Re: Regarding Table data Create and Fill

permalink · #1 (**permalink**) 03-17-2008

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Hi, 
 
As Dave says, you have to use the cache helper : 
mib2c -c mib2c.table_data.conf  -S cache=1   myDataTable 
The code produced don't compile, it's a little buggy. See my code below. 
the cache->flags is set to call each time the load function. 
<a class="moz-txt-link-freetext" href="http://www.net-snmp.org/dev/agent/group__cache__handler.html">http://www.net-snmp.org/dev/agent/group__cache__handler.html</a> 
The last problem is if the table is empty the load function is never
call ! 
 
---------- 
in .h: 
NetsnmpCacheLoad myDataTable_load; 
//NetsnmpCacheFree myDataTable_free; 
 
in.c : 
initialize_table_mydataTable(void) { 
..... 
    netsnmp_tdata_register(reg, table_data, table_info); 
 
    cache = netsnmp_cache_create(-1, myDataTable_load,
(NetsnmpCacheFree *)myDataTable_free, 
        myDataTable_oid, myDataTable_oid_len); 
  cache->magic =  (void *) table_data; 
  cache->flags = NETSNMP_CACHE_DONT_INVALIDATE_ON_SET |
NETSNMP_CACHE_DONT_FREE_BEFORE_LOAD | NETSNMP_CACHE_DONT_FREE_EXPIRED |
NETSNMP_CACHE_DONT_AUTO_RELEASE; 
 
  netsnmp_inject_handler_before(reg,
netsnmp_cache_handler_get(cache),"mydataTable");
    // Init table 
    mydataTable_load(cache, table_data); 
 
} 
 
 
int myDataTable_load(netsnmp_cache * cache, void *vmagic) 
{ 
  netsnmp_tdata * table_data = (netsnmp_tdata *) vmagic; 
  netsnmp_tdata_row *row; 
  struct myDataTable_entry *row_entry;  
  
    row = NULL; 
  row = netsnmp_tdata_row_next(table_data, row); 
  row_entry = (struct myDataTable_entry *)row->data; 
  row_entry->myDataVal1++; 
    .... 
} 
------- 
 
Stephane. 
 
kumar undurthi a écrit :
<blockquote
cite="mid:ae35fd890803141232r2bee2f8bi9254f90f2527 8e92@mail.gmail.com"
type="cite">Hi All, 
 
      I have requirement in which i have to fill the table data when
ever a request will come, For example check the below  example.... it
was generated by using mib2c.table_data.conf. 
        &n bsp; : in which "ocStbHostAVInterfaceTable_handler"  is taking
care of the requests, So my requirement is 
when the a request come  at " i.e   "(check in code )  case MODE_GET:" 
then i want to update the table instated of initialize the  table first
(filling the table)  at (check in code "
initialize_table_ocStbHostAVInterfaceTable(void) " ) 
 
Please give the Solution as early as possible..... (adv Thank's) 
</blockquote>
....    
<blockquote
cite="mid:ae35fd890803141232r2bee2f8bi9254f90f2527 8e92@mail.gmail.com"
type="cite"> 
<div class="gmail_quote">On Wed, Mar 12, 2008 at 6:39 AM, Dave Shield
<<a moz-do-not-send="true" href="mailto:D.T.Shield@liverpool.ac.uk">D.T.Shiel d@liverpool.ac.uk</a>>
wrote: 
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d">On 11/03/2008, kumar undurthi <<a
moz-do-not-send="true" href="mailto:manu1394@gmail.com">manu1394@gmail.co m</a>>
wrote: 
>        I have a problem in creating a table and Fill the table. i.e 
> Normally table can create in initialization() part and can be fill
with the 
> static data. 
> But in My case.... I want to Create and Fill the table with the
dynamic 
> data(values) when ever a request comes to the Agent. 
 
</div>
Probably the best approach would be to use the cache helper. 
 
You haven't said how you are generating the code, 
or which table helper you are using.   But if you run 
something like 
   mib2c -c mib2c.table_data.conf  -S cache=1   myTable 
 
this should generate a suitable framework for your MIB module, 
including the code to load the table data when a request 
comes in.   This cached data will then be used for the next 
few requests, until it's judged "too old".  Whereupon the 
next request will trigger a fresh reload. 
 
 The same approach can be used with the iterator helper 
(same command, but specifying 'mib2c.iterator.conf'), 
and probably also with the MfD framework. 
 (though I don't know much about that one). 
 
Dave 
</blockquote>
</div>
 
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