handle {global, term()} names in format_status/2

The gen_fsm, gen_server, and wx_object format_status implementations
fail to handle global names of the form {global, term()} where term()
is something other than an atom, pid, or list. Change these
format_status implementations to treat names that are atoms, pids, or
lists as before, but for all other terms, set the header property of
the function return value to a tuple whose first element is a string
describing the return value and whose second element is the name term.

Add unit tests for gen_server and gen_fsm to verify sys:get_status
calls work successfully for globally registered instances.

5 files changed, 74 insertions, 21 deletions

diff --git a/lib/stdlib/src/gen_fsm.erl b/lib/stdlib/src/gen_fsm.erl
index 8d1b46d6ab..7d9960b912 100644
--- a/lib/stdlib/src/gen_fsm.erl
+++ b/lib/stdlib/src/gen_fsm.erl
@@ -614,12 +614,15 @@ get_msg(Msg) -> Msg.
 format_status(Opt, StatusData) ->
     [PDict, SysState, Parent, Debug, [Name, StateName, StateData, Mod, _Time]] =
 	StatusData,
-    NameTag = if is_pid(Name) ->
-		      pid_to_list(Name);
-		 is_atom(Name) ->
-		      Name
-	      end,
-    Header = lists:concat(["Status for state machine ", NameTag]),
+    StatusHdr = "Status for state machine",
+    Header = if
+		 is_pid(Name) ->
+		     lists:concat([StatusHdr, " ", pid_to_list(Name)]);
+		 is_atom(Name); is_list(Name) ->
+		     lists:concat([StatusHdr, " ", Name]);
+		 true ->
+		     {StatusHdr, Name}
+	     end,
     Log = sys:get_debug(log, Debug, []),
     DefaultStatus = [{data, [{"StateData", StateData}]}],
     Specfic =
diff --git a/lib/stdlib/src/gen_server.erl b/lib/stdlib/src/gen_server.erl
index dc8e7ecd16..ac81df9cab 100644
--- a/lib/stdlib/src/gen_server.erl
+++ b/lib/stdlib/src/gen_server.erl
@@ -840,12 +840,15 @@ name_to_pid(Name) ->
 %%-----------------------------------------------------------------
 format_status(Opt, StatusData) ->
     [PDict, SysState, Parent, Debug, [Name, State, Mod, _Time]] = StatusData,
-    NameTag = if is_pid(Name) ->
-		      pid_to_list(Name);
-		 is_atom(Name) ->
-		      Name
-	      end,
-    Header = lists:concat(["Status for generic server ", NameTag]),
+    StatusHdr = "Status for generic server",
+    Header = if
+		 is_pid(Name) ->
+		     lists:concat([StatusHdr, " ", pid_to_list(Name)]);
+		 is_atom(Name); is_list(Name) ->
+		     lists:concat([StatusHdr, " ", Name]);
+		 true ->
+		     {StatusHdr, Name}
+	     end,
     Log = sys:get_debug(log, Debug, []),
     DefaultStatus = [{data, [{"State", State}]}],
     Specfic =
diff --git a/lib/stdlib/test/gen_fsm_SUITE.erl b/lib/stdlib/test/gen_fsm_SUITE.erl
index d61eeb403b..dd120f8c05 100644
--- a/lib/stdlib/test/gen_fsm_SUITE.erl
+++ b/lib/stdlib/test/gen_fsm_SUITE.erl
@@ -320,9 +320,32 @@ sys1(Config) when is_list(Config) ->
 call_format_status(Config) when is_list(Config) ->
     ?line {ok, Pid} = gen_fsm:start(gen_fsm_SUITE, [], []),
     ?line Status = sys:get_status(Pid),
-    ?line {status, Pid, _Mod, [_PDict, running, _Parent, _, Data]} = Status,
+    ?line {status, Pid, _Mod, [_PDict, running, _, _, Data]} = Status,
     ?line [format_status_called | _] = lists:reverse(Data),
-    ?line stop_it(Pid).
+    ?line stop_it(Pid),
+
+    %% check that format_status can handle a name being an atom (pid is
+    %% already checked by the previous test)
+    ?line {ok, Pid2} = gen_fsm:start({local, gfsm}, gen_fsm_SUITE, [], []),
+    ?line Status2 = sys:get_status(gfsm),
+    ?line {status, Pid2, _Mod, [_PDict2, running, _, _, Data2]} = Status2,
+    ?line [format_status_called | _] = lists:reverse(Data2),
+    ?line stop_it(Pid2),
+
+    %% check that format_status can handle a name being a term other than a
+    %% pid or atom
+    GlobalName1 = {global, "CallFormatStatus"},
+    ?line {ok, Pid3} = gen_fsm:start(GlobalName1, gen_fsm_SUITE, [], []),
+    ?line Status3 = sys:get_status(GlobalName1),
+    ?line {status, Pid3, _Mod, [_PDict3, running, _, _, Data3]} = Status3,
+    ?line [format_status_called | _] = lists:reverse(Data3),
+    ?line stop_it(Pid3),
+    GlobalName2 = {global, {name, "term"}},
+    ?line {ok, Pid4} = gen_fsm:start(GlobalName2, gen_fsm_SUITE, [], []),
+    ?line Status4 = sys:get_status(GlobalName2),
+    ?line {status, Pid4, _Mod, [_PDict4, running, _, _, Data4]} = Status4,
+    ?line [format_status_called | _] = lists:reverse(Data4),
+    ?line stop_it(Pid4).
 
 error_format_status(Config) when is_list(Config) ->
     ?line error_logger_forwarder:register(),
@@ -345,7 +368,6 @@ error_format_status(Config) when is_list(Config) ->
     process_flag(trap_exit, OldFl),
     ok.
 
-
 %% Hibernation
 hibernate(suite) -> [];
 hibernate(Config) when is_list(Config) ->
diff --git a/lib/stdlib/test/gen_server_SUITE.erl b/lib/stdlib/test/gen_server_SUITE.erl
index 0966734c89..99388ba2e3 100644
--- a/lib/stdlib/test/gen_server_SUITE.erl
+++ b/lib/stdlib/test/gen_server_SUITE.erl
@@ -905,6 +905,28 @@ call_format_status(Config) when is_list(Config) ->
     ?line Status2 = sys:get_status(call_format_status, 5000),
     ?line {status, Pid, _Mod, [_PDict, running, _Parent, _, Data2]} = Status2,
     ?line [format_status_called | _] = lists:reverse(Data2),
+
+    %% check that format_status can handle a name being a pid (atom is
+    %% already checked by the previous test)
+    ?line {ok, Pid3} = gen_server:start_link(gen_server_SUITE, [], []),
+    ?line Status3 = sys:get_status(Pid3),
+    ?line {status, Pid3, _Mod, [_PDict3, running, _Parent, _, Data3]} = Status3,
+    ?line [format_status_called | _] = lists:reverse(Data3),
+
+    %% check that format_status can handle a name being a term other than a
+    %% pid or atom
+    GlobalName1 = {global, "CallFormatStatus"},
+    ?line {ok, Pid4} = gen_server:start_link(GlobalName1,
+					     gen_server_SUITE, [], []),
+    ?line Status4 = sys:get_status(Pid4),
+    ?line {status, Pid4, _Mod, [_PDict4, running, _Parent, _, Data4]} = Status4,
+    ?line [format_status_called | _] = lists:reverse(Data4),
+    GlobalName2 = {global, {name, "term"}},
+    ?line {ok, Pid5} = gen_server:start_link(GlobalName2,
+					     gen_server_SUITE, [], []),
+    ?line Status5 = sys:get_status(GlobalName2),
+    ?line {status, Pid5, _Mod, [_PDict5, running, _Parent, _, Data5]} = Status5,
+    ?line [format_status_called | _] = lists:reverse(Data5),
     ok.
 
 %% Verify that error termination correctly calls our format_status/2 fun
diff --git a/lib/wx/src/wx_object.erl b/lib/wx/src/wx_object.erl
index 71041ff558..bfd38960dd 100644
--- a/lib/wx/src/wx_object.erl
+++ b/lib/wx/src/wx_object.erl
@@ -605,12 +605,15 @@ dbg_opts(Name, Opts) ->
 %%-----------------------------------------------------------------
 format_status(Opt, StatusData) ->
     [PDict, SysState, Parent, Debug, [Name, State, Mod, _Time]] = StatusData,
-    NameTag = if is_pid(Name) ->
-		      pid_to_list(Name);
-		 is_atom(Name) ->
-		      Name
-	      end,
-    Header = lists:concat(["Status for generic server ", NameTag]),
+    StatusHdr = "Status for wx object ",
+    Header = if
+		 is_pid(Name) ->
+		     lists:concat([StatusHdr, pid_to_list(Name)]);
+		 is_atom(Name); is_list(Name) ->
+		     lists:concat([StatusHdr, Name]);
+		 true ->
+		     {StatusHdr, Name}
+	     end,
     Log = sys:get_debug(log, Debug, []),
     Specfic = 
 	case erlang:function_exported(Mod, format_status, 2) of