1 files changed, 73 insertions, 0 deletions
diff --git a/erts/preloaded/src/erl_init.erl b/erts/preloaded/src/erl_init.erl
new file mode 100644
index 0000000000..dadf7dda6f
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+++ b/erts/preloaded/src/erl_init.erl
@@ -0,0 +1,73 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2000-2019. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(erl_init).
+
+%% Initial process of an Erlang system.
+
+-export([start/2]).
+
+%% This gets the module name given by the +i option (default 'init')
+%% and the list of command line arguments
+
+-spec start(Mod, BootArgs) -> no_return() when
+      Mod :: module(),
+      BootArgs :: [binary()].
+start(Mod, BootArgs) ->
+    %% Load the static nifs
+    zlib:on_load(),
+    erl_tracer:on_load(),
+    prim_buffer:on_load(),
+    prim_file:on_load(),
+    %% socket:on_load(), prim_net:on_load(),
+    conditional_load(socket, [socket, prim_net]),
+    %% Proceed to the specified boot module
+    run(Mod, boot, BootArgs).
+
+run(M, F, A) ->
+    case erlang:function_exported(M, F, 1) of
+	false ->
+	    erlang:display({fatal,error,module,M,"does not export",F,"/1"}),
+	    halt(1);
+	true ->
+            M:F(A)
+    end.
+
+conditional_load(CondMod, Mods2Load) ->
+    Loaded = erlang:loaded(),
+    %% erlang:display({?MODULE, conditional_load, Loaded}),
+    conditional_load(CondMod, Loaded, Mods2Load).
+
+conditional_load(_CondMod, [], _Mods2LOad) ->
+    ok;
+conditional_load(CondMod, [CondMod|_], Mods2Load) ->
+    on_load(Mods2Load);
+conditional_load(CondMod, [_|T], Mods2Load) ->
+    conditional_load(CondMod, T, Mods2Load).
+
+on_load([]) ->
+    ok;
+on_load([Mod|Mods]) ->
+    Mod:on_load(),
+    on_load(Mods).
+
+
+    
+
+