237 lines
6.2 KiB
Groff
237 lines
6.2 KiB
Groff
.\" $NetBSD: rename.2,v 1.20 2003/08/07 16:44:05 agc Exp $
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.\"
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.\" Copyright (c) 1983, 1991, 1993
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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. 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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.\" @(#)rename.2 8.1 (Berkeley) 6/4/93
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.\"
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.Dd June 4, 1993
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.Dt RENAME 2
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.Os
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.Sh NAME
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.Nm rename
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.Nd change the name of a file
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In stdio.h
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.Ft int
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.Fn rename "const char *from" "const char *to"
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.Sh DESCRIPTION
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.Fn rename
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causes the link named
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.Fa from
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to be renamed as
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.Fa to .
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If
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.Fa to
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exists, it is first removed.
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Both
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.Fa from
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and
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.Fa to
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must be of the same type (that is, both directories or both
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non-directories), and must reside on the same file system.
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.Pp
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.Fn rename
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guarantees that an instance of
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.Fa to
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will always exist, even if the system should crash in
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the middle of the operation.
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.Pp
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If the final component of
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.Fa from
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is a symbolic link,
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the symbolic link is renamed,
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not the file or directory to which it points.
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.Pp
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If both
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.Fa from
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and
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.Fa to
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are pathnames of the same existing file in the file system's name space,
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.Fn rename
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returns successfully and performs no other action.
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.Sh RETURN VALUES
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A 0 value is returned if the operation succeeds, otherwise
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.Fn rename
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returns -1 and the global variable
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.Va errno
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indicates the reason for the failure.
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.Sh ERRORS
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.Fn rename
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will fail and neither of the argument files will be
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affected if:
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.Bl -tag -width Er
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.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded
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.Dv {NAME_MAX}
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characters, or an entire path name exceeded
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.Dv {PATH_MAX}
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characters.
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.It Bq Er ENOENT
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A component of the
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.Fa from
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path does not exist,
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or a path prefix of
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.Fa to
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does not exist.
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.It Bq Er EACCES
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A component of either path prefix denies search permission, or
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the requested link requires writing in a directory with a mode
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that denies write permission.
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.It Bq Er EPERM
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The directory containing
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.Fa from
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is marked sticky,
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and neither the containing directory nor
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.Fa from
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are owned by the effective user ID.
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Or the
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.Fa to
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file exists,
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the directory containing
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.Fa to
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is marked sticky,
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and neither the containing directory nor
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.Fa to
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are owned by the effective user ID.
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.It Bq Er ELOOP
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Too many symbolic links were encountered in translating either pathname.
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.It Bq Er ENOTDIR
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A component of either path prefix is not a directory, or
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.Fa from
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is a directory, but
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.Fa to
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is not a directory.
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.It Bq Er EISDIR
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.Fa to
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is a directory, but
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.Fa from
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is not a directory.
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.It Bq Er EXDEV
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The link named by
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.Fa to
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and the file named by
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.Fa from
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are on different logical devices (file systems).
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Note that this error code will not be returned if the implementation
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permits cross-device links.
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.It Bq Er ENOSPC
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The directory in which the entry for the new name is being placed
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cannot be extended because there is no space left on the file
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system containing the directory.
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.It Bq Er EDQUOT
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The directory in which the entry for the new name
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is being placed cannot be extended because the
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user's quota of disk blocks on the file system
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containing the directory has been exhausted.
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.It Bq Er EIO
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An I/O error occurred while making or updating a directory entry.
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.It Bq Er EROFS
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The requested link requires writing in a directory on a read-only file
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system.
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.It Bq Er EFAULT
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.Em Path
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points outside the process's allocated address space.
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.It Bq Er EINVAL
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.Fa from
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is a parent directory of
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.Fa to ,
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or an attempt is made to rename
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.Ql \&.
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or
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.Ql \&.. .
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.It Bq Er ENOTEMPTY
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.Fa to
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is a directory and is not empty.
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.El
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.Sh SEE ALSO
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.Xr open 2 ,
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.Xr symlink 7
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.Sh STANDARDS
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The
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.Fn rename
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function deviates from the semantics defined in
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.St -p1003.1-90 ,
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which specifies that if both
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.Fa from
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and
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.Fa to
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.Em link
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to the same existing file,
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.Fn rename
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shall return successfully and performs no further action, whereas this
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implementation will remove the file specified by
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.Fa from
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unless both
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.Fa from
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and
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.Fa to
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are pathnames of the same file in the file system's name space.
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.Pp
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To retain conformance, a compatibility interface is provided by the
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.Lb libposix
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which is also be brought into scope if any of the
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.Dv _POSIX_SOURCE ,
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.Dv _POSIX_C_SOURCE
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or
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.Dv _XOPEN_SOURCE
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preprocessor symbols are defined at compile-time:
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the
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.Fn rename
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function conforms to
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.St -p1003.1-90
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and
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.St -xpg4.2 .
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.Sh BUGS
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The system can deadlock if a loop in the file system graph is present.
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This loop takes the form of an entry in directory
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.Ql Pa a ,
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say
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.Ql Pa a/foo ,
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being a hard link to directory
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.Ql Pa b ,
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and an entry in
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directory
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.Ql Pa b ,
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say
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.Ql Pa b/bar ,
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being a hard link
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to directory
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.Ql Pa a .
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When such a loop exists and two separate processes attempt to
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perform
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.Ql rename a/foo b/bar
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and
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.Ql rename b/bar a/foo ,
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respectively,
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the system may deadlock attempting to lock
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both directories for modification.
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Hard links to directories should be
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replaced by symbolic links by the system administrator.
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