Telserv Manual

Subsystem Control Facility (SCF) for Telserv
Telserv Manual—427174-009
4-5
States
the subordinate objects are affected. ALL specifies that the named object and the
subordinate objects are affected. If subtype is omitted, ALL is assumed.
States
Objects can have operational states, such as STOPPED or STARTED. The exact
sequence of states an object goes through varies from object to object and from
subsystem to subsystem. SCF commands for the Telserv subsystem recognize only
two states: STOPPED and STARTED. Applicable states for Telserv are discussed
below.
The operational state of an object at a given instant is important. For example, some
commands have no effect on objects when those objects are in the STOPPED state,
but can affect the object when it is in the STARTED state.
The following states are recognized by the Telserv subsystem:
How SCF Works
For commands that relate only to the SCF session (such as VOLUME), SCF takes the
appropriate action without communicating with SCP. For commands that relate to a
subsystem or its objects, SCF translates the command into a formatted message for
SCP, which then communicates with the appropriate subsystem to perform the
specified task.
SCF accepts commands from a terminal, a disk file, or an application process. It sends
display output to a terminal, a file, a process, or a printer. When SCF is started
interactively, the input source and output destination are specified in the command-
interpreter RUN command used to start SCF. If SCF is started by a process-creation
procedure, its input source and output destination are taken from the startup message.
Subsequent SCF commands can change the input source and output destination.
Input Sources
SCF accepts command input from a terminal or a disk file. The initial input source is
determined by the form of the RUN command used to initiate SCF. At any time during
an SCF session, the input source can be temporarily changed to execute a series of
commands from a command (Obey) file.
State Description
STOPPED The object is not ready for normal operations. STOPPED is equivalent to
down, not ready, or killed.
STARTED The object is initialized and ready for normal data traffic.