2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
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6.3 KiB
Groff
242 lines
6.3 KiB
Groff
.\" $NetBSD: rename.2,v 1.23 2010/05/31 12:16:20 njoly 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 December 27, 2005
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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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.Brq Dv NAME_MAX
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characters, or an entire path name exceeded
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.Brq 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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.It Bq Er EBUSY
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.Fa from
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or
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.Fa to
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is the mount point for a mounted file system.
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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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