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feature.h
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feature.h
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/* Copyright (C) 1991,1992,1993,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006
Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
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.
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. */
#ifndef _FEATURES_H
#define _FEATURES_H 1
/* These are defined by the user (or the compiler)
to specify the desired environment:
__STRICT_ANSI__ ISO Standard C.
_ISOC99_SOURCE Extensions to ISO C89 from ISO C99.
_POSIX_SOURCE IEEE Std 1003.1.
_POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
if >=199309L, add IEEE Std 1003.1b-1993;
if >=199506L, add IEEE Std 1003.1c-1995;
if >=200112L, all of IEEE 1003.1-2004
_XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if
Single Unix conformance is wanted, to 600 for the
upcoming sixth revision.
_XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
_LARGEFILE_SOURCE Some more functions for correct standard I/O.
_LARGEFILE64_SOURCE Additional functionality from LFS for large files.
_FILE_OFFSET_BITS=N Select default filesystem interface.
_BSD_SOURCE ISO C, POSIX, and 4.3BSD things.
_SVID_SOURCE ISO C, POSIX, and SVID things.
_ATFILE_SOURCE Additional *at interfaces.
_GNU_SOURCE All of the above, plus GNU extensions.
_REENTRANT Select additionally reentrant object.
_THREAD_SAFE Same as _REENTRANT, often used by other systems.
_FORTIFY_SOURCE If set to numeric value > 0 additional security
measures are defined, according to level.
The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__.
If none of these are defined, the default is to have _SVID_SOURCE,
_BSD_SOURCE, and _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to
200112L. If more than one of these are defined, they accumulate.
For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE
together give you ISO C, 1003.1, and 1003.2, but nothing else.
These are defined by this file and are used by the
header files to decide what to declare or define:
__USE_ISOC99 Define ISO C99 things.
__USE_POSIX Define IEEE Std 1003.1 things.
__USE_POSIX2 Define IEEE Std 1003.2 things.
__USE_POSIX199309 Define IEEE Std 1003.1, and .1b things.
__USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things.
__USE_XOPEN Define XPG things.
__USE_XOPEN_EXTENDED Define X/Open Unix things.
__USE_UNIX98 Define Single Unix V2 things.
__USE_XOPEN2K Define XPG6 things.
__USE_LARGEFILE Define correct standard I/O things.
__USE_LARGEFILE64 Define LFS things with separate names.
__USE_FILE_OFFSET64 Define 64bit interface as default.
__USE_BSD Define 4.3BSD things.
__USE_SVID Define SVID things.
__USE_MISC Define things common to BSD and System V Unix.
__USE_ATFILE Define *at interfaces and AT_* constants for them.
__USE_GNU Define GNU extensions.
__USE_REENTRANT Define reentrant/thread-safe *_r functions.
__USE_FORTIFY_LEVEL Additional security measures used, according to level.
__FAVOR_BSD Favor 4.3BSD things in cases of conflict.
The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
defined by this file unconditionally. `__GNU_LIBRARY__' is provided
only for compatibility. All new code should use the other symbols
to test for features.
All macros listed above as possibly being defined by this file are
explicitly undefined if they are not explicitly defined.
Feature-test macros that are not defined by the user or compiler
but are implied by the other feature-test macros defined (or by the
lack of any definitions) are defined by the file. */
/* Undefine everything, so we get a clean slate. */
#undef __USE_ISOC99
#undef __USE_POSIX
#undef __USE_POSIX2
#undef __USE_POSIX199309
#undef __USE_POSIX199506
#undef __USE_XOPEN
#undef __USE_XOPEN_EXTENDED
#undef __USE_UNIX98
#undef __USE_XOPEN2K
#undef __USE_LARGEFILE
#undef __USE_LARGEFILE64
#undef __USE_FILE_OFFSET64
#undef __USE_BSD
#undef __USE_SVID
#undef __USE_MISC
#undef __USE_ATFILE
#undef __USE_GNU
#undef __USE_REENTRANT
#undef __USE_FORTIFY_LEVEL
#undef __FAVOR_BSD
#undef __KERNEL_STRICT_NAMES
/* Suppress kernel-name space pollution unless user expressedly asks
for it. */
#ifndef _LOOSE_KERNEL_NAMES
# define __KERNEL_STRICT_NAMES
#endif
/* Always use ISO C things. */
#define __USE_ANSI 1
/* Convenience macros to test the versions of glibc and gcc.
Use them like this:
#if __GNUC_PREREQ (2,8)
... code requiring gcc 2.8 or later ...
#endif
Note - they won't work for gcc1 or glibc1, since the _MINOR macros
were not defined then. */
#if defined __GNUC__ && defined __GNUC_MINOR__
# define __GNUC_PREREQ(maj, min) \
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
#else
# define __GNUC_PREREQ(maj, min) 0
#endif
/* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */
#if defined _BSD_SOURCE && \
!(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \
defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \
defined _GNU_SOURCE || defined _SVID_SOURCE)
# define __FAVOR_BSD 1
#endif
/* If _GNU_SOURCE was defined by the user, turn on all the other features. */
#ifdef _GNU_SOURCE
# undef _ISOC99_SOURCE
# define _ISOC99_SOURCE 1
# undef _POSIX_SOURCE
# define _POSIX_SOURCE 1
# undef _POSIX_C_SOURCE
# define _POSIX_C_SOURCE 200112L
# undef _XOPEN_SOURCE
# define _XOPEN_SOURCE 600
# undef _XOPEN_SOURCE_EXTENDED
# define _XOPEN_SOURCE_EXTENDED 1
# undef _LARGEFILE64_SOURCE
# define _LARGEFILE64_SOURCE 1
# undef _BSD_SOURCE
# define _BSD_SOURCE 1
# undef _SVID_SOURCE
# define _SVID_SOURCE 1
# undef _ATFILE_SOURCE
# define _ATFILE_SOURCE 1
#endif
/* If nothing (other than _GNU_SOURCE) is defined,
define _BSD_SOURCE and _SVID_SOURCE. */
#if (!defined __STRICT_ANSI__ && !defined _ISOC99_SOURCE && \
!defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \
!defined _XOPEN_SOURCE && !defined _XOPEN_SOURCE_EXTENDED && \
!defined _BSD_SOURCE && !defined _SVID_SOURCE)
# define _BSD_SOURCE 1
# define _SVID_SOURCE 1
#endif
/* This is to enable the ISO C99 extension. Also recognize the old macro
which was used prior to the standard acceptance. This macro will
eventually go away and the features enabled by default once the ISO C99
standard is widely adopted. */
#if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \
|| (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
# define __USE_ISOC99 1
#endif
/* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2
(and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */
#if ((!defined __STRICT_ANSI__ || (_XOPEN_SOURCE - 0) >= 500) && \
!defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE)
# define _POSIX_SOURCE 1
# if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500
# define _POSIX_C_SOURCE 2
# elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 600
# define _POSIX_C_SOURCE 199506L
# else
# define _POSIX_C_SOURCE 200112L
# endif
#endif
#if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE
# define __USE_POSIX 1
#endif
#if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE
# define __USE_POSIX2 1
#endif
#if (_POSIX_C_SOURCE - 0) >= 199309L
# define __USE_POSIX199309 1
#endif
#if (_POSIX_C_SOURCE - 0) >= 199506L
# define __USE_POSIX199506 1
#endif
#if (_POSIX_C_SOURCE - 0) >= 200112L
# define __USE_XOPEN2K 1
#endif
#ifdef _XOPEN_SOURCE
# define __USE_XOPEN 1
# if (_XOPEN_SOURCE - 0) >= 500
# define __USE_XOPEN_EXTENDED 1
# define __USE_UNIX98 1
# undef _LARGEFILE_SOURCE
# define _LARGEFILE_SOURCE 1
# if (_XOPEN_SOURCE - 0) >= 600
# define __USE_XOPEN2K 1
# undef __USE_ISOC99
# define __USE_ISOC99 1
# endif
# else
# ifdef _XOPEN_SOURCE_EXTENDED
# define __USE_XOPEN_EXTENDED 1
# endif
# endif
#endif
#ifdef _LARGEFILE_SOURCE
# define __USE_LARGEFILE 1
#endif
#ifdef _LARGEFILE64_SOURCE
# define __USE_LARGEFILE64 1
#endif
#if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64
# define __USE_FILE_OFFSET64 1
#endif
#if defined _BSD_SOURCE || defined _SVID_SOURCE
# define __USE_MISC 1
#endif
#ifdef _BSD_SOURCE
# define __USE_BSD 1
#endif
#ifdef _SVID_SOURCE
# define __USE_SVID 1
#endif
#ifdef _ATFILE_SOURCE
# define __USE_ATFILE 1
#endif
#ifdef _GNU_SOURCE
# define __USE_GNU 1
#endif
#if defined _REENTRANT || defined _THREAD_SAFE
# define __USE_REENTRANT 1
#endif
#if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0 \
&& defined __OPTIMIZE__ && __OPTIMIZE__ > 0 \
&& (__GNUC_PREREQ (4, 1) \
|| (defined __GNUC_RH_RELEASE__ && __GNUC_PREREQ (4, 0)) \
|| (defined __GNUC_RH_RELEASE__ && __GNUC_PREREQ (3, 4) \
&& __GNUC_MINOR__ == 4 \
&& (__GNUC_PATCHLEVEL__ > 2 \
|| (__GNUC_PATCHLEVEL__ == 2 && __GNUC_RH_RELEASE__ >= 8))))
# if _FORTIFY_SOURCE > 1
# define __USE_FORTIFY_LEVEL 2
# else
# define __USE_FORTIFY_LEVEL 1
# endif
#else
# define __USE_FORTIFY_LEVEL 0
#endif
/* We do support the IEC 559 math functionality, real and complex. */
#define __STDC_IEC_559__ 1
#define __STDC_IEC_559_COMPLEX__ 1
/* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1. */
#define __STDC_ISO_10646__ 200009L
/* This macro indicates that the installed library is the GNU C Library.
For historic reasons the value now is 6 and this will stay from now
on. The use of this variable is deprecated. Use __GLIBC__ and
__GLIBC_MINOR__ now (see below) when you want to test for a specific
GNU C library version and use the values in <gnu/lib-names.h> to get
the sonames of the shared libraries. */
#undef __GNU_LIBRARY__
#define __GNU_LIBRARY__ 6
/* Major and minor version number of the GNU C library package. Use
these macros to test for features in specific releases. */
#define __GLIBC__ 2
#define __GLIBC_MINOR__ 5
#define __GLIBC_PREREQ(maj, min) \
((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
/* Decide whether a compiler supports the long long datatypes. */
#if defined __GNUC__ \
|| (defined __PGI && defined __i386__ ) \
|| (defined __INTEL_COMPILER && (defined __i386__ || defined __ia64__)) \
|| (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
# define __GLIBC_HAVE_LONG_LONG 1
#endif
/* This is here only because every header file already includes this one. */
#ifndef __ASSEMBLER__
# ifndef _SYS_CDEFS_H
# include <sys/cdefs.h>
# endif
/* If we don't have __REDIRECT, prototypes will be missing if
__USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */
# if defined __USE_FILE_OFFSET64 && !defined __REDIRECT
# define __USE_LARGEFILE 1
# define __USE_LARGEFILE64 1
# endif
#endif /* !ASSEMBLER */
/* Decide whether we can define 'extern inline' functions in headers. */
#if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \
&& !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__
# define __USE_EXTERN_INLINES 1
#endif
/* This is here only because every header file already includes this one.
Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
<gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub
that will always return failure (and set errno to ENOSYS). */
#include <gnu/stubs.h>
#endif /* features.h */
/* O_*, F_*, FD_* bit values for Linux.
Copyright (C) 1995, 1996, 1997, 1998, 2000, 2004, 2006
Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
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.
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. */
#ifndef _FCNTL_H
# error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
#endif
#include <sys/types.h>
#ifdef __USE_GNU
# include <bits/uio.h>
#endif
/* open/fcntl - O_SYNC is only implemented on blocks devices and on files
located on an ext2 file system */
#define O_ACCMODE 0003
#define O_RDONLY 00
#define O_WRONLY 01
#define O_RDWR 02
#define O_CREAT 0100 /* not fcntl */
#define O_EXCL 0200 /* not fcntl */
#define O_NOCTTY 0400 /* not fcntl */
#define O_TRUNC 01000 /* not fcntl */
#define O_APPEND 02000
#define O_NONBLOCK 04000
#define O_NDELAY O_NONBLOCK
#define O_SYNC 010000
#define O_FSYNC O_SYNC
#define O_ASYNC 020000
#ifdef __USE_GNU
# define O_DIRECT 040000 /* Direct disk access. */
# define O_DIRECTORY 0200000 /* Must be a directory. */
# define O_NOFOLLOW 0400000 /* Do not follow links. */
# define O_NOATIME 01000000 /* Do not set atime. */
#endif
/* For now Linux has synchronisity options for data and read operations.
We define the symbols here but let them do the same as O_SYNC since
this is a superset. */
#if defined __USE_POSIX199309 || defined __USE_UNIX98
# define O_DSYNC O_SYNC /* Synchronize data. */
# define O_RSYNC O_SYNC /* Synchronize read operations. */
#endif
#ifdef __USE_LARGEFILE64
# define O_LARGEFILE 0100000
#endif
/* Values for the second argument to `fcntl'. */
#define F_DUPFD 0 /* Duplicate file descriptor. */
#define F_GETFD 1 /* Get file descriptor flags. */
#define F_SETFD 2 /* Set file descriptor flags. */
#define F_GETFL 3 /* Get file status flags. */
#define F_SETFL 4 /* Set file status flags. */
#ifndef __USE_FILE_OFFSET64
# define F_GETLK 5 /* Get record locking info. */
# define F_SETLK 6 /* Set record locking info (non-blocking). */
# define F_SETLKW 7 /* Set record locking info (blocking). */
#else
# define F_GETLK F_GETLK64 /* Get record locking info. */
# define F_SETLK F_SETLK64 /* Set record locking info (non-blocking).*/
# define F_SETLKW F_SETLKW64 /* Set record locking info (blocking). */
#endif
#define F_GETLK64 12 /* Get record locking info. */
#define F_SETLK64 13 /* Set record locking info (non-blocking). */
#define F_SETLKW64 14 /* Set record locking info (blocking). */
#if defined __USE_BSD || defined __USE_UNIX98
# define F_SETOWN 8 /* Get owner of socket (receiver of SIGIO). */
# define F_GETOWN 9 /* Set owner of socket (receiver of SIGIO). */
#endif
#ifdef __USE_GNU
# define F_SETSIG 10 /* Set number of signal to be sent. */
# define F_GETSIG 11 /* Get number of signal to be sent. */
#endif
#ifdef __USE_GNU
# define F_SETLEASE 1024 /* Set a lease. */
# define F_GETLEASE 1025 /* Enquire what lease is active. */
# define F_NOTIFY 1026 /* Request notfications on a directory. */
#endif
/* For F_[GET|SET]FD. */
#define FD_CLOEXEC 1 /* actually anything with low bit set goes */
/* For posix fcntl() and `l_type' field of a `struct flock' for lockf(). */
#define F_RDLCK 0 /* Read lock. */
#define F_WRLCK 1 /* Write lock. */
#define F_UNLCK 2 /* Remove lock. */
/* For old implementation of bsd flock(). */
#define F_EXLCK 4 /* or 3 */
#define F_SHLCK 8 /* or 4 */
#ifdef __USE_BSD
/* Operations for bsd flock(), also used by the kernel implementation. */
# define LOCK_SH 1 /* shared lock */
# define LOCK_EX 2 /* exclusive lock */
# define LOCK_NB 4 /* or'd with one of the above to prevent
blocking */
# define LOCK_UN 8 /* remove lock */
#endif
#ifdef __USE_GNU
# define LOCK_MAND 32 /* This is a mandatory flock: */
# define LOCK_READ 64 /* ... which allows concurrent read operations. */
# define LOCK_WRITE 128 /* ... which allows concurrent write operations. */
# define LOCK_RW 192 /* ... Which allows concurrent read & write operations. */
#endif
#ifdef __USE_GNU
/* Types of directory notifications that may be requested with F_NOTIFY. */
# define DN_ACCESS 0x00000001 /* File accessed. */
# define DN_MODIFY 0x00000002 /* File modified. */
# define DN_CREATE 0x00000004 /* File created. */
# define DN_DELETE 0x00000008 /* File removed. */
# define DN_RENAME 0x00000010 /* File renamed. */
# define DN_ATTRIB 0x00000020 /* File changed attibutes. */
# define DN_MULTISHOT 0x80000000 /* Don't remove notifier. */
#endif
struct flock
{
short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
#ifndef __USE_FILE_OFFSET64
__off_t l_start; /* Offset where the lock begins. */
__off_t l_len; /* Size of the locked area; zero means until EOF. */
#else
__off64_t l_start; /* Offset where the lock begins. */
__off64_t l_len; /* Size of the locked area; zero means until EOF. */
#endif
__pid_t l_pid; /* Process holding the lock. */
};
#ifdef __USE_LARGEFILE64
struct flock64
{
short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
__off64_t l_start; /* Offset where the lock begins. */
__off64_t l_len; /* Size of the locked area; zero means until EOF. */
__pid_t l_pid; /* Process holding the lock. */
};
#endif
/* Define some more compatibility macros to be backward compatible with
BSD systems which did not managed to hide these kernel macros. */
#ifdef __USE_BSD
# define FAPPEND O_APPEND
# define FFSYNC O_FSYNC
# define FASYNC O_ASYNC
# define FNONBLOCK O_NONBLOCK
# define FNDELAY O_NDELAY
#endif /* Use BSD. */
/* Advise to `posix_fadvise'. */
#ifdef __USE_XOPEN2K
# define POSIX_FADV_NORMAL 0 /* No further special treatment. */
# define POSIX_FADV_RANDOM 1 /* Expect random page references. */
# define POSIX_FADV_SEQUENTIAL 2 /* Expect sequential page references. */
# define POSIX_FADV_WILLNEED 3 /* Will need these pages. */
# define POSIX_FADV_DONTNEED 4 /* Don't need these pages. */
# define POSIX_FADV_NOREUSE 5 /* Data will be accessed once. */
#endif
#ifdef __USE_GNU
/* Flags for SYNC_FILE_RANGE. */
# define SYNC_FILE_RANGE_WAIT_BEFORE 1 /* Wait upon writeout of all pages
in the range before performing the
write. */
# define SYNC_FILE_RANGE_WRITE 2 /* Initiate writeout of all those
dirty pages in the range which are
not presently under writeback. */
# define SYNC_FILE_RANGE_WAIT_AFTER 4 /* Wait upon writeout of all pages in
the range after performing the
write. */
/* Flags for SPLICE and VMSPLICE. */
# define SPLICE_F_MOVE 1 /* Move pages instead of copying. */
# define SPLICE_F_NONBLOCK 2 /* Don't block on the pipe splicing
(but we may still block on the fd
we splice from/to). */
# define SPLICE_F_MORE 4 /* Expect more data. */
# define SPLICE_F_GIFT 8 /* Pages passed in are a gift. */
#endif
__BEGIN_DECLS
#ifdef __USE_GNU
/* Provide kernel hint to read ahead. */
extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
__THROW;
/* Selective file content synch'ing. */
extern int sync_file_range (int __fd, __off64_t __from, __off64_t __to,
unsigned int __flags);
/* Splice address range into a pipe. */
extern int vmsplice (int __fdout, const struct iovec *__iov, size_t __count,
unsigned int __flags);
/* Splice two files together. */
extern int splice (int __fdin, __off64_t *__offin, int __fdout,
__off64_t *__offout, size_t __len, unsigned int __flags)
__THROW;
/* In-kernel implementation of tee for pipe buffers. */
extern int tee (int __fdin, int __fdout, size_t __len, unsigned int __flags)
__THROW;
#endif
__END_DECLS