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.

2 files changed, 18 insertions, 12 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 =