net snmp agent invokes delayed handler multiple times for a single query

Hello,

I have implemented a mib module in which the handler sets the delegated flag
for an incoming snmp request to 1, sends the request using a socket to
another process and registers the read socket using register_readfd. The
response takes around 10 seconds to arrive, which is then handled by the
function registered in register_readfd. I have noticed that when a query for
a single object is made using snmpget or snmpgetnext, the handler is invoked
more then once (usually twice) and hence the remote process ends up serving
2 identical requests instead of one. What could be causing the handler to be
invoked more than once? The code in the handler is as follows:

typedef struct {
 int mode;
 char oidname[100];
 oid name[10];
 int value;
} server_struct;

int
delayed_instance_handler(netsnmp_mib_handler *handler,
                         netsnmp_handler_registration *reginfo,
                         netsnmp_agent_request_info *reqinfo,
                         netsnmp_request_info *requests)
{

 char* oidname = (char*)malloc(100);
 server_struct clst;
    DEBUGMSGTL(("delayed_instance", "Got request, mode = %d:\n",
                reqinfo->mode));

    switch (reqinfo->mode) {
    default:
        requests->delegated = 1;

    netsnmp_delegated_cache *cache = netsnmp_create_delegated_cache(handler,
                                                           reginfo,
                                                           reqinfo,
                                                           requests,
                                                           NULL);

   snprint_objid (oidname, 100, requests->requestvb->name,
requests->requestvb->name_length);
   clst.mode = reqinfo->mode;
   strcpy(clst.oidname, oidname);
    /* send data */
      rc = sendto(sd, &clst, sizeof(clst), 0,
    (struct sockaddr *) &remoteServAddr,
    sizeof(remoteServAddr));

   register_readfd(rd, funct, (void*)cache);
  }
     return SNMP_ERR_NOERROR;
}

Thanks,
Mayur.



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