Re: "Holes" in oid sequence.

On Wed, 14 Sep 2005 11:53:50 -0700 Tom wrote:
TC>     We're continually adding new features to our product, and that's in 
TC> conflict with the cardinal rule above. The process that I'm considering 
TC> is to leave holes in the OID sequence, and new features will use those 
TC> holes. Dropped features will also leave holes in the OID's. I can't ever 
TC> want to use them again (because I'm sure someone out there will assume 
TC> it's the old feature, not a new one).

As I said in my other message, I don't think you can leave holes in tables to
fill later. Just add new columns at the end. It won't be pretty, but it will
be 100% legal. Of course, leaving hole between branches or scalar variables is
perfectly legal. And your reasoning for not re-using old object is correct.

TC> >But this structure also includes a field
TC> >
TC> >    netsnmp_column_info *valid_columns;
TC> >  
TC> >
TC>       I didn't know about this guy. I'll follow up on it.

If you use the CVS version of MFD, it generates a functions to allow you to
set the valid columns structure. Otherwise it assumes the column numbers are
contiguous. You should be able to add this function to your interface file:

void
myTable_valid_columns_set(netsnmp_column_info *vc)
{
    myTable_if_ctx.tbl_info.valid_columns = vc;
} /* myTable_valid_columns_set */


Make sure the netsnmp_column_info structure you point to is not a local
variable (make it static, or allocate memory for it).


-- 
NOTE: messages sent directly to me, instead of the lists, will be deleted
      unless they are requests for paid consulting services.

Robert Story; NET-SNMP Junkie
Support: <http://www.net-snmp.org/> <irc://irc.freenode.net/#net-snmp>  
Archive: <http://sourceforge.net/mailarchive/forum.php?forum=net-snmp-users>

You are lost in a twisty maze of little standards, all different. 


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