extattr.9 revision 68753
-
Copyright (c) 1999 Robert N. M. Watson
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
$FreeBSD: head/share/man/man9/extattr.9 68753 2000-11-15 16:00:07Z ben $
.Dd December 23, 1999 .Os .Dt EXTATTR 9 .Sh NAME .Nm extattr .Nd virtual file system named extended attributes .Sh SYNOPSIS .Fd #include <sys/param.h> .Fd #include <sys/vnode.h> .Fd #include <sys/extattr.h> .Sh DESCRIPTION Named extended attributes allow additional meta-data to be associated with vnodes representing files and directories. The semantics of this additional data is that of a "name=value" pair, where a name may be defined or undefined, and if defined, associated with zero or more bytes of arbitrary binary data. Reads of this data may return specific contiguous regions of the meta-data, in the style of .Xr VOP_READ 9 , but writes will replace the entire current "value" associated with a given name. As there are a plethora of file systems with differing extended attributes, availability and functionality of these functions may be limited, and they should be used with awareness of the underlying semantics of the supporting file system. Authorization schemes for extended attribute data may also vary by file system, as well as maximum attribute size, and whether or not any or specific new attributes may be defined. Extended attributes are named using a null-terminated character string. Depending on file system semantics, this name may or may not be case-sensitive. Appropriate vnode extended attribute calls are: .Xr VOP_GETEXTATTR 9 and .Xr VOP_SETEXTATTR 9 . .Sh SEE ALSO .Xr VFS 9 , .Xr VOP_GETEXTATTR 9 , .Xr VOP_SETEXTATTR 9 .Sh AUTHORS This man page was written by .An Robert Watson .
Copyright (c) 1999 Robert N. M. Watson
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
$FreeBSD: head/share/man/man9/extattr.9 68753 2000-11-15 16:00:07Z ben $
.Dd December 23, 1999 .Os .Dt EXTATTR 9 .Sh NAME .Nm extattr .Nd virtual file system named extended attributes .Sh SYNOPSIS .Fd #include <sys/param.h> .Fd #include <sys/vnode.h> .Fd #include <sys/extattr.h> .Sh DESCRIPTION Named extended attributes allow additional meta-data to be associated with vnodes representing files and directories. The semantics of this additional data is that of a "name=value" pair, where a name may be defined or undefined, and if defined, associated with zero or more bytes of arbitrary binary data. Reads of this data may return specific contiguous regions of the meta-data, in the style of .Xr VOP_READ 9 , but writes will replace the entire current "value" associated with a given name. As there are a plethora of file systems with differing extended attributes, availability and functionality of these functions may be limited, and they should be used with awareness of the underlying semantics of the supporting file system. Authorization schemes for extended attribute data may also vary by file system, as well as maximum attribute size, and whether or not any or specific new attributes may be defined. Extended attributes are named using a null-terminated character string. Depending on file system semantics, this name may or may not be case-sensitive. Appropriate vnode extended attribute calls are: .Xr VOP_GETEXTATTR 9 and .Xr VOP_SETEXTATTR 9 . .Sh SEE ALSO .Xr VFS 9 , .Xr VOP_GETEXTATTR 9 , .Xr VOP_SETEXTATTR 9 .Sh AUTHORS This man page was written by .An Robert Watson .