Ok, got it, I think I missed the "old_api" part. Thanks a lot Dave, I appreciate your great help.
Best, Yong Chen -----Original Message----- From: Dave Shield [mailto:[EMAIL PROTECTED] Sent: Thursday, December 08, 2005 1:18 AM To: Yong Chen (yongche) Cc: [email protected] Subject: RE: Question about netsnmp_call_handlers() function in snmp_agent.c On Wed, 2005-12-07 at 16:02 -0800, Yong Chen (yongche) wrote: > 1. where do you populate treecache for a SET request? > Is it "netsnmp_add_varbind_to_cache"? And is it the place that you > combine all varbinds having the same handler into one "requests" I think so, yes. I'm not very familiar with that code (and don't have the time to read it carefully), but a brief scan seems to indicate that this is probably where most of the work is done. > This func is not very easy to understand. A little more high-level comments might be useful, certainly. I suggest you ask your vendor for a refund :-) > 2. As I mentioned, I'm actually using 4.x style So for my case, do I > still have varbinds combined? No. As I said yesterday, the v4 model processes each varbind separately - so your write method will be called once for each varbind in the request (per pass) But see below. > 3. Since I'm not using 5.x handler API, do you consider > "my_write_method" as a handler?... how is my_write_method called in > 5.x agent? OK - now you're getting more into the detailed internal implementation nitty-gritty. v4-style MIB modules (within a v5 agent) are handled by the 'old_api' helper (see 'helpers/old_api.c' - and in particular 'netsnmp_old_api_helper()') Basically, this maps v5 handler-style processing into the previous get_*/write_* routines. So returning to your second question: > For a SET pdu like: > > set my_table.a=1, my_table.b=2, my_table.c=3 > > How many times will netsnmp_call_handlers() be called? "netsnmp_call_handlers" will be called once (I think), which will pass all three varbinds down the handler chain to 'netsnmp_old_api_helper'. This will then call 'get_mytable' three times, followed by 'write_mytable_X' three times for each SET pass. OK? Dave ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_idv37&alloc_id865&op=click _______________________________________________ Net-snmp-users mailing list [email protected] Please see the following page to unsubscribe or change other options: https://lists.sourceforge.net/lists/listinfo/net-snmp-users
