unregistering handlers

Hi,
  I'm writing code that should be run either as part of a snmp subagent
or as a dynamically loadable module inside snmpd. The init_mymodule
function, either called by the main fuction of the subagent or by snmpd
upon loading, will have to register a bunch of handlers depending on
configuration directives. The tutorial on loadable modules states that
all registered handlers must be unregistered before module unloading to
avoid unpleasantness like core dumps. 
  Thus I made init_mymodule store the  netsnmp_handler_registration *
for each handler in a netsnmp_data_list using the handlerName as key.
The freeing callback call netsnmp_unregister_handler on its argument and
I have deinit_mymodule calling netsnmp_free_all_list_data. 
  Apparently everything works... At least when I execute my code in a
subagent (I have not yet tried to load the dynamically loadable module
into snmpd, I'd rather prefer to be reasonably sure that everything
works as expected before doing so). 
  Then I thought that may be unregistering the handlers was not enough,
what about data leak? Thus I tried to have the freeing callback calling
netsnmp_handler_registration_free too. That was a bad idea, as now the
subagent crashes when trying to call netsnmp_handler_registration_free
on the first handler complaining that it tried to call free on some
invalid pointer. 
  The question is: it is enough to call netsnmp_unregister_handler to
avoid memory leaks? 
  A secondary question could be: do I have the right approach? :) 

  Thanks a lot for having read until here and for your help...

 
-- 
Leo Cacciari
Aliae nationes servitutem pati possunt. Populi romani est propria
libertas


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