freebsd-skq/lib/libc/sys/chflags.2

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.\" Copyright (c) 1989, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" 1. Redistributions of source code must retain the above copyright
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.\" 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.
.\" 4. 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.
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" @(#)chflags.2 8.3 (Berkeley) 5/2/95
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.\" $FreeBSD$
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.\"
.Dd Apr 13, 2012
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.Dt CHFLAGS 2
.Os
.Sh NAME
.Nm chflags ,
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.Nm lchflags ,
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.Nm fchflags
.Nd set file flags
.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.In sys/stat.h
.In unistd.h
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.Ft int
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.Fn chflags "const char *path" "u_long flags"
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.Ft int
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.Fn lchflags "const char *path" "int flags"
.Ft int
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.Fn fchflags "int fd" "u_long flags"
.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
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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
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The flags specified are formed by
.Em or Ns 'ing
the following values
.Pp
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.Bl -tag -width ".Dv SF_IMMUTABLE" -compact -offset indent
.It Dv UF_NODUMP
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Do not dump the file.
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.It Dv UF_IMMUTABLE
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The file may not be changed.
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.It Dv UF_APPEND
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The file may only be appended to.
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.It Dv UF_NOUNLINK
The file may not be renamed or deleted.
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.It Dv UF_OPAQUE
The directory is opaque when viewed through a union stack.
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.It Dv SF_ARCHIVED
The file may be archived.
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.It Dv SF_IMMUTABLE
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The file may not be changed.
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.It Dv SF_APPEND
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The file may only be appended to.
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.It Dv SF_NOUNLINK
The file may not be renamed or deleted.
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.It Dv SF_SNAPSHOT
The file is a snapshot file.
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.El
.Pp
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If one of
.Dv SF_IMMUTABLE , SF_APPEND ,
or
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.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 greater than 0.
(See
.Xr init 8
for details.)
.Pp
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The
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.Dv UF_IMMUTABLE , UF_APPEND , UF_NOUNLINK , UF_NODUMP ,
and
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.Dv UF_OPAQUE
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flags may be set or unset by either the owner of a file or the super-user.
.Pp
The
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.Dv SF_IMMUTABLE , SF_APPEND , SF_NOUNLINK ,
and
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.Dv SF_ARCHIVED
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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
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the system is in single-user mode.
(See
.Xr init 8
for details.)
.Pp
The
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.Dv SF_SNAPSHOT
flag is maintained by the system and cannot be toggled.
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.Sh RETURN VALUES
.Rv -std
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.Sh ERRORS
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The
.Fn chflags
system call will fail if:
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.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
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.Dv SF_IMMUTABLE , SF_APPEND ,
or
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.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
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.Dv SF_NOUNLINK .
.It Bq Er EPERM
An attempt was made to toggle the
.Dv SF_SNAPSHOT
flag.
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.It Bq Er EROFS
The named file resides on a read-only file system.
.It Bq Er EFAULT
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The
.Fa path
argument
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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 .
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.El
.Pp
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The
.Fn fchflags
system call will fail if:
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.Bl -tag -width Er
.It Bq Er EBADF
The descriptor is not valid.
.It Bq Er EINVAL
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The
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.Fa fd
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argument
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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
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.Dv SF_IMMUTABLE , SF_APPEND ,
or
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.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
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.Dv SF_NOUNLINK .
.It Bq Er EPERM
An attempt was made to toggle the
.Dv SF_SNAPSHOT
flag.
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.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.
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.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 .
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.El
.Sh SEE ALSO
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.Xr chflags 1 ,
.Xr fflagstostr 3 ,
.Xr strtofflags 3 ,
.Xr init 8 ,
.Xr mount_unionfs 8
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.Sh HISTORY
The
.Fn chflags
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and
.Fn fchflags
system calls first appeared in
.Bx 4.4 .