Distributed Name Service (DNS) Management Programming Manual

6 Event Messages
46958 Tandem Computers Incorporated 6–1
This section describes the contents and meaning of all event messages generated by
DNS. DNS event messages include some tokens and values defined by SPI (ZSPI),
EMS (ZEMS), and DNS (ZDNS).
The overall goal of DNS event reporting is to allow system operators to monitor and
control the execution of the DNS subsystem.
In this section, command numbers, object types, and all tokens and their values are
represented in DDL. For a quick explanation of DDL, refer to the appendix “Overview
of DDL for SPI” in the Distributed Systems Management (DSM) Programming Manual.
Subsystem Processes
That Report Events
Within the DNS subsystem, the DNS name manager, the name exporter, and
DNSCOM generate event messages. The token ZDNS-TKN-GENERATOR, present in
all DNS event messages, may be used to quickly determine which process generated a
particular event message. All event messages generated by these processes contain the
DNS subsystem ID, which is described under “SPI Standard Definitions” in Section 4.
Table 6-1 lists the event messages defined by DNS.
DNS generates event messages under the following circumstances:
DNS is initialized (or reinitialized) on a system.
A change of state occurs in one of the DNS named processes (manager or
exporter), either expected or unexpected.
A significant unexpected error is detected.
DNS does not generate event messages when a name is added to, deleted from, or
changed in the DNS database.