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+%%
+%% %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(),
+ conditional_load(socket, [socket, net]), % socket:on_load(), net:on_load(),
+ %% 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) ->
+ conditional_load(CondMod, erlang: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).
+
+
+
+
+