%%
%% %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.
