106 lines
3.8 KiB
Groff
106 lines
3.8 KiB
Groff
.\" Copyright (c) 1994
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.\" Jan-Simon Pendry
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)undelete.2 8.4 (Berkeley) 10/18/94
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.\"
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.Dd October 18, 1994
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.Dt UNDELETE 2
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.Os BSD 4
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.Sh NAME
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.Nm undelete
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.Nd attempt to recover a deleted file
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.Sh SYNOPSIS
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.Fd #include <unistd.h>
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.Ft int
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.Fn undelete "const char *path"
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.Sh DESCRIPTION
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The
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.Fn undelete
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function attempts to recover the deleted file named by
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.Fa path .
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Currently, this works only when the named object
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is a whiteout in a union filesystem.
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The system call removes the whiteout causing
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any objects in a lower layer of the
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union stack to become visible once more.
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.Pp
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Eventually, the
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.Nm undelete
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functionality may be expanded to other filesystems able to recover
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deleted files such as the log-structured filesystem.
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.Sh RETURN VALUES
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Upon successful completion, a value of 0 is returned.
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Otherwise, a value of -1 is returned and
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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The
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.Fn undelete
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succeeds unless:
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.Bl -tag -width ENAMETOOLONGAA
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.It Bq Er ENOTDIR
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A component of the path prefix is not a directory.
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.It Bq Er EINVAL
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The pathname contains a character with the high-order bit set.
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.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded 255 characters,
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or an entire path name exceeded 1023 characters.
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.It Bq Er EEXIST
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The path does not reference a whiteout.
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.It Bq Er ENOENT
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The named whiteout does not exist.
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.It Bq Er EACCES
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Search permission is denied for a component of the path prefix.
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.It Bq Er EACCES
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Write permission is denied on the directory containing the name
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to be undeleted.
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.It Bq Er ELOOP
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Too many symbolic links were encountered in translating the pathname.
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.It Bq Er EPERM
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The directory containing the name is marked sticky,
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and the containing directory is not owned by the effective user ID.
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.It Bq Er EIO
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An I/O error occurred while updating the directory entry.
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.It Bq Er EROFS
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The name resides on a read-only file system.
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.It Bq Er EFAULT
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.Fa Path
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points outside the process's allocated address space.
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.El
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.Sh SEE ALSO
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.Xr unlink 2 ,
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.Xr mount_union 8
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.Sh HISTORY
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An
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.Nm undelete
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function call first appeared in 4.4BSD-Lite.
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