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File 3221-snmp-manager-Make-it-possible-to-restart-the-net-if.patch of Package erlang (Revision ac78bcc5a6f7a4d1efd770008567e9f7)

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From 7e6b8ff83228ca672ad3d2ebc170db4f4a7dba0f Mon Sep 17 00:00:00 2001
From: Micael Karlberg <bmk@erlang.org>
Date: Tue, 4 Feb 2020 17:03:22 +0100
Subject: [PATCH 1/5] [snmp|manager] Make it possible to restart the net-if

Make it possible to restart the net-if. This can be usefull
if the net-if process "gets stuck"...

OTP-16447
---
 lib/snmp/src/manager/snmpm.erl        | 15 +++++++++++++--
 lib/snmp/src/manager/snmpm_server.erl | 36 +++++++++++++++++++++++------------
 2 files changed, 37 insertions(+), 14 deletions(-)

diff --git a/lib/snmp/src/manager/snmpm.erl b/lib/snmp/src/manager/snmpm.erl
index 8e60cecaf9..fe30dbbdff 100644
--- a/lib/snmp/src/manager/snmpm.erl
+++ b/lib/snmp/src/manager/snmpm.erl
@@ -1,7 +1,7 @@
 %% 
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 2004-2019. All Rights Reserved.
+%% Copyright Ericsson AB 2004-2020. All Rights Reserved.
 %% 
 %% Licensed under the Apache License, Version 2.0 (the "License");
 %% you may not use this file except in compliance with the License.
@@ -90,7 +90,8 @@
 	 sys_up_time/0,
 
 	 info/0, 
-	 verbosity/2 
+	 verbosity/2,
+         restart/1
 	]).
 
 -export([format_reason/1, format_reason/2]).
@@ -316,6 +317,16 @@ verbosity(all, V) ->
     snmpm_server:verbosity(note_store, V).
 
 
+%% -- Restart -- 
+
+%% Restart various component processes in the manager
+%% Note that the effects of this is diffiult to
+%% predict, so it should be use with *caution*!
+
+restart(net_if = What) ->
+    snmpm_server:restart(What).
+
+
 %% -- Users --
 
 %% Register the 'user'. 
diff --git a/lib/snmp/src/manager/snmpm_server.erl b/lib/snmp/src/manager/snmpm_server.erl
index fe2c22d9ba..b3740b4d83 100644
--- a/lib/snmp/src/manager/snmpm_server.erl
+++ b/lib/snmp/src/manager/snmpm_server.erl
@@ -45,13 +45,13 @@
 
 	 %% discovery/2, discovery/3, discovery/4, discovery/5, discovery/6, 
 
-	 %% system_info_updated/2, 
 	 get_log_type/0,      set_log_type/1, 
 
 	 reconfigure/0,
 
 	 info/0, 
-	 verbosity/1, verbosity/2 
+	 verbosity/1, verbosity/2,
+         restart/1
 
 	]).
 
@@ -492,6 +492,9 @@ cancel_async_request(UserId, ReqId) ->
     call({cancel_async_request, UserId, ReqId}).
 
 
+info() ->
+    call(info).
+
 verbosity(Verbosity) ->
     case ?vvalidate(Verbosity) of
 	Verbosity ->
@@ -500,9 +503,6 @@ verbosity(Verbosity) ->
 	    {error, {invalid_verbosity, Verbosity}}
     end.
 
-info() ->
-    call(info).
-
 verbosity(net_if = Ref, Verbosity) ->
     verbosity2(Ref, Verbosity);
 verbosity(note_store = Ref, Verbosity) ->
@@ -516,9 +516,10 @@ verbosity2(Ref, Verbosity) ->
 	    {error, {invalid_verbosity, Verbosity}}
     end.
 
-%% Target -> all | server | net_if
-%% system_info_updated(Target, What) ->
-%%     call({system_info_updated, Target, What}).
+
+restart(net_if = What) ->
+    cast({restart, What}).
+
 
 get_log_type() ->
     call(get_log_type).
@@ -624,7 +625,7 @@ do_init_note_store(Prio) ->
     end.
 
 do_init_net_if(NoteStore) ->
-    ?vdebug("try start net if", []),
+    ?vdebug("try start net-if", []),
     {ok, NetIfModule} = snmpm_config:system_info(net_if_module),
     case snmpm_misc_sup:start_net_if(NetIfModule, NoteStore) of
 	{ok, Pid} ->
@@ -638,6 +639,7 @@ do_init_net_if(NoteStore) ->
 	    throw({error, {failed_starting_net_if, Reason}})
     end.
 
+
 %% ---------------------------------------------------------------------
 %% ---------------------------------------------------------------------
 
@@ -1017,6 +1019,13 @@ handle_call(Req, _From, State) ->
     {reply, {error, unknown_request}, State}.
 
 
+handle_cast({restart, net_if},
+	    #state{net_if = Pid} = State) ->
+    ?vlog("received net_if (~p) restart message", [Pid]),
+    %% We will get an exit signel/message, which will trigger a (re-)start
+    exit(Pid, kill),
+    {noreply, State};
+
 handle_cast(Msg, State) ->
     warning_msg("received unknown message: ~n~p", [Msg]),
     {noreply, State}.
@@ -1080,7 +1089,7 @@ handle_info(gc_timeout, #state{gct = GCT} = State) ->
 handle_info({'DOWN', _MonRef, process, Pid, _Reason}, 
 	    #state{note_store = NoteStore, 
 		   net_if     = Pid} = State) ->
-    ?vlog("received 'DOWN' message regarding net_if", []),
+    ?vlog("received 'DOWN' message regarding net_if (~p)", [Pid]),
     {NetIf, _, Ref} = do_init_net_if(NoteStore),
     {noreply, State#state{net_if = NetIf, net_if_ref = Ref}};
 
@@ -1089,7 +1098,7 @@ handle_info({'DOWN', _MonRef, process, Pid, _Reason},
 	    #state{note_store = Pid, 
 		   net_if     = NetIf,
 		   net_if_mod = Mod} = State) ->
-    ?vlog("received 'DOWN' message regarding note_store", []),
+    ?vlog("received 'DOWN' message regarding note_store (~p)", [Pid]),
     {ok, Prio} = snmpm_config:system_info(prio),
     {NoteStore, Ref} = do_init_note_store(Prio),
     Mod:note_store(NetIf, NoteStore),
@@ -3651,6 +3660,9 @@ is_started(#state{net_if = _Pid, net_if_mod = _Mod}) ->
 
 %%----------------------------------------------------------------------
 	
+cast(Req) ->
+    gen_server:cast(?SERVER, Req).
+
 call(Req) ->
     call(Req, infinity).
 
-- 
2.16.4

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