[snmp/agent] Improved loading and unload of MIBs

Improved the documentation of the loading and unloading
of MIBs (plural). also added functions for loading and
unloading a single mib.

OTP-11216

3 files changed, 95 insertions, 75 deletions

diff --git a/lib/snmp/test/snmp_agent_mibs_test.erl b/lib/snmp/test/snmp_agent_mibs_test.erl
index 248fe7d83e..f7dae64e3f 100644
--- a/lib/snmp/test/snmp_agent_mibs_test.erl
+++ b/lib/snmp/test/snmp_agent_mibs_test.erl
@@ -238,6 +238,8 @@ start_and_stop(Config) when is_list(Config) ->
 
 load_unload(suite) -> [];
 load_unload(Config) when is_list(Config) ->
+    ?DBG("load_unload -> start", []),
+
     Prio       = normal,
     Verbosity  = log,
     MibDir     = ?config(data_dir, Config),
@@ -253,8 +255,10 @@ load_unload(Config) when is_list(Config) ->
     ?line ok = load_mibs(MibsPid, MibDir, ["Test2"]),
     ?line ok = verify_loaded_mibs(MibsPid, MibDir, ["Test2"]),
     
-    ?DBG("load_unload -> load one already loaded mib", []),
-    ?line {error, _} = load_mibs(MibsPid, MibDir, ["Test2"]),
+    ?DBG("load_unload -> try load one *already loaded* mib", []),
+    EMib = join(MibDir, "Test2"), 
+    ?line {error, {'load aborted at', EMib, already_loaded}} = 
+	load_mibs(MibsPid, MibDir, ["Test2"]),
 
     ?DBG("load_unload -> load 2 not already loaded mibs", []),
     ?line ok = load_mibs(MibsPid, MibDir, ["TestTrap", "TestTrapv2"]),
@@ -266,7 +270,8 @@ load_unload(Config) when is_list(Config) ->
     ?line ok = verify_loaded_mibs(MibsPid, MibDir, ["TestTrap", "TestTrapv2"]),
     
     ?DBG("load_unload -> try unload two loaded mibs and one not loaded", []),
-    ?line {error, _} = unload_mibs(MibsPid, ["TestTrap","Test2","TestTrapv2"]),
+    ?line {error, {'unload aborted at', "Test2", not_loaded}} = 
+	   unload_mibs(MibsPid, ["TestTrap","Test2","TestTrapv2"]),
     ?line ok = verify_loaded_mibs(MibsPid, MibDir, ["TestTrapv2"]),
     
     ?DBG("load_unload -> unload the remaining loaded mib", []),
@@ -279,6 +284,7 @@ load_unload(Config) when is_list(Config) ->
     ?DBG("load_unload -> stop symbolic store", []),
     ?line sym_stop(),
 
+    ?DBG("load_unload -> done", []),
     ok.
 
 
@@ -691,10 +697,16 @@ mibs_info(Pid) ->
 
 load_mibs(Pid, Dir, Mibs0) ->
     Mibs = [join(Dir, Mib) || Mib <- Mibs0],
-    snmpa_mib:load_mibs(Pid, Mibs).
+    Res = snmpa_mib:load_mibs(Pid, Mibs),
+    %% ?DBG("load_mibs -> "
+    %% 	 "~n   Res: ~p", [Res]),
+    Res.
 
 unload_mibs(Pid, Mibs) ->
-    snmpa_mib:unload_mibs(Pid, Mibs).
+    Res = snmpa_mib:unload_mibs(Pid, Mibs),
+    %% ?DBG("unload_mibs -> "
+    %% 	 "~n   Res: ~p", [Res]),
+    Res.
 
 verify_loaded_mibs(Pid, Dir, ExpectedMibs0) ->
     ExpectedMibs = [join(Dir, Mib) || Mib <- ExpectedMibs0],
diff --git a/lib/snmp/test/snmp_agent_test.erl b/lib/snmp/test/snmp_agent_test.erl
index 6fe97ccd25..7e683e315a 100644
--- a/lib/snmp/test/snmp_agent_test.erl
+++ b/lib/snmp/test/snmp_agent_test.erl
@@ -554,7 +554,7 @@ init_per_suite(Config0) when is_list(Config0) ->
 
     %% Mib-dirs
     MibDir    = snmp_test_lib:lookup(data_dir, Config2),
-    StdMibDir = filename:join([code:priv_dir(snmp), "mibs"]),
+    StdMibDir = join([code:priv_dir(snmp), "mibs"]),
 
     Config3 = [{mib_dir, MibDir}, {std_mib_dir, StdMibDir} | Config2],
 
@@ -748,21 +748,21 @@ init_per_testcase2(Case, Config) ->
     CaseTopDir = snmp_test_lib:init_testcase_top_dir(Case, Config), 
 
     %% Create agent top-dir(s)
-    AgentTopDir = filename:join([CaseTopDir, agent]),
+    AgentTopDir = join([CaseTopDir, agent]),
     ok = file:make_dir(AgentTopDir),
-    AgentConfDir = filename:join([AgentTopDir, config]),
+    AgentConfDir = join([AgentTopDir, config]),
     ok = file:make_dir(AgentConfDir),
-    AgentDbDir = filename:join([AgentTopDir, db]),
+    AgentDbDir = join([AgentTopDir, db]),
     ok = file:make_dir(AgentDbDir),
-    AgentLogDir = filename:join([AgentTopDir, log]),
+    AgentLogDir = join([AgentTopDir, log]),
     ok = file:make_dir(AgentLogDir),
 
     %% Create sub-agent top-dir(s)
-    SubAgentTopDir = filename:join([CaseTopDir, sub_agent]),
+    SubAgentTopDir = join([CaseTopDir, sub_agent]),
     ok = file:make_dir(SubAgentTopDir),
 
     %% Create manager top-dir(s)
-    ManagerTopDir = filename:join([CaseTopDir, manager]),
+    ManagerTopDir = join([CaseTopDir, manager]),
     ok = file:make_dir(ManagerTopDir),
 
     [{case_top_dir,      CaseTopDir}, 
@@ -1738,19 +1738,19 @@ init_case(Config) ->
 load_master(Mib) ->
     ?DBG("load_master -> entry with"
 	"~n   Mib: ~p", [Mib]),
-    snmpa:unload_mibs(snmp_master_agent, [Mib]),	% Unload for safety
-    ok = snmpa:load_mibs(snmp_master_agent, [get(mib_dir) ++ Mib]).
+    snmpa:unload_mib(snmp_master_agent, Mib),	% Unload for safety
+    ok = snmpa:load_mib(snmp_master_agent, join(get(mib_dir), Mib)).
 
 load_master_std(Mib) ->
     ?DBG("load_master_std -> entry with"
 	"~n   Mib: ~p", [Mib]),
-    snmpa:unload_mibs(snmp_master_agent, [Mib]),	% Unload for safety
-    ok = snmpa:load_mibs(snmp_master_agent, [get(std_mib_dir) ++ Mib]).
+    snmpa:unload_mib(snmp_master_agent, Mib),	% Unload for safety
+    ok = snmpa:load_mib(snmp_master_agent, join(get(std_mib_dir), Mib)).
 
 unload_master(Mib) ->
     ?DBG("unload_master -> entry with"
 	"~n   Mib: ~p", [Mib]),
-    ok = snmpa:unload_mibs(snmp_master_agent, [Mib]).
+    ok = snmpa:unload_mib(snmp_master_agent, Mib).
 
 loaded_mibs() ->
     ?DBG("loaded_mibs -> entry",[]),
@@ -2155,11 +2155,11 @@ subagent(Config) when is_list(Config) ->
     try_test(unreg_test),
 
     ?P1("Loading previous subagent mib in master and testing..."),
-    ?line ok = snmpa:load_mibs(MA, [MibDir ++ "Klas1"]),
+    ?line ok = snmpa:load_mib(MA, join(MibDir, "Klas1")),
     try_test(load_test),
 
     ?P1("Unloading previous subagent mib in master and testing..."),
-    ?line ok = snmpa:unload_mibs(MA, [MibDir ++ "Klas1"]),
+    ?line ok = snmpa:unload_mib(MA, join(MibDir, "Klas1")),
     try_test(unreg_test),
     ?P1("Testing register subagent..."),
     rpc:call(SaNode, snmp, register_subagent,
@@ -2355,11 +2355,11 @@ sa_register(Config) when is_list(Config) ->
 
     ?P1("Unloading Klas1..."),
     ?DBG("sa_register -> unload mibs", []),
-    snmpa:unload_mibs(SA, [MibDir ++ "Klas1"]),
+    snmpa:unload_mib(SA, join(MibDir, "Klas1")),
 
     ?P1("Loading SA-MIB..."),
     ?DBG("sa_register -> unload mibs", []),
-    snmpa:load_mibs(SA, [MibDir ++ "SA-MIB"]),
+    snmpa:load_mib(SA, join(MibDir, "SA-MIB")),
     
     ?P1("register subagent..."),
     ?DBG("sa_register -> register subagent", []),
@@ -2578,7 +2578,7 @@ next_across_sa(Config) when is_list(Config) ->
     ?line {ok, SA} = start_subagent(SaNode, ?sa, "SA-MIB"),
 
     ?P1("Loading another subagent mib (Klas1)..."),
-    ?line ok = snmpa:load_mibs(SA, [MibDir ++ "Klas1"]),
+    ?line ok = snmpa:load_mib(SA, MibDir ++ "Klas1"),
 
     ?P1("register subagent..."), 
     rpc:call(SaNode, snmp, register_subagent, [MA, ?klas1, SA]),
@@ -2590,7 +2590,7 @@ next_across_sa(Config) when is_list(Config) ->
     try_test(next_across_sa_test),
 
     ?P1("Unloading mib (Klas1)"),
-    snmpa:unload_mibs(SA, [MibDir ++ "Klas1"]),
+    snmpa:unload_mib(SA, join(MibDir, "Klas1")),
     rpc:call(SaNode, snmp, unregister_subagent, [MA, ?klas1]),
     try_test(unreg_test),
 
@@ -2631,25 +2631,25 @@ undo(Config) when is_list(Config) ->
     ?line {ok, SA} = start_subagent(SaNode, ?sa, "SA-MIB"),
 
     ?P1("Load Klas3 & Klas4..."),
-    ?line ok = snmpa:load_mibs(MA, [MibDir ++ "Klas3"]),
-    ?line ok = snmpa:load_mibs(MA, [MibDir ++ "Klas4"]),
+    ?line ok = snmpa:load_mib(MA, join(MibDir, "Klas3")),
+    ?line ok = snmpa:load_mib(MA, join(MibDir, "Klas4")),
 
     ?P1("Testing undo phase at master agent..."),
     try_test(undo_test),
     try_test(api_test2),
 
     ?P1("Unload Klas3..."),
-    ?line ok = snmpa:unload_mibs(MA, [MibDir ++ "Klas3"]),
+    ?line ok = snmpa:unload_mib(MA, join(MibDir, "Klas3")),
 
     ?P1("Testing bad return values from instrum. funcs..."),
     try_test(bad_return),
 
     ?P1("Unload Klas4..."),
-    ?line ok = snmpa:unload_mibs(MA, [MibDir ++ "Klas4"]),
+    ?line ok = snmpa:unload_mib(MA, join(MibDir, "Klas4")),
 
     ?P1("Testing undo phase at subagent..."),
-    ?line ok = snmpa:load_mibs(SA, [MibDir ++ "Klas3"]),
-    ?line ok = snmpa:load_mibs(SA, [MibDir ++ "Klas4"]),
+    ?line ok = snmpa:load_mib(SA, join(MibDir, "Klas3")),
+    ?line ok = snmpa:load_mib(SA, join(MibDir, "Klas4")),
     ?line ok = snmpa:register_subagent(MA, ?klas3, SA),
     ?line ok = snmpa:register_subagent(MA, ?klas4, SA),
     try_test(undo_test),
@@ -6247,8 +6247,8 @@ otp_4394_config(AgentConfDir, MgrDir, Ip0) ->
 					     "OTP-4394 test"),
     ?line case update_usm(Vsn, AgentConfDir) of
 	true ->
-	    ?line copy_file(filename:join(AgentConfDir, "usm.conf"),
-			    filename:join(MgrDir, "usm.conf")),
+	    ?line copy_file(join(AgentConfDir, "usm.conf"),
+			    join(MgrDir, "usm.conf")),
 	    ?line update_usm_mgr(Vsn, MgrDir);
 	false ->
 	    ?line ok
@@ -6407,11 +6407,11 @@ otp8395({init, Config}) when is_list(Config) ->
     %% 
 
     AgentDbDir = ?config(agent_db_dir, Config),
-    AgentMnesiaDir = filename:join([AgentDbDir, "mnesia"]),
+    AgentMnesiaDir = join([AgentDbDir, "mnesia"]),
     mnesia_init(AgentNode, AgentMnesiaDir),
 
     %% SubAgentDir = ?config(sub_agent_dir, Config),
-    %% SubAgentMnesiaDir = filename:join([SubAgentDir, "mnesia"]),
+    %% SubAgentMnesiaDir = join([SubAgentDir, "mnesia"]),
     %% mnesia_init(SubAgentNode, SubAgentMnesiaDir),
 
     %% ok = mnesia_create_schema(AgentNode, [AgentNode, SubAgentNode]), 
@@ -6541,7 +6541,7 @@ otp8395(Config) when is_list(Config) ->
     ?SLEEP(1000),
     AgentNode   = ?config(agent_node, Config),
     AgentLogDir = ?config(agent_log_dir, Config),
-    OutFile     = filename:join([AgentLogDir, "otp8395.txt"]),
+    OutFile     = join([AgentLogDir, "otp8395.txt"]),
     {ok, LogInfo} = rpc:call(AgentNode, snmpa, log_info, []),
     ?DBG("otp8395 -> LogInfo: ~p", [LogInfo]), 
 
@@ -6579,7 +6579,7 @@ otp9884({init, Config}) when is_list(Config) ->
     %% 
 
     AgentDbDir = ?config(agent_db_dir, Config),
-    AgentMnesiaDir = filename:join([AgentDbDir, "mnesia"]),
+    AgentMnesiaDir = join([AgentDbDir, "mnesia"]),
     mnesia_init(AgentNode, AgentMnesiaDir),
 
     mnesia_create_schema(AgentNode, [AgentNode]),
@@ -6609,8 +6609,8 @@ otp9884({init, Config}) when is_list(Config) ->
     ManagerConfDir = ?config(manager_top_dir, Config),
     AgentConfDir   = ?config(agent_conf_dir, Config),
     AgentTopDir    = ?config(agent_top_dir, Config),
-    AgentBkpDir1   = filename:join([AgentTopDir, backup1]),
-    AgentBkpDir2   = filename:join([AgentTopDir, backup2]),
+    AgentBkpDir1   = join([AgentTopDir, backup1]),
+    AgentBkpDir2   = join([AgentTopDir, backup2]),
     ok = file:make_dir(AgentBkpDir1),
     ok = file:make_dir(AgentBkpDir2),
     AgentBkpDirs = [AgentBkpDir1, AgentBkpDir2], 
@@ -7105,7 +7105,7 @@ display_log(Config) ->
 		{value, {_, Node}} ->
 		    LogDir  = Dir, 
 		    Mibs    = [], 
-		    OutFile = filename:join(LogDir, "snmpa_log.txt"), 
+		    OutFile = join(LogDir, "snmpa_log.txt"), 
 		    p("~n"
 		      "========================="
 		      "  < Audit Trail Log >  "
@@ -7252,6 +7252,14 @@ lists_key1search(Key, List) when is_atom(Key) ->
 %% regs() ->
 %%     lists:sort(registered()).
 
+%% ------
+
+join(Parts) ->
+    filename:join(Parts).
+
+join(Dir, File) ->
+    filename:join(Dir, File).
+
 
 %% ------
 
diff --git a/lib/snmp/test/snmp_agent_test_lib.erl b/lib/snmp/test/snmp_agent_test_lib.erl
index 7e4b713e56..122289c28e 100644
--- a/lib/snmp/test/snmp_agent_test_lib.erl
+++ b/lib/snmp/test/snmp_agent_test_lib.erl
@@ -139,31 +139,31 @@ init_all(Config) when is_list(Config) ->
     SuiteTopDir = ?config(snmp_suite_top_dir, Config),
     ?DBG("init_all -> SuiteTopDir ~p", [SuiteTopDir]),
 
-    AgentDir = filename:join(SuiteTopDir, "agent/"), 
+    AgentDir = join(SuiteTopDir, "agent/"), 
     ?line ok = file:make_dir(AgentDir),
     ?DBG("init_all -> AgentDir ~p", [AgentDir]),
 
-    AgentDbDir = filename:join(AgentDir, "db/"), 
+    AgentDbDir = join(AgentDir, "db/"), 
     ?line ok   = file:make_dir(AgentDbDir),
     ?DBG("init_all -> AgentDbDir ~p", [AgentDbDir]),
 
-    AgentLogDir = filename:join(AgentDir, "log/"), 
+    AgentLogDir = join(AgentDir, "log/"), 
     ?line ok    = file:make_dir(AgentLogDir),
     ?DBG("init_all -> AgentLogDir ~p", [AgentLogDir]),
 
-    AgentConfDir = filename:join(AgentDir, "conf/"), 
+    AgentConfDir = join(AgentDir, "conf/"), 
     ?line ok     = file:make_dir(AgentConfDir),
     ?DBG("init_all -> AgentConfDir ~p", [AgentConfDir]),
 
-    MgrDir   = filename:join(SuiteTopDir, "mgr/"), 
+    MgrDir   = join(SuiteTopDir, "mgr/"), 
     ?line ok = file:make_dir(MgrDir),
     ?DBG("init_all -> MgrDir ~p", [MgrDir]),
 
-    SaDir    = filename:join(SuiteTopDir, "sa/"), 
+    SaDir    = join(SuiteTopDir, "sa/"), 
     ?line ok = file:make_dir(SaDir),
     ?DBG("init_all -> SaDir ~p", [SaDir]),
 
-    SaDbDir  = filename:join(SaDir, "db/"), 
+    SaDbDir  = join(SaDir, "db/"), 
     ?line ok = file:make_dir(SaDbDir),
     ?DBG("init_all -> SaDbDir ~p", [SaDbDir]),
 
@@ -183,11 +183,11 @@ init_all(Config) when is_list(Config) ->
     
     ?DBG("init_all -> application mnesia: set_env dir",[]),
     ?line application_controller:set_env(mnesia, dir, 
-					 filename:join(AgentDbDir, "Mnesia1")),
+					 join(AgentDbDir, "Mnesia1")),
 
     ?DBG("init_all -> application mnesia: set_env dir on node ~p",[SaNode]),
     ?line rpc:call(SaNode, application_controller, set_env, 
-		   [mnesia, dir,  filename:join(SaDir, "Mnesia2")]),
+		   [mnesia, dir,  join(SaDir, "Mnesia2")]),
 
     ?DBG("init_all -> create mnesia schema",[]),
     ?line ok = mnesia:create_schema([SaNode, node()]),
@@ -253,7 +253,7 @@ init_case(Config) when is_list(Config) ->
     
     MibDir = ?config(mib_dir, Config),
     put(mib_dir, MibDir),
-    StdM = filename:join(code:priv_dir(snmp), "mibs") ++ "/",
+    StdM = join(code:priv_dir(snmp), "mibs") ++ "/",
     put(std_mib_dir, StdM),
 
     MgrDir = ?config(mgr_dir, Config),
@@ -341,7 +341,7 @@ run(Mod, Func, Args, Opts) ->
     Crypto = ?CRYPTO_START(),
     ?DBG("run -> Crypto: ~p", [Crypto]),
     catch snmp_test_mgr:stop(), % If we had a running mgr from a failed case
-    StdM = filename:join(code:priv_dir(snmp), "mibs") ++ "/",
+    StdM = join(code:priv_dir(snmp), "mibs") ++ "/",
     Vsn = get(vsn), 
     ?DBG("run -> config:"
 	   "~n   M:           ~p"
@@ -763,7 +763,7 @@ start_subagent(SaNode, RegTree, Mib) ->
     MA = whereis(snmp_master_agent),
     ?DBG("start_subagent -> MA: ~p", [MA]),
     MibDir = get(mib_dir),
-    Mib1   = join(MibDir,Mib),
+    Mib1   = join(MibDir, Mib),
     Mod    = snmpa_supervisor,
     Func   = start_sub_agent,
     Args   = [MA, RegTree, [Mib1]], 
@@ -800,28 +800,25 @@ mibs(StdMibDir,MibDir) ->
      join(MibDir, "Test2.bin"),
      join(MibDir, "TestTrapv2.bin")].
 
-join(D,F) ->
-    filename:join(D,F).
-
 
 %% --- various mib load/unload functions ---
 
 load_master(Mib) ->
     ?DBG("load_master -> entry with"
 	"~n   Mib: ~p", [Mib]),
-    snmpa:unload_mibs(snmp_master_agent, [Mib]),	% Unload for safety
-    ok = snmpa:load_mibs(snmp_master_agent, [get(mib_dir) ++ Mib]).
+    snmpa:unload_mib(snmp_master_agent, Mib),	% Unload for safety
+    ok = snmpa:load_mib(snmp_master_agent, join(get(mib_dir), Mib)).
 
 load_master_std(Mib) ->
     ?DBG("load_master_std -> entry with"
 	"~n   Mib: ~p", [Mib]),
-    snmpa:unload_mibs(snmp_master_agent, [Mib]),	% Unload for safety
-    ok = snmpa:load_mibs(snmp_master_agent, [get(std_mib_dir) ++ Mib]).
+    snmpa:unload_mib(snmp_master_agent, Mib),	% Unload for safety
+    ok = snmpa:load_mibs(snmp_master_agent, join(get(std_mib_dir), Mib)).
 
 unload_master(Mib) ->
     ?DBG("unload_master -> entry with"
 	"~n   Mib: ~p", [Mib]),
-    ok = snmpa:unload_mibs(snmp_master_agent, [Mib]).
+    ok = snmpa:unload_mib(snmp_master_agent, Mib).
 
 loaded_mibs() ->
     ?DBG("loaded_mibs -> entry",[]),
@@ -1383,8 +1380,8 @@ config(Vsns, MgrDir, AgentConfDir, MIp, AIp) ->
  					     "test"),
     ?line case update_usm(Vsns, AgentConfDir) of
 	      true ->
-		  ?line copy_file(filename:join(AgentConfDir, "usm.conf"),
-				  filename:join(MgrDir, "usm.conf")),
+		  ?line copy_file(join(AgentConfDir, "usm.conf"),
+				  join(MgrDir, "usm.conf")),
 		  ?line update_usm_mgr(Vsns, MgrDir);
 	      false ->
 		  ?line ok
@@ -1403,9 +1400,9 @@ delete_files(Config) ->
 delete_files(_AgentFiles, []) ->
     ok;
 delete_files(AgentDir, [DirName|DirNames]) ->
-    Dir = filename:join(AgentDir, DirName),
+    Dir = join(AgentDir, DirName),
     {ok, Files} = file:list_dir(Dir),
-    lists:foreach(fun(FName) -> file:delete(filename:join(Dir, FName)) end,
+    lists:foreach(fun(FName) -> file:delete(join(Dir, FName)) end,
 		  Files),
     delete_files(AgentDir, DirNames).
 
@@ -1481,8 +1478,8 @@ update_usm_mgr(Vsns, Dir) ->
     end.
 
 rewrite_usm_mgr(Dir, ShaKey, DesKey) -> 
-    ?line ok = file:rename(filename:join(Dir,"usm.conf"),
-			   filename:join(Dir,"usm.old")),
+    ?line ok = file:rename(join(Dir,"usm.conf"),
+			   join(Dir,"usm.old")),
     Conf = [{"agentEngine", "newUser", "newUser", zeroDotZero, 
 	     usmHMACSHAAuthProtocol, "", "", 
 	     usmDESPrivProtocol, "", "", "", ShaKey, DesKey}, 
@@ -1492,8 +1489,8 @@ rewrite_usm_mgr(Dir, ShaKey, DesKey) ->
     ok = snmp_config:write_agent_usm_config(Dir, "", Conf).
 
 reset_usm_mgr(Dir) ->
-    ?line ok = file:rename(filename:join(Dir,"usm.old"),
-			   filename:join(Dir,"usm.conf")).
+    ?line ok = file:rename(join(Dir,"usm.old"),
+			   join(Dir,"usm.conf")).
 
 
 update_community([v3], _Dir) -> 
@@ -1526,7 +1523,7 @@ write_target_addr_conf(Dir, ManagerIp, UDP, Vsns) ->
 rewrite_target_addr_conf(Dir, NewPort) -> 
     ?DBG("rewrite_target_addr_conf -> entry with"
 	 "~n   NewPort: ~p", [NewPort]),
-    TAFile = filename:join(Dir, "target_addr.conf"),
+    TAFile = join(Dir, "target_addr.conf"),
     case file:read_file_info(TAFile) of
 	{ok, _} -> 
 	    ok;
@@ -1546,8 +1543,8 @@ rewrite_target_addr_conf(Dir, NewPort) ->
     
     ?DBG("rewrite_target_addr_conf -> NewAddrs: ~p",[NewAddrs]),
 
-    ?line ok = file:rename(filename:join(Dir,"target_addr.conf"),
-			   filename:join(Dir,"target_addr.old")),
+    ?line ok = file:rename(join(Dir,"target_addr.conf"),
+			   join(Dir,"target_addr.old")),
 
     ?line ok = snmp_config:write_agent_target_addr_config(Dir, "", NewAddrs).
 
@@ -1565,8 +1562,8 @@ rewrite_target_addr_conf2(_NewPort,O) ->
     O.
 
 reset_target_addr_conf(Dir) ->
-    ?line ok = file:rename(filename:join(Dir, "target_addr.old"),
-			   filename:join(Dir, "target_addr.conf")).
+    ?line ok = file:rename(join(Dir, "target_addr.old"),
+			   join(Dir, "target_addr.conf")).
 
 write_target_params_conf(Dir, Vsns) -> 
     F = fun(v1) -> {"target_v1", v1,  v1,  "all-rights", noAuthNoPriv};
@@ -1578,14 +1575,14 @@ write_target_params_conf(Dir, Vsns) ->
 
 rewrite_target_params_conf(Dir, SecName, SecLevel) 
   when is_list(SecName) andalso is_atom(SecLevel) -> 
-    ?line ok = file:rename(filename:join(Dir,"target_params.conf"),
-			   filename:join(Dir,"target_params.old")),
+    ?line ok = file:rename(join(Dir,"target_params.conf"),
+			   join(Dir,"target_params.old")),
     Conf = [{"target_v3", v3, usm, SecName, SecLevel}],
     snmp_config:write_agent_target_params_config(Dir, "", Conf).
 
 reset_target_params_conf(Dir) ->
-    ?line ok = file:rename(filename:join(Dir,"target_params.old"),
-			   filename:join(Dir,"target_params.conf")).
+    ?line ok = file:rename(join(Dir,"target_params.old"),
+			   join(Dir,"target_params.conf")).
 
 write_notify_conf(Dir) -> 
     Conf = [{"standard trap",   "std_trap",   trap}, 
@@ -1648,6 +1645,9 @@ rpc(Node, F, A) ->
     rpc:call(Node, snmpa, F, A).
 
 
+join(Dir, File) ->
+    filename:join(Dir, File).
+
 %% await_pdu(To) ->
 %%     await_response(To, pdu).
 %%