FreeBSD/Linux Kernel Cross Reference
sys/sys/cdefs.h

     /*
      * Copyright (c) 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * Berkeley Software Design, Inc.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)cdefs.h     8.8 (Berkeley) 1/9/95
     * $FreeBSD: releng/5.2/sys/sys/cdefs.h 121783 2003-10-31 05:42:53Z peter $
     */
    
    #ifndef _SYS_CDEFS_H_
    #define _SYS_CDEFS_H_
    
    #if defined(__cplusplus)
    #define __BEGIN_DECLS   extern "C" {
    #define __END_DECLS     }
    #else
    #define __BEGIN_DECLS
    #define __END_DECLS
    #endif
    
    /*
     * Macro to test if we're using a specific version of gcc or later.
     */
    #ifdef __GNUC__
    #define __GNUC_PREREQ__(ma, mi) \
            (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
    #else
    #define __GNUC_PREREQ__(ma, mi) 0
    #endif
    
    /*
     * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
     * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
     * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
     * mode -- there must be no spaces between its arguments, and for nested
     * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
     * concatenate double-quoted strings produced by the __STRING macro, but
     * this only works with ANSI C.
     *
     * __XSTRING is like __STRING, but it expands any macros in its argument
     * first.  It is only available with ANSI C.
     */
    #if defined(__STDC__) || defined(__cplusplus)
    #define __P(protos)     protos          /* full-blown ANSI C */
    #define __CONCAT1(x,y)  x ## y
    #define __CONCAT(x,y)   __CONCAT1(x,y)
    #define __STRING(x)     #x              /* stringify without expanding x */
    #define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */
    
    #define __const         const           /* define reserved names to standard */
    #define __signed        signed
    #define __volatile      volatile
    #if defined(__cplusplus)
    #define __inline        inline          /* convert to C++ keyword */
    #else
    #ifndef __GNUC__
    #define __inline                        /* delete GCC keyword */
    #endif /* !__GNUC__ */
    #endif /* !__cplusplus */
    
    #else   /* !(__STDC__ || __cplusplus) */
    #define __P(protos)     ()              /* traditional C preprocessor */
    #define __CONCAT(x,y)   x/**/y
    #define __STRING(x)     "x"
    
    #ifndef __GNUC__
    #define __const                         /* delete pseudo-ANSI C keywords */
    #define __inline
    #define __signed
   #define __volatile
   /*
    * In non-ANSI C environments, new programs will want ANSI-only C keywords
    * deleted from the program and old programs will want them left alone.
    * When using a compiler other than gcc, programs using the ANSI C keywords
    * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
    * When using "gcc -traditional", we assume that this is the intent; if
    * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
    */
   #ifndef NO_ANSI_KEYWORDS
   #define const                           /* delete ANSI C keywords */
   #define inline
   #define signed
   #define volatile
   #endif  /* !NO_ANSI_KEYWORDS */
   #endif  /* !__GNUC__ */
   #endif  /* !(__STDC__ || __cplusplus) */
   
   /*
    * Compiler-dependent macros to help declare dead (non-returning) and
    * pure (no side effects) functions, and unused variables.  They are
    * null except for versions of gcc that are known to support the features
    * properly (old versions of gcc-2 supported the dead and pure features
    * in a different (wrong) way).  If we do not provide an implementation
    * for a given compiler, let the compile fail if it is told to use
    * a feature that we cannot live without.
    */
   #ifdef lint
   #define __dead2
   #define __pure2
   #define __unused
   #define __packed
   #define __aligned(x)
   #define __section(x)
   #else
   #if !__GNUC_PREREQ__(2, 5)
   #define __dead2
   #define __pure2
   #define __unused
   #endif
   #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7
   #define __dead2         __attribute__((__noreturn__))
   #define __pure2         __attribute__((__const__))
   #define __unused
   /* XXX Find out what to do for __packed, __aligned and __section */
   #endif
   #if __GNUC_PREREQ__(2, 7)
   #define __dead2         __attribute__((__noreturn__))
   #define __pure2         __attribute__((__const__))
   #define __unused        __attribute__((__unused__))
   #define __packed        __attribute__((__packed__))
   #define __aligned(x)    __attribute__((__aligned__(x)))
   #define __section(x)    __attribute__((__section__(x)))
   #endif
   #endif
   
   #if __GNUC_PREREQ__(3, 1)
   #define __always_inline __attribute__((__always_inline__))
   #else
   #define __always_inline
   #endif
   
   #if __GNUC_PREREQ__(3, 3)
   #define __nonnull(x)    __attribute__((__nonnull__(x)))
   #else
   #define __nonnull(x)
   #endif
   
   /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
   #if !__GNUC_PREREQ__(2, 7)
   #define __func__        NULL
   #endif
   
   #if __GNUC__ >= 2 && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
   #define __LONG_LONG_SUPPORTED
   #endif
   
   /*
    * GCC 2.95 provides `__restrict' as an extension to C90 to support the
    * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
    * a way to define the `restrict' type qualifier without disturbing older
    * software that is unaware of C99 keywords.
    */
   #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
   #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901
   #define __restrict
   #else
   #define __restrict      restrict
   #endif
   #endif
   
   /*
    * GNU C version 2.96 adds explicit branch prediction so that
    * the CPU back-end can hint the processor and also so that
    * code blocks can be reordered such that the predicted path
    * sees a more linear flow, thus improving cache behavior, etc.
    *
    * The following two macros provide us with a way to utilize this
    * compiler feature.  Use __predict_true() if you expect the expression
    * to evaluate to true, and __predict_false() if you expect the
    * expression to evaluate to false.
    *
    * A few notes about usage:
    *
    *      * Generally, __predict_false() error condition checks (unless
    *        you have some _strong_ reason to do otherwise, in which case
    *        document it), and/or __predict_true() `no-error' condition
    *        checks, assuming you want to optimize for the no-error case.
    *
    *      * Other than that, if you don't know the likelihood of a test
    *        succeeding from empirical or other `hard' evidence, don't
    *        make predictions.
    *
    *      * These are meant to be used in places that are run `a lot'.
    *        It is wasteful to make predictions in code that is run
    *        seldomly (e.g. at subsystem initialization time) as the
    *        basic block reordering that this affects can often generate
    *        larger code.
    */
   #if __GNUC_PREREQ__(2, 96)
   #define __predict_true(exp)     __builtin_expect((exp), 1)
   #define __predict_false(exp)    __builtin_expect((exp), 0)
   #else
   #define __predict_true(exp)     (exp)
   #define __predict_false(exp)    (exp)
   #endif
   
   /*
    * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
    * require it.
    */
   #define __offsetof(type, field) ((size_t)(&((type *)0)->field))
   
   /*
    * Compiler-dependent macros to declare that functions take printf-like
    * or scanf-like arguments.  They are null except for versions of gcc
    * that are known to support the features properly (old versions of gcc-2
    * didn't permit keeping the keywords out of the application namespace).
    */
   #if !__GNUC_PREREQ__(2, 7)
   #define __printflike(fmtarg, firstvararg)
   #define __scanflike(fmtarg, firstvararg)
   #else
   #define __printflike(fmtarg, firstvararg) \
               __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
   #define __scanflike(fmtarg, firstvararg) \
               __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
   #endif
   
   /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
   #if __FreeBSD_cc_version >= 300001
   #define __printf0like(fmtarg, firstvararg) \
               __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
   #else
   #define __printf0like(fmtarg, firstvararg)
   #endif
   
   #ifdef __GNUC__
   #define __strong_reference(sym,aliassym)        \
           extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)));
   #ifdef __STDC__
   #define __weak_reference(sym,alias)     \
           __asm__(".weak " #alias);       \
           __asm__(".equ "  #alias ", " #sym)
   #define __warn_references(sym,msg)      \
           __asm__(".section .gnu.warning." #sym); \
           __asm__(".asciz \"" msg "\"");  \
           __asm__(".previous")
   #else
   #define __weak_reference(sym,alias)     \
           __asm__(".weak alias");         \
           __asm__(".equ alias, sym")
   #define __warn_references(sym,msg)      \
           __asm__(".section .gnu.warning.sym"); \
           __asm__(".asciz \"msg\"");      \
           __asm__(".previous")
   #endif  /* __STDC__ */
   #endif  /* __GNUC__ */
   
   #ifdef __GNUC__
   #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
   #else
   /*
    * The following definition might not work well if used in header files,
    * but it should be better than nothing.  If you want a "do nothing"
    * version, then it should generate some harmless declaration, such as:
    *    #define __IDSTRING(name,string)   struct __hack
    */
   #define __IDSTRING(name,string) static const char name[] __unused = string
   #endif
   
   /*
    * Embed the rcs id of a source file in the resulting library.  Note that in
    * more recent ELF binutils, we use .ident allowing the ID to be stripped.
    * Usage:
    *      __FBSDID("$FreeBSD: releng/5.2/sys/sys/cdefs.h 121783 2003-10-31 05:42:53Z peter $");
    */
   #ifndef __FBSDID
   #if !defined(lint) && !defined(STRIP_FBSDID)
   #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
   #else
   #define __FBSDID(s)     struct __hack
   #endif
   #endif
   
   #ifndef __RCSID
   #ifndef NO__RCSID
   #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
   #else
   #define __RCSID(s)      struct __hack
   #endif
   #endif
   
   #ifndef __RCSID_SOURCE
   #ifndef NO__RCSID_SOURCE
   #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
   #else
   #define __RCSID_SOURCE(s)       struct __hack
   #endif
   #endif
   
   #ifndef __SCCSID
   #ifndef NO__SCCSID
   #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
   #else
   #define __SCCSID(s)     struct __hack
   #endif
   #endif
   
   #ifndef __COPYRIGHT
   #ifndef NO__COPYRIGHT
   #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
   #else
   #define __COPYRIGHT(s)  struct __hack
   #endif
   #endif
   
   #ifndef __DECONST
   #define __DECONST(type, var)    ((type)(uintptr_t)(const void *)(var))
   #endif
   
   #ifndef __DEVOLATILE
   #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
   #endif
   
   #ifndef __DEQUALIFY
   #define __DEQUALIFY(type, var)  ((type)(uintptr_t)(const volatile void *)(var))
   #endif
   
   /*-
    * The following definitions are an extension of the behavior originally
    * implemented in <sys/_posix.h>, but with a different level of granularity.
    * POSIX.1 requires that the macros we test be defined before any standard
    * header file is included.
    *
    * Here's a quick run-down of the versions:
    *  defined(_POSIX_SOURCE)              1003.1-1988
    *  _POSIX_C_SOURCE == 1                1003.1-1990
    *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
    *  _POSIX_C_SOURCE == 199309           1003.1b-1993
    *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
    *                                      and the omnibus ISO/IEC 9945-1: 1996
    *  _POSIX_C_SOURCE == 200112           1003.1-2001
    *
    * In addition, the X/Open Portability Guide, which is now the Single UNIX
    * Specification, defines a feature-test macro which indicates the version of
    * that specification, and which subsumes _POSIX_C_SOURCE.
    *
    * Our macros begin with two underscores to avoid namespace screwage.
    */
   
   /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
   #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
   #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
   #define _POSIX_C_SOURCE         199009
   #endif
   
   /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
   #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
   #undef _POSIX_C_SOURCE
   #define _POSIX_C_SOURCE         199209
   #endif
   
   /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
   #ifdef _XOPEN_SOURCE
   #if _XOPEN_SOURCE - 0 >= 600
   #define __XSI_VISIBLE           600
   #undef _POSIX_C_SOURCE
   #define _POSIX_C_SOURCE         200112
   #elif _XOPEN_SOURCE - 0 >= 500
   #define __XSI_VISIBLE           500
   #undef _POSIX_C_SOURCE
   #define _POSIX_C_SOURCE         199506
   #endif
   #endif
   
   /*
    * Deal with all versions of POSIX.  The ordering relative to the tests above is
    * important.
    */
   #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
   #define _POSIX_C_SOURCE         198808
   #endif
   #ifdef _POSIX_C_SOURCE
   #if _POSIX_C_SOURCE >= 200112
   #define __POSIX_VISIBLE         200112
   #define __ISO_C_VISIBLE         1999
   #elif _POSIX_C_SOURCE >= 199506
   #define __POSIX_VISIBLE         199506
   #define __ISO_C_VISIBLE         1990
   #elif _POSIX_C_SOURCE >= 199309
   #define __POSIX_VISIBLE         199309
   #define __ISO_C_VISIBLE         1990
   #elif _POSIX_C_SOURCE >= 199209
   #define __POSIX_VISIBLE         199209
   #define __ISO_C_VISIBLE         1990
   #elif _POSIX_C_SOURCE >= 199009
   #define __POSIX_VISIBLE         199009
   #define __ISO_C_VISIBLE         1990
   #else
   #define __POSIX_VISIBLE         198808
   #define __ISO_C_VISIBLE         0
   #endif /* _POSIX_C_SOURCE */
   #else
   /*-
    * Deal with _ANSI_SOURCE:
    * If it is defined, and no other compilation environment is explicitly
    * requested, then define our internal feature-test macros to zero.  This
    * makes no difference to the preprocessor (undefined symbols in preprocessing
    * expressions are defined to have value zero), but makes it more convenient for
    * a test program to print out the values.
    *
    * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
    * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
    * environment (and in fact we will never get here).
    */
   #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
   #define __POSIX_VISIBLE         0
   #define __XSI_VISIBLE           0
   #define __BSD_VISIBLE           0
   #define __ISO_C_VISIBLE         1990
   #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
   #define __POSIX_VISIBLE         0
   #define __XSI_VISIBLE           0
   #define __BSD_VISIBLE           0
   #define __ISO_C_VISIBLE         1999
   #else                           /* Default environment: show everything. */
   #define __POSIX_VISIBLE         200112
   #define __XSI_VISIBLE           600
   #define __BSD_VISIBLE           1
   #define __ISO_C_VISIBLE         1999
   #endif
   #endif
   
   #endif /* !_SYS_CDEFS_H_ */

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