ACC Programmer's Reference Guide

54 Chapter3

ZCOM Tables and Data Structures

Node Entries Table

TheNodeEntriestablecontainsinformationabouttheremoteZCOM

systems that communicate with the local ZCOM subsystem. Each

Local-Node and Remote-Node definition in the TTGEN configuration file

occupy one entry in the table. Each entry structure is 392 bytes long and

has the format shown in Ta ble 3-4.

NODE_NUM - N ode numb er

This field contains a unique node number that identifies the entry.

TIMEOUT - Default timeout value for this node

This field contains timeout in seconds for requests sent to this remote

node. Most remote ZCOM requests (e.g. ZOPEN, ZTIMR,etc)requirea

definite response from the remote ZCOM subsystem. If the response is

not received within the timeout period specified by this field, error

ZENTOUT (-23) is returned to the application program. This field is

initialized by TTGEN with the timeout value specified in a Remote-Node

definition. This field is zero for a local node entry.

Table 3-4 Node Entries Table

Field Name Field Description Field Type Size

(Bytes)

node_num ZCOM system node number uns.short 2

timeout Default timeout value for this node uns.short 2

flags Node status and internal flags uns.int 4

stats Statistics for this node struct 16

ndshzrvrs List of node status event receivers pointer 8

nhost Number of hosts in the host array uns.short 2

spare1 Reserved, not used uns.short 2

spare2 Reserved, not used int 4

host Host link information struct [4] 4*88