SNMP Subagent Programmer's Guide

Programming Tutorials

SNMP Subagent Programmer’s Guide—119728 2-33

Static Directory Program

This subagent illustrates how to make a tabular MIB object manageable. In this case the

table is static: that is, its entries do not change while the subagent is executing. Dealing

with static tables is simple for a subagent. All the subagent has to do is build the table

and register each of its rows using mgmt_new_instance(). Thereafter, the run-time

library can find entries whenever mgmt_poll() is called.

These files are related to Static Directory:

Functions

Invoke Static Directory by specifying the executable subagent name and a NonStop

agent process name:

RUN FIXEDLS /NAME $STAT/ $ZSNMP

Static Directory builds a table whose entries are the files that reside in the subvolume

named zsnmpsdk at the time it is invoked. Once the table is built, the subagent handles

requests from SNMP managers to read the table entries.

MIB

Example 2-5 shows the MIB definition used by Static Directory. The MIB defines the

following objects:

fixedlsc C source code

dirC C source code

dirH C source code

fxdlssmi MIB definition

fixedlsm TACL routine

dirName The subvolume name. The MIB extension encoded in the ACCESS clause

indicates that the MIB value is maintained in a field named dir_name of a

structure named “directory.”

dirFiles The table.

fileEntry A table entry. Each entry consists of a single object: fileName. The index

to a table entry consists of the value of its fileName.

fileNam

The name of a file in the subvolume. The MIB extension indicates that the

MIB value is maintained in a field named file_name of a structure named

file_entry. The value of this object serves as the index to each entry.