1 files changed, 55 insertions, 0 deletions
diff --git a/lib/runtime_tools/src/ttb_autostart.erl b/lib/runtime_tools/src/ttb_autostart.erl
new file mode 100644
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+++ b/lib/runtime_tools/src/ttb_autostart.erl
@@ -0,0 +1,55 @@
+%%%-------------------------------------------------------------------
+%%% File    : ttb_autostart.erl
+%%% Author  : Bartłomiej Puzoń <[email protected]>
+%%% Description : This supervisor is used to resume ttb tracing
+%%% Users are able to provide custom restart modules for *_config, as
+%%% file:write/read/delete may not be possible on diskless nodes.
+%%%
+%%% Created : 31 Jul 2010 by <[email protected]>
+%%%-------------------------------------------------------------------
+-module(ttb_autostart).
+
+-behaviour(gen_server).
+
+%% API
+-export([start_link/0,
+         read_config/0,
+         write_config/1,
+         delete_config/0]).
+
+%% gen_server callbacks
+-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
+         terminate/2, code_change/3]).
+
+-define(DEF_AUTOSTART_MODULE, ?MODULE).
+-define(AUTOSTART_FILENAME, "ttb_autostart.bin").
+
+start_link() ->
+    gen_server:start_link(?MODULE, no_args, []).
+
+delete_config() ->
+    file:delete(?AUTOSTART_FILENAME).
+
+read_config() ->
+    case file:read_file(?AUTOSTART_FILENAME) of
+        {ok, Data} -> {ok, binary_to_term(Data)};
+        Error      -> Error
+    end.
+
+write_config(Data) ->
+    file:write_file(?AUTOSTART_FILENAME, term_to_binary(Data)).
+
+init(no_args) ->
+    case application:get_env(runtime_tools, ttb_autostart_module) of
+        {ok, _} ->  ok;
+        undefined -> application:set_env(runtime_tools, ttb_autostart_module, ?DEF_AUTOSTART_MODULE)
+    end,
+    observer_backend:ttb_resume_trace(),
+    %%As the process is not needed any more, it will shut itself down
+    {ok, no_args, 10000}.
+
+handle_call(_,_,_)       -> {noreply, no_args}.
+handle_cast(_,_)         -> {noreply, no_args}.
+handle_info(timeout,_)   -> {stop, normal, no_args}.
+terminate(_,_)           -> ok.
+code_change(_,_,_)       -> {ok, no_args}.