RE: Return type

HI!
Let me thank for your constant support.

> The var_system routine doesn't know whether this is a GET
> Or a SET request. But the code that *calls* the var_system
> Routine does.
Which code is calling var_system function and how
calling code will tell it is set request to the function var_system so
that var_system will set up the write_method hook value, here what is
hook value to invoke the SET processing code for that object.

With Regards,
G. Siva Prakash Reddy.




-----Original Message-----
From: dave.shield@googlemail.com [mailto:dave.shield@googlemail.com] On
Behalf Of Dave Shield
Sent: Wednesday, January 02, 2008 5:32 PM
To: Siva Prakash Reddy G
Cc: net-snmp-coders@lists.sourceforge.net
Subject: Re: Return type

On 02/01/2008, Siva Prakash Reddy G <sivag@aztecsoft.com> wrote:
> when I execute snmpset command example....
> how var_system function will know that it is set request....

It doesn't.
The var_system function is called in an identical fashion for both
a GET request and a SET request.


> how it will know it is a set request and how
> it will execute the *write_method = writeSystem;

It doesn't know whether this is a GET or a SET request,
so it should return the appropriate 'write_method' hook
routine.

> if it is get request then writeSystem function won't be called.
> How this is can be happened.

The var_system routine doesn't know whether this is a GET
or a SET request. But the code that *calls* the var_system
routine does.
So var_system will set up the write_method hook value,
just in case this is a SET request. If it is, then the agent
driving code will use this hook value to invoke the SET
processing code for that object.
If this is actually a GET request, then the agent driving
code will simply ignore the 'write_method' value.


Dave


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