The R13B03 release.OTP_R13B03

1 files changed, 116 insertions, 0 deletions

diff --git a/lib/snmp/src/agent/snmpa_agent_sup.erl b/lib/snmp/src/agent/snmpa_agent_sup.erl
new file mode 100644
index 0000000000..9b8c4d12a6
--- /dev/null
+++ b/lib/snmp/src/agent/snmpa_agent_sup.erl
@@ -0,0 +1,116 @@
+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 1997-2009. All Rights Reserved.
+%% 
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% %CopyrightEnd%
+%%
+-module(snmpa_agent_sup).
+
+-include("snmp_debug.hrl").
+
+-behaviour(supervisor).
+
+%% External exports
+-export([start_link/0, start_link/1, start_subagent/3, stop_subagent/1]).
+
+%% Internal exports
+-export([init/1]).
+
+-define(SERVER, ?MODULE).
+-ifdef(snmp_debug).
+-define(DEFAULT_OPTS, [{verbosity, trace}]).
+-else.
+-define(DEFAULT_OPTS, []).
+-endif.
+
+
+%%%-----------------------------------------------------------------
+%%% This is a supervisor for the mib processes.  Each agent has one
+%%% mib process.
+%%%-----------------------------------------------------------------
+start_link() ->
+    ?d("start_link -> entry", []),
+    supervisor:start_link({local, ?SERVER}, ?MODULE, [[]]).
+
+start_link(AgentSpec) ->
+    ?d("start_link -> entry with"
+	"~n   AgentSpec: ~p", [AgentSpec]),
+    supervisor:start_link({local, ?SERVER}, ?MODULE, [[AgentSpec]]).
+
+start_subagent(ParentAgent, Subtree, Mibs) ->
+    ?d("start_subagent -> entry with"
+	"~n   ParentAgent: ~p"
+	"~n   Subtree:     ~p"
+	"~n   Mibs:        ~p", [ParentAgent, Subtree, Mibs]),
+    Children = supervisor:which_children(?SERVER),
+    ?d("start_subagent -> Children: ~n~p", [Children]),
+    Max = find_max(Children, 1),
+    ?d("start_subagent -> Max: ~p", [Max]),
+    [{_, Prio}] = ets:lookup(snmp_agent_table, priority),
+    ?d("start_subagent -> Prio: ~p", [Prio]),
+    Ref = make_ref(),
+    ?d("start_subagent -> Ref: ~p", [Ref]),
+    Options = [{priority, Prio}, 
+	       {mibs, Mibs}, 
+	       {misc_sup, snmpa_misc_sup} | ?DEFAULT_OPTS],
+    Agent = {{sub_agent, Max},
+	     {snmpa_agent, start_link,
+	      [Prio, ParentAgent, Ref, Options]},
+	     permanent, 2000, worker, [snmpa_agent]},
+    case supervisor:start_child(?SERVER, Agent) of
+	{ok, SA} -> 
+	    ?d("start_subagent -> SA: ~p", [SA]),
+	    snmpa_agent:register_subagent(ParentAgent, Subtree, SA),
+	    {ok, SA};
+	Error ->
+	    ?d("start_subagent -> Error: ~p", [Error]),
+	    Error
+    end.
+
+stop_subagent(SubAgentPid) ->
+    case find_name(supervisor:which_children(?SERVER), SubAgentPid) of
+	undefined -> 
+	    no_such_child;
+	Name ->
+	    supervisor:terminate_child(?SERVER, Name),
+	    supervisor:delete_child(?SERVER, Name),
+	    ok
+    end.
+
+init([Children]) ->
+    ?d("init -> entry with"
+	"~n   Children: ~p", [Children]),
+    %% 20 restarts in ten minutes.  If the agent crashes and restarts,
+    %% it may very well crash again, because the management application
+    %% tries to resend the very same request.  This depends on the resend
+    %% strategy used by the management application.
+    SupFlags = {one_for_one, 20, 600},
+    {ok, {SupFlags, Children}}.
+
+
+find_max([{{sub_agent, N}, _, _, _} | T], M) when N >= M -> find_max(T, N+1);
+find_max([_|T], M) -> find_max(T, M);
+find_max([], M) -> M.
+
+find_name([{Name, Pid, _, _} | _T], Pid)-> Name;
+find_name([_|T], Pid) -> find_name(T, Pid);
+find_name([], _Pid) -> undefined.
+
+
+% i(F) ->
+%     i(F, []).
+
+% i(F, A) ->
+%     io:format("~p:~p: " ++ F ++ "~n", [node(),?MODULE|A]).