Erlang Special Process Template

special_process.erl

-module(special_process).

-export([start_link/0,
         init/1,
         loop/1,
         system_continue/3,
         system_terminate/4,
         system_code_change/4]).

%% Remember to use fully qualified function calls, where you want code loading to happen.

start_link() -> proc_lib:start_link(?MODULE , init, [self()]).

init(Parent) ->
    register(?MODULE, self()),
    proc_lib:init_ack({ok, self()}),
    loop(state).

loop(state) ->
    receive
        {'EXIT', Parent, Reason} ->
            exit(Reason);
        {system, From, Request} ->
            sys:handle_system_msg(Request, From, Parent, ?MODULE, [], {state}).
    end.

system_continue(_Parent, _Debug, {state}) -> loop(state).

system_terminate(Reason, _Parent, _Debug, _State) -> exit(Reason).

system_code_change(State, _Module, _OldVsn, _Extra) -> {ok, State}.