101 lines
3.4 KiB
Groff
101 lines
3.4 KiB
Groff
.\"
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.\" Copyright (c) 2001 Dima Dorfman <dd@FreeBSD.org>
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.\" 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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.Dd June 24, 2001
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.Dt EXTATTR 3
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.Os
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.Sh NAME
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.Nm extattr_namespace_to_string ,
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.Nm extattr_string_to_namespace
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.Nd convert an extended attribute namespace identifier to a string and
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vice versa
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.Sh LIBRARY
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.Lb libutil
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.Sh SYNOPSIS
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.Fd #include <sys/extattr.h>
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.Fd #include <libutil.h>
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.Ft int
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.Fn extattr_namespace_to_string "int attrnamespace" "char **string"
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.Ft int
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.Fn extattr_string_to_namespace "const char *string" "int *attrnamespace"
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.Sh DESCRIPTION
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The
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.Fn extattr_namespace_to_string
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function converts a VFS extended attribute identifier to a human-readable
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string;
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the
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.Fn extattr_string_to_namespace
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function undoes the aforementioned operation,
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and converts a human-readable string representing a namespace to a
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namespace identifier.
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Although a filesystem may implement arbitrary namespaces,
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these functions only support the
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.Dv EXTATTR_NAMESPACE_USER
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.Pq Dq user
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and
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.Dv EXTATTR_NAMESPACE_SYSTEM
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.Pq Dq system
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namespaces,
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which are defined in
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.Xr extattr 9 .
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.Pp
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These functions are meant to be used in error reporting and other
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interactive tasks.
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For example,
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instead of printing the integer identifying an extended attribute in
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an error message,
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a program might use
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.Fn extattr_namespace_to_string
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to obtain a human-readable representation.
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Likewise,
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instead of requiring a user to enter the integer representing a namespace,
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an interactive program might ask for a name and use
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.Fn extattr_string_to_namespace
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to get the desired identifier.
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.Sh RETURN VALUES
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If any of the calls are unsuccessful, the value \-1 is returned
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and the global variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The requested namespace could not be identified.
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.El
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.Sh SEE ALSO
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.Xr extattr 2 ,
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.Xr getextattr 8 ,
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.Xr setextattr 8 ,
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.Xr extattr 9
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.Sh HISTORY
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Extended attribute support was developed as part of the
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.Tn TrustedBSD
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Project, and introduced in
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.Fx 5.0 .
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It was developed to support security extensions requiring additional labels
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to be associated with each file or directory.
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