EPTRACE Manual

Glossary
EPTRACE Manual—528811-002
Glossary-4
filename
filename. In the Open System Services (OSS) environment, a component of a pathname
containing any valid characters other than slash (/) or null. See also file name.
file name. A string of characters that uniquely identifies a file.
In the PC environment, file names for disk files normally have at least two parts (the
disk name and the file name); for example, B:MYFILE.
In the Guardian environment, disk file names include an Expand node name, volume
name, subvolume name, and file identifier; for example,
\NODE.$DISK.SUBVOL.MYFILE.
In the Open System Services (OSS) environment, a file is identified by a pathname; for
example, /usr/john/workfile. See also filename.
file system. In the Open System Services (OSS) environment, a collection of files and file
attributes. A file system provides the namespace for the file serial numbers that
uniquely identify its files. Open System Services provides a file system (see also
ISO/IEC IS 9945-1:1990 [ANSI/IEEE Std. 1003.1-1990], Clause 2.2.2.38); the
Guardian application program interface (API) provides a file system; and OSS Network
File System (NFS) provides a file system. (OSS NFS filenames and pathnames are
governed by slightly different rules than OSS filenames and pathnames.) Within the
OSS and OSS NFS file systems, filesets exist as manageable objects.
On an HP NonStop™ system, the Guardian file system for an Expand node is a subset
of the OSS virtual file system. Traditionally, the API for file access in the Guardian
environment is referred to as the Guardian file system.
In some UNIX and NFS implementations, the term file system means the same thing
as fileset. That is, a file system is a logical grouping of files that, except for the root of
the file system, can be contained only by directories within the file system. See also file
system.
flat segment. A type of logical segment. Each flat segment has its own distinct address
range within the process address space that never overlaps the range of any other
allocated segments. Thus all allocated flat segments for a process are always available
for use concurrently. See also logical segment and selectable segment.
group list. An Open System Services (OSS) process attribute that is used with the effective
group ID of the process to determine the file access permissions for the process.
Guardian. An environment available for interactive or programmatic use with the HP
NonStop™ operating system. Processes that run in the Guardian environment usually
use the Guardian system procedure calls as their application program interface.
Interactive users of the Guardian environment usually use the HP Tandem Advanced
Command Language (TACL) or another HP product’s command interpreter. Contrast
with Open System Services (OSS).
Guardian environment. The Guardian application program interface (API), tools, and
utilities.