I am not certain, but I would expect the NULL if you are sending traps in 
the standard way, to 162/udp.
The agent, trapd,  does not respond, but the blocking send expects a 
response, so I think it will just time out and you'll get the NULL.
All the examples of this I have seen, use a non-blocking send for traps.

Some our daemons (notably netmon) do set up a TCP session with trapd to 
send traps, but I think in that case all they get back is an ack that the 
last pdu was received without errors and then they disconnect.  Whether 
this is available to you in the APIs I don't know.  Not a netmon guy.

James Shanks
Level 3 Support  for Tivoli NetView for UNIX and NT
Tivoli Software / IBM Software Group




"Allison, Jason (JALLISON)" <JALLISON AT arinc DOT com>
11/22/2002 10:00 AM

 
        To:     "'nv-l'" <nv-l AT lists.tivoli DOT com>
        cc: 
        Subject:        [nv-l] trap response



OVsnmpBlockingSend:

Return Values:
quote:  If successful, OVsnmpBlockingSend returns a pointer to an 
OVsnmpPdu
structure that contains the response to the outbound PDU.  If 
unsuccessful,
it returns NULL.

Question:
In the case of:  playback_pdu = OVsnmpCreatePdu(TRAP_REQ_MSG);

What will my "response" be?  I am sending a trap, what can I expect in the
PDU?  The trap I sent?  Any needed data?  I am really only concerned if it
is != NULL, but for my reference, I would like to know what comes back on 
a
successful send.

Thanks,

Jason Allison
Principal Engineer
ARINC Incorporated
Office:  (410) 266-2006
FAX:  (410) 573-3026


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