Detecting access of a particular OID, handler functions

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When we create an MIB and load it, say by agentx support then is there any
way to find out when any OID created by us is being accessed and also to
dynamically change the value of that OID depending on some condition. The
example at net-snmp site says that while registering the instance you can
specify a valid handler function instead of NULL.
netsnmp_register_int_instance("nstAgentSubagentObj ect",
nstAgentSubagentObject_oid,
OID_LENGTH(nstAgentSubagentObject_oid),
&nstAgentSubagentObject, NULL);
What i cannot understand is that how do we declare this handler function,
how is it called and what are the tasks it is supposed to perform. Does the
handler function get called whenever somebody queries for that OID.

regards
Devvrat

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When we create an MIB and load it, say by agentx support then is there any way to find out when any OID created by  us is being accessed and also to dynamically change the value of that OID depending on some condition. The example at net-snmp site says that while registering the instance you can specify a valid handler function instead of NULL.
<br>netsnmp_register_int_instance(&quot;nstAgentSu bagentObject&quot;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nb sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;& nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb sp;&nbsp;&nbsp;&nbsp; nstAgentSubagentObject_oid,<br>&nbsp;&nbsp;&nbsp;& nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;& nbsp;&nbsp;&nbsp;&nbsp;&nbsp; OID_LENGTH(nstAgentSubagentObject_oid),<br>&nbsp;& nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;& nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &amp;nstAgentSubagentObject, NULL);
<br>What i cannot understand is that how do we declare this handler function, how is it called and what are the tasks it is supposed to perform. Does the handler function get called whenever somebody queries for that OID.
<br><br>regards<br>Devvrat<br>

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