Object Code Accelerator Manual

Glossary
Object Code Accelerator Manual—528144-003
Glossary-30
trap
trap. A software mechanism that stops program execution and holds the cause of a
processing problem. In TNS and accelerated execution modes, traps occur as the
result of errors that are not related to input or output. Contrast with signal.
trap handler. A location in a program where execution begins if a trap occurs. A process
can specify a trap handler by a call to the Guardian ARMTRAP procedure.
two-way communication. A form of interprocess communication in which the sender of a
message (requester process) expects data in the reply from the receiver (server
process). Contrast with one-way communication.
UID. A nonnegative integer that uniquely identifies a user within a node.
In the Open System Services (OSS) environment, the UID is the scalar view of the HP
NonStop™ operating system user ID. The UID is used in the OSS environment for
functions normally associated with a UNIX user ID.
unnamed process. A process to which a process name was not assigned when the
process was created. Contrast with named process.
unstructured file. A disk file that has no structure known to the disk process. Contrast with
structured file.
user code. A logically distinct part of the HP NonStop™ operating system that consists of
the code for user processes.
user database. A database within an HP NonStop™ node that contains the user name,
user ID, group ID, initial working directory, and initial user program for each user of the
node.
user data stack. The first 64K bytes in the user data segment in a TNS process. It is the
only 16-bit byte-addressable area. It is the primary area for static and dynamic data as
well as for saving procedure call and return information.
user ID. The unique identification of a user within a node.
In the Guardian environment, the term user ID usually means the structured view of the
HP NonStop™ operating system user ID. In the Open System Services (OSS)
environment, the term user ID usually means the scalar view of the HP NonStop™
operating system user ID—a number called the UID.
User Library (UL). See TNS code space.
user library. (1) An object code file that the operating system links to a program file at run
time. A program can have only one user library. See also TNS user library and TNS/E
native user library.
user name. A string that uniquely identifies a user within the user database for a node.