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-rw-r--r--lib/stdlib/src/sys.erl69
1 files changed, 59 insertions, 10 deletions
diff --git a/lib/stdlib/src/sys.erl b/lib/stdlib/src/sys.erl
index c186eab940..e25cc25f57 100644
--- a/lib/stdlib/src/sys.erl
+++ b/lib/stdlib/src/sys.erl
@@ -102,20 +102,31 @@ get_status(Name, Timeout) -> send_system_msg(Name, get_status, Timeout).
-spec get_state(Name) -> State when
Name :: name(),
State :: term().
-get_state(Name) -> send_system_msg(Name, get_state).
+get_state(Name) ->
+ case send_system_msg(Name, get_state) of
+ {error, Reason} -> error(Reason);
+ State -> State
+ end.
-spec get_state(Name, Timeout) -> State when
Name :: name(),
Timeout :: timeout(),
State :: term().
-get_state(Name, Timeout) -> send_system_msg(Name, get_state, Timeout).
+get_state(Name, Timeout) ->
+ case send_system_msg(Name, get_state, Timeout) of
+ {error, Reason} -> error(Reason);
+ State -> State
+ end.
-spec replace_state(Name, StateFun) -> NewState when
Name :: name(),
StateFun :: fun((State :: term()) -> NewState :: term()),
NewState :: term().
replace_state(Name, StateFun) ->
- send_system_msg(Name, {replace_state, StateFun}).
+ case send_system_msg(Name, {replace_state, StateFun}) of
+ {error, Reason} -> error(Reason);
+ State -> State
+ end.
-spec replace_state(Name, StateFun, Timeout) -> NewState when
Name :: name(),
@@ -123,7 +134,10 @@ replace_state(Name, StateFun) ->
Timeout :: timeout(),
NewState :: term().
replace_state(Name, StateFun, Timeout) ->
- send_system_msg(Name, {replace_state, StateFun}, Timeout).
+ case send_system_msg(Name, {replace_state, StateFun}, Timeout) of
+ {error, Reason} -> error(Reason);
+ State -> State
+ end.
-spec change_code(Name, Module, OldVsn, Extra) -> 'ok' | {error, Reason} when
Name :: name(),
@@ -317,10 +331,10 @@ handle_system_msg(Msg, From, Parent, Mod, Debug, Misc, Hib) ->
handle_system_msg(SysState, Msg, From, Parent, Mod, Debug, Misc, Hib) ->
case do_cmd(SysState, Msg, Parent, Mod, Debug, Misc) of
{suspended, Reply, NDebug, NMisc} ->
- gen:reply(From, Reply),
+ _ = gen:reply(From, Reply),
suspend_loop(suspended, Parent, Mod, NDebug, NMisc, Hib);
{running, Reply, NDebug, NMisc} ->
- gen:reply(From, Reply),
+ _ = gen:reply(From, Reply),
Mod:system_continue(Parent, NDebug, NMisc)
end.
@@ -390,10 +404,11 @@ do_cmd(_, suspend, _Parent, _Mod, Debug, Misc) ->
{suspended, ok, Debug, Misc};
do_cmd(_, resume, _Parent, _Mod, Debug, Misc) ->
{running, ok, Debug, Misc};
-do_cmd(SysState, get_state, _Parent, _Mod, Debug, {State, Misc}) ->
- {SysState, State, Debug, Misc};
-do_cmd(SysState, replace_state, _Parent, _Mod, Debug, {State, Misc}) ->
- {SysState, State, Debug, Misc};
+do_cmd(SysState, get_state, _Parent, Mod, Debug, Misc) ->
+ {SysState, do_get_state(Mod, Misc), Debug, Misc};
+do_cmd(SysState, {replace_state, StateFun}, _Parent, Mod, Debug, Misc) ->
+ {Res, NMisc} = do_replace_state(StateFun, Mod, Misc),
+ {SysState, Res, Debug, NMisc};
do_cmd(SysState, get_status, Parent, Mod, Debug, Misc) ->
Res = get_status(SysState, Parent, Mod, Debug, Misc),
{SysState, Res, Debug, Misc};
@@ -407,6 +422,40 @@ do_cmd(suspended, {change_code, Module, Vsn, Extra}, _Parent,
do_cmd(SysState, Other, _Parent, _Mod, Debug, Misc) ->
{SysState, {error, {unknown_system_msg, Other}}, Debug, Misc}.
+do_get_state(Mod, Misc) ->
+ case erlang:function_exported(Mod, system_get_state, 1) of
+ true ->
+ try
+ {ok, State} = Mod:system_get_state(Misc),
+ State
+ catch
+ Cl:Exc ->
+ {error, {callback_failed,{Mod,system_get_state},{Cl,Exc}}}
+ end;
+ false ->
+ Misc
+ end.
+
+do_replace_state(StateFun, Mod, Misc) ->
+ case erlang:function_exported(Mod, system_replace_state, 2) of
+ true ->
+ try
+ {ok, State, NMisc} = Mod:system_replace_state(StateFun, Misc),
+ {State, NMisc}
+ catch
+ Cl:Exc ->
+ {{error, {callback_failed,{Mod,system_replace_state},{Cl,Exc}}}, Misc}
+ end;
+ false ->
+ try
+ NMisc = StateFun(Misc),
+ {NMisc, NMisc}
+ catch
+ Cl:Exc ->
+ {{error, {callback_failed,StateFun,{Cl,Exc}}}, Misc}
+ end
+ end.
+
get_status(SysState, Parent, Mod, Debug, Misc) ->
PDict = get(),
FmtMisc =