8ddda52485
does not return a list of ASCII NUL terminated strings. Instead, a list of attribute names is returned, where each list entry consists of one byte for the name length, followed by the name, without a terminating ASCII NUL. This in similar to change 1.17 to extattr_get_file.2 Reviewed by: rwatson, ru
137 lines
4.2 KiB
Groff
137 lines
4.2 KiB
Groff
.\"-
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.\" Copyright (c) 2003 Network Associates Technology, Inc.
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.\" All rights reserved.
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.\"
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.\" This software was developed for the FreeBSD Project in part by Network
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.\" Associates Laboratories, the Security Research Division of Network
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.\" Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
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.\" as part of the DARPA CHATS research program.
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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 August 19, 2005
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.Os
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.Dt VOP_LISTEXTATTR 9
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.Sh NAME
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.Nm VOP_LISTEXTATTR
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.Nd retrieve a list of named extended attribute from a vnode
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/vnode.h
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.In sys/extattr.h
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.Ft int
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.Fo VOP_LISTEXTATTR
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.Fa "struct vnode *vp"
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.Fa "int attrnamespace"
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.Fa "struct uio *uio"
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.Fa "size_t *size"
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.Fa "struct ucred *cred"
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.Fa "struct thread *td"
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.Fc
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.Sh DESCRIPTION
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This vnode call may be used to retrieve a list of named extended attributes
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from a specified namespace on a file or directory.
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.Pp
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Its arguments are:
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.Bl -tag -width ".Fa attrnamespace"
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.It Fa vp
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The vnode of the file or directory.
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.It Fa attrnamespace
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Integer constant indicating which extended attribute namespace the attribute
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name is present in.
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.It Fa uio
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The location of the data to be read.
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The resulting data will be a list of attribute names.
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Each list entry consists of a single byte containing the length of
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the attribute name, followed by the attribute name.
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The attribute name is not terminated by
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.Tn ASCII
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.Dv NUL .
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.It Fa size
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If not
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.Dv NULL ,
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on return it will contain the number of bytes required to read the list.
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In most cases
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.Fa uio
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will be
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.Dv NULL
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when
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.Fa size
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is not, and vise versa.
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.It Fa cred
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The user credentials to use in authorizing the request.
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.It Fa td
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The thread requesting the extended attribute.
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.El
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.Pp
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The
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.Fa cred
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pointer may be
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.Dv NULL
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to indicate that access control checks are not to be performed, if possible.
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This
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.Fa cred
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setting might be used to allow the kernel to authorize extended attribute
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retrieval that the active process might not be permitted to do.
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.Pp
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Extended attribute semantics may vary by file system implementing the call.
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More information on extended attributes may be found in
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.Xr extattr 9 .
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.Sh LOCKS
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The vnode will be locked on entry and should remain locked on return.
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.Sh RETURN VALUES
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On success, zero will be returned, and the
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.Fa uio
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structure will be updated to
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reflect the list read.
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Otherwise, an appropriate error code is returned.
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er EACCES
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The caller does not have the appropriate privilege.
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.It Bq Er ENXIO
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The request was not valid in this file system for the specified vnode and
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attribute name.
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.It Bq Er ENOMEM
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Sufficient memory is not available to fulfill the request.
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.It Bq Er EFAULT
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The
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.Fa uio
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structure refers to an invalid userspace address.
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.It Bq Er EINVAL
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The
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.Fa namespace
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or
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.Fa uio
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argument is invalid.
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.It Bq Er EOPNOTSUPP
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The file system does not support
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.Fn VOP_LISTEXTATTR .
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.El
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.Sh SEE ALSO
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.Xr extattr 9 ,
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.Xr vnode 9 ,
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.Xr VOP_GETEXTATTR 9 ,
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.Xr VOP_SETEXTATTR 9
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