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8/28/2008
The SNMP service polls the SnmpExtensionTrapfunction to acquire information from which it generates a trap message. The extension agent signals to the SNMP service that one or more traps need to be generated by implementing the phPollForTrapEventevent handle that is initialized in the SnmpExtensionInitfunction. The SNMP service then calls SnmpExtensionTrapto acquire trap information. The extension agent passes trap information to be sent to the SNMP service and returns TRUE. By returning TRUE, the extension agent indicates to the SNMP service that it should poll SnmpExtensionTrapagain. If no more traps need to be generated, the extension agent returns FALSE.
The SnmpExtensionTrapfunction has the following parameters:
- An OID of the management enterprise whose registration
authority defines the trap.
- A pointer to the value of the generic trap field in the trap
PDU.
- A pointer to the value of the specific trap field in the trap
PDU. Each trap that is defined in an enterprise-specific MIB
contains an enumerated value that is specified in this parameter.
- A pointer to the value of the time stamp that represents the
number of centiseconds that have elapsed since the SNMP agent was
initialized.
- A set of variable bindings that are included in the trap PDU.
The extension agent must initialize all of these variable bindings.
Note:A SNMPv 1-trap PDU contains a field that specifies the network address of the agent. In Windows Embedded CE, the SNMP agent encodes the first IP address that is returned by a call to the gethostbynameor getaddrinfofunction into the trap PDU.