1994-05-27 05:00:24 +00:00
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.\" Copyright (c) 1980, 1991, 1993, 1994
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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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2017-02-28 23:42:47 +00:00
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.\" 3. Neither the name of the University nor the names of its contributors
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1994-05-27 05:00:24 +00:00
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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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.\" @(#)chown.2 8.4 (Berkeley) 4/19/94
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1999-08-28 00:22:10 +00:00
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.\" $FreeBSD$
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1994-05-27 05:00:24 +00:00
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.\"
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2021-03-07 14:29:09 +00:00
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.Dd March 30, 2021
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1994-05-27 05:00:24 +00:00
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.Dt CHOWN 2
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2001-07-10 13:41:46 +00:00
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.Os
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1994-05-27 05:00:24 +00:00
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.Sh NAME
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.Nm chown ,
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1997-03-31 12:37:35 +00:00
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.Nm fchown ,
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2008-04-16 13:03:12 +00:00
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.Nm lchown ,
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.Nm fchownat
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1994-05-27 05:00:24 +00:00
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.Nd change owner and group of a file
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2000-04-21 09:42:15 +00:00
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.Sh LIBRARY
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.Lb libc
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1994-05-27 05:00:24 +00:00
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.Sh SYNOPSIS
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2001-10-01 16:09:29 +00:00
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.In unistd.h
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1994-05-27 05:00:24 +00:00
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.Ft int
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.Fn chown "const char *path" "uid_t owner" "gid_t group"
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.Ft int
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1995-02-17 00:41:30 +00:00
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.Fn fchown "int fd" "uid_t owner" "gid_t group"
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1997-03-31 12:37:35 +00:00
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.Ft int
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.Fn lchown "const char *path" "uid_t owner" "gid_t group"
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2008-04-16 13:03:12 +00:00
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.Ft int
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.Fn fchownat "int fd" "const char *path" "uid_t owner" "gid_t group" "int flag"
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1994-05-27 05:00:24 +00:00
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.Sh DESCRIPTION
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The owner ID and group ID of the file
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named by
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.Fa path
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or referenced by
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.Fa fd
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is changed as specified by the arguments
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.Fa owner
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and
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.Fa group .
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The owner of a file may change the
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.Fa group
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to a group of which
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he or she is a member,
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but the change
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.Fa owner
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capability is restricted to the super-user.
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.Pp
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2002-07-15 20:59:12 +00:00
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The
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.Fn chown
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2002-12-18 09:22:32 +00:00
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system call
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1994-05-27 05:00:24 +00:00
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clears the set-user-id and set-group-id bits
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on the file
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to prevent accidental or mischievous creation of
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1996-02-08 19:06:06 +00:00
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set-user-id and set-group-id programs if not executed
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by the super-user.
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2002-12-18 09:22:32 +00:00
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The
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1997-03-31 12:37:35 +00:00
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.Fn chown
|
2002-12-18 09:22:32 +00:00
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system call
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1997-03-31 12:37:35 +00:00
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follows symbolic links to operate on the target of the link
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rather than the link itself.
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1994-05-27 05:00:24 +00:00
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.Pp
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2002-07-15 20:59:12 +00:00
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The
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.Fn fchown
|
2002-12-18 09:22:32 +00:00
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system call
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1994-05-27 05:00:24 +00:00
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is particularly useful when used in conjunction
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with the file locking primitives (see
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.Xr flock 2 ) .
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.Pp
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2002-07-15 20:59:12 +00:00
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The
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.Fn lchown
|
2002-12-18 09:22:32 +00:00
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system call is similar to
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1997-03-31 12:37:35 +00:00
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.Fn chown
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but does not follow symbolic links.
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.Pp
|
2008-04-16 13:03:12 +00:00
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The
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.Fn fchownat
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system call is equivalent to the
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.Fn chown
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and
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.Fn lchown
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except in the case where
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.Fa path
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specifies a relative path.
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In this case the file to be changed is determined relative to the directory
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associated with the file descriptor
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.Fa fd
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instead of the current working directory.
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.Pp
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Values for
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.Fa flag
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are constructed by a bitwise-inclusive OR of flags from the following
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list, defined in
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.In fcntl.h :
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.Bl -tag -width indent
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.It Dv AT_SYMLINK_NOFOLLOW
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If
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.Fa path
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names a symbolic link, ownership of the symbolic link is changed.
|
2020-09-22 22:54:54 +00:00
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.It Dv AT_RESOLVE_BENEATH
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2021-02-16 03:31:40 +00:00
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Only walk paths below the directory specified by the
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.Ar fd
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descriptor.
|
2020-09-22 22:54:54 +00:00
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See the description of the
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.Dv O_RESOLVE_BENEATH
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flag in the
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.Xr open 2
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manual page.
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2021-03-07 14:29:09 +00:00
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.It Dv AT_EMPTY_PATH
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If the
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.Fa path
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argument is an empty string, operate on the file or directory
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referenced by the descriptor
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.Fa fd .
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If
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.Fa fd
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is equal to
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.Dv AT_FDCWD ,
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operate on the current working directory.
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2008-04-16 13:03:12 +00:00
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.El
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.Pp
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If
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.Fn fchownat
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is passed the special value
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.Dv AT_FDCWD
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in the
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.Fa fd
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parameter, the current working directory is used and the behavior is identical
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to a call to
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.Fn chown
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or
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.Fn lchown
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respectively, depending on whether or not the
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.Dv AT_SYMLINK_NOFOLLOW
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bit is set in the
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.Fa flag
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argument.
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.Pp
|
1994-05-27 05:00:24 +00:00
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One of the owner or group id's
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may be left unchanged by specifying it as -1.
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.Sh RETURN VALUES
|
2001-08-31 09:57:38 +00:00
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.Rv -std
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1994-05-27 05:00:24 +00:00
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.Sh ERRORS
|
2002-07-15 20:59:12 +00:00
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The
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.Fn chown
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1997-03-31 12:37:35 +00:00
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and
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.Fn lchown
|
1994-05-27 05:00:24 +00:00
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will fail and the file will be unchanged if:
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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 ENOENT
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The named file 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 ELOOP
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Too many symbolic links were encountered in translating the pathname.
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.It Bq Er EPERM
|
2006-12-13 11:46:38 +00:00
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The operation would change the ownership, but the effective user ID is not the
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super-user.
|
2006-12-09 22:41:26 +00:00
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.It Bq Er EPERM
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2006-12-13 22:17:58 +00:00
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The named file has its immutable or append-only flag set, see the
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2006-12-09 22:41:26 +00:00
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.Xr chflags 2
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manual page for more information.
|
1994-05-27 05:00:24 +00:00
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.It Bq Er EROFS
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The named file resides on a read-only file system.
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.It Bq Er EFAULT
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2002-12-19 09:40:28 +00:00
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The
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.Fa path
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argument
|
1994-05-27 05:00:24 +00:00
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points outside the process's allocated address space.
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.It Bq Er EIO
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An I/O error occurred while reading from or writing to the file system.
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2020-03-30 21:44:00 +00:00
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.It Bq Er EINTEGRITY
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Corrupted data was detected while reading from the file system.
|
1994-05-27 05:00:24 +00:00
|
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.El
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.Pp
|
2002-07-15 20:59:12 +00:00
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The
|
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|
.Fn fchown
|
2002-12-18 09:22:32 +00:00
|
|
|
system call will fail if:
|
1994-05-27 05:00:24 +00:00
|
|
|
.Bl -tag -width Er
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.It Bq Er EBADF
|
2002-12-19 09:40:28 +00:00
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The
|
2000-12-29 14:08:20 +00:00
|
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|
.Fa fd
|
2002-12-19 09:40:28 +00:00
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argument
|
1994-05-27 05:00:24 +00:00
|
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|
does not refer to a valid descriptor.
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.It Bq Er EINVAL
|
2002-12-19 09:40:28 +00:00
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The
|
2000-12-29 14:08:20 +00:00
|
|
|
.Fa fd
|
2002-12-19 09:40:28 +00:00
|
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argument
|
1994-05-27 05:00:24 +00:00
|
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|
refers to a socket, not a file.
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.It Bq Er EPERM
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|
The effective user ID is not the super-user.
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.It Bq Er EROFS
|
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|
The named file resides on a read-only file system.
|
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.It Bq Er EIO
|
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|
|
An I/O error occurred while reading from or writing to the file system.
|
2020-03-30 21:44:00 +00:00
|
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|
.It Bq Er EINTEGRITY
|
|
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|
Corrupted data was detected while reading from the file system.
|
1994-05-27 05:00:24 +00:00
|
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|
.El
|
2008-04-16 13:03:12 +00:00
|
|
|
.Pp
|
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|
|
In addition to the errors specified for
|
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|
.Fn chown
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and
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.Fn lchown ,
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the
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.Fn fchownat
|
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|
system call may fail if:
|
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|
.Bl -tag -width Er
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|
.It Bq Er EBADF
|
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The
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.Fa path
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|
argument does not specify an absolute path and the
|
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.Fa fd
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argument is neither
|
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|
.Dv AT_FDCWD
|
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|
nor a valid file descriptor open for searching.
|
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.It Bq Er EINVAL
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The value of the
|
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|
.Fa flag
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argument is not valid.
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.It Bq Er ENOTDIR
|
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The
|
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|
.Fa path
|
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|
argument is not an absolute path and
|
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.Fa fd
|
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|
is neither
|
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|
|
.Dv AT_FDCWD
|
|
|
|
nor a file descriptor associated with a directory.
|
2018-10-25 22:16:34 +00:00
|
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|
.It Bq Er ENOTCAPABLE
|
2018-11-11 01:46:48 +00:00
|
|
|
.Fa path
|
|
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|
is an absolute path,
|
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|
or contained a ".." component leading to a
|
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|
|
directory outside of the directory hierarchy specified by
|
|
|
|
.Fa fd ,
|
2021-02-16 03:31:40 +00:00
|
|
|
and the process is in capability mode or the
|
|
|
|
.Dv AT_RESOLVE_BENEATH
|
|
|
|
flag was specified.
|
2008-04-16 13:03:12 +00:00
|
|
|
.El
|
1994-05-27 05:00:24 +00:00
|
|
|
.Sh SEE ALSO
|
|
|
|
.Xr chgrp 1 ,
|
2006-12-09 22:41:26 +00:00
|
|
|
.Xr chflags 2 ,
|
1994-05-27 05:00:24 +00:00
|
|
|
.Xr chmod 2 ,
|
1997-01-20 23:23:22 +00:00
|
|
|
.Xr flock 2 ,
|
|
|
|
.Xr chown 8
|
1994-05-27 05:00:24 +00:00
|
|
|
.Sh STANDARDS
|
1996-12-02 20:03:58 +00:00
|
|
|
The
|
|
|
|
.Fn chown
|
2002-12-18 09:22:32 +00:00
|
|
|
system call is expected to conform to
|
1996-12-02 20:03:58 +00:00
|
|
|
.St -p1003.1-90 .
|
2008-04-16 13:03:12 +00:00
|
|
|
The
|
|
|
|
.Fn fchownat
|
|
|
|
system call follows The Open Group Extended API Set 2 specification.
|
1994-05-27 05:00:24 +00:00
|
|
|
.Sh HISTORY
|
2002-12-18 09:22:32 +00:00
|
|
|
The
|
1996-08-29 21:24:19 +00:00
|
|
|
.Fn chown
|
2002-12-18 09:22:32 +00:00
|
|
|
function appeared in
|
2017-12-01 22:26:36 +00:00
|
|
|
.At v1 .
|
1994-05-27 05:00:24 +00:00
|
|
|
The
|
|
|
|
.Fn fchown
|
2002-12-18 09:22:32 +00:00
|
|
|
system call appeared in
|
1994-05-27 05:00:24 +00:00
|
|
|
.Bx 4.2 .
|
|
|
|
.Pp
|
|
|
|
The
|
|
|
|
.Fn chown
|
2002-12-18 09:22:32 +00:00
|
|
|
system call was changed to follow symbolic links in
|
1994-05-27 05:00:24 +00:00
|
|
|
.Bx 4.4 .
|
1997-03-31 12:37:35 +00:00
|
|
|
The
|
|
|
|
.Fn lchown
|
2002-12-18 09:22:32 +00:00
|
|
|
system call was added in
|
1997-03-31 12:37:35 +00:00
|
|
|
.Fx 3.0
|
|
|
|
to compensate for the loss of functionality.
|
2008-04-16 13:03:12 +00:00
|
|
|
.Pp
|
|
|
|
The
|
|
|
|
.Fn fchownat
|
|
|
|
system call appeared in
|
|
|
|
.Fx 8.0 .
|