NonStop S-Series System Expansion and Reduction Guide

Glossary
G-Series Common Glossary
Glossary-89
searchList
searchList. For each loadfile, a list that is constructed and used by the linker and loader to
tell them which libraries to examine, and in which order, to locate symbol definitions
needed by that loadfile. The linker and loader construct the loadfile’s searchList in
accordance with that loadfile’s import control, which is set at link time by the loadfile’s
programmer. A loadfile’s searchList is unaffected by the import control of any other
loadfile.
SEB. See ServerNet expansion board (SEB).
SEB port. A connector on ServerNet expansion boards (SEBs) used for ServerNet links. An
SEB has six emitter-coupled logic (ECL)-based ServerNet ports. See also MSEB port
.
Security Manager Process (SMP). A component of the Safeguard subsystem that
manages all changes to the subject and object databases and authenticates user
logon attempts.
segment. In general, a contiguous sequence of logically related pages of virtual memory.
The pages of the segment are individually swapped in and out of physical memory as
needed. Within a loadable object file, one of the portions of the file that is mapped as
one unit into virtual memory as the file is loaded. See also code segment
and data
segment.
selectable segment. A type of logical segment formerly known as an extended data
segment. The data area for a selectable segment always begins with relative segment
4, and this area can be dynamically switched among several selectable segments by
calls to the Guardian SEGMENT_USE_ procedure. The effect is similar to a rapid
overlaying of one large data area. See also logical segment
and flat segment.
SEM. See ServerNet extender module (SEM).
semaphore. A mechanism used to provide multiple processes with access to a shared data
object.
semi-globalized. An import control characteristic of a loadfile that allows the loadfile first to
obtain symbols from its own definitions and then to obtain others as for a globalized
loadfile. See also searchList
.
sensitive command. A Subsystem Control Facility (SCF) command that can be issued only
by a user with super-group access, by the owner of the subsystem, or by a member of
the group of the owner of the subsystem. The owner of a subsystem is the user who
started that subsystem (or any user whose application ID is the same as the server
ID—the result of a PROGID option that requires super-group access). Contrast with
nonsensitive command
.
separately derived power source. A facility wiring system where power is derived from a
generator, transformer, or converter windings and there is no direct electrical
connection, including a solidly connected grounded circuit conductor (neutral), to
supply conductors originating in other facility wiring systems. Types of separately