%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2002-2011. 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%
%%
%%
-module(asn1rt_driver_handler).
-include("asn1_records.hrl").
-export([load_driver/0,unload_driver/0,client_port/0]).
%% Internal exports
-export([init/2]).
%% Macros
-define(port_names,
{ asn1_drv01, asn1_drv02, asn1_drv03, asn1_drv04,
asn1_drv05, asn1_drv06, asn1_drv07, asn1_drv08,
asn1_drv09, asn1_drv10, asn1_drv11, asn1_drv12,
asn1_drv13, asn1_drv14, asn1_drv15, asn1_drv16 }).
%%% --------------------------------------------------------
%%% Interface Functions.
%%% --------------------------------------------------------
load_driver() ->
load_driver(noreason).
load_driver(Reason) ->
Ref = make_ref(),
case whereis(asn1_driver_owner) of % to prevent unnecessary spawn
Pid when is_pid(Pid) ->
asn1_driver_owner ! {self(),Ref,are_you_ready},
receive
{Ref,driver_ready} ->
ok
after 10000 ->
{error,{timeout,waiting_for_drivers}}
end;
_ ->
{_,Mref} = spawn_monitor(asn1rt_driver_handler, init, [self(),Ref]),
receive
{'DOWN', Mref, _, _, NewReason} ->
case NewReason of
Reason -> {error,Reason};
_ -> load_driver(NewReason)
end;
{Ref,driver_ready} ->
erlang:demonitor(Mref),
ok;
{Ref,Error = {error,_Reason}} ->
erlang:demonitor(Mref),
Error
after 10000 -> %% 10 seconds
{error,{timeout,waiting_for_drivers}}
end
end.
init(FromPid,FromRef) ->
case catch register(asn1_driver_owner,self()) of
true -> true;
_Other -> exit(normal)
end,
Dir = filename:join([code:priv_dir(asn1),"lib"]),
case catch erl_ddll:load_driver(Dir,asn1_erl_drv) of
ok ->
Result = open_named_ports(),
catch (FromPid ! {FromRef,Result}),
loop(Result);
{error,Err} -> % if erl_ddll:load_driver fails
ForErr = erl_ddll:format_error(Err),
OSDir = filename:join(Dir,erlang:system_info(system_architecture)),
case catch erl_ddll:load_driver(OSDir,asn1_erl_drv) of
ok ->
Result = open_named_ports(),
catch (FromPid ! {FromRef,Result}),
loop(Result);
{error,Err2} ->
% catch (FromPid ! {FromRef,Error})
ForErr2 = erl_ddll:format_error(Err2),
catch (FromPid ! {FromRef,{error,{{Dir,ForErr},{OSDir,ForErr2}}}})
end
end.
open_named_ports() ->
open_named_ports(size(?port_names)).
open_named_ports(0) ->
driver_ready;
open_named_ports(N) ->
case catch open_port({spawn,"asn1_erl_drv"},[]) of
{'EXIT',Reason} ->
{error,{port_error,Reason}};
Port ->
register(element(N,?port_names),Port),
open_named_ports(N-1)
end.
loop(Result) ->
receive
{_FromPid,_FromRef,unload} ->
close_ports(size(?port_names)),
erl_ddll:unload_driver(asn1_erl_drv),
ok;
{FromPid,FromRef,are_you_ready} ->
catch (FromPid ! {FromRef,driver_ready}),
loop(Result);
_ ->
loop(Result)
end.
unload_driver() ->
case whereis(asn1_driver_owner) of
Pid when is_pid(Pid) ->
Pid ! {self(),make_ref(),unload},
ok;
_ ->
ok
end.
close_ports(0) ->
ok;
close_ports(N) ->
element(N,?port_names) ! {self(), close}, %% almost same as port_close(Name)
close_ports(N-1).
client_port() ->
element(erlang:system_info(scheduler_id) rem size(?port_names) + 1,
?port_names).
