105 lines
3.8 KiB
Groff
105 lines
3.8 KiB
Groff
.\" Copyright (c) 1994
|
|
.\" Jan-Simon Pendry
|
|
.\" 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. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 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.
|
|
.\"
|
|
.\" 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.
|
|
.\"
|
|
.\" @(#)undelete.2 8.4 (Berkeley) 10/18/94
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd October 18, 1994
|
|
.Dt UNDELETE 2
|
|
.Os BSD 4
|
|
.Sh NAME
|
|
.Nm undelete
|
|
.Nd attempt to recover a deleted file
|
|
.Sh SYNOPSIS
|
|
.Fd #include <unistd.h>
|
|
.Ft int
|
|
.Fn undelete "const char *path"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn undelete
|
|
function attempts to recover the deleted file named by
|
|
.Fa path .
|
|
Currently, this works only when the named object
|
|
is a whiteout in a union filesystem.
|
|
The system call removes the whiteout causing
|
|
any objects in a lower layer of the
|
|
union stack to become visible once more.
|
|
.Pp
|
|
Eventually, the
|
|
.Nm undelete
|
|
functionality may be expanded to other filesystems able to recover
|
|
deleted files such as the log-structured filesystem.
|
|
.Sh RETURN VALUES
|
|
Upon successful completion, a value of 0 is returned.
|
|
Otherwise, a value of -1 is returned and
|
|
.Va errno
|
|
is set to indicate the error.
|
|
.Sh ERRORS
|
|
The
|
|
.Fn undelete
|
|
succeeds unless:
|
|
.Bl -tag -width ENAMETOOLONGAA
|
|
.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 EEXIST
|
|
The path does not reference a whiteout.
|
|
.It Bq Er ENOENT
|
|
The named whiteout does not exist.
|
|
.It Bq Er EACCES
|
|
Search permission is denied for a component of the path prefix.
|
|
.It Bq Er EACCES
|
|
Write permission is denied on the directory containing the name
|
|
to be undeleted.
|
|
.It Bq Er ELOOP
|
|
Too many symbolic links were encountered in translating the pathname.
|
|
.It Bq Er EPERM
|
|
The directory containing the name is marked sticky,
|
|
and the containing directory is not owned by the effective user ID.
|
|
.It Bq Er EIO
|
|
An I/O error occurred while updating the directory entry.
|
|
.It Bq Er EROFS
|
|
The name resides on a read-only file system.
|
|
.It Bq Er EFAULT
|
|
.Fa Path
|
|
points outside the process's allocated address space.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr unlink 2 ,
|
|
.Xr mount_union 8
|
|
.Sh HISTORY
|
|
An
|
|
.Nm undelete
|
|
function call first appeared in 4.4BSD-Lite.
|