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438 lines
14 KiB
C
438 lines
14 KiB
C
/* O_*, F_*, FD_* bit values for Linux.
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Copyright (C) 2001-2016 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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#ifndef _FCNTL_H
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# error "Never use <bits/fcntl-linux.h> directly; include <fcntl.h> instead."
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#endif
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/* This file contains shared definitions between Linux architectures
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and is included by <bits/fcntl.h> to declare them. The various
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#ifndef cases allow the architecture specific file to define those
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values with different values.
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A minimal <bits/fcntl.h> contains just:
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struct flock {...}
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#ifdef __USE_LARGEFILE64
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struct flock64 {...}
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#endif
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#include <bits/fcntl-linux.h>
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*/
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#ifdef __USE_GNU
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# include <bits/uio.h>
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#endif
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/* open/fcntl. */
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#define O_ACCMODE 0003
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#define O_RDONLY 00
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#define O_WRONLY 01
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#define O_RDWR 02
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#ifndef O_CREAT
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# define O_CREAT 0100 /* Not fcntl. */
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#endif
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#ifndef O_EXCL
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# define O_EXCL 0200 /* Not fcntl. */
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#endif
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#ifndef O_NOCTTY
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# define O_NOCTTY 0400 /* Not fcntl. */
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#endif
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#ifndef O_TRUNC
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# define O_TRUNC 01000 /* Not fcntl. */
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#endif
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#ifndef O_APPEND
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# define O_APPEND 02000
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#endif
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#ifndef O_NONBLOCK
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# define O_NONBLOCK 04000
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#endif
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#ifndef O_NDELAY
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# define O_NDELAY O_NONBLOCK
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#endif
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#ifndef O_SYNC
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# define O_SYNC 04010000
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#endif
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#define O_FSYNC O_SYNC
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#ifndef O_ASYNC
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# define O_ASYNC 020000
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#endif
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#ifndef __O_LARGEFILE
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# define __O_LARGEFILE 0100000
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#endif
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#ifndef __O_DIRECTORY
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# define __O_DIRECTORY 0200000
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#endif
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#ifndef __O_NOFOLLOW
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# define __O_NOFOLLOW 0400000
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#endif
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#ifndef __O_CLOEXEC
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# define __O_CLOEXEC 02000000
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#endif
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#ifndef __O_DIRECT
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# define __O_DIRECT 040000
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#endif
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#ifndef __O_NOATIME
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# define __O_NOATIME 01000000
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#endif
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#ifndef __O_PATH
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# define __O_PATH 010000000
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#endif
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#ifndef __O_DSYNC
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# define __O_DSYNC 010000
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#endif
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#ifndef __O_TMPFILE
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# define __O_TMPFILE (020000000 | __O_DIRECTORY)
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#endif
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#ifndef F_GETLK
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# ifndef __USE_FILE_OFFSET64
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# define F_GETLK 5 /* Get record locking info. */
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# define F_SETLK 6 /* Set record locking info (non-blocking). */
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# define F_SETLKW 7 /* Set record locking info (blocking). */
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# else
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# define F_GETLK F_GETLK64 /* Get record locking info. */
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# define F_SETLK F_SETLK64 /* Set record locking info (non-blocking).*/
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# define F_SETLKW F_SETLKW64 /* Set record locking info (blocking). */
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# endif
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#endif
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#ifndef F_GETLK64
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# define F_GETLK64 12 /* Get record locking info. */
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# define F_SETLK64 13 /* Set record locking info (non-blocking). */
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# define F_SETLKW64 14 /* Set record locking info (blocking). */
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#endif
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/* open file description locks.
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Usually record locks held by a process are released on *any* close and are
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not inherited across a fork.
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These cmd values will set locks that conflict with process-associated record
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locks, but are "owned" by the opened file description, not the process.
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This means that they are inherited across fork or clone with CLONE_FILES
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like BSD (flock) locks, and they are only released automatically when the
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last reference to the the file description against which they were acquired
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is put. */
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#ifdef __USE_GNU
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# define F_OFD_GETLK 36
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# define F_OFD_SETLK 37
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# define F_OFD_SETLKW 38
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#endif
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#ifdef __USE_LARGEFILE64
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# define O_LARGEFILE __O_LARGEFILE
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#endif
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#ifdef __USE_XOPEN2K8
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# define O_DIRECTORY __O_DIRECTORY /* Must be a directory. */
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# define O_NOFOLLOW __O_NOFOLLOW /* Do not follow links. */
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# define O_CLOEXEC __O_CLOEXEC /* Set close_on_exec. */
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#endif
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#ifdef __USE_GNU
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# define O_DIRECT __O_DIRECT /* Direct disk access. */
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# define O_NOATIME __O_NOATIME /* Do not set atime. */
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# define O_PATH __O_PATH /* Resolve pathname but do not open file. */
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# define O_TMPFILE __O_TMPFILE /* Atomically create nameless file. */
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#endif
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/* For now, Linux has no separate synchronicitiy options for read
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operations. We define O_RSYNC therefore as the same as O_SYNC
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since this is a superset. */
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#if defined __USE_POSIX199309 || defined __USE_UNIX98
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# define O_DSYNC __O_DSYNC /* Synchronize data. */
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# if defined __O_RSYNC
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# define O_RSYNC __O_RSYNC /* Synchronize read operations. */
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# else
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# define O_RSYNC O_SYNC /* Synchronize read operations. */
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# endif
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#endif
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/* Values for the second argument to `fcntl'. */
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#define F_DUPFD 0 /* Duplicate file descriptor. */
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#define F_GETFD 1 /* Get file descriptor flags. */
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#define F_SETFD 2 /* Set file descriptor flags. */
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#define F_GETFL 3 /* Get file status flags. */
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#define F_SETFL 4 /* Set file status flags. */
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#ifndef __F_SETOWN
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# define __F_SETOWN 8
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# define __F_GETOWN 9
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#endif
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#if defined __USE_UNIX98 || defined __USE_XOPEN2K8
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# define F_SETOWN __F_SETOWN /* Get owner (process receiving SIGIO). */
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# define F_GETOWN __F_GETOWN /* Set owner (process receiving SIGIO). */
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#endif
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#ifndef __F_SETSIG
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# define __F_SETSIG 10 /* Set number of signal to be sent. */
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# define __F_GETSIG 11 /* Get number of signal to be sent. */
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#endif
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#ifndef __F_SETOWN_EX
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# define __F_SETOWN_EX 15 /* Get owner (thread receiving SIGIO). */
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# define __F_GETOWN_EX 16 /* Set owner (thread receiving SIGIO). */
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#endif
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#ifdef __USE_GNU
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# define F_SETSIG __F_SETSIG /* Set number of signal to be sent. */
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# define F_GETSIG __F_GETSIG /* Get number of signal to be sent. */
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# define F_SETOWN_EX __F_SETOWN_EX /* Get owner (thread receiving SIGIO). */
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# define F_GETOWN_EX __F_GETOWN_EX /* Set owner (thread receiving SIGIO). */
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#endif
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#ifdef __USE_GNU
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# define F_SETLEASE 1024 /* Set a lease. */
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# define F_GETLEASE 1025 /* Enquire what lease is active. */
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# define F_NOTIFY 1026 /* Request notifications on a directory. */
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# define F_SETPIPE_SZ 1031 /* Set pipe page size array. */
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# define F_GETPIPE_SZ 1032 /* Set pipe page size array. */
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#endif
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#ifdef __USE_XOPEN2K8
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# define F_DUPFD_CLOEXEC 1030 /* Duplicate file descriptor with
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close-on-exit set. */
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#endif
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/* For F_[GET|SET]FD. */
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#define FD_CLOEXEC 1 /* Actually anything with low bit set goes */
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#ifndef F_RDLCK
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/* For posix fcntl() and `l_type' field of a `struct flock' for lockf(). */
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# define F_RDLCK 0 /* Read lock. */
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# define F_WRLCK 1 /* Write lock. */
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# define F_UNLCK 2 /* Remove lock. */
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#endif
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/* For old implementation of BSD flock. */
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#ifndef F_EXLCK
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# define F_EXLCK 4 /* or 3 */
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# define F_SHLCK 8 /* or 4 */
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#endif
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#ifdef __USE_MISC
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/* Operations for BSD flock, also used by the kernel implementation. */
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# define LOCK_SH 1 /* Shared lock. */
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# define LOCK_EX 2 /* Exclusive lock. */
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# define LOCK_NB 4 /* Or'd with one of the above to prevent
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blocking. */
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# define LOCK_UN 8 /* Remove lock. */
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#endif
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#ifdef __USE_GNU
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# define LOCK_MAND 32 /* This is a mandatory flock: */
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# define LOCK_READ 64 /* ... which allows concurrent read operations. */
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# define LOCK_WRITE 128 /* ... which allows concurrent write operations. */
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# define LOCK_RW 192 /* ... Which allows concurrent read & write operations. */
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#endif
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#ifdef __USE_GNU
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/* Types of directory notifications that may be requested with F_NOTIFY. */
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# define DN_ACCESS 0x00000001 /* File accessed. */
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# define DN_MODIFY 0x00000002 /* File modified. */
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# define DN_CREATE 0x00000004 /* File created. */
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# define DN_DELETE 0x00000008 /* File removed. */
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# define DN_RENAME 0x00000010 /* File renamed. */
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# define DN_ATTRIB 0x00000020 /* File changed attributes. */
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# define DN_MULTISHOT 0x80000000 /* Don't remove notifier. */
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#endif
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#ifdef __USE_GNU
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/* Owner types. */
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enum __pid_type
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{
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F_OWNER_TID = 0, /* Kernel thread. */
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F_OWNER_PID, /* Process. */
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F_OWNER_PGRP, /* Process group. */
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F_OWNER_GID = F_OWNER_PGRP /* Alternative, obsolete name. */
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};
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/* Structure to use with F_GETOWN_EX and F_SETOWN_EX. */
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struct f_owner_ex
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{
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enum __pid_type type; /* Owner type of ID. */
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__pid_t pid; /* ID of owner. */
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};
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#endif
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/* Define some more compatibility macros to be backward compatible with
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BSD systems which did not managed to hide these kernel macros. */
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#ifdef __USE_MISC
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# define FAPPEND O_APPEND
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# define FFSYNC O_FSYNC
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# define FASYNC O_ASYNC
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# define FNONBLOCK O_NONBLOCK
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# define FNDELAY O_NDELAY
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#endif /* Use misc. */
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#ifndef __POSIX_FADV_DONTNEED
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# define __POSIX_FADV_DONTNEED 4
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# define __POSIX_FADV_NOREUSE 5
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#endif
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/* Advise to `posix_fadvise'. */
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#ifdef __USE_XOPEN2K
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# define POSIX_FADV_NORMAL 0 /* No further special treatment. */
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# define POSIX_FADV_RANDOM 1 /* Expect random page references. */
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# define POSIX_FADV_SEQUENTIAL 2 /* Expect sequential page references. */
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# define POSIX_FADV_WILLNEED 3 /* Will need these pages. */
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# define POSIX_FADV_DONTNEED __POSIX_FADV_DONTNEED /* Don't need these pages. */
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# define POSIX_FADV_NOREUSE __POSIX_FADV_NOREUSE /* Data will be accessed once. */
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#endif
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#ifdef __USE_GNU
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/* Flags for SYNC_FILE_RANGE. */
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# define SYNC_FILE_RANGE_WAIT_BEFORE 1 /* Wait upon writeout of all pages
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in the range before performing the
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write. */
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# define SYNC_FILE_RANGE_WRITE 2 /* Initiate writeout of all those
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dirty pages in the range which are
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not presently under writeback. */
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# define SYNC_FILE_RANGE_WAIT_AFTER 4 /* Wait upon writeout of all pages in
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the range after performing the
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write. */
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/* Flags for SPLICE and VMSPLICE. */
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# define SPLICE_F_MOVE 1 /* Move pages instead of copying. */
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# define SPLICE_F_NONBLOCK 2 /* Don't block on the pipe splicing
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(but we may still block on the fd
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we splice from/to). */
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# define SPLICE_F_MORE 4 /* Expect more data. */
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# define SPLICE_F_GIFT 8 /* Pages passed in are a gift. */
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/* Flags for fallocate. */
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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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# define FALLOC_FL_COLLAPSE_RANGE 8 /* Remove a range of a file
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without leaving a
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hole. */
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# define FALLOC_FL_ZERO_RANGE 16 /* Convert a range of a
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file to zeros. */
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/* File handle structure. */
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struct file_handle
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{
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unsigned int handle_bytes;
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int handle_type;
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/* File identifier. */
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unsigned char f_handle[0];
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};
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/* Maximum handle size (for now). */
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# define MAX_HANDLE_SZ 128
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#endif
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/* Values for `*at' functions. */
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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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__BEGIN_DECLS
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#ifdef __USE_GNU
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/* Provide kernel hint to read ahead. */
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extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
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__THROW;
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/* Selective file content synch'ing.
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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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extern int sync_file_range (int __fd, __off64_t __offset, __off64_t __count,
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unsigned int __flags);
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/* Splice address range into a pipe.
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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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extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
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size_t __count, unsigned int __flags);
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/* Splice two files together.
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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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extern ssize_t splice (int __fdin, __off64_t *__offin, int __fdout,
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__off64_t *__offout, size_t __len,
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unsigned int __flags);
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/* In-kernel implementation of tee for pipe buffers.
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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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extern ssize_t tee (int __fdin, int __fdout, size_t __len,
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unsigned int __flags);
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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 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,
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__off64_t __len);
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# endif
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/* Map file name to file handle. */
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extern int name_to_handle_at (int __dfd, const char *__name,
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struct file_handle *__handle, int *__mnt_id,
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int __flags) __THROW;
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/* Open file using the file handle.
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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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extern int open_by_handle_at (int __mountdirfd, struct file_handle *__handle,
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int __flags);
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#endif /* use GNU */
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__END_DECLS
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