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-.\" Copyright (c) 1983, 1991, 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. 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.
-.\"
-.\"     @(#)rename.2	8.1 (Berkeley) 6/4/93
-.\"	$Id$
-.\"
-.Dd June 4, 1993
-.Dt RENAME 2
-.Os BSD 4.2
-.Sh NAME
-.Nm rename
-.Nd change the name of a file
-.Sh SYNOPSIS
-.Fd #include <stdio.h>
-.Ft int
-.Fn rename "const char *from" "const char *to"
-.Sh DESCRIPTION
-.Fn Rename
-causes the link named
-.Fa from
-to be renamed as
-.Fa to .
-If 
-.Fa to
-exists, it is first removed.
-Both 
-.Fa from
-and
-.Fa to
-must be of the same type (that is, both directories or both
-non-directories), and must reside on the same file system.
-.Pp
-.Fn Rename
-guarantees that an instance of
-.Fa to
-will always exist, even if the system should crash in
-the middle of the operation.
-.Pp
-If the final component of
-.Fa from
-is a symbolic link,
-the symbolic link is renamed,
-not the file or directory to which it points.
-.Sh CAVEAT
-The system can deadlock if a loop in the file system graph is present.
-This loop takes the form of an entry in directory
-.Ql Pa a ,
-say
-.Ql Pa a/foo ,
-being a hard link to directory
-.Ql Pa b ,
-and an entry in
-directory
-.Ql Pa b ,
-say
-.Ql Pa b/bar ,
-being a hard link
-to directory
-.Ql Pa a .
-When such a loop exists and two separate processes attempt to
-perform
-.Ql rename a/foo b/bar
-and
-.Ql rename b/bar a/foo ,
-respectively, 
-the system may deadlock attempting to lock
-both directories for modification.
-Hard links to directories should be
-replaced by symbolic links by the system administrator.
-.Sh RETURN VALUES
-A 0 value is returned if the operation succeeds, otherwise
-.Fn rename
-returns -1 and the global variable 
-.Va errno
-indicates the reason for the failure.
-.Sh ERRORS
-.Fn Rename
-will fail and neither of the argument files will be
-affected if:
-.Bl -tag -width ENAMETOOLONG
-.It Bq Er ENAMETOOLONG
-A component of either pathname exceeded 255 characters,
-or the entire length of either path name exceeded 1023 characters.
-.It Bq Er ENOENT
-A component of the
-.Fa from
-path does not exist,
-or a path prefix of
-.Fa to
-does not exist.
-.It Bq Er EACCES
-A component of either path prefix denies search permission.
-.It Bq Er EACCES
-The requested link requires writing in a directory with a mode
-that denies write permission.
-.It Bq Er EPERM
-The directory containing
-.Fa from
-is marked sticky,
-and neither the containing directory nor
-.Fa from
-are owned by the effective user ID.
-.It Bq Er EPERM
-The
-.Fa to
-file exists,
-the directory containing
-.Fa to
-is marked sticky,
-and neither the containing directory nor
-.Fa to
-are owned by the effective user ID.
-.It Bq Er ELOOP
-Too many symbolic links were encountered in translating either pathname.
-.It Bq Er ENOTDIR
-A component of either path prefix is not a directory.
-.It Bq Er ENOTDIR
-.Fa from
-is a directory, but
-.Fa to
-is not a directory.
-.It Bq Er EISDIR
-.Fa to
-is a directory, but
-.Fa from
-is not a directory.
-.It Bq Er EXDEV
-The link named by
-.Fa to
-and the file named by
-.Fa from
-are on different logical devices (file systems).  Note that this error
-code will not be returned if the implementation permits cross-device
-links.
-.It Bq Er ENOSPC
-The directory in which the entry for the new name is being placed
-cannot be extended because there is no space left on the file
-system containing the directory.
-.It Bq Er EDQUOT
-The directory in which the entry for the new name
-is being placed cannot be extended because the
-user's quota of disk blocks on the file system
-containing the directory has been exhausted.
-.It Bq Er EIO
-An I/O error occurred while making or updating a directory entry.
-.It Bq Er EROFS
-The requested link requires writing in a directory on a read-only file
-system.
-.It Bq Er EFAULT
-.Em Path
-points outside the process's allocated address space.
-.It Bq Er EINVAL
-.Fa From
-is a parent directory of
-.Fa to ,
-or an attempt is made to rename
-.Ql \&.
-or
-.Ql \&.. .
-.It Bq Er ENOTEMPTY
-.Fa To
-is a directory and is not empty.
-.El
-.Sh SEE ALSO
-.Xr open 2 ,
-.Xr symlink 7
-.Sh STANDARDS
-The
-.Fn rename
-function call is expected to conform to 
-.St -p1003.1-90 .