISIBLE        1999
  329 #endif
  330 #ifndef __BSD_VISIBLE
  331 # define __BSD_VISIBLE          1
  332 #endif
  333 
  334 #endif /* !_SYS_CDEFS_H_ */

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