3700c24576
behaviour of returning EINVAL when ".." is passed as either argument
has been restored.
rmdir("..") now returns EINVAL instead of EPERM. Document the
previously undocumented behaviour of rmdir(".") returning EINVAL
as required by POSIX and SUSv3. Bump the man page change date.
undelete("..") now returns EINVAL instead of EPERM. Bump the man
page change date.
MFC after: 3 days
110 lines
3.7 KiB
Groff
110 lines
3.7 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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.\" $FreeBSD$
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.\"
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.Dd January 22, 2006
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.Dt UNDELETE 2
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.Os
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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 LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In 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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system call 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 file system.
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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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.Fn undelete
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functionality may be expanded to other file systems able to recover
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deleted files such as the log-structured file system.
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.Sh RETURN VALUES
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.Rv -std undelete
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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 Er
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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 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 EINVAL
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The last component of the path is
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.Ql .. .
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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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The
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.Fa path
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argument
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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_unionfs 8
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.Sh HISTORY
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The
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.Fn undelete
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system call first appeared in
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.Bx 4.4 Lite .
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