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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. */
- # define AT_STATX_SYNC_TYPE 0x6000
- # define AT_STATX_SYNC_AS_STAT 0x0000
- # define AT_STATX_FORCE_SYNC 0x2000
- # define AT_STATX_DONT_SYNC 0x4000
- # define AT_RECURSIVE 0x8000 /* Apply to the entire subtree. */
- # 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
- #if (defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU)
- struct file_handle {
- unsigned handle_bytes;
- int handle_type;
- unsigned char f_handle[];
- };
- #define MAX_HANDLE_SZ 128
- int name_to_handle_at(int dirfd, const char *pathname,
- struct file_handle *handle, int *mount_id, int flags);
- int open_by_handle_at(int mount_fd, struct file_handle *handle, int flags);
- #endif
- __END_DECLS
- #endif /* fcntl.h */
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