pTAL Reference Manual (H06.03+)

Glossary
HP pTAL Reference Manual—523746-005
Glossary-5
EXTDECS
EXTDECS. A file, provided by the operating system, that contains external declarations for
system procedures. System procedures, for example, manage files, activate and
terminate programs, and monitor the operations of processes.
extended addressing. Data access through an extended (32-bit) pointer. Compare to direct
addressing.
extended data segment. See selectable segment.
extended pointer. A 32-bit simple pointer or structure pointer. An extended pointer can
contain a 32-bit byte address of any location in virtual memory.
EXTENSIBLE procedure. A procedure that you declare using the EXTENSIBLE keyword; a
procedure to which you can add formal parameters without recompiling its callers; a
procedure for which the compiler considers all parameters to be optional, even if some
are required by your program. Compare to VARIABLE procedure.
EXTERNAL procedure declaration. A procedure declaration that includes the EXTERNAL
keyword and no procedure body; a declaration that enables you to call a procedure
that is declared in another source file.
file identifier. In the Guardian environment, the portion of a filename following the
subvolume name. In the Open System Services (OSS) environment, a file identifier is a
portion of the internal information used to identify a file in the OSS file system (an node
number). The two identifiers are not comparable.
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.
fileset. In the Open System Services (OSS) environment, a set of files with a common
mount point within the file hierarchy. A fileset can be part or all of a single virtual file
system.
On an HP NonStop™ system, the Guardian file system for an Expand node has a
mount point and is a subset of the OSS virtual file system. The entire Guardian file
system therefore could be viewed as a single fileset. However, each volume and each
process of subtype 30 within the Guardian file system is actually a separate fileset.
The term file system is often used interchangeably with fileset in UNIX publications.