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File 0425-megaco-Fixed-various-dialyzer-related-issues.patch of Package erlang (Revision 6de63e94d59bfadd1474930a5becda86)

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From 53c7de3ad0c8e2143ec2a6abdd4daa45e77ff61b Mon Sep 17 00:00:00 2001
From: Micael Karlberg <bmk@erlang.org>
Date: Wed, 13 Jul 2022 16:36:32 +0200
Subject: [PATCH 5/7] [megaco] Fixed various dialyzer related issues

OTP-18179
---
 lib/megaco/src/app/megaco.erl                 |   8 +-
 lib/megaco/src/engine/megaco_config.erl       |  28 ++--
 lib/megaco/src/engine/megaco_digit_map.erl    |   4 +-
 lib/megaco/src/engine/megaco_messenger.erl    | 137 +++++++++---------
 lib/megaco/src/engine/megaco_monitor.erl      |   6 +-
 lib/megaco/src/engine/megaco_stats.erl        |   4 +-
 lib/megaco/src/engine/megaco_trans_sender.erl |   8 +-
 lib/megaco/src/flex/megaco_flex_scanner.erl   |  12 +-
 lib/megaco/src/tcp/megaco_tcp.erl             |  18 +--
 lib/megaco/src/tcp/megaco_tcp_connection.erl  |  12 +-
 lib/megaco/src/udp/megaco_udp.erl             |  18 +--
 lib/megaco/src/udp/megaco_udp_server.erl      |   6 +-
 12 files changed, 132 insertions(+), 129 deletions(-)

diff --git a/lib/megaco/src/app/megaco.erl b/lib/megaco/src/app/megaco.erl
index de6caaae3b..d0816b1dd0 100644
--- a/lib/megaco/src/app/megaco.erl
+++ b/lib/megaco/src/app/megaco.erl
@@ -721,10 +721,10 @@ nc() ->
     nc(Mods).
 
 nc(all) ->
-    application:load(?APPLICATION),
+    _ = application:load(?APPLICATION),
     case application:get_key(?APPLICATION, modules) of
 	{ok, Mods} ->
-	    application:unload(?APPLICATION),
+	    _ = application:unload(?APPLICATION),
 	    nc(Mods);
 	_ ->
 	    {error, not_found}
@@ -741,10 +741,10 @@ ni() ->
     end.
 
 ni(all) -> 
-    application:load(?APPLICATION),
+    _ = application:load(?APPLICATION),
     case application:get_key(?APPLICATION, modules) of
 	{ok, Mods} ->
-	    application:unload(?APPLICATION),
+	    _ = application:unload(?APPLICATION),
 	    ni(Mods);
 	_ ->
 	    {error, not_found}
diff --git a/lib/megaco/src/engine/megaco_config.erl b/lib/megaco/src/engine/megaco_config.erl
index 0805acab9b..1b019fd535 100644
--- a/lib/megaco/src/engine/megaco_config.erl
+++ b/lib/megaco/src/engine/megaco_config.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2000-2021. All Rights Reserved.
+%% Copyright Ericsson AB 2000-2022. 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.
@@ -899,9 +899,9 @@ init([Parent]) ->
 
 do_init() ->
     ?megaco_test_init(),
-    ets:new(megaco_config,      [public, named_table, {keypos, 1}]),
-    ets:new(megaco_local_conn,  [public, named_table, {keypos, 2}]),
-    ets:new(megaco_remote_conn, [public, named_table, {keypos, 2}, bag]),
+    _ = ets:new(megaco_config,      [public, named_table, {keypos, 1}]),
+    _ = ets:new(megaco_local_conn,  [public, named_table, {keypos, 2}]),
+    _ = ets:new(megaco_remote_conn, [public, named_table, {keypos, 2}, bag]),
     megaco_stats:init(megaco_stats, global_snmp_counters()),
     init_scanner(),
     init_user_defaults(),
@@ -1467,7 +1467,7 @@ handle_start_user(Mid, Config) ->
     case catch user_info(Mid, mid) of
         {'EXIT', _} ->
 	    DefaultConfig = user_info(default, all),
-            do_handle_start_user(Mid, DefaultConfig),
+            _ = do_handle_start_user(Mid, DefaultConfig),
 	    do_handle_start_user(Mid, Config);
         _LocalMid ->
             {error, {user_already_exists, Mid}}
@@ -1482,7 +1482,7 @@ do_handle_start_user(UserMid, [{Item, Val} | Rest]) ->
             {error, Reason}
     end;
 do_handle_start_user(UserMid, []) ->
-    do_update_user(UserMid, mid, UserMid),
+    _ = do_update_user(UserMid, mid, UserMid),
     ok;
 do_handle_start_user(UserMid, BadConfig) ->
     ets:match_delete(megaco_config, {{UserMid, '_'}, '_'}),
@@ -1715,7 +1715,7 @@ update_auto_ack(#conn_data{trans_timer  = To,
     %% sender goes down. 
     %% Do we need to store the ref? Will we ever need to 
     %% cancel this (apply_at_exit)?
-    megaco_monitor:apply_at_exit(?MODULE, trans_sender_exit, [CH], Pid),
+    _ = megaco_monitor:apply_at_exit(?MODULE, trans_sender_exit, [CH], Pid),
 
     CD#conn_data{auto_ack = true, trans_sender = Pid};
 
@@ -1746,7 +1746,7 @@ update_trans_ack(#conn_data{trans_timer  = To,
     %% sender goes down. 
     %% Do we need to store the ref? Will we ever need to 
     %% cancel this (apply_at_exit)?
-    megaco_monitor:apply_at_exit(?MODULE, trans_sender_exit, [CH], Pid),
+    _ = megaco_monitor:apply_at_exit(?MODULE, trans_sender_exit, [CH], Pid),
 
     CD#conn_data{trans_ack = true, trans_sender = Pid};
 
@@ -1775,7 +1775,7 @@ update_trans_req(#conn_data{trans_timer  = To,
     %% sender goes down. 
     %% Do we need to store the ref? Will we ever need to 
     %% cancel this (apply_at_exit)?
-    megaco_monitor:apply_at_exit(?MODULE, trans_sender_exit, [CH], Pid),
+    _ = megaco_monitor:apply_at_exit(?MODULE, trans_sender_exit, [CH], Pid),
 
     CD#conn_data{trans_req = true, trans_sender = Pid};
 
@@ -1799,7 +1799,7 @@ update_trans_timer(#conn_data{auto_ack     = true,
     %% sender goes down. 
     %% Do we need to store the ref? Will we ever need to 
     %% cancel this (apply_at_exit)?
-    megaco_monitor:apply_at_exit(?MODULE, trans_sender_exit, [CH], Pid),
+    _ = megaco_monitor:apply_at_exit(?MODULE, trans_sender_exit, [CH], Pid),
 
     CD#conn_data{trans_timer = To, trans_sender = Pid};
 
@@ -1817,7 +1817,7 @@ update_trans_timer(#conn_data{trans_req    = true,
     %% sender goes down. 
     %% Do we need to store the ref? Will we ever need to 
     %% cancel this (apply_at_exit)?
-    megaco_monitor:apply_at_exit(?MODULE, trans_sender_exit, [CH], Pid),
+    _ = megaco_monitor:apply_at_exit(?MODULE, trans_sender_exit, [CH], Pid),
 
     CD#conn_data{trans_timer = To, trans_sender = Pid};
 
@@ -1968,7 +1968,7 @@ trans_sender_start(#conn_data{conn_handle        = CH,
     %% sender goes down. 
     %% Do we need to store the ref? Will we ever need to 
     %% cancel this (apply_at_exit)?
-    megaco_monitor:apply_at_exit(?MODULE, trans_sender_exit, [CH], Pid),
+    _ = megaco_monitor:apply_at_exit(?MODULE, trans_sender_exit, [CH], Pid),
 
     CD#conn_data{trans_sender = Pid};
 
@@ -1997,7 +1997,7 @@ trans_sender_start(#conn_data{conn_handle        = CH,
     %% sender goes down. 
     %% Do we need to store the ref? Will we ever need to 
     %% cancel this (apply_at_exit)?
-    megaco_monitor:apply_at_exit(?MODULE, trans_sender_exit, [CH], Pid),
+    _ = megaco_monitor:apply_at_exit(?MODULE, trans_sender_exit, [CH], Pid),
 
     CD#conn_data{trans_sender = Pid};
 
@@ -2150,7 +2150,7 @@ update_snmp_counters(CH, PrelCH, [Counter|Counters]) ->
     PrelKey = {PrelCH, Counter},
     Key     = {CH, Counter},
     [{PrelKey,PrelVal}] = ets:lookup(megaco_stats, PrelKey),
-    ets:update_counter(megaco_stats, Key, PrelVal),
+    _ = ets:update_counter(megaco_stats, Key, PrelVal),
     ets:delete(megaco_stats, PrelKey),
     update_snmp_counters(CH, PrelCH, Counters).
 
diff --git a/lib/megaco/src/engine/megaco_digit_map.erl b/lib/megaco/src/engine/megaco_digit_map.erl
index 5b8b1f3b8f..820cb2179e 100644
--- a/lib/megaco/src/engine/megaco_digit_map.erl
+++ b/lib/megaco/src/engine/megaco_digit_map.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 2000-2016. All Rights Reserved.
+%% Copyright Ericsson AB 2000-2022. 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.
@@ -842,7 +842,7 @@ cast(Pid, Event) ->
 test(DigitMap, Events) ->
     Self = self(),
     Pid = spawn_link(?MODULE, test_eval, [DigitMap, Self]),
-    report(Pid, Events),
+    _ = report(Pid, Events),
     receive
 	{Self, Pid, Res} ->
 	    Res;
diff --git a/lib/megaco/src/engine/megaco_messenger.erl b/lib/megaco/src/engine/megaco_messenger.erl
index 2a9ecee2a7..dfb10dc869 100644
--- a/lib/megaco/src/engine/megaco_messenger.erl
+++ b/lib/megaco/src/engine/megaco_messenger.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 1999-2019. All Rights Reserved.
+%% Copyright Ericsson AB 1999-2022. 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.
@@ -545,7 +545,7 @@ disconnect(ConnHandle, DiscoReason)
     case megaco_config:disconnect(ConnHandle) of
         {ok, ConnData, RemoteConnData} ->
             ControlRef = ConnData#conn_data.monitor_ref,
-            cancel_apply_at_exit(ControlRef),
+            _ = cancel_apply_at_exit(ControlRef),
             handle_disconnect_callback(ConnData, DiscoReason),
             ControlNode = node_of_control_pid(ConnData#conn_data.control_pid),
             case ControlNode =:= node() of
@@ -554,7 +554,7 @@ disconnect(ConnHandle, DiscoReason)
                     CancelFun =
                         fun(RCD) ->
                                 UserRef = RCD#remote_conn_data.monitor_ref,
-                                cancel_apply_at_exit(UserRef),
+                                _ = cancel_apply_at_exit(UserRef),
                                 RCD#remote_conn_data.user_node
                           end,
                     Nodes = lists:map(CancelFun, RemoteConnData),
@@ -602,7 +602,7 @@ disconnect_remote(_Reason, ConnHandle, UserNode) ->
     case megaco_config:disconnect_remote(ConnHandle, UserNode) of
         [RCD] ->
             Ref = RCD#remote_conn_data.monitor_ref,
-            cancel_apply_at_exit(Ref),
+            _ = cancel_apply_at_exit(Ref),
             ok;
         [] ->
             {error, {no_connection, ConnHandle}}
@@ -619,9 +619,10 @@ receive_message(ReceiveHandle, ControlPid, SendHandle, Bin) ->
 
 receive_message(ReceiveHandle, ControlPid, SendHandle, Bin, Extra) ->
     Opts = [link , {min_heap_size, 5000}],
-    spawn_opt(?MODULE,
-               process_received_message,
-               [ReceiveHandle, ControlPid, SendHandle, Bin, self(), Extra], Opts),
+    _ = spawn_opt(?MODULE,
+                  process_received_message,
+                  [ReceiveHandle,
+                   ControlPid, SendHandle, Bin, self(), Extra], Opts),
     ok.
 
 %% This function is called via the spawn_opt function with the link
@@ -1131,20 +1132,20 @@ prepare_autoconnecting_trans(ConnData, [Trans | Rest], AckList, ReqList, Extra)
 
 	    Limit = ConnData#conn_data.sent_pending_limit,
 	    TransId = to_remote_trans_id(ConnData2),
-	    case check_and_maybe_incr_pending_limit(Limit, sent, TransId) of
-		ok ->
-		    send_pending(ConnData2);
-		error ->
-		    %% Pending limit:
-		    %% In this (granted, highly hypothetical case)
-		    %% we would make the user very confused if we 
-		    %% called the abort callback function, since 
-		    %% the request callback function has not yet
-		    %% been called. Alas, we skip this call here.
-		    send_pending_limit_error(ConnData);
-		aborted ->
-		    ignore
-	    end,
+	    _ = case check_and_maybe_incr_pending_limit(Limit, sent, TransId) of
+                    ok ->
+                        send_pending(ConnData2);
+                    error ->
+                        %% Pending limit:
+                        %% In this (granted, highly hypothetical case)
+                        %% we would make the user very confused if we 
+                        %% called the abort callback function, since 
+                        %% the request callback function has not yet
+                        %% been called. Alas, we skip this call here.
+                        send_pending_limit_error(ConnData);
+                    aborted ->
+                        ignore
+                end,
 	    prepare_autoconnecting_trans(ConnData2, Rest, AckList, ReqList, 
 					 Extra);
 	_ ->
@@ -1251,8 +1252,8 @@ prepare_request(ConnData, T, Rest, AckList, ReqList, Extra) ->
 		    ?report_debug(ConnData, 
 				  "prepare request: conflicting requests", 
 				  [TransId]),
-		    send_pending(ConnData),
-		    megaco_monitor:cancel_apply_after(PendingRef),
+		    _ = send_pending(ConnData),
+		    _ = megaco_monitor:cancel_apply_after(PendingRef),
 		    prepare_normal_trans(ConnData, Rest, AckList, ReqList, 
 					 Extra)
 	    end;
@@ -1294,7 +1295,7 @@ prepare_request(ConnData, T, Rest, AckList, ReqList, Extra) ->
 		    %% 
 		    %% ------------------------------------------
 
-		    send_pending(ConnData),
+		    _ = send_pending(ConnData),
 		    prepare_normal_trans(ConnData, Rest, AckList, ReqList, 
 					 Extra);
 
@@ -1330,8 +1331,8 @@ prepare_request(ConnData, T, Rest, AckList, ReqList, Extra) ->
 		    %% State == prepare:
 		    %%   The user does not know about this request
 		    %%   so we can safely perform cleanup.
-		    %% 
-		    megaco_monitor:cancel_apply_after(Ref),
+		    %%
+		    _ = megaco_monitor:cancel_apply_after(Ref),
 		    send_pending_limit_error(ConnData),
 		    if 
 			State == eval_request ->
@@ -1682,7 +1683,7 @@ do_handle_request(AckAction, {ok, Bin}, ConnData, TransId)
 	    %%   - Delete the pending counter
 	    %% 
 
-	    megaco_monitor:cancel_apply_after(PendingRef),
+	    _ = megaco_monitor:cancel_apply_after(PendingRef),
 	    megaco_config:del_pending_counter(sent, TransId),
 
 	    Method = timer_method(AckAction),
@@ -1725,7 +1726,7 @@ do_handle_request(AckAction, {ok, {Sent, NotSent}}, ConnData, TransId)
 	    %%   - Delete the pending counter
 	    %% 
 
-	    megaco_monitor:cancel_apply_after(PendingRef),
+	    _ = megaco_monitor:cancel_apply_after(PendingRef),
 	    megaco_config:del_pending_counter(sent, TransId),
 
 	    Method = timer_method(AckAction),
@@ -2178,7 +2179,7 @@ handle_recv_pending(#conn_data{long_request_resend = LRR,
     %% We can now drop the "bytes", since we will
     %% not resend from now on.
     
-    megaco_monitor:cancel_apply_after(Ref),
+    _ = megaco_monitor:cancel_apply_after(Ref),
     {WaitFor, CurrTimer} = megaco_timer:init(InitTimer),
     ConnHandle = ConnData#conn_data.conn_handle,
     M = ?MODULE,
@@ -2234,7 +2235,7 @@ handle_recv_pending(#conn_data{conn_handle = ConnHandle} = ConnData, TransId,
     %% We just need to recalculate the timer, i.e. 
     %% increment the timer (one "slot" has been consumed).
     
-    megaco_monitor:cancel_apply_after(Ref),
+    _ = megaco_monitor:cancel_apply_after(Ref),
     {WaitFor, Timer2} = megaco_timer:restart(CurrTimer),
     ConnHandle = ConnData#conn_data.conn_handle,
     M = ?MODULE,
@@ -2256,12 +2257,12 @@ handle_recv_pending_error(ConnData, TransId, Req, T, Extra) ->
     megaco_monitor:delete_request(TransId),
 
     %% 2) Possibly cancel the timer
-    case Req#request.timer_ref of
-	{_, Ref} ->
-	    megaco_monitor:cancel_apply_after(Ref);
-	_ ->
-	    ok
-    end,
+    _ = case Req#request.timer_ref of
+            {_, Ref} ->
+                megaco_monitor:cancel_apply_after(Ref);
+            _ ->
+                ok
+        end,
     
     %% 3) Delete the (receive) pending counter
     megaco_config:del_pending_counter(recv, TransId),
@@ -2310,10 +2311,10 @@ handle_reply(
 			  [T]),
 
 	    %% Stop the request timer
-            megaco_monitor:cancel_apply_after(Ref), %% OTP-4843
+            _ = megaco_monitor:cancel_apply_after(Ref), %% OTP-4843
 
 	    %% Acknowledge the segment
-	    send_segment_reply(ConnData, SN),
+	    _ = send_segment_reply(ConnData, SN),
 
 	    %% First segment for this reply
 	    NewFields = 
@@ -2353,7 +2354,7 @@ handle_reply(
 			  [T]),
 
 	    %% Acknowledge the segment
-	    send_segment_reply(ConnData, SN),
+	    _ = send_segment_reply(ConnData, SN),
 
 	    %% Updated/handle received segment
 	    case lists:member(SN, Segs) of
@@ -2400,7 +2401,7 @@ handle_reply(
 			  [T]),
 
 	    %% Acknowledge the segment
-	    send_segment_reply(ConnData, SN),
+	    _ = send_segment_reply(ConnData, SN),
 
 	    %% Updated received segments
 	    case lists:member(SN, Segs) of 
@@ -2413,9 +2414,9 @@ handle_reply(
 		    Last = 
 			case is_all_segments([SN | Segs]) of
 			    {true, _Sorted} ->
-				megaco_monitor:cancel_apply_after(SegRef),
+				_ = megaco_monitor:cancel_apply_after(SegRef),
 				megaco_monitor:delete_request(TransId),
-				send_ack(ConnData),
+				_ = send_ack(ConnData),
 				true;
 			    {false, Sorted} ->
 				megaco_monitor:update_request_field(TransId,
@@ -2477,10 +2478,10 @@ handle_reply(
 			  "first/complete seg", [T]),
 
 	    %% Stop the request timer
-            megaco_monitor:cancel_apply_after(Ref), %% OTP-4843
+            _ = megaco_monitor:cancel_apply_after(Ref), %% OTP-4843
 
 	    %% Acknowledge the ("last") segment
-	    send_segment_reply_complete(ConnData, SN),
+	    _ = send_segment_reply_complete(ConnData, SN),
 
 	    %% It is ofcourse pointless to split
 	    %% a transaction into just one segment,
@@ -2508,7 +2509,7 @@ handle_reply(
 		    true ->
 			%% Just one segment!
 			megaco_monitor:delete_request(TransId),
-			send_ack(ConnData),
+			_ = send_ack(ConnData),
 			true
 		end,
 	    
@@ -2537,7 +2538,7 @@ handle_reply(
 			  [T]),
 
 	    %% Acknowledge the ("last") segment
-	    send_segment_reply_complete(ConnData, SN),
+	    _ = send_segment_reply_complete(ConnData, SN),
 
 	    %% Updated received segments
 	    %% This is _probably_ the last segment, but some of
@@ -2555,7 +2556,7 @@ handle_reply(
 					      "[segmented] trans reply - "
 					      "complete set", [T]),
 				megaco_monitor:delete_request(TransId),
-				send_ack(ConnData),
+				_ = send_ack(ConnData),
 				true;
 			    {false, Sorted} ->
 				ConnHandle = ConnData#conn_data.conn_handle,
@@ -2736,11 +2737,11 @@ do_handle_reply(CD,
     %% This is the first reply (maybe of many)
     megaco_monitor:delete_request(TransId),
     megaco_monitor:request_lockcnt_del(TransId), 
-    megaco_monitor:cancel_apply_after(Ref),           % OTP-4843
+    _ = megaco_monitor:cancel_apply_after(Ref),           % OTP-4843
     megaco_config:del_pending_counter(recv, TransId), % OTP-7189
 
     %% Send acknowledgement
-    maybe_send_ack(T#megaco_transaction_reply.immAckRequired, CD),
+    _ = maybe_send_ack(T#megaco_transaction_reply.immAckRequired, CD),
 
     UserReply =
 	case T#megaco_transaction_reply.transactionResult of
@@ -2778,7 +2779,7 @@ do_handle_reply(CD,
 	    %% This *is* the first reply!!
 	    %% 1) Stop resend timer
 	    {_Type, Ref} = Req#request.timer_ref,             % OTP-4843
-	    megaco_monitor:cancel_apply_after(Ref),           % OTP-4843
+	    _ = megaco_monitor:cancel_apply_after(Ref),           % OTP-4843
 	
 	    %% 2) Delete pending counter
 	    megaco_config:del_pending_counter(recv, TransId), % OTP-7189
@@ -2793,7 +2794,7 @@ do_handle_reply(CD,
 						RKAWaitFor), 
 
 	    %% 4) Maybe send acknowledgement (three-way-handshake)
-	    maybe_send_ack(T#megaco_transaction_reply.immAckRequired, CD),
+	    _ = maybe_send_ack(T#megaco_transaction_reply.immAckRequired, CD),
 
 	    %% 5) And finally store the updated request record
 	    Req2 = Req#request{keep_alive_ref = RKARef},
@@ -2869,11 +2870,11 @@ handle_segment_reply(CD,
 	    handle_segment_reply_callback(CD, TransId, SN, SC, Extra),
 	    case lists:keysearch(SN, 1, Sent) of
 		{value, {SN, _Bin, SegTmr}} ->
-		    megaco_monitor:cancel_apply_after(SegTmr), %% BMK BMK
+		    _ = megaco_monitor:cancel_apply_after(SegTmr), %% BMK BMK
 		    case lists:keydelete(SN, 1, Sent) of
 			[] ->  %% We are done
 			    Ref = Rep#reply.timer_ref, 
-			    megaco_monitor:cancel_apply_after(Ref),
+			    _ = megaco_monitor:cancel_apply_after(Ref),
 			    megaco_monitor:update_reply_field(TransId2, 
 							      #reply.bytes,
 							      []),
@@ -2896,7 +2897,7 @@ handle_segment_reply(CD,
 	    handle_segment_reply_callback(CD, TransId, SN, SC, Extra),
 	    case lists:keysearch(SN, 1, Sent) of
 		{value, {SN, _Bin, SegTmr}} ->
-		    megaco_monitor:cancel_apply_after(SegTmr), %% BMK BMK
+		    _ = megaco_monitor:cancel_apply_after(SegTmr), %% BMK BMK
 		    NewSent = lists:keydelete(SN, 1, Sent),
 		    [{SN2, Bin2}|NewNotSent] = NotSent,
 		    case send_reply_segment(CD, "send trans reply segment", 
@@ -3026,14 +3027,14 @@ handle_ack(ConnData, OrigAckStatus,
     handle_ack_callback(ConnData, AckStatus, AckAction, T, Extra).
 
 handle_ack_cleanup(TransId, ReplyRef, PendingRef) ->
-    megaco_monitor:cancel_apply_after(ReplyRef),
-    megaco_monitor:cancel_apply_after(PendingRef),
+    _ = megaco_monitor:cancel_apply_after(ReplyRef),
+    _ = megaco_monitor:cancel_apply_after(PendingRef),
     megaco_monitor:delete_reply(TransId),
     megaco_config:del_pending_counter(sent, TransId). %% BMK: Still existing?
     
 cancel_segment_timers(SegSent) when is_list(SegSent) ->
     Cancel = fun({_, _, Ref}) ->
-		     megaco_monitor:cancel_apply_after(Ref)
+                     megaco_monitor:cancel_apply_after(Ref)
 	     end,
     lists:foreach(Cancel, SegSent);
 cancel_segment_timers(_) ->
@@ -4033,7 +4034,7 @@ send_reply(#conn_data{serial       = Serial,
 	{ok, Bin} when is_binary(Bin) andalso (TransReq =:= true) ->
 	    ?rt2("send_reply - pass it on to the transaction sender", 
 		 [size(Bin)]),
-	    megaco_trans_sender:send_reply(TransSnd, Bin),
+	    _ = megaco_trans_sender:send_reply(TransSnd, Bin),
 	    {ok, Bin};
 
         {ok, Bin} when is_binary(Bin) ->
@@ -4070,7 +4071,7 @@ send_reply(#conn_data{serial       = Serial,
 	    error_msg("failed encoding transaction reply body: ~s", 
 		      [format_encode_error_reason(Reason)]),
             Body = {transactions, [{transactionReply, TR3}]},
-            megaco_messenger_misc:send_body(CD, TraceLabel, Body),
+            _ = megaco_messenger_misc:send_body(CD, TraceLabel, Body),
 	    Error
     end.
 
@@ -4457,7 +4458,7 @@ do_receive_reply_remote(ConnData, TransId,
 			UserReply, Extra) ->
     megaco_monitor:delete_request(TransId),
     megaco_monitor:request_lockcnt_del(TransId), 
-    megaco_monitor:cancel_apply_after(Ref),           % OTP-4843
+    _ = megaco_monitor:cancel_apply_after(Ref),           % OTP-4843
     megaco_config:del_pending_counter(recv, TransId), % OTP-7189
 
     ConnData2 = ConnData#conn_data{user_mod     = UserMod,
@@ -4471,7 +4472,7 @@ cancel_reply(ConnData, #reply{state     = waiting_for_ack,
 			      user_mod  = UserMod,
 			      user_args = UserArgs} = Rep, Reason) ->
     ?report_trace(ignore, "cancel reply [waiting_for_ack]", [Rep]),
-    megaco_monitor:cancel_apply_after(Rep#reply.pending_timer_ref),
+    _ = megaco_monitor:cancel_apply_after(Rep#reply.pending_timer_ref),
     Serial = (Rep#reply.trans_id)#trans_id.serial,
     ConnData2 = ConnData#conn_data{serial    = Serial,
 				   user_mod  = UserMod,
@@ -4486,8 +4487,8 @@ cancel_reply(_ConnData, #reply{state = aborted} = Rep, _Reason) ->
 	   timer_ref         = ReplyRef,
 	   pending_timer_ref = PendingRef} = Rep,
     megaco_monitor:delete_reply(TransId),
-    megaco_monitor:cancel_apply_after(ReplyRef),
-    megaco_monitor:cancel_apply_after(PendingRef),     % Still running?
+    _ = megaco_monitor:cancel_apply_after(ReplyRef),
+    _ = megaco_monitor:cancel_apply_after(PendingRef),     % Still running?
     megaco_config:del_pending_counter(sent, TransId),  % Still existing?
     ok;
 
@@ -4497,8 +4498,8 @@ cancel_reply(_ConnData, Rep, ignore) ->
 	   timer_ref         = ReplyRef,
 	   pending_timer_ref = PendingRef} = Rep,
     megaco_monitor:delete_reply(TransId),
-    megaco_monitor:cancel_apply_after(ReplyRef),
-    megaco_monitor:cancel_apply_after(PendingRef),     % Still running?
+    _ = megaco_monitor:cancel_apply_after(ReplyRef),
+    _ = megaco_monitor:cancel_apply_after(PendingRef),     % Still running?
     megaco_config:del_pending_counter(sent, TransId),  % Still existing?
     ok;
 
@@ -4508,7 +4509,7 @@ cancel_reply(_CD, _Rep, _Reason) ->
 
 request_keep_alive_timeout(ConnHandle, TransId) ->
     megaco_config:del_pending_counter(ConnHandle, TransId), 
-    megaco_monitor:lookup_request(TransId),
+    _ = megaco_monitor:lookup_request(TransId),
     ok.
 
     
@@ -4853,7 +4854,7 @@ handle_reply_timer_timeout(ConnHandle, TransId) ->
 	{_Converted, 
 	 #reply{pending_timer_ref = Ref,              % aborted?
 		bytes             = SegSent}} ->      % may be a binary
-	    megaco_monitor:cancel_apply_after(Ref),
+	    _ = megaco_monitor:cancel_apply_after(Ref),
 	    cancel_segment_timers(SegSent), 
 	    megaco_monitor:delete_reply(TransId),
 	    megaco_config:del_pending_counter(sent, TransId);
@@ -4979,7 +4980,7 @@ handle_pending_timeout(CD, TransId, Timer) ->
 		    %% 
 		    %% ---------------------------------------------
 
-		    send_pending(CD),
+		    _ = send_pending(CD),
 		    case Timer of
 			timeout ->
 			    %% We are done
diff --git a/lib/megaco/src/engine/megaco_monitor.erl b/lib/megaco/src/engine/megaco_monitor.erl
index efda4d3716..34bd3a6706 100644
--- a/lib/megaco/src/engine/megaco_monitor.erl
+++ b/lib/megaco/src/engine/megaco_monitor.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2000-2020. All Rights Reserved.
+%% Copyright Ericsson AB 2000-2022. 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.
@@ -232,8 +232,8 @@ cast(Msg) ->
 init([Parent]) ->
     ?d("init -> entry", []),
     process_flag(trap_exit, true),
-    ets:new(megaco_requests, [public, named_table, {keypos, 2}]),
-    ets:new(megaco_replies,  [public, named_table, {keypos, 2}]),
+    _ = ets:new(megaco_requests, [public, named_table, {keypos, 2}]),
+    _ = ets:new(megaco_replies,  [public, named_table, {keypos, 2}]),
     ?d("init -> done", []),
     {ok, #state{parent_pid = Parent}}.
 
diff --git a/lib/megaco/src/engine/megaco_stats.erl b/lib/megaco/src/engine/megaco_stats.erl
index 1ca9faedb4..bf9d790074 100644
--- a/lib/megaco/src/engine/megaco_stats.erl
+++ b/lib/megaco/src/engine/megaco_stats.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 2002-2016. All Rights Reserved.
+%% Copyright Ericsson AB 2002-2022. 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.
@@ -48,7 +48,7 @@ init(Name) ->
     init(Name, []).
 
 init(Name, GlobalCounters) ->
-    ets:new(Name, [public, named_table, {keypos, 1}]),
+    _ = ets:new(Name, [public, named_table, {keypos, 1}]),
     ets:insert(Name, {global_counters, GlobalCounters}),
     create_global_snmp_counters(Name, GlobalCounters).
 
diff --git a/lib/megaco/src/engine/megaco_trans_sender.erl b/lib/megaco/src/engine/megaco_trans_sender.erl
index 871a074171..4bb96e1cf4 100644
--- a/lib/megaco/src/engine/megaco_trans_sender.erl
+++ b/lib/megaco/src/engine/megaco_trans_sender.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 2003-2016. All Rights Reserved.
+%% Copyright Ericsson AB 2003-2022. 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.
@@ -162,12 +162,12 @@ loop(#state{reqs = [], acks = [], timeout = Timeout} = S, _) ->
 
 	{send_ack_now, Serial} ->
 	    ?d("loop(empty) -> received send_ack_now [~w] request", [Serial]),
-	    send_msg(S#state.conn_handle, [], [Serial]),
+	    _ = send_msg(S#state.conn_handle, [], [Serial]),
 	    loop(S, Timeout);
 
 	{send_req, Tid, Req} when size(Req) >= S#state.req_maxsize ->
 	    ?d("loop(empty) -> received (big) send_req request ~w", [Tid]),
-	    send_msg(S#state.conn_handle, [{Tid, Req}], []),
+	    _ = send_msg(S#state.conn_handle, [{Tid, Req}], []),
 	    loop(S, Timeout);
 
 	{send_req, Tid, Req} ->
@@ -691,7 +691,7 @@ system_continue(_Parent, _Dbg, {S,To}) ->
 
 system_terminate(Reason, _Parent, _Dbg, {S, _}) ->
     #state{conn_handle = CH, reqs = Reqs, acks = Acks} = S,
-    send_msg(CH, Reqs, Acks),
+    _ = send_msg(CH, Reqs, Acks),
     exit(Reason).
 
 system_code_change(S, _Module, _OLdVsn, _Extra) ->
diff --git a/lib/megaco/src/flex/megaco_flex_scanner.erl b/lib/megaco/src/flex/megaco_flex_scanner.erl
index 174d430fb2..74f63b6ee3 100644
--- a/lib/megaco/src/flex/megaco_flex_scanner.erl
+++ b/lib/megaco/src/flex/megaco_flex_scanner.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 2001-2020. All Rights Reserved.
+%% Copyright Ericsson AB 2001-2022. 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.
@@ -32,10 +32,12 @@
 -define(SMP_SUPPORT_DEFAULT(), erlang:system_info(smp_support)).
 
 -dialyzer({nowarn_function, is_enabled/0}).
+-spec is_enabled() -> boolean().
 is_enabled() -> 
     (true =:= ?ENABLE_MEGACO_FLEX_SCANNER).
 
 -dialyzer({nowarn_function, is_reentrant_enabled/0}).
+-spec is_reentrant_enabled() -> boolean().
 is_reentrant_enabled() ->
     (true =:= ?MEGACO_REENTRANT_FLEX_SCANNER).
 
@@ -72,7 +74,7 @@ start(SMP) when ((SMP =:= true) orelse (SMP =:= false)) ->
 
 do_start(SMP) ->
     Path = lib_dir(),
-    erl_ddll:start(), 
+    _ = erl_ddll:start(), 
     load_driver(Path),
     PortOrPorts = open_drv_port(SMP),
     {ok, PortOrPorts}.
@@ -117,7 +119,7 @@ open_drv_port() ->
 	Port when is_port(Port) ->
 	    Port;
 	{'EXIT', Reason} ->
-	    erl_ddll:unload_driver(drv_name()),
+	    _ = erl_ddll:unload_driver(drv_name()),
 	    throw({error, {open_port, Reason}})
     end.
 
@@ -136,13 +138,13 @@ drv_name() ->
 
 stop(Port) when is_port(Port) ->
     erlang:port_close(Port), 
-    erl_ddll:unload_driver(drv_name()),
+    _ = erl_ddll:unload_driver(drv_name()),
     stopped;
 stop(Ports) when is_tuple(Ports) ->
     stop(tuple_to_list(Ports));
 stop(Ports) when is_list(Ports) ->
     lists:foreach(fun(Port) ->  erlang:port_close(Port) end, Ports),
-    erl_ddll:unload_driver(drv_name()),
+    _ = erl_ddll:unload_driver(drv_name()),
     stopped.
 
 
diff --git a/lib/megaco/src/tcp/megaco_tcp.erl b/lib/megaco/src/tcp/megaco_tcp.erl
index 6ff8e5793f..7fa7c24375 100644
--- a/lib/megaco/src/tcp/megaco_tcp.erl
+++ b/lib/megaco/src/tcp/megaco_tcp.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 1999-2021. All Rights Reserved.
+%% Copyright Ericsson AB 1999-2022. 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.
@@ -205,7 +205,7 @@ connect(SupPid, Parameters) ->
 			{ok, Pid} ->
 			    ?d1("connect -> connection started: "
 				"~n   Pid: ~p", [Pid]),
-			    gen_tcp:controlling_process(Socket, Pid),
+			    _ = gen_tcp:controlling_process(Socket, Pid),
 			    ?d2("connect -> control transferred"),
 			    {ok, Socket, Pid};
 			{error, Reason} ->
@@ -249,13 +249,13 @@ send_message(Socket, Data) ->
 	"~n   size(Data): ~p", [Socket, sz(Data)]),
     {Size, NewData} = add_tpkt_header(Data),
     Res = gen_tcp:send(Socket, NewData),
-    case Res of
-	ok ->
-	    incNumOutMessages(Socket),
-	    incNumOutOctets(Socket, Size);
-	_ ->
-	    ok
-    end,
+    _ = case Res of
+            ok ->
+                incNumOutMessages(Socket),
+                incNumOutOctets(Socket, Size);
+            _ ->
+                ok
+        end,
     Res.
 	    
 -ifdef(megaco_debug).
diff --git a/lib/megaco/src/tcp/megaco_tcp_connection.erl b/lib/megaco/src/tcp/megaco_tcp_connection.erl
index 136bfda2e5..0e5ea69066 100644
--- a/lib/megaco/src/tcp/megaco_tcp_connection.erl
+++ b/lib/megaco/src/tcp/megaco_tcp_connection.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 1999-2016. All Rights Reserved.
+%% Copyright Ericsson AB 1999-2022. 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.
@@ -146,7 +146,7 @@ handle_info({tcp, Socket, <<3:8, _X:8, Length:16, Msg/binary>>},
     incNumInMessages(Socket),
     incNumInOctets(Socket, 4+size(Msg)),
     apply(Mod, receive_message, [RH, self(), Socket, Msg]),
-    inet:setopts(Socket, [{active, once}]),
+    _ = inet:setopts(Socket, [{active, once}]),
     {noreply, TcpRec};
 handle_info({tcp, Socket, <<3:8, _X:8, Length:16, Msg/binary>>}, 
 	    #megaco_tcp{socket = Socket, serialize = false} = TcpRec) ->
@@ -154,7 +154,7 @@ handle_info({tcp, Socket, <<3:8, _X:8, Length:16, Msg/binary>>},
     incNumInMessages(Socket),
     incNumInOctets(Socket, 4+size(Msg)),
     receive_message(Mod, RH, Socket, Length, Msg),
-    inet:setopts(Socket, [{active, once}]),
+    _ = inet:setopts(Socket, [{active, once}]),
     {noreply, TcpRec};
 handle_info({tcp, Socket, <<3:8, _X:8, _Length:16, Msg/binary>>},
             #megaco_tcp{socket = Socket, serialize = true} = TcpRec) ->
@@ -162,7 +162,7 @@ handle_info({tcp, Socket, <<3:8, _X:8, _Length:16, Msg/binary>>},
     incNumInMessages(Socket),
     incNumInOctets(Socket, 4+size(Msg)),
     process_received_message(Mod, RH, Socket, Msg),
-    inet:setopts(Socket, [{active, once}]),
+    _ = inet:setopts(Socket, [{active, once}]),
     {noreply, TcpRec};
 handle_info({tcp, Socket, Msg}, TcpRec) ->
     incNumErrors(Socket),
@@ -188,8 +188,8 @@ process_received_message(Mod, RH, SH, Msg) ->
 
 receive_message(Mod, RH, SendHandle, Length, Msg) ->
     Opts = [link , {min_heap_size, ?HEAP_SIZE(Length)}],
-    spawn_opt(?MODULE, handle_received_message,
-	      [Mod, RH, self(), SendHandle, Msg], Opts),
+    _ = spawn_opt(?MODULE, handle_received_message,
+                  [Mod, RH, self(), SendHandle, Msg], Opts),
     ok.
 
 
diff --git a/lib/megaco/src/udp/megaco_udp.erl b/lib/megaco/src/udp/megaco_udp.erl
index 099f4b7455..02ac6554a0 100644
--- a/lib/megaco/src/udp/megaco_udp.erl
+++ b/lib/megaco/src/udp/megaco_udp.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 1999-2021. All Rights Reserved.
+%% Copyright Ericsson AB 1999-2022. 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.
@@ -129,7 +129,7 @@ open(SupPid, Options) ->
 		    NewUdpRec = UdpRec#megaco_udp{socket = Socket},
 		    case start_udp_server(SupPid, NewUdpRec) of
 			{ok, ControlPid} ->
-			    gen_udp:controlling_process(Socket, ControlPid),
+			    _ = gen_udp:controlling_process(Socket, ControlPid),
 			    {ok, Socket, ControlPid};
 			{error, Reason} ->
 			    Error = {error, {could_not_start_udp_server, Reason}},
@@ -220,13 +220,13 @@ create_snmp_counters(SH, [Counter|Counters]) ->
 send_message(SH, Data) when is_record(SH, send_handle) ->
     #send_handle{socket = Socket, addr = Addr, port = Port} = SH,
     Res = gen_udp:send(Socket, Addr, Port, Data),
-    case Res of
-	ok ->
-	    incNumOutMessages(SH),
-	    incNumOutOctets(SH, size(Data));
-	_ ->
-	    ok
-    end,
+    _ = case Res of
+            ok ->
+                incNumOutMessages(SH),
+                incNumOutOctets(SH, size(Data));
+            _ ->
+                ok
+        end,
     Res;
 send_message(SH, _Data) ->
     {error, {bad_send_handle, SH}}.
diff --git a/lib/megaco/src/udp/megaco_udp_server.erl b/lib/megaco/src/udp/megaco_udp_server.erl
index 5abb4165ae..60914083a0 100644
--- a/lib/megaco/src/udp/megaco_udp_server.erl
+++ b/lib/megaco/src/udp/megaco_udp_server.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 1999-2021. All Rights Reserved.
+%% Copyright Ericsson AB 1999-2022. 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.
@@ -162,7 +162,7 @@ handle_info({udp, _Socket, Ip, Port, Msg},
 	Sz ->
 	    receive_message(Mod, RH, SH, Sz, Msg)
     end,
-    activate(Socket),
+    _ = activate(Socket),
     {noreply, UdpRec};
 handle_info({udp, _Socket, Ip, Port, Msg}, 
 	    #megaco_udp{serialize = true} = UdpRec) ->
@@ -172,7 +172,7 @@ handle_info({udp, _Socket, Ip, Port, Msg},
     incNumInMessages(SH),
     incNumInOctets(SH, MsgSize),
     process_received_message(Mod, RH, SH, Msg),
-    activate(Socket),
+    _ = activate(Socket),
     {noreply, UdpRec};
 handle_info(Info, UdpRec) ->
     warning_msg("received unexpected info: "
-- 
2.35.3

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File 0425-megaco-Fixed-various-dialyzer-related-issues.patch of Package erlang (Revision 6de63e94d59bfadd1474930a5becda86)

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