ACC Programmer's Reference Guide

114 Chapter3
ZCOM Tables and Data Structures
Message Header
SENODE - Node where event was generated
This field will contain the ZCOM node number of the system that
generated the event message. If the message type is
ZCOM_MSTYPE_LSEM, this will contain the local ZCOM node number.
SETIME - Time when the event o ccurred
This field contains the Coordinated Universal Time (UTC) of when the
event occurred. It is taken from the originating system at the time of the
event.
SEDATA - Event specific data
Immediately following the header is a union that contains information
specific to the type of event that occurred. There are currently two
different event types that can be generated. The data structure for each
is documented below.
ZCOM_SETYPE_NODE - Node status change event
The node status change event is generated whenever a node changes
state or the state of t he ZNODE daemon changes. The event data is
referenced using sedata.node.<field name> and has the following fields:
NODE_NUM - N ode numb er
This is the number of the node that has changed state. Note that this
node is different from the SENODE field. For example, in ZCOM node
10, two remote nodes 40 and 50 are defined. In node 10, if the system
detects that remote node 40 has gone down, the SEM generated will have
SENODE=10, SEDATA.NODE.NODE_NUM=40.
Table 3-41 Node Status Change Event Fields (ZCOM_SETYPE_NODE)
Field Name Field Description Field Type Size
(Bytes)
NODE_NUM Node Number uns.short 2
NSTAT Node status change indicator char 1
SPARE Reserved, not used char 1
HSTAT Host link status change indicator char [4] 4