Re: Persistent storage

Hi,

coming back to..
Dave Shield schrieb:
> On 04/09/07, Peter Czaja <[email protected]> wrote:
>> But where is the equivalent to the "init_myagent_scalar()" function?
>>
>> Something like "finalize_myagent_scalar()", which would be a natural
>> place to implement the corresponding calls to netscnmp_ds_write_*().
>>
>> What did I miss?
> 
> Add the following call to init_myagent_scalar():
> 
>         snmp_register_callback(SNMP_CALLBACK_LIBRARY,
>                            SNMP_CALLBACK_STORE_DATA,
>                            finalize_myagent_scalar, NULL);
> 
> That will save your persistent data - both when the agent shuts
> down, and also when it is explicitly told to save or re-read config
> files.

Thanks for your help.
Unfortunately my code doesn't get called on the agent's exit.

But calling the function finalize_myagent_scalar() using the
callback mechanism via

  snmp_call_callbacks( SNMP_CALLBACK_LIBRARY, SNMP_CALLBACK_STORE_DATA, NULL)

does work, after having it registered like you suggested.

The agent is a simple subagent generated using mib2c and communicating
with the master agent via agentx. It is sitting at the right place in
the agents/ directory, so the script "/etc/init.d/snmpd start"
successfully starts my subagent with snmpd. Getting and setting
values of my custom MIB works like a charm.

But that's not even my main concern, as storing data using the
default store mechanism doesn't work out like I expected, either:

In my init function, I registered a variable using

  netsnmp_ds_register_config( ASN_INTEGER, "myagent", "myvalue",
            NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_MYAGENT_MYVALUE)

and expect it to be stored on the agent's exit in the file
/var/net-snmp/myagent.conf in a line like

  myvalue=<whatever_int_i_stored>

and being retrieved on the agents start, being readily available to
be read, umm, via

  netsnmp_ds_get_int( NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_MYAGENT_MYVALUE)

But it keeps returning a value of 0 on a freshly started agent, instead of
the value I had stored previously using

  netsnmp_ds_set_int( NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_MYAGENT_MYVALUE, myvalue)

the last time before the agent was shut down.


Enlightenment is apprecciated :)


    Peter


-- 
   O=====                                                     __o
  /`-´                        Peter Czaja                   _`\<,_
  \/\_ ______ ___ __ _     Paderborn Germany    _ __ ______(_)/ (_)____

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