2002-08-17 Jeff Johnston <jjohnstn@redhat.com>
* Makefile.am: Move cmath stuff into libc/sys/linux.
* Makefile.in: Regenerated.
* configure.host: Default -DMB_CAPABLE for x86-linux.
* libc/include/reent.h: Define _sbrk to take signed int argument.
* libc/include/sys/unistd.h: Ditto for _sbrk_r and sbrk.
* libc/locale/locale.c[MB_CAPABLE]: Add LC_MESSAGES support and
make locale name checking more efficient. Also allow "C-ISO-8859-1"
locale for LC_CTYPE and LC_MESSAGES.
* libc/reent/sbrkr.c: Change prototype to take ptrdiff_t.
* libc/sys/linux/brk.c: Change sbrk prototype.
* libc/sys/linux/include/time.h: Remove Cygwin stuff and
include <sys/features.h>.
(CLOCK_THREAD_CPUTIME): Renamed to CLOCK_THREAD_CPUTIME_ID.
(CLOCK_PROCESS_CPUTIME): Renamed to CLOCK_PROCESS_CPUTIME_ID.
* libc/sys/linux/sys/cdefs.h: Replace with glibc sys/cdefs.h
with a few local additions.
* libc/sys/linux/sys/features.h: New file.
* libc/sys/linux/sys/unistd.h: Change _sbrk_r and sbrk prototypes
to take signed argument.
* libc/syscalls/syssbrk.c: Change sbrk, _sbrk_r, and _sbrk
prototypes to take signed size argument.
This commit is contained in:
Jeff Johnston
@ -28,7 +28,7 @@ int brk(void *end_data_segment)
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}
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void *sbrk(size_t increment) /* SHOULD be ptrdiff_t */
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void *sbrk(ptrdiff_t increment) /* SHOULD be ptrdiff_t */
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{
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char *old_brk,*new_brk;
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@ -104,22 +104,9 @@ extern __IMPORT char *_tzname[2];
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#define tzname _tzname
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#endif
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/* CYGWIN also exposes daylight and timezone in the name space */
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#ifdef __CYGWIN__
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#ifndef daylight
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#define daylight _daylight
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#endif
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#if timezonevar
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#ifndef timezone
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#define timezone ((long int) _timezone)
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#endif
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#else
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char *_EXFUN(timezone, (void));
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#endif
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#endif /* __CYGWIN__ */
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#endif /* !__STRICT_ANSI__ */
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#include <bits/posix_opt.h>
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#include <sys/features.h>
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#if defined(_POSIX_TIMERS)
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@ -187,7 +174,7 @@ int _EXFUN(nanosleep, (const struct timespec *rqtp, struct timespec *rmtp));
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the identifier of the CPU_time clock associated with the PROCESS
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making the function call. */
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#define CLOCK_PROCESS_CPUTIME (clockid_t)2
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#define CLOCK_PROCESS_CPUTIME_ID (clockid_t)2
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#endif
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@ -197,7 +184,7 @@ int _EXFUN(nanosleep, (const struct timespec *rqtp, struct timespec *rmtp));
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the identifier of the CPU_time clock associated with the THREAD
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making the function call. */
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#define CLOCK_THREAD_CPUTIME (clockid_t)3
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#define CLOCK_THREAD_CPUTIME_ID (clockid_t)3
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#endif
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@ -1,125 +1,230 @@
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/* libc/sys/linux/sys/cdefs.h - Helper macros for K&R vs. ANSI C compat. */
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/* Copyright (C) 1992,93,94,95,96,97,98,99,2000,2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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/* Written 2000 by Werner Almesberger */
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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||||
License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Berkeley Software Design, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
|
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* 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.
|
||||
*
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||||
* 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.
|
||||
*
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||||
* @(#)cdefs.h 8.8 (Berkeley) 1/9/95
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* $FreeBSD: src/sys/sys/cdefs.h,v 1.54 2002/05/11 03:58:24 alfred Exp $
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||||
*/
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
#ifndef _SYS_CDEFS_H
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||||
#define _SYS_CDEFS_H
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, write to the Free
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
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#ifndef _SYS_CDEFS_H
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#define _SYS_CDEFS_H 1
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||||
/* We are almost always included from features.h. */
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#ifndef _FEATURES_H
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# include <features.h>
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#endif
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||||
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/* The GNU libc does not support any K&R compilers or the traditional mode
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||||
of ISO C compilers anymore. Check for some of the combinations not
|
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anymore supported. */
|
||||
#if defined __GNUC__ && !defined __STDC__
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||||
# error "You need a ISO C conforming compiler to use the glibc headers"
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||||
#endif
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||||
|
||||
#define __FBSDID(x) /* nothing */
|
||||
/*
|
||||
* Note: the goal here is not compatibility to K&R C. Since we know that we
|
||||
* have GCC which understands ANSI C perfectly well, we make use of this.
|
||||
*/
|
||||
|
||||
#define __P(args) args
|
||||
#define __PMT(args) args
|
||||
#define __const const
|
||||
#define __signed signed
|
||||
#define __volatile volatile
|
||||
#define __DOTS , ...
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||||
#define __THROW
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||||
/* Some user header file might have defined this before. */
|
||||
#undef __P
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||||
#undef __PMT
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||||
|
||||
#ifdef __GNUC__
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||||
|
||||
/* GCC can always grok prototypes. For C++ programs we add throw()
|
||||
to help it optimize the function calls. But this works only with
|
||||
gcc 2.8.x and egcs. */
|
||||
# if defined __cplusplus && __GNUC_PREREQ (2,8)
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||||
# define __THROW throw ()
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||||
# else
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||||
# define __THROW
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||||
# endif
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||||
# define __P(args) args __THROW
|
||||
/* This macro will be used for functions which might take C++ callback
|
||||
functions. */
|
||||
# define __PMT(args) args
|
||||
|
||||
#else /* Not GCC. */
|
||||
|
||||
# define __inline /* No inline functions. */
|
||||
|
||||
# define __THROW
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||||
# define __P(args) args
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||||
# define __PMT(args) args
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||||
|
||||
# define __const const
|
||||
# define __signed signed
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||||
# define __volatile volatile
|
||||
|
||||
#endif /* GCC. */
|
||||
|
||||
/* For these things, GCC behaves the ANSI way normally,
|
||||
and the non-ANSI way under -traditional. */
|
||||
|
||||
#define __CONCAT(x,y) x ## y
|
||||
#define __STRING(x) #x
|
||||
|
||||
/* This is not a typedef so `const __ptr_t' does the right thing. */
|
||||
#define __ptr_t void *
|
||||
#define __long_double_t long double
|
||||
|
||||
#define __attribute_malloc__
|
||||
#define __attribute_pure__
|
||||
#define __attribute_format_strfmon__(a,b)
|
||||
#define __flexarr [0]
|
||||
#define __restrict_arr
|
||||
|
||||
#ifdef __cplusplus
|
||||
# define __BEGIN_DECLS extern "C" {
|
||||
# define __END_DECLS }
|
||||
/* C++ needs to know that types and declarations are C, not C++. */
|
||||
#ifdef __cplusplus
|
||||
# define __BEGIN_DECLS extern "C" {
|
||||
# define __END_DECLS }
|
||||
#else
|
||||
# define __BEGIN_DECLS
|
||||
# define __END_DECLS
|
||||
#endif
|
||||
|
||||
|
||||
/* Support for bounded pointers. */
|
||||
#ifndef __BOUNDED_POINTERS__
|
||||
# define __bounded /* nothing */
|
||||
# define __unbounded /* nothing */
|
||||
# define __ptrvalue /* nothing */
|
||||
# define __bounded /* nothing */
|
||||
# define __unbounded /* nothing */
|
||||
# define __ptrvalue /* nothing */
|
||||
#endif
|
||||
|
||||
|
||||
#ifdef __GNUC__
|
||||
#define __strong_reference(sym,aliassym) \
|
||||
extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)));
|
||||
#ifdef __ELF__
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||||
#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")
|
||||
/* Support for flexible arrays. */
|
||||
#if __GNUC_PREREQ (2,97)
|
||||
/* GCC 2.97 supports C99 flexible array members. */
|
||||
# define __flexarr []
|
||||
#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__ */
|
||||
#else /* !__ELF__ */
|
||||
#ifdef __STDC__
|
||||
#define __weak_reference(sym,alias) \
|
||||
__asm__(".stabs \"_" #alias "\",11,0,0,0"); \
|
||||
__asm__(".stabs \"_" #sym "\",1,0,0,0")
|
||||
#define __warn_references(sym,msg) \
|
||||
__asm__(".stabs \"" msg "\",30,0,0,0"); \
|
||||
__asm__(".stabs \"_" #sym "\",1,0,0,0")
|
||||
#else
|
||||
#define __weak_reference(sym,alias) \
|
||||
__asm__(".stabs \"_/**/alias\",11,0,0,0"); \
|
||||
__asm__(".stabs \"_/**/sym\",1,0,0,0")
|
||||
#define __warn_references(sym,msg) \
|
||||
__asm__(".stabs msg,30,0,0,0"); \
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||||
__asm__(".stabs \"_/**/sym\",1,0,0,0")
|
||||
#endif /* __STDC__ */
|
||||
#endif /* __ELF__ */
|
||||
#endif /* __GNUC__ */
|
||||
# ifdef __GNUC__
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||||
# define __flexarr [0]
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||||
# else
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||||
# if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
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||||
# define __flexarr []
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||||
# else
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||||
/* Some other non-C99 compiler. Approximate with [1]. */
|
||||
# define __flexarr [1]
|
||||
# endif
|
||||
# endif
|
||||
#endif
|
||||
|
||||
#endif /* _SYS_CDEFS_H */
|
||||
|
||||
/* __asm__ ("xyz") is used throughout the headers to rename functions
|
||||
at the assembly language level. This is wrapped by the __REDIRECT
|
||||
macro, in order to support compilers that can do this some other
|
||||
way. When compilers don't support asm-names at all, we have to do
|
||||
preprocessor tricks instead (which don't have exactly the right
|
||||
semantics, but it's the best we can do).
|
||||
|
||||
Example:
|
||||
int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */
|
||||
|
||||
#if defined __GNUC__ && __GNUC__ >= 2
|
||||
|
||||
# define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias))
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||||
# define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
|
||||
# define __ASMNAME2(prefix, cname) __STRING (prefix) cname
|
||||
|
||||
/*
|
||||
#elif __SOME_OTHER_COMPILER__
|
||||
|
||||
# define __REDIRECT(name, proto, alias) name proto; \
|
||||
_Pragma("let " #name " = " #alias)
|
||||
*/
|
||||
#endif
|
||||
|
||||
/* GCC has various useful declarations that can be made with the
|
||||
`__attribute__' syntax. All of the ways we use this do fine if
|
||||
they are omitted for compilers that don't understand it. */
|
||||
#if !defined __GNUC__ || __GNUC__ < 2
|
||||
# define __attribute__(xyz) /* Ignore */
|
||||
#endif
|
||||
|
||||
/* At some point during the gcc 2.96 development the `malloc' attribute
|
||||
for functions was introduced. We don't want to use it unconditionally
|
||||
(although this would be possible) since it generates warnings. */
|
||||
#if __GNUC_PREREQ (2,96)
|
||||
# define __attribute_malloc__ __attribute__ ((__malloc__))
|
||||
#else
|
||||
# define __attribute_malloc__ /* Ignore */
|
||||
#endif
|
||||
|
||||
/* At some point during the gcc 2.96 development the `pure' attribute
|
||||
for functions was introduced. We don't want to use it unconditionally
|
||||
(although this would be possible) since it generates warnings. */
|
||||
#if __GNUC_PREREQ (2,96)
|
||||
# define __attribute_pure__ __attribute__ ((__pure__))
|
||||
#else
|
||||
# define __attribute_pure__ /* Ignore */
|
||||
#endif
|
||||
|
||||
/* At some point during the gcc 3.1 development the `used' attribute
|
||||
for functions was introduced. We don't want to use it unconditionally
|
||||
(although this would be possible) since it generates warnings. */
|
||||
#if __GNUC_PREREQ (3,1)
|
||||
# define __attribute_used__ __attribute__ ((__used__))
|
||||
# define __attribute_noinline__ __attribute__ ((__noinline__))
|
||||
#else
|
||||
# define __attribute_used__ __attribute__ ((__unused__))
|
||||
# define __attribute_noinline__ /* Ignore */
|
||||
#endif
|
||||
|
||||
/* At some point during the gcc 2.8 development the `format_arg' attribute
|
||||
for functions was introduced. We don't want to use it unconditionally
|
||||
(although this would be possible) since it generates warnings.
|
||||
If several `format_arg' attributes are given for the same function, in
|
||||
gcc-3.0 and older, all but the last one are ignored. In newer gccs,
|
||||
all designated arguments are considered. */
|
||||
#if __GNUC_PREREQ (2,8)
|
||||
# define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
|
||||
#else
|
||||
# define __attribute_format_arg__(x) /* Ignore */
|
||||
#endif
|
||||
|
||||
/* At some point during the gcc 2.97 development the `strfmon' format
|
||||
attribute for functions was introduced. We don't want to use it
|
||||
unconditionally (although this would be possible) since it
|
||||
generates warnings. */
|
||||
#if __GNUC_PREREQ (2,97)
|
||||
# define __attribute_format_strfmon__(a,b) \
|
||||
__attribute__ ((__format__ (__strfmon__, a, b)))
|
||||
#else
|
||||
# define __attribute_format_strfmon__(a,b) /* Ignore */
|
||||
#endif
|
||||
|
||||
/* It is possible to compile containing GCC extensions even if GCC is
|
||||
run in pedantic mode if the uses are carefully marked using the
|
||||
`__extension__' keyword. But this is not generally available before
|
||||
version 2.8. */
|
||||
#if !__GNUC_PREREQ (2,8)
|
||||
# define __extension__ /* Ignore */
|
||||
#endif
|
||||
|
||||
/* __restrict is known in EGCS 1.2 and above. */
|
||||
#if !__GNUC_PREREQ (2,92)
|
||||
# define __restrict /* Ignore */
|
||||
#endif
|
||||
|
||||
/* ISO C99 also allows to declare arrays as non-overlapping. The syntax is
|
||||
array_name[restrict]
|
||||
GCC 3.1 supports this. */
|
||||
#if __GNUC_PREREQ (3,1) && !defined __GNUG__
|
||||
# define __restrict_arr __restrict
|
||||
#else
|
||||
# ifdef __GNUC__
|
||||
# define __restrict_arr /* Not supported in old GCC. */
|
||||
# else
|
||||
# if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
|
||||
# define __restrict_arr restrict
|
||||
# else
|
||||
/* Some other non-C99 compiler. */
|
||||
# define __restrict_arr /* Not supported. */
|
||||
# endif
|
||||
# endif
|
||||
#endif
|
||||
|
||||
#endif /* sys/cdefs.h */
|
||||
|
||||
16
newlib/libc/sys/linux/sys/features.h
Normal file
16
newlib/libc/sys/linux/sys/features.h
Normal file
@ -0,0 +1,16 @@
|
||||
#ifndef _SYS_FEATURES_H
|
||||
#define _SYS_FEATURES_H
|
||||
|
||||
#include <bits/posix_opt.h>
|
||||
|
||||
/* We do not support asynchronous I/O. */
|
||||
#undef _POSIX_ASYNCHRONOUS_IO
|
||||
#undef _POSIX_ASYNC_IO
|
||||
#undef _LFS_ASYNCHRONOUS_IO
|
||||
#undef _LFS64_ASYNCHRONOUS_IO
|
||||
|
||||
/* POSIX message queues are supported. */
|
||||
#undef _POSIX_MESSAGE_PASSING
|
||||
#define _POSIX_MESSAGE_PASSING 1
|
||||
|
||||
#endif /* _SYS_FEATURES_H */
|
||||
@ -23,9 +23,7 @@ unsigned _EXFUN(alarm, (unsigned __secs ));
|
||||
int _EXFUN(chdir, (const char *__path ));
|
||||
int _EXFUN(chmod, (const char *__path, mode_t __mode ));
|
||||
int _EXFUN(chown, (const char *__path, uid_t __owner, gid_t __group ));
|
||||
#if defined(__CYGWIN__) || defined(__rtems__)
|
||||
int _EXFUN(chroot, (const char *__path ));
|
||||
#endif
|
||||
int _EXFUN(close, (int __fildes ));
|
||||
char _EXFUN(*ctermid, (char *__s ));
|
||||
char _EXFUN(*cuserid, (char *__s ));
|
||||
@ -40,18 +38,14 @@ int _EXFUN(execlp, (const char *__file, const char *, ... ));
|
||||
int _EXFUN(execv, (const char *__path, char * const __argv[] ));
|
||||
int _EXFUN(execve, (const char *__path, char * const __argv[], char * const __envp[] ));
|
||||
int _EXFUN(execvp, (const char *__file, char * const __argv[] ));
|
||||
#if defined(__CYGWIN__) || defined(__rtems__)
|
||||
int _EXFUN(fchdir, (int __fildes));
|
||||
#endif
|
||||
int _EXFUN(fchmod, (int __fildes, mode_t __mode ));
|
||||
int _EXFUN(fchown, (int __fildes, uid_t __owner, gid_t __group ));
|
||||
pid_t _EXFUN(fork, (void ));
|
||||
long _EXFUN(fpathconf, (int __fd, int __name ));
|
||||
int _EXFUN(fsync, (int __fd));
|
||||
char _EXFUN(*getcwd, (char *__buf, size_t __size ));
|
||||
#if defined(__CYGWIN__)
|
||||
int _EXFUN(getdomainname ,(char *__name, size_t __len));
|
||||
#endif
|
||||
gid_t _EXFUN(getegid, (void ));
|
||||
uid_t _EXFUN(geteuid, (void ));
|
||||
gid_t _EXFUN(getgid, (void ));
|
||||
@ -67,11 +61,8 @@ pid_t _EXFUN(getpgrp, (void ));
|
||||
pid_t _EXFUN(getpid, (void ));
|
||||
pid_t _EXFUN(getppid, (void ));
|
||||
uid_t _EXFUN(getuid, (void ));
|
||||
#ifdef __CYGWIN__
|
||||
char * _EXFUN(getusershell, (void));
|
||||
char _EXFUN(*getwd, (char *__buf ));
|
||||
int _EXFUN(iruserok, (unsigned long raddr, int superuser, const char *ruser, const char *luser));
|
||||
#endif
|
||||
int _EXFUN(isatty, (int __fildes ));
|
||||
int _EXFUN(lchown, (const char *__path, uid_t __owner, gid_t __group ));
|
||||
int _EXFUN(link, (const char *__path1, const char *__path2 ));
|
||||
@ -86,30 +77,15 @@ int _EXFUN(pipe, (int __fildes[2] ));
|
||||
ssize_t _EXFUN(pread, (int __fd, void *__buf, size_t __nbytes, off_t __offset));
|
||||
ssize_t _EXFUN(pwrite, (int __fd, const void *__buf, size_t __nbytes, off_t __offset));
|
||||
_READ_WRITE_RETURN_TYPE _EXFUN(read, (int __fd, void *__buf, size_t __nbyte ));
|
||||
#if defined(__CYGWIN__)
|
||||
int _EXFUN(revoke, (char *path));
|
||||
#endif
|
||||
int _EXFUN(rmdir, (const char *__path ));
|
||||
#if defined(__CYGWIN__)
|
||||
int _EXFUN(ruserok, (const char *rhost, int superuser, const char *ruser, const char *luser));
|
||||
#endif
|
||||
#if defined(__rtems__)
|
||||
void * _EXFUN(sbrk, (ptrdiff_t __incr));
|
||||
#else
|
||||
void * _EXFUN(sbrk, (size_t __incr));
|
||||
#endif
|
||||
#if defined(__CYGWIN__)
|
||||
int _EXFUN(setegid, (gid_t __gid ));
|
||||
int _EXFUN(seteuid, (uid_t __uid ));
|
||||
#endif
|
||||
int _EXFUN(setgid, (gid_t __gid ));
|
||||
int _EXFUN(setpgid, (pid_t __pid, pid_t __pgid ));
|
||||
int _EXFUN(setpgrp, (void ));
|
||||
pid_t _EXFUN(setsid, (void ));
|
||||
int _EXFUN(setuid, (uid_t __uid ));
|
||||
#if defined(__CYGWIN__)
|
||||
void _EXFUN(setusershell, (void));
|
||||
#endif
|
||||
unsigned _EXFUN(sleep, (unsigned int __seconds ));
|
||||
void _EXFUN(swab, (const void *, void *, ssize_t));
|
||||
long _EXFUN(sysconf, (int __name ));
|
||||
|
||||
Reference in New Issue
Block a user