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path: root/lib/inets/src/tftp/tftp_sup.erl
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%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 2005-2015. All Rights Reserved.
%% 
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%% 
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% 
%% %CopyrightEnd%
%%
%%
%%----------------------------------------------------------------------
%% Purpose: The top supervisor for tftp hangs under inets_sup.
%%----------------------------------------------------------------------

-module(tftp_sup).

-behaviour(supervisor).

%% API
-export([start_link/1,
	 start_child/1,
	 stop_child/1,
	 which_children/0]).

%% Supervisor callback
-export([init/1]).

%%%=========================================================================
%%%  API
%%%=========================================================================

start_link(TftpServices) ->
    supervisor:start_link({local, ?MODULE}, ?MODULE, [TftpServices]).

start_child(Options) ->
    KillAfter = default_kill_after(),
    ChildSpec = worker_spec(KillAfter, Options),
    supervisor:start_child(?MODULE, ChildSpec).

stop_child(Pid) when is_pid(Pid) ->
    Children = supervisor:which_children(?MODULE),
    case [Id || {Id, P, _Type, _Modules} <- Children, P =:= Pid] of
	[] ->
	    {error, not_found};
	[Id] ->
	    case supervisor:terminate_child(?MODULE, Id) of
		ok ->
		    supervisor:delete_child(?MODULE, Id);
		{error, not_found} ->
		    supervisor:delete_child(?MODULE, Id);
		{error, Reason} ->
		    {error, Reason}
	    end
    end.

which_children() ->
    Children = supervisor:which_children(?MODULE),
    [{tftpd, Pid} || {_Id, Pid, _Type, _Modules} <- Children, Pid =/= undefined].
    
%%%=========================================================================
%%%  Supervisor callback
%%%=========================================================================

init([Services]) when is_list(Services) ->
    RestartStrategy = one_for_one,
    MaxR = 10,
    MaxT = 3600,
    KillAfter = default_kill_after(),
    Children = [worker_spec(KillAfter, Options) || {tftpd, Options} <- Services],
    {ok, {{RestartStrategy, MaxR, MaxT}, Children}}.

%%%=========================================================================
%%%  Internal functions
%%%=========================================================================

worker_spec(KillAfter, Options) ->
    Modules = [proc_lib, tftp, tftp_engine],
    KA = supervisor_timeout(KillAfter),
    Name = unique_name(Options),
    {Name, {tftp, start, [Options]}, permanent, KA, worker, Modules}.

unique_name(Options) ->
    case lists:keysearch(port, 1, Options) of
	{value, {_, Port}} when is_integer(Port), Port > 0 -> 
	    {tftpd, Port};
	_ ->
	    {tftpd, unique_integer()}
    end.

unique_integer() ->
    %% Adapt to OTP 18 erlang time API and be back-compatible
    try
	erlang:unique_integer([positive])
    catch
	error:undef ->
	    {MS, S, US} = erlang:now(),
	    (MS*1000000+S)*1000000+US
    end.

default_kill_after() ->
    timer:seconds(3).

%% supervisor_spec(Name) ->
%%     {Name, {Name, start, []}, permanent, infinity, supervisor,
%%      [Name, supervisor]}.
    
-ifdef(debug_shutdown).
supervisor_timeout(_KillAfter) -> timer:hours(24).
-else.
supervisor_timeout(KillAfter) -> KillAfter.
-endif.