Thank U Dave
-sanjay
Dave Shield wrote:
On 28 January 2010 06:45, sanjaykumar <sanjay.ku...@globaledgesoft.com> wrote:
I am not able to understand the meaning of following parameters.
As there numerous function in net-snmp-5.4.2.1 having following parameter.
Could someone explain the meaning of these parameters in DETAILS.
1. int majorID
2. int minorID
3. void *serverarg
4. void *clientarg
As in function: int snmpv3_store(int majorID, int minorID, void
*serverarg, void *clientarg)
These parameters are related to how the "callback" mechanism operates.
The first two parameters (major, minor) match those used when registering
the callback. (see snmpNotifyTable). These are used to control when this
particular callback routine will be invoked, and are passed to the callback
routine in case it needs to distinguish between different possible invocations.
It is also possible to supply some arbitrary data as part of this registration
(using the final parameter of the registration call). This is then passed to
the callback routine as the 'clientarg' parameter.
The code that triggers the callback (snmp_call_callbacks) can also provide
some arbitrary data, which is passed to the callback routine as 'serverarg'.
This is used by (e.g.) the access control callbacks, or those concerned with
registering MIB modules.
If you search the code for mention of SNMP_CALLBACK, you'll find examples
of both registration of such callbacks (snmp_register_callback), and where
these are callbacks are invoked (snmp_call_callbacks).
This mechanism is used both within the Net-SNMP library (when majorID is
SNMP_CALLBACK_LIBRARY), and the agent (SNMP_CALLBACK_APPLICATION)
Dave
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