Re: Flow of Disman Event

On 27/07/06, rajasekhar.tellidevulapalli@wipro.com
<rajasekhar.tellidevulapalli@wipro.com> 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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