proplist(4)proplist(4)NAMEproplist - The storing, parsing, and retrieving of Extended File
Tru64 UNIX supports the storing, parsing, and retrieving of Extended
File Attributes. An Extended File Attribute is a name and value pair
that is contained in a variable-sized structure called a Property List.
A Property List is part of a file's metadata and can contain abstract
name and value pairs (Extended File Attributes) that can be set either
by the operating system (for example, ACLs and privileges) or by a
user-level application (for example, PC File Attributes).
Since Extended File Attributes are treated as an extension to a file's
metadata, they are synchronously updated, thereby ensuring consistency.
Note that Extended File Attributes set by user-level applications are
treated as opaque and can be virtually anything.
To ensure that all Property List names are unique, you must register
your Property List names with Compaq. Those Property List names with a
prefix are reserved by Compaq. In the case of conflicts, Compaq
reserves the right to arbitrate the naming conventions of Property
To register a Property List name, send a request by network mail to or
Tru64 UNIX File System Group
ATTN: Property List Administrator
Compaq Computer Corporation
110 Spit Brook Road
Nashua, NH. 03062-2698
Several user-level routines, listed in the Related Information section,
work together to manipulate Extended File Attributes. For example: To
set attributes, you use the sizeof_proplist_entry(3) and add_pro‐
plist_entry(3) routines to initialize the Extended File Attribute buf‐
fer passed to setproplist(3) or fsetproplist(3). To fetch attributes,
you use getproplist(3) or fgetproplist(3). To parse the attribute buf‐
fer returned by setproplist(3) or fsetproplist(3), use the get_pro‐
The format of the Extended File Attributes buffer, the values of the
system-wide properties, and the format of the Property List structures
are all defined in sys/proplist.h.
Extended File Attributes are supported by the Advanced File System
(AdvFS), the UNIX File System (UFS), and the Network File System (NFS).
The latter through the use of the proplistd daemon and the mount -o
The archive utilities and support files with Extended File Attributes.
However, third-party archive utilities may not support Extended File
Attributes and, consequently, if they are used on files with Extended
File Attributes, the Extended File Attributes will be lost.
Functions: add_proplist_entry(3), delproplist(3), fdelproplist(3),
fgetproplist(3), fsetproplist(3), get_proplist_entry(3), getpro‐
plist(3), setproplist(3), sizeof_proplist_entry(3).
Files: libproplist.a, libproplist.so, sys/proplist.h, acl(4).
Daemons: proplistd(8). delim off