Hi all,
I am currently using net-snmp V5.5 (CentOS 6.2, 32 bit).
I have programmed (in C++) a tool to
- provide data interface as SNMP AgentX (boost thread), by calling
agent_check_and_process(1)
- listen to broadcast message on specific UDP port (boost io, boost thread)
I am running the tool as linux daemon.
Sometimes I've got a problem that at startup my tool does not receive the UDP
broadcast messages (this seems to be only a startup problem).
If I disable the SNMP AgentX checking (do not call agent_check_and_process),
everything is working all right and I receive the UDP broadcast message all
the time.
I discovered that, if I first start the snmp AgentX thread before initializing
and starting the UDP broadcast listener thread, the problem occurs frequently
(e.g. 5 of 10 times). If I first initialize and start the UDP broadcast
listener thread, the problem occurs less (but it occurs).
What can I do to overcome this problem?
Is there a configuration option or startup handling?
My SNMP AgentX configuration is (copied from NET-SNMP examples) shown below.
Thanks in advance and best regards,
Georg
--------------------------
SnmpAgentX::SnmpAgentX()
{
int agentx_subagent=1;
int background = 0;
int syslog = 0;
if (syslog)
snmp_enable_calllog();
else
snmp_enable_stderrlog();
if (agentx_subagent) {
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_ROLE, 1);
}
if (background && netsnmp_daemonize(1, !syslog))
exit(1);
// SOCK_STARTUP; -> done in main()
init_agent("SnmpAgentX");
mib_handler_.MibHandlerInit();
if (!agentx_subagent) {
init_vacm_vars();
init_usmUser();
}
init_snmp("SnmpAgentX");
if (!agentx_subagent)
init_master_agent();
is_thread_running_ = true;
thread_ = boost::shared_ptr<boost::thread> (new
boost::thread(boost::bind(&SnmpAgentX::Thread, this)));
}
void SnmpAgentX::Thread()
{
while (is_thread_running_)
{
agent_check_and_process(1); // block to avoid risk of
data loss
and reduce cpu occupation
}
}
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