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+.\"	$NetBSD: chflags.2,v 1.28 2013/06/08 06:05:03 kardel Exp $
+.\"
+.\" 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
+.\"
+.Dd August 6, 2011
+.Dt CHFLAGS 2
+.Os
+.Sh NAME
+.Nm chflags ,
+.Nm lchflags ,
+.Nm fchflags
+.Nd set file flags
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/stat.h
+.In unistd.h
+.Ft int
+.Fn chflags "const char *path"  "u_long flags"
+.Ft int
+.Fn lchflags "const char *path"  "u_long flags"
+.Ft int
+.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 .
+For
+.Fn lchflags ,
+symbolic links are not traversed and thus their modes may be changed with
+this call.
+.Pp
+The flags specified are formed by
+.Em or Ns 'ing
+the following values:
+.Pp
+.Bl -tag -width "SF_IMMUTABLE" -compact -offset indent
+.It Dv UF_NODUMP
+Do not dump the file.
+.It Dv UF_IMMUTABLE
+The file may not be changed.
+.It Dv UF_APPEND
+The file may only be appended to.
+.It Dv UF_OPAQUE
+The file (if a directory) is opaque for union mounts.
+.It Dv SF_ARCHIVED
+The file is archived.
+.It Dv SF_IMMUTABLE
+The file may not be changed.
+.It Dv SF_APPEND
+The file may only be appended to.
+.El
+.Pp
+The
+.Dv UF_NODUMP ,
+.Dv UF_IMMUTABLE ,
+.Dv UF_APPEND ,
+and
+.Dv UF_OPAQUE
+flags may be set or unset by either the owner of a file or the super-user,
+except on block and character devices, where only the super-user may set
+or unset them.
+.Pp
+The
+.Dv SF_ARCHIVED ,
+.Dv SF_IMMUTABLE ,
+and
+.Dv SF_APPEND
+flags may only be set or unset by the super-user.
+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.)
+.Sh RETURN VALUES
+Upon successful completion, a value of 0 is returned.
+Otherwise, \-1 is returned and the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+.Fn chflags
+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
+.Brq Dv NAME_MAX
+characters, or an entire path name exceeded
+.Brq Dv PATH_MAX
+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, or
+the effective user ID is not the super-user and one or more of the
+super-user-only flags for the named file would be changed.
+.It Bq Er EOPNOTSUPP
+The named file resides on a file system that does not support file
+flags.
+.It Bq Er EROFS
+The named file resides on a read-only file system.
+.It Bq Er EFAULT
+.Fa path
+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.
+.El
+.Pp
+.Fn fchflags
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The descriptor is not valid.
+.It Bq Er EINVAL
+.Fa fd
+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, or
+the effective user ID is not the super-user and one or more of the
+super-user-only flags for the file would be changed.
+.It Bq Er EOPNOTSUPP
+The file resides on a file system that does not support file flags.
+.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.
+.El
+.Sh SEE ALSO
+.Xr chflags 1 ,
+.Xr stat 2 ,
+.Xr stat_flags 3 ,
+.Xr init 8 ,
+.Xr mount_union 8
+.Sh HISTORY
+The
+.Fn chflags
+and
+.Fn fchflags
+functions first appeared in
+.Bx 4.4 .
+The
+.Fn lchflags
+function first appeared in
+.Nx 1.5 .