Telserv Manual

Subsystem Control Facility (SCF) for Telserv

Telserv Manual—427174-009

4-4

Sensitive and Nonsensitive Commands

Because some commands can have detrimental effects if improperly used, special

qualification is required to use them. These commands are called sensitive commands.

A sensitive command is one that can be issued only by a user with super-group

access, the owner of the subsystem, or a member of the same group as the owner of

the subsystem. When used in conjunction with the security features of the NonStop

Kernel operating system, SCF provides effective access control for sensitive

commands. Commands that request information or status but do not affect operation

are called nonsensitive commands. Nonsensitive commands are available to all users.

Objects

SCF controls a wide variety of data communications subsystems whose individual

components are called objects. Each object has an object type and an object name.

The object type describes the type of the object, such as LINE, SU (subdevice), or

PROCESS. The object name uniquely identifies an object within the system.

Object names usually follow a consistent set of naming conventions. Objects defined

during system generation are usually referred to by their device names, which consist

of a dollar sign ($) followed by a letter and from zero through six alphanumeric

characters. A LINE object, for example, might have the name $LIN32. A PROCESS

object sometimes has the same name as the line it controls.

Subdevices are often not defined during system generation and must be added to the

subsystem by using the SCF ADD command. The object name for an SU object

usually has two parts: the name of the line to which the SU has been added and the

unique name of the subdevice itself. The subdevice part of the name begins with a

pound sign (#) and includes up to seven alphanumeric characters. For example, an SU

object might have the name $LIN32.#PC, where $LIN32 is the name of the line.

There are many other object types and object names used in SCF. The objects

relevant to Telserv are described later in this section.

Subordinate Objects

Some subsystems are structured hierarchically, with a group of objects of one type

logically subordinate to objects of another type. For example, a number of subdevices

could be configured on a single line. In this case, an object specification (object-

spec) of the form line-name* (as in $LINE*) can be used to refer to all subdevices

on that line. Some SCF commands include a SUB parameter that refers to all

subordinate objects.

The SUB parameter has the following form:

SUB [ subtype ]

This parameter selects the subordinate objects affected by the command. subtype

can be a subordinate object type or one of the keywords ONLY or ALL. If a subordinate

object type is named, only objects of that type are affected. ONLY specifies that only