fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
327 lines
9.0 KiB
Groff
327 lines
9.0 KiB
Groff
.\" Copyright (c) 1989, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)chflags.2 8.3 (Berkeley) 5/2/95
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd March 22, 2013
|
|
.Dt CHFLAGS 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm chflags ,
|
|
.Nm lchflags ,
|
|
.Nm fchflags ,
|
|
.Nm chflagsat
|
|
.Nd set file flags
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In sys/stat.h
|
|
.In unistd.h
|
|
.Ft int
|
|
.Fn chflags "const char *path" "unsigned long flags"
|
|
.Ft int
|
|
.Fn lchflags "const char *path" "unsigned long flags"
|
|
.Ft int
|
|
.Fn fchflags "int fd" "unsigned long flags"
|
|
.Ft int
|
|
.Fn chflagsat "int fd" "const char *path" "unsigned long flags" "int atflag"
|
|
.Sh DESCRIPTION
|
|
The file whose name
|
|
is given by
|
|
.Fa path
|
|
or referenced by the descriptor
|
|
.Fa fd
|
|
has its flags changed to
|
|
.Fa flags .
|
|
.Pp
|
|
The
|
|
.Fn lchflags
|
|
system call is like
|
|
.Fn chflags
|
|
except in the case where the named file is a symbolic link,
|
|
in which case
|
|
.Fn lchflags
|
|
will change the flags of the link itself,
|
|
rather than the file it points to.
|
|
.Pp
|
|
The
|
|
.Fn chflagsat
|
|
is equivalent to either
|
|
.Fn chflags
|
|
or
|
|
.Fn lchflags
|
|
depending on the
|
|
.Fa atflag
|
|
except in the case where
|
|
.Fa path
|
|
specifies a relative path.
|
|
In this case the file to be changed is determined relative to the directory
|
|
associated with the file descriptor
|
|
.Fa fd
|
|
instead of the current working directory.
|
|
The values for the
|
|
.Fa atflag
|
|
are constructed by a bitwise-inclusive OR of flags from the following list,
|
|
defined in
|
|
.In fcntl.h :
|
|
.Bl -tag -width indent
|
|
.It Dv AT_SYMLINK_NOFOLLOW
|
|
If
|
|
.Fa path
|
|
names a symbolic link, then the flags of the symbolic link are changed.
|
|
.El
|
|
.Pp
|
|
If
|
|
.Fn chflagsat
|
|
is passed the special value
|
|
.Dv AT_FDCWD
|
|
in the
|
|
.Fa fd
|
|
parameter, the current working directory is used.
|
|
If also
|
|
.Fa atflag
|
|
is zero, the behavior is identical to a call to
|
|
.Fn chflags .
|
|
.Pp
|
|
The flags specified are formed by
|
|
.Em or Ns 'ing
|
|
the following values
|
|
.Pp
|
|
.Bl -tag -width ".Dv SF_IMMUTABLE" -compact -offset indent
|
|
.It Dv SF_APPEND
|
|
The file may only be appended to.
|
|
.It Dv SF_ARCHIVED
|
|
The file has been archived.
|
|
This flag means the opposite of the DOS, Windows and CIFS
|
|
FILE_ATTRIBUTE_ARCHIVE attribute.
|
|
This flag has been deprecated, and may be removed in a future release.
|
|
.It Dv SF_IMMUTABLE
|
|
The file may not be changed.
|
|
.It Dv SF_NOUNLINK
|
|
The file may not be renamed or deleted.
|
|
.It Dv SF_SNAPSHOT
|
|
The file is a snapshot file.
|
|
.It Dv UF_APPEND
|
|
The file may only be appended to.
|
|
.It Dv UF_ARCHIVE
|
|
The file needs to be archived.
|
|
This flag has the same meaning as the DOS, Windows and CIFS
|
|
FILE_ATTRIBUTE_ARCHIVE attribute.
|
|
Filesystems in FreeBSD may or may not have special handling for this flag.
|
|
For instance, ZFS tracks changes to files and will set this bit when a
|
|
file is updated.
|
|
UFS only stores the flag, and relies on the application to change it when
|
|
needed.
|
|
.It Dv UF_HIDDEN
|
|
The file may be hidden from directory listings at the application's
|
|
discretion.
|
|
The file has the DOS, Windows and CIFS FILE_ATTRIBUTE_HIDDEN attribute.
|
|
.It Dv UF_IMMUTABLE
|
|
The file may not be changed.
|
|
.It Dv UF_NODUMP
|
|
Do not dump the file.
|
|
.It Dv UF_NOUNLINK
|
|
The file may not be renamed or deleted.
|
|
.It Dv UF_OFFLINE
|
|
The file is offline, or has the Windows and CIFS FILE_ATTRIBUTE_OFFLINE
|
|
attribute.
|
|
Filesystems in FreeBSD store and display this flag, but do not provide any
|
|
special handling when it is set.
|
|
.It Dv UF_OPAQUE
|
|
The directory is opaque when viewed through a union stack.
|
|
.It Dv UF_READONLY
|
|
The file is read only, and may not be written or appended.
|
|
Filesystems may use this flag to maintain compatibility with the DOS, Windows
|
|
and CIFS FILE_ATTRIBUTE_READONLY attribute.
|
|
.It Dv UF_REPARSE
|
|
The file contains a Windows reparse point and has the Windows and CIFS
|
|
FILE_ATTRIBUTE_REPARSE_POINT attribute.
|
|
.It Dv UF_SPARSE
|
|
The file has the Windows FILE_ATTRIBUTE_SPARSE_FILE attribute.
|
|
This may also be used by a filesystem to indicate a sparse file.
|
|
.It Dv UF_SYSTEM
|
|
The file has the DOS, Windows and CIFS FILE_ATTRIBUTE_SYSTEM attribute.
|
|
Filesystems in FreeBSD may store and display this flag, but do not provide
|
|
any special handling when it is set.
|
|
.El
|
|
.Pp
|
|
If one of
|
|
.Dv SF_IMMUTABLE , SF_APPEND ,
|
|
or
|
|
.Dv SF_NOUNLINK
|
|
is set a non-super-user cannot change any flags and even the super-user
|
|
can change flags only if securelevel is 0.
|
|
(See
|
|
.Xr init 8
|
|
for details.)
|
|
.Pp
|
|
The
|
|
.Dv UF_IMMUTABLE , UF_APPEND , UF_NOUNLINK , UF_NODUMP ,
|
|
and
|
|
.Dv UF_OPAQUE
|
|
flags may be set or unset by either the owner of a file or the super-user.
|
|
.Pp
|
|
The
|
|
.Dv SF_IMMUTABLE , SF_APPEND , SF_NOUNLINK ,
|
|
and
|
|
.Dv SF_ARCHIVED
|
|
flags may only be set or unset by the super-user.
|
|
Attempts to toggle these flags by non-super-users are rejected.
|
|
These flags may be set at any time, but normally may only be unset when
|
|
the system is in single-user mode.
|
|
(See
|
|
.Xr init 8
|
|
for details.)
|
|
.Pp
|
|
The implementation of all flags is filesystem-dependent.
|
|
See the description of the
|
|
.Dv UF_ARCHIVE
|
|
flag above for one example of the differences in behavior.
|
|
Care should be exercised when writing applications to account for
|
|
support or lack of support of these flags in various filesystems.
|
|
.Pp
|
|
The
|
|
.Dv SF_SNAPSHOT
|
|
flag is maintained by the system and cannot be toggled.
|
|
.Sh RETURN VALUES
|
|
.Rv -std
|
|
.Sh ERRORS
|
|
The
|
|
.Fn chflags
|
|
system call will fail if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er ENOTDIR
|
|
A component of the path prefix is not a directory.
|
|
.It Bq Er ENAMETOOLONG
|
|
A component of a pathname exceeded 255 characters,
|
|
or an entire path name exceeded 1023 characters.
|
|
.It Bq Er ENOENT
|
|
The named file does not exist.
|
|
.It Bq Er EACCES
|
|
Search permission is denied for a component of the path prefix.
|
|
.It Bq Er ELOOP
|
|
Too many symbolic links were encountered in translating the pathname.
|
|
.It Bq Er EPERM
|
|
The effective user ID does not match the owner of the file and
|
|
the effective user ID is not the super-user.
|
|
.It Bq Er EPERM
|
|
One of
|
|
.Dv SF_IMMUTABLE , SF_APPEND ,
|
|
or
|
|
.Dv SF_NOUNLINK
|
|
is set and the user is either not the super-user or
|
|
securelevel is greater than 0.
|
|
.It Bq Er EPERM
|
|
A non-super-user attempted to toggle one of
|
|
.Dv SF_ARCHIVED , SF_IMMUTABLE , SF_APPEND ,
|
|
or
|
|
.Dv SF_NOUNLINK .
|
|
.It Bq Er EPERM
|
|
An attempt was made to toggle the
|
|
.Dv SF_SNAPSHOT
|
|
flag.
|
|
.It Bq Er EROFS
|
|
The named file resides on a read-only file system.
|
|
.It Bq Er EFAULT
|
|
The
|
|
.Fa path
|
|
argument
|
|
points outside the process's allocated address space.
|
|
.It Bq Er EIO
|
|
An
|
|
.Tn I/O
|
|
error occurred while reading from or writing to the file system.
|
|
.It Bq Er EOPNOTSUPP
|
|
The underlying file system does not support file flags, or
|
|
does not support all of the flags set in
|
|
.Fa flags .
|
|
.El
|
|
.Pp
|
|
The
|
|
.Fn fchflags
|
|
system call will fail if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EBADF
|
|
The descriptor is not valid.
|
|
.It Bq Er EINVAL
|
|
The
|
|
.Fa fd
|
|
argument
|
|
refers to a socket, not to a file.
|
|
.It Bq Er EPERM
|
|
The effective user ID does not match the owner of the file and
|
|
the effective user ID is not the super-user.
|
|
.It Bq Er EPERM
|
|
One of
|
|
.Dv SF_IMMUTABLE , SF_APPEND ,
|
|
or
|
|
.Dv SF_NOUNLINK
|
|
is set and the user is either not the super-user or
|
|
securelevel is greater than 0.
|
|
.It Bq Er EPERM
|
|
A non-super-user attempted to toggle one of
|
|
.Dv SF_ARCHIVED , SF_IMMUTABLE , SF_APPEND ,
|
|
or
|
|
.Dv SF_NOUNLINK .
|
|
.It Bq Er EPERM
|
|
An attempt was made to toggle the
|
|
.Dv SF_SNAPSHOT
|
|
flag.
|
|
.It Bq Er EROFS
|
|
The file resides on a read-only file system.
|
|
.It Bq Er EIO
|
|
An
|
|
.Tn I/O
|
|
error occurred while reading from or writing to the file system.
|
|
.It Bq Er EOPNOTSUPP
|
|
The underlying file system does not support file flags, or
|
|
does not support all of the flags set in
|
|
.Fa flags .
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr chflags 1 ,
|
|
.Xr fflagstostr 3 ,
|
|
.Xr strtofflags 3 ,
|
|
.Xr init 8 ,
|
|
.Xr mount_unionfs 8
|
|
.Sh HISTORY
|
|
The
|
|
.Fn chflags
|
|
and
|
|
.Fn fchflags
|
|
system calls first appeared in
|
|
.Bx 4.4 .
|
|
The
|
|
.Fn lchflags
|
|
system call first appeared in
|
|
.Fx 5.0 .
|
|
The
|
|
.Fn chflagsat
|
|
system call first appeared in
|
|
.Fx 10.0 .
|