shutdown node VS disconnect all hooks

[Gleb Smirnoff]

On Fri, May 28, 2004 at 01:15:06AM -0700, Julian Elischer wrote:
J> > JE>>   So, what about adding one more netgraph method into struct ng_type, say
J> > JE>> ng_preshutdown_t? This method is called first in ng_rmnode(), and then 
J> > JE>> current shutdown sequence is followed. We will set it to NULL in all existing
J> > JE>> nodes, and create a method in ng_tee, which calls ng_bypass(). Future
J> > JE>> implementations may use this method to send "goodbye" messages down hooks when
J> > JE>> shutting down.
J> > JE>
J> > JE>That sounds like a much better solution. Node shutdown is done in 2
J> > JE>parts just as node connection is done in 2 parts.
J> > JE>
J> > JE>>   And this will be a POLA-friendly solution - we will not lose functionality
J> > JE>> of RELENG_4 (which mpd relies on), and we will not break nodes which
J> > JE>> rely on current shutdown sequence.
J> > JE>> 
J> > JE>>   What's your opinion? If it is positive - I'll send patches.
J> > JE>> 
J> > JE>
J> > JE>That is a very workable solution.
J> > 
J> > If you do that, I suppose you need to edit all the nodes, right?. In that
J> > case could you please convert the initialisation of the typestructs
J> > to use C99 sparse initialisation? In that case future changes will be a good
J> > deal easier.
J> 
J> actually I don't know if you do need to edit the nodes
J> types.. At one time it was true that unassigned elements on
J> the end will be NULL.

I like idea of sparse initialization. We already have this in ng_hub.c. Julian,
if you don't mind, I'll create diff moving all initializations to C99 sparse type.

-- 
Totus tuus, Glebius.
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