%%
%% %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:on_load(),
net:on_load(), % This needs to be loaded since it contains 'other' funcs...
%% 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(Mod) ->
conditional_load(Mod, erlang:loaded()).
conditional_load(_Mod, []) ->
ok;
conditional_load(Mod, [Mod|_]) ->
Mod:on_load();
conditional_load(Mod, [_|T]) ->
conditional_load(Mod, T).
