What is the best code estrategy to reptitively query a mib variable?

Hello net-snmp users and fellows,

I would like to get an opnion about a doubt.
Im coding in C/C++ and using single session API … well doesn’t matter to the core of my question…. just to inform.

I need each 30 seconds (as quickly the agent can do) to get a three distinct MIB scalar variable value,
always the same variables, doing this inside loop.

Considering the well know and usual sequence code to do this:

      sessionSingle = (void*) snmp_sess_open(session);
… error check …
      puSession_p = snmp_sess_session((session_list *) sessionSingle); 
… error check …

     puPDU = snmp_pdu_create(SNMP_MSG_GET);
While() {
    pdu = snmp_pdu_create(SNMP_MSG_GET);
    snmp_add_null_var(pdu, theoid_1, theoid_1_len);
    snmp_add_null_var(pdu, theoid_2, theoid_2_len);
    snmp_add_null_var(pdu, theoid_3, theoid_3_len);
...
    status = snmp_synch_response(ss, pdu, &response);
… Now read each variable in response
…
	 snmp_free_pdu(response);
}

We know that created pdu cannot be reused, otherwise it can be outside the loop.
also the response is not reusable to since snmp_synch_response  alloc a new one each time.

Taking these initial considerations,
trying to optimize the snmp_functions inside the loop I wrote:


puPDU = snmp_pdu_create(SNMP_MSG_GET);
While() {
    netsnmp_pdu * cloned_pdu = snmp_clone_pdu(pdu);

    snmp_add_null_var(cloned_pdu, theoid_1, theoid_1_len);
    snmp_add_null_var(cloned_pdu, theoid_2, theoid_2_len);
    snmp_add_null_var(cloned_pdu, theoid_3, theoid_3_len);
    ...
    status = snmp_synch_response(session, cloned_pdu, &response);
   … Now read each variable in response
	…
	 snmp_free_pdu(response);
}

Finally my two doubts as questions for who that had the same problem or wish
to propose/discuss some alternatives:

1- I’m really optimizing something avoiding successive snmp_pdu_create() calls inside with snmp_clone_pdu()?
2- What others/more changes optimizing same calls inside the loop can I do?

Any help or suggestions will be useful and surely appreciated!

Best regards for all!

JRFA




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