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