Hi, all,
I need to implement the following scenario: Assume AgentX master/subagent are running happily. Now: 1. Master goes down; 2. Subagent successfully detects master went down (using some kind of propritory IPC heartbeat messaging); 3. Now master comes up, and the subagent now is informed that master is up (using again propritory IPC messaging); 4. The question is: what to do in subagent to cause re-register of all its MIBs with master?
I tried snmp_shutdown(), then trying to start SNMP again, but I got the following segmentation fault (at the end of this email). I am using ver 5.0.8.
I use register_mib_range in sugagent. I also tried to unregister_mib_range, then call register_mib_range again. I got segmentation fault again.
Then I noticed lots of the discussions on "Deregistration of a MIB", but it mainly talks an API to unregister handler. I do not register any handler.
To solve my problem, the ideal case is an API to cause subagent to re-register all existing MIB with master agent. Is there such an API (or a set of APIs)? If not, does any of the latest version support register_mib_range AND unregister_mib_range correctly?
Does agentxPingInterval help here? Thanks for your help. -Richard
(gdb) where
#0 __pthread_mutex_lock (mutex=0x0) at mutex.c:99
#1 0x0fcada90 in __libc_free (mem=0x10051e48) at malloc.c:3154
#2 0x0ffa3634 in netsnmp_handler_registration_free (reginfo=0x10092190)
at ../../../net-snmp/agent/agent_handler.c:444
#3 0x0ff9de50 in netsnmp_subtree_free (a=0x100551b0)
at ../../../net-snmp/agent/agent_registry.c:83
#4 0x0ff9ed4c in netsnmp_register_mib (moduleName=0x10053c60 "\017Ö\231 \017Ö\231 next",
var=0x0, varsize=4294967295, numvars=0, mibloc=0x7ffffa18, mibloclen=1, priority=0,
range_subid=0, range_ubound=0, ss=0xfcada90, context=0x0, timeout=0, flags=0,
reginfo=0x10092190, perform_callback=264952464)
at ../../../net-snmp/agent/agent_registry.c:619
#5 0x0ffa306c in netsnmp_register_handler (reginfo=0x10092190)
at ../../../net-snmp/agent/agent_handler.c:163
#6 0x0ff2b208 in netsnmp_register_null (loc=0x7ffffa18, loc_len=1)
at ../../../../net-snmp/agent/helpers/null.c:28
#7 0x0ffa00a4 in setup_tree () at ../../../net-snmp/agent/agent_registry.c:1423
#8 0x0ff9d930 in init_agent (app=0x1 <Address 0x1 out of bounds>)
at ../../../net-snmp/agent/snmp_vars.c:231
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