how to cleanly unregister a scalar (w/o memory leaks and such)?

Hi together,

I've a question concerning the unregistration of scalars.
I use the following code to register an int32_t as a scalar:

------------- 8< -----------------------------------------------
int32_t *my_scalar = (int32_t*) malloc(sizeof(int32_t));

netsnmp_handler_registration *reg =
     netsnmp_create_handler_registration( "my_scalar",
                                          NULL,
                                          oid, oidlen, /* some OID */
                                          HANDLER_CAN_RONLY );

netsnmp_watcher_info *winfo =
     netsnmp_create_watcher_info( my_scalar,
                                  sizeof(*my_scalar),
                                  ASN_INTEGER,
                                  WATCHER_FIXED_SIZE );

netsnmp_register_watched_scalar( reg, winfo );
------------- 8< -----------------------------------------------

Now I want to de-register that scalar (e.g. because "my_scalar" gets freed).

If I just free the scalar (and do no unregistration stuff), the variable
still gets reported by snmpwalk. I know, it operates on "undefined"
memory then, and it's only a question of time when the application
crashes. Not what I want.

So I called
------------- 8< -----------------------------------------------
free( my_scalar );
netsnmp_unregister_handler( reg );
------------- 8< -----------------------------------------------

Works fine, the variable is no loger reported by snmpwalk.
But don't I have to de-allocate the watcher-info? And/or somehow
have to "undo" the call to netsnmp_register_watched_scalar()?
Do I have to call SNMP_FREE(reg) or SNMP_FREE(winfo) or does that
already take place behind the scenes?

I couldn't figure that out by reading the docs (and the sources
neither).

Any help appreciated.

Thanks in advance,
    Dirk





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