diff options
authorHarald Welte <>2013-06-24 17:17:41 +0200
committerHarald Welte <>2013-06-24 17:17:41 +0200
commit3a58450d116587e86caf8561f3ffa3425aa80a58 (patch)
parentcb55abc0f792613a3e2f684bb043a9f78828ff75 (diff)
TCAP ISM: trap the EXIT signal to avoid getting killed too early
When we receive a TC-END with RESULT-L, the process hierarchy might kill us before we received the RESSULT-L, or aftger we received it, but before we had a chance to deliver it to the TC User. Trapping the EXIT flag solves the problem. It also means that the EXIT signal will not propagate to other linked processes. However, there should be no other processes, as ISM is not starting any.
1 files changed, 8 insertions, 1 deletions
diff --git a/TCAP/src/ITU/tcap_ism_fsm.erl b/TCAP/src/ITU/tcap_ism_fsm.erl
index 6c89615..2793f6c 100644
--- a/TCAP/src/ITU/tcap_ism_fsm.erl
+++ b/TCAP/src/ITU/tcap_ism_fsm.erl
@@ -89,6 +89,9 @@ start_link(Usap, DialogueId, InvokeId, OpClass, InvTimeout) ->
% DHA needs to tell us: USAP, DialogueID, InvokeID, CCO-PID, OpClass, InvTimer
init([Usap, DialogueId, InvokeId, CcoPid, OpClass, InvTimeout]) ->
+ % we need to trap EXIT signals, as otherwise we might be terminated by
+ % the dialogue END before we have delivered the components to the TC-User.
+ process_flag(trap_exit, true),
State = #state{usap = Usap, dialogueId = DialogueId,
invokeId = InvokeId, cco = CcoPid,
op_class = OpClass, inv_timeout = InvTimeout},
@@ -230,7 +233,11 @@ handle_info(Info, StateName, State) ->
{next_state, StateName, State}.
%% handle a shutdown request
-terminate(_Reason, _StateName, _State) -> ok.
+terminate(Reason, StateName, State) ->
+ timer:cancel(State#state.inv_timer),
+ timer:cancel(State#state.rej_timer),
+ error_logger:format("~w (~w) terminating Reason: ~w in state ~w~n",
+ [?MODULE, self(), Reason, StateName]).
%% handle updating state data due to a code replacement
code_change(_OldVsn, StateName, State, _Extra) ->