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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| No
| Win32s
| No
| Import Library
| user-defined
| Header File
| -
| Unicode
| No
| Platform Notes
| None
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SnmpExtensionTrap
The extensible agent calls the SnmpExtensionTrap function in the extension agent DLL to retrieve traps generated by the
extension agent.
BOOL SnmpExtensionTrap(
AsnObjectIdentifier *enterprise,
| // Generating enterprise
| AsnInteger *genericTrap,
| // Generating trap type
| AsnInteger *specificTrap,
| // Enterprise specific type
| AsnTimeticks *timeStamp,
| // Time stamp
| RFC1157VarBindList *variableBindings
| // Variable bindings
| );
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Parameters
enterprise
[out] Points to an object identifier that indicates the originating object
generating the trap. The extensible agent does not free the memory for this
variable.
genericTrap
[out] Points to an indication of the generic trap. This parameter can be one
of the following values:
Value
| Meaning
| SNMP_GENERICTRAP_COLDSTART
| The agent is initializing protocol entities on the managed mode. It may alter
objects in its view.
| SNMP_GENERICTRAP_WARMSTART
| The agent is re-initializing itself but will not alter objects within its view.
| SNMP_GENERICTRAP_LINKDOWN
| An attached interface has changed from the up state to the down state. The first variable identifies the interface.
| SNMP_GENERICTRAP_LINKUP
| An attached interface has changed from the down state to the up state. The first variable identifies the interface.
| SNMP_GENERICTRAP_AUTHFAILURE
| An SNMP entity has sent an SNMP message, but has falsely claimed to belong to
a known community.
| SNMP_GENERICTRAP_EGPNEIGHLOSS
| An EGP peer has changed to the down state. The first variable identifies the IP address of the EGP peer.
| SNMP_GENERICTRAP_ENTERSPECIFIC
| Signals an extraordinary event that is identified in the specific-trap parameter.
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specificTrap
[out] Points to an indication of the specific trap generated.
timeStamp
[out] Points to a variable to receive the time stamp.
[out] Points to the variable bindings list. The memory for the list will be
allocated by the extension agent. The extensible agent will free the memory with
a call to the SnmpUtilVarBindListFree function.
Return Values
If the SnmpExtensionTrap function returns a trap in its parameters, the return value is TRUE.
Otherwise, the extensible agent repeatedly calls the function until it returns a value
of FALSE.
Remarks
The extensible agent repeatedly calls the SnmpExtensionTrap function once the hPollForTrapEvent event handle of the SnmpExtensionInit function has been set to the signaled state. Each successful call returns
data from a single trap. It returns FALSE to indicate that its parameters do not
represent valid trap data and to stop the extensible agent's repeated calls.
The extension agent must not free the memory for the variableBindings parameter. The extensible agent automatically performs this action. Use the SnmpUtilMemAlloc function to allocate memory for each RFC1157VarBind structure.
It is important to note that earlier documentation stated that the extension
agent should dynamically allocate memory for the enterprise object identifier
because the extensible agent would attempt to release the memory after sending a
trap. The extensible agent will not release the memory associated with the
enterprise object identifier. The recommendation is that you return a pointer to a
static AsnObjectIdentifier structure instead.
See Also
SetEvent, SnmpUtilMemAlloc, SnmpUtilVarBindListFree, RFC1157VarBindList, SnmpExtensionInit
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