2005-05-02 15:01:42 +02:00
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.\" Copyright (c) 1980 Regents of the University of California.
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.\" All rights reserved. The Berkeley software License Agreement
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.\" specifies the terms and conditions for redistribution.
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.\"
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.\" @(#)chown.2 6.6 (Berkeley) 5/22/86
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.\"
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.TH CHOWN 2 "May 22, 1986"
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.UC 4
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.SH NAME
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2006-04-18 13:26:04 +02:00
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chown, fchown \- change owner and group of a file
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2005-05-02 15:01:42 +02:00
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.SH SYNOPSIS
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.nf
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.ft B
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int chown(const char *\fIpath\fP, int \fIowner\fP, int \fIgroup\fP)
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.ig \" You never know
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.PP
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.ft B
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int fchown(int \fIfd\fP, int \fIowner\fP, int \fIgroup\fP)
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..
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.fi
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.SH DESCRIPTION
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The file
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that is named by \fIpath\fP
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.ig
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or referenced by \fIfd\fP
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..
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has its
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.I owner
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and
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.I group
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changed as specified.
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Only the super-user
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may change the owner of the file,
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because if users were able to give files away,
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they could defeat file-space accounting procedures.
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The owner of the file may change the group
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to a group of which he is a member.
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.PP
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On some systems,
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.I chown
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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 creation of
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set-user-id and set-group-id programs.
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.SH "RETURN VALUE
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Zero is returned if the operation was successful;
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\-1 is returned if an error occurs, with a more specific
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error code being placed in the global variable \fBerrno\fP.
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.SH "ERRORS
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.B Chown
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will fail and the file will be unchanged if:
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.TP 15
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[ENOTDIR]
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A component of the path prefix is not a directory.
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.TP 15
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[ENAMETOOLONG]
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The path name exceeds PATH_MAX characters.
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.TP 15
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[ENOENT]
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The named file does not exist.
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.TP 15
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[EACCES]
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Search permission is denied for a component of the path prefix.
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.TP 15
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[ELOOP]
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Too many symbolic links were encountered in translating the pathname.
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.TP 15
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[EPERM]
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The effective user ID is not the super-user.
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.TP 15
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[EROFS]
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The named file resides on a read-only file system.
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.TP 15
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[EFAULT]
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.I Path
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points outside the process's allocated address space.
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.TP 15
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[EIO]
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An I/O error occurred while reading from or writing to the file system.
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.ig
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.PP
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.B Fchown
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will fail if:
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.TP 15
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[EBADF]
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.I Fd
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does not refer to a valid descriptor.
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.TP 15
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[EPERM]
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The effective user ID is not the super-user.
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.TP 15
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[EROFS]
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The named file resides on a read-only file system.
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.TP 15
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[EIO]
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An I/O error occurred while reading from or writing to the file system.
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..
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.SH "SEE ALSO"
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.BR chown (8),
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.BR chgrp (1),
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.BR chmod (2).
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