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/* $OpenBSD: cdefs.h,v 1.43 2018/10/29 17:10:40 guenther Exp $ */
/* $NetBSD: cdefs.h,v 1.16 1996/04/03 20:46:39 christos Exp $ */
/*
* 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. 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 8.7 (Berkeley) 1/21/94
*/
#ifndef _SYS_CDEFS_H_
#define _SYS_CDEFS_H_
#include <machine/cdefs.h>
/*
* 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 -- make sure you don't put spaces
* in between its arguments. Do not use __CONCAT on double-quoted strings,
* such as those from the __STRING macro: to concatenate strings just put
* them next to each other.
*/
#if defined(__STDC__) || defined(__cplusplus)
#define __P(protos) protos /* full-blown ANSI C */
#define __CONCAT(x,y) x ## y
#define __STRING(x) #x
#define __const const /* define reserved names to standard */
#define __signed signed
#define __volatile volatile
#if defined(__cplusplus) || defined(__PCC__)
#define __inline inline /* convert to C++ keyword */
#else
#if !defined(__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"
#if !defined(__GNUC__)
#define __const /* delete pseudo-ANSI C keywords */
#define __inline
#define __signed
#define __volatile
#endif /* !__GNUC__ */
#endif /* !(__STDC__ || __cplusplus) */
/*
* GCC1 and some versions of GCC2 declare dead (non-returning) and
* pure (no side effects) functions using "volatile" and "const";
* unfortunately, these then cause warnings under "-ansi -pedantic".
* GCC >= 2.5 uses the __attribute__((attrs)) style. All of these
* work for GNU C++ (modulo a slight glitch in the C++ grammar in
* the distribution version of 2.5.5).
*/
#if !__GNUC_PREREQ__(2, 5) && !defined(__PCC__)
#define __attribute__(x) /* delete __attribute__ if non-gcc or gcc1 */
#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
#define __dead __volatile
#define __pure __const
#endif
#else
#define __dead __attribute__((__noreturn__))
#define __pure __attribute__((__const__))
#endif
#if __GNUC_PREREQ__(2, 7)
#define __unused __attribute__((__unused__))
#else
#define __unused /* delete */
#endif
#if __GNUC_PREREQ__(3, 1)
#define __used __attribute__((__used__))
#else
#define __used __unused /* suppress -Wunused warnings */
#endif
#if __GNUC_PREREQ__(3,4)
# define __warn_unused_result __attribute__((__warn_unused_result__))
#else
# define __warn_unused_result /* delete */
#endif
#if __GNUC_PREREQ__(3,3) && !defined(__clang__)
# define __bounded(args) __attribute__ ((__bounded__ args ))
#else
# define __bounded(args) /* delete */
#endif
/*
* __returns_twice makes the compiler not assume the function
* only returns once. This affects registerisation of variables:
* even local variables need to be in memory across such a call.
* Example: setjmp()
*/
#if __GNUC_PREREQ__(4, 1)
#define __returns_twice __attribute__((returns_twice))
#else
#define __returns_twice
#endif
/*
* __only_inline makes the compiler only use this function definition
* for inlining; references that can't be inlined will be left as
* external references instead of generating a local copy. The
* matching library should include a simple extern definition for
* the function to handle those references. c.f. ctype.h
*/
#ifdef __GNUC__
# if __GNUC_PREREQ__(4, 2)
#define __only_inline extern __inline __attribute__((__gnu_inline__))
# else
#define __only_inline extern __inline
# endif
#else
#define __only_inline static __inline
#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) != 0), 1)
#define __predict_false(exp) __builtin_expect(((exp) != 0), 0)
#else
#define __predict_true(exp) ((exp) != 0)
#define __predict_false(exp) ((exp) != 0)
#endif
/* Delete pseudo-keywords wherever they are not available or needed. */
#ifndef __dead
#define __dead
#define __pure
#endif
/*
* The __packed macro indicates that a variable or structure members
* should have the smallest possible alignment, despite any host CPU
* alignment requirements.
*
* The __aligned(x) macro specifies the minimum alignment of a
* variable or structure.
*
* These macros together are useful for describing the layout and
* alignment of messages exchanged with hardware or other systems.
*/
#if __GNUC_PREREQ__(2, 7) || defined(__PCC__)
#define __packed __attribute__((__packed__))
#define __aligned(x) __attribute__((__aligned__(x)))
#endif
#if !__GNUC_PREREQ__(2, 8)
#define __extension__
#endif
#if __GNUC_PREREQ__(3, 0)
#define __malloc __attribute__((__malloc__))
#else
#define __malloc
#endif
#if defined(__cplusplus)
#define __BEGIN_EXTERN_C extern "C" {
#define __END_EXTERN_C }
#else
#define __BEGIN_EXTERN_C
#define __END_EXTERN_C
#endif
#if __GNUC_PREREQ__(4, 0)
#define __dso_public __attribute__((__visibility__("default")))
#define __dso_hidden __attribute__((__visibility__("hidden")))
#define __BEGIN_PUBLIC_DECLS \
_Pragma("GCC visibility push(default)") __BEGIN_EXTERN_C
#define __END_PUBLIC_DECLS __END_EXTERN_C _Pragma("GCC visibility pop")
#define __BEGIN_HIDDEN_DECLS \
_Pragma("GCC visibility push(hidden)") __BEGIN_EXTERN_C
#define __END_HIDDEN_DECLS __END_EXTERN_C _Pragma("GCC visibility pop")
#else
#define __dso_public
#define __dso_hidden
#define __BEGIN_PUBLIC_DECLS __BEGIN_EXTERN_C
#define __END_PUBLIC_DECLS __END_EXTERN_C
#define __BEGIN_HIDDEN_DECLS __BEGIN_EXTERN_C
#define __END_HIDDEN_DECLS __END_EXTERN_C
#endif
#define __BEGIN_DECLS __BEGIN_EXTERN_C
#define __END_DECLS __END_EXTERN_C
/*
* "The nice thing about standards is that there are so many to choose from."
* There are a number of "feature test macros" specified by (different)
* standards that determine which interfaces and types the header files
* should expose.
*
* Because of inconsistencies in these macros, we define our own
* set in the private name space that end in _VISIBLE. These are
* always defined and so headers can test their values easily.
* Things can get tricky when multiple feature macros are defined.
* We try to take the union of all the features requested.
*
* The following macros are guaranteed to have a value after cdefs.h
* has been included:
* __POSIX_VISIBLE
* __XPG_VISIBLE
* __ISO_C_VISIBLE
* __BSD_VISIBLE
*/
/*
* X/Open Portability Guides and Single Unix Specifications.
* _XOPEN_SOURCE XPG3
* _XOPEN_SOURCE && _XOPEN_VERSION = 4 XPG4
* _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED = 1 XPG4v2
* _XOPEN_SOURCE == 500 XPG5
* _XOPEN_SOURCE == 520 XPG5v2
* _XOPEN_SOURCE == 600 POSIX 1003.1-2001 with XSI
* _XOPEN_SOURCE == 700 POSIX 1003.1-2008 with XSI
*
* The XPG spec implies a specific value for _POSIX_C_SOURCE.
*/
#ifdef _XOPEN_SOURCE
# if (_XOPEN_SOURCE - 0 >= 700)
# define __XPG_VISIBLE 700
# undef _POSIX_C_SOURCE
# define _POSIX_C_SOURCE 200809L
# elif (_XOPEN_SOURCE - 0 >= 600)
# define __XPG_VISIBLE 600
# undef _POSIX_C_SOURCE
# define _POSIX_C_SOURCE 200112L
# elif (_XOPEN_SOURCE - 0 >= 520)
# define __XPG_VISIBLE 520
# undef _POSIX_C_SOURCE
# define _POSIX_C_SOURCE 199506L
# elif (_XOPEN_SOURCE - 0 >= 500)
# define __XPG_VISIBLE 500
# undef _POSIX_C_SOURCE
# define _POSIX_C_SOURCE 199506L
# elif (_XOPEN_SOURCE_EXTENDED - 0 == 1)
# define __XPG_VISIBLE 420
# elif (_XOPEN_VERSION - 0 >= 4)
# define __XPG_VISIBLE 400
# else
# define __XPG_VISIBLE 300
# endif
#endif
/*
* POSIX macros, these checks must follow the XOPEN ones above.
*
* _POSIX_SOURCE == 1 1003.1-1988 (superseded by _POSIX_C_SOURCE)
* _POSIX_C_SOURCE == 1 1003.1-1990
* _POSIX_C_SOURCE == 2 1003.2-1992
* _POSIX_C_SOURCE == 199309L 1003.1b-1993
* _POSIX_C_SOURCE == 199506L 1003.1c-1995, 1003.1i-1995,
* and the omnibus ISO/IEC 9945-1:1996
* _POSIX_C_SOURCE == 200112L 1003.1-2001
* _POSIX_C_SOURCE == 200809L 1003.1-2008
*
* The POSIX spec implies a specific value for __ISO_C_VISIBLE, though
* this may be overridden by the _ISOC99_SOURCE macro later.
*/
#ifdef _POSIX_C_SOURCE
# if (_POSIX_C_SOURCE - 0 >= 200809)
# define __POSIX_VISIBLE 200809
# define __ISO_C_VISIBLE 1999
# elif (_POSIX_C_SOURCE - 0 >= 200112)
# define __POSIX_VISIBLE 200112
# define __ISO_C_VISIBLE 1999
# elif (_POSIX_C_SOURCE - 0 >= 199506)
# define __POSIX_VISIBLE 199506
# define __ISO_C_VISIBLE 1990
# elif (_POSIX_C_SOURCE - 0 >= 199309)
# define __POSIX_VISIBLE 199309
# define __ISO_C_VISIBLE 1990
# elif (_POSIX_C_SOURCE - 0 >= 2)
# define __POSIX_VISIBLE 199209
# define __ISO_C_VISIBLE 1990
# else
# define __POSIX_VISIBLE 199009
# define __ISO_C_VISIBLE 1990
# endif
#elif defined(_POSIX_SOURCE)
# define __POSIX_VISIBLE 198808
# define __ISO_C_VISIBLE 0
#endif
/*
* _ANSI_SOURCE means to expose ANSI C89 interfaces only.
* If the user defines it in addition to one of the POSIX or XOPEN
* macros, assume the POSIX/XOPEN macro(s) should take precedence.
*/
#if defined(_ANSI_SOURCE) && !defined(__POSIX_VISIBLE) && \
!defined(__XPG_VISIBLE)
# define __POSIX_VISIBLE 0
# define __XPG_VISIBLE 0
# define __ISO_C_VISIBLE 1990
#endif
/*
* _ISOC99_SOURCE, _ISOC11_SOURCE, __STDC_VERSION__, and __cplusplus
* override any of the other macros since they are non-exclusive.
*/
#if defined(_ISOC11_SOURCE) || \
(defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112) || \
(defined(__cplusplus) && __cplusplus >= 201703)
# undef __ISO_C_VISIBLE
# define __ISO_C_VISIBLE 2011
#elif defined(_ISOC99_SOURCE) || \
(defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901) || \
(defined(__cplusplus) && __cplusplus >= 201103)
# undef __ISO_C_VISIBLE
# define __ISO_C_VISIBLE 1999
#endif
/*
* Finally deal with BSD-specific interfaces that are not covered
* by any standards. We expose these when none of the POSIX or XPG
* macros is defined or if the user explicitly asks for them.
*/
#if !defined(_BSD_SOURCE) && \
(defined(_ANSI_SOURCE) || defined(__XPG_VISIBLE) || defined(__POSIX_VISIBLE))
# define __BSD_VISIBLE 0
#endif
/*
* Default values.
*/
#ifndef __XPG_VISIBLE
# define __XPG_VISIBLE 700
#endif
#ifndef __POSIX_VISIBLE
# define __POSIX_VISIBLE 200809
#endif
#ifndef __ISO_C_VISIBLE
# define __ISO_C_VISIBLE 2011
#endif
#ifndef __BSD_VISIBLE
# define __BSD_VISIBLE 1
#endif
#endif /* !_SYS_CDEFS_H_ */
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