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/* Copyright (C) 1991,1992,1994-2001,2003,2004,2005,2006,2007, 2009
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, see
<http://www.gnu.org/licenses/>. */
/*
* POSIX Standard: 6.5 File Control Operations <fcntl.h>
*/
#ifndef _FCNTL_H
#define _FCNTL_H 1
#include <features.h>
/* This must be early so <bits/fcntl.h> can define types winningly. */
__BEGIN_DECLS
/* Get the definitions of O_*, F_*, FD_*: all the
numbers and flag bits for `open', `fcntl', et al. */
#include <bits/fcntl.h>
/* For XPG all symbols from <sys/stat.h> should also be available. */
#ifdef __USE_XOPEN
# include <sys/stat.h>
#endif
#ifdef __USE_MISC
# ifndef R_OK /* Verbatim from <unistd.h>. Ugh. */
/* Values for the second argument to access.
These may be OR'd together. */
# define R_OK 4 /* Test for read permission. */
# define W_OK 2 /* Test for write permission. */
# define X_OK 1 /* Test for execute permission. */
# define F_OK 0 /* Test for existence. */
# endif
#endif /* Use misc. */
/* XPG wants the following symbols. */
#ifdef __USE_XOPEN /* <stdio.h> has the same definitions. */
# define SEEK_SET 0 /* Seek from beginning of file. */
# define SEEK_CUR 1 /* Seek from current position. */
# define SEEK_END 2 /* Seek from end of file. */
#endif /* XPG */
#ifdef __USE_ATFILE
# define AT_FDCWD -100 /* Special value used to indicate
the *at functions should use the
current working directory. */
# define AT_SYMLINK_NOFOLLOW 0x100 /* Do not follow symbolic links. */
# define AT_REMOVEDIR 0x200 /* Remove directory instead of
unlinking file. */
# define AT_SYMLINK_FOLLOW 0x400 /* Follow symbolic links. */
# ifdef __USE_GNU
# define AT_NO_AUTOMOUNT 0x800 /* Suppress terminal automount
traversal. */
# define AT_EMPTY_PATH 0x1000 /* Allow empty relative pathname. */
# endif
# define AT_EACCESS 0x200 /* Test access permitted for
effective IDs, not real IDs. */
#endif
/* Do the file control operation described by CMD on FD.
The remaining arguments are interpreted depending on CMD.
This function is a cancellation point and therefore not marked with
__THROW. */
#if !defined(__USE_FILE_OFFSET64) || defined(__LP64__)
extern int fcntl (int __fd, int __cmd, ...);
# ifdef _LIBC
extern int __fcntl_nocancel(int, int, long) attribute_hidden;
libc_hidden_proto(fcntl)
# endif
#else
# ifdef __REDIRECT
extern int __REDIRECT (fcntl, (int __fd, int __cmd, ...), fcntl64);
# else
# define fcntl fcntl64
# endif
#endif
#if defined(__USE_LARGEFILE64) && !defined(__LP64__)
extern int fcntl64 (int __fd, int __cmd, ...);
# ifdef _LIBC
extern int __fcntl64_nocancel(int, int, long) attribute_hidden;
libc_hidden_proto(fcntl64)
# endif
#endif
/* Open FILE and return a new file descriptor for it, or -1 on error.
OFLAG determines the type of access used. If O_CREAT is on OFLAG,
the third argument is taken as a `mode_t', the mode of the created file.
This function is a cancellation point and therefore not marked with
__THROW. */
#ifndef __USE_FILE_OFFSET64
extern int open (const char *__file, int __oflag, ...) __nonnull ((1));
libc_hidden_proto(open)
# ifdef _LIBC
extern int __open2_nocancel(const char *, int) __nonnull ((1)) attribute_hidden;
extern int __open_nocancel(const char *, int, mode_t) __nonnull ((1)) attribute_hidden;
# endif
#else
# ifdef __REDIRECT
extern int __REDIRECT (open, (const char *__file, int __oflag, ...), open64)
__nonnull ((1));
# else
# define open open64
# endif
#endif
#ifdef __USE_LARGEFILE64
extern int open64 (const char *__file, int __oflag, ...) __nonnull ((1));
libc_hidden_proto(open64)
#endif
#ifdef __USE_ATFILE
/* Similar to `open' but a relative path name is interpreted relative to
the directory for which FD is a descriptor.
NOTE: some other `openat' implementation support additional functionality
through this interface, especially using the O_XATTR flag. This is not
yet supported here.
This function is a cancellation point and therefore not marked with
__THROW. */
# ifndef __USE_FILE_OFFSET64
extern int openat (int __fd, const char *__file, int __oflag, ...)
__nonnull ((2));
libc_hidden_proto(openat)
# else
# ifdef __REDIRECT
extern int __REDIRECT (openat, (int __fd, const char *__file, int __oflag,
...), openat64) __nonnull ((2));
# else
# define openat openat64
# endif
# endif
extern int openat64 (int __fd, const char *__file, int __oflag, ...)
__nonnull ((2));
#endif
/* Create and open FILE, with mode MODE. This takes an `int' MODE
argument because that is what `mode_t' will be widened to.
This function is a cancellation point and therefore not marked with
__THROW. */
#ifndef __USE_FILE_OFFSET64
extern int creat (const char *__file, __mode_t __mode) __nonnull ((1));
#else
# ifdef __REDIRECT
extern int __REDIRECT (creat, (const char *__file, __mode_t __mode),
creat64) __nonnull ((1));
# else
# define creat creat64
# endif
#endif
#ifdef __USE_LARGEFILE64
extern int creat64 (const char *__file, __mode_t __mode) __nonnull ((1));
#endif
#if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
&& !defined __USE_POSIX))
/* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
files consistent. Some systems have them there and some here, and some
software depends on the macros being defined without including both. */
/* `lockf' is a simpler interface to the locking facilities of `fcntl'.
LEN is always relative to the current file position.
The CMD argument is one of the following. */
# define F_ULOCK 0 /* Unlock a previously locked region. */
# define F_LOCK 1 /* Lock a region for exclusive use. */
# define F_TLOCK 2 /* Test and lock a region for exclusive use. */
# define F_TEST 3 /* Test a region for other processes locks. */
# ifndef __USE_FILE_OFFSET64
extern int lockf (int __fd, int __cmd, __off_t __len);
libc_hidden_proto(lockf)
# else
# ifdef __REDIRECT
extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), lockf64);
# else
# define lockf lockf64
# endif
# endif
# ifdef __USE_LARGEFILE64
extern int lockf64 (int __fd, int __cmd, __off64_t __len);
# endif
#endif
#if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
/* Advice the system about the expected behaviour of the application with
respect to the file associated with FD. */
# ifndef __USE_FILE_OFFSET64
extern int posix_fadvise (int __fd, __off_t __offset, __off_t __len,
int __advise) __THROW;
# else
# ifdef __REDIRECT_NTH
extern int __REDIRECT_NTH (posix_fadvise, (int __fd, __off64_t __offset,
__off64_t __len, int __advise),
posix_fadvise64);
# else
# define posix_fadvise posix_fadvise64
# endif
# endif
# ifdef __USE_LARGEFILE64
extern int posix_fadvise64 (int __fd, __off64_t __offset, __off64_t __len,
int __advise) __THROW;
# endif
#endif
#if defined __UCLIBC_HAS_ADVANCED_REALTIME__
/* Reserve storage for the data of the file associated with FD.
This function is a possible cancellation point and therefore not
marked with __THROW. */
# ifndef __USE_FILE_OFFSET64
extern int posix_fallocate (int __fd, __off_t __offset, __off_t __len);
# else
# ifdef __REDIRECT
extern int __REDIRECT (posix_fallocate, (int __fd, __off64_t __offset,
__off64_t __len),
posix_fallocate64);
# else
# define posix_fallocate posix_fallocate64
# endif
# endif
# ifdef __USE_LARGEFILE64
extern int posix_fallocate64 (int __fd, __off64_t __offset, __off64_t __len);
# endif
#endif
#if (defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU) || defined _LIBC
/* Reserve storage for the data of a file associated with FD. This function
is Linux-specific. For the portable version, use posix_fallocate().
Unlike the latter, fallocate can operate in different modes. The default
mode = 0 is equivalent to posix_fallocate().
Note: These declarations are used in posix_fallocate.c and
posix_fallocate64.c, so we expose them internally.
*/
/* Flags for fallocate's mode. */
# define FALLOC_FL_KEEP_SIZE 1 /* Don't extend size of file
even if offset + len is
greater than file size. */
# define FALLOC_FL_PUNCH_HOLE 2 /* Create a hole in the file. */
# ifndef __USE_FILE_OFFSET64
extern int fallocate (int __fd, int __mode, __off_t __offset, __off_t __len);
# else
# ifdef __REDIRECT
extern int __REDIRECT (fallocate, (int __fd, int __mode, __off64_t __offset,
__off64_t __len),
fallocate64);
# else
# define fallocate fallocate64
# endif
# endif
# ifdef __USE_LARGEFILE64
extern int fallocate64 (int __fd, int __mode, __off64_t __offset, __off64_t __len);
# endif
#endif
__END_DECLS
#endif /* fcntl.h */
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