Re: Flow of Disman Event

On 27/07/06, [email protected]
<[email protected]> wrote:
>    Iam trying to understand how the disman/event module sends notifications
> to manager  without completely starting the agent process.
>
>    i.e I get a disman event notifications first at the manager before the
> coldstart trap of the net-snmp master agent.

That's because sending the coldStart trap is pretty much the last
thing that the agent does before settling down to answer incoming
requests.  From agent/snmpd.c:main():

    SOCK_STARTUP;
    init_agent(app_name);        /* do what we need to do first. */
    init_mib_modules();
    init_snmp(app_name);
    snmp_store(app_name);
    send_easy_trap(0, 0);
        receive();     /* 'infinite' loop */


Setting up a monitor entry is handled in
agent/mibgroup/disman/event/mteTriggerConf.c
In particular, parse_mteMonitor() sets up the entry, and finished with the call:

    snmp_register_callback(SNMP_CALLBACK_LIBRARY,
                           SNMP_CALLBACK_POST_READ_CONFIG,
                           _mteTrigger_callback_enable, entry );

This is triggered by the 'init_snmp' call above, and invokes mteTrigger_enable()
(in mteTrigger.c), which calls mteTrigger_run(), which invokes an
internal query to retrieve the necessary information, and decide
whether to send a notification.

By this point, the agent is basically fully set up and ready to go -
it just hasn't entered the main receive loop (or sent the coldStart
trap).


>    Does anyone have an understanding of the flow how exactly disman sends
> notifications before the master

Does that answer your question?

Dave

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