%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1997-2016. 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(os_mon_sysinfo).
-behaviour(gen_server).
%% API
-export([start_link/0]).
-export([get_disk_info/0, get_disk_info/1, get_mem_info/0]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-define(DISK_INFO, $d).
-define(MEM_INFO, $m).
-define(OK, $o).
-record(state, {port}).
%%----------------------------------------------------------------------
%% API
%%----------------------------------------------------------------------
start_link() ->
gen_server:start_link({local,os_mon_sysinfo}, os_mon_sysinfo, [],[]).
get_disk_info() ->
gen_server:call(os_mon_sysinfo, get_disk_info).
get_disk_info(DriveRoot) ->
gen_server:call(os_mon_sysinfo, {get_disk_info,DriveRoot}).
get_mem_info() ->
gen_server:call(os_mon_sysinfo, get_mem_info).
%%----------------------------------------------------------------------
%% gen_server callbacks
%%----------------------------------------------------------------------
init([]) ->
process_flag(trap_exit, true),
process_flag(priority, low),
Port = case os:type() of
{win32, _OSname} -> start_portprogram();
OS -> exit({unsupported_os, OS})
end,
{ok, #state{port=Port}}.
handle_call(get_disk_info, _From, State) ->
{reply, get_disk_info1(State#state.port), State};
handle_call({get_disk_info,RootList}, _From, State) ->
{reply, get_disk_info1(State#state.port,RootList), State};
handle_call(get_mem_info, _From, State) ->
{reply, get_mem_info1(State#state.port), State}.
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info({'EXIT', _Port, Reason}, State) ->
{stop, {port_died, Reason}, State#state{port=not_used}};
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, State) ->
case State#state.port of
not_used ->
ok;
Port ->
port_close(Port)
end,
ok.
%% os_mon-2.0
%% For live downgrade to/upgrade from os_mon-1.8[.1]
code_change(Vsn, PrevState, "1.8") ->
case Vsn of
%% Downgrade from this version
{down, _Vsn} ->
process_flag(trap_exit, false);
%% Upgrade to this version
_Vsn ->
process_flag(trap_exit, true)
end,
{ok, PrevState};
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%----------------------------------------------------------------------
%% Internal functions
%%----------------------------------------------------------------------
start_portprogram() ->
Port = os_mon:open_port("win32sysinfo.exe", [{packet,1}]),
receive
{Port, {data, [?OK]}} ->
Port;
{Port, {data, Data}} ->
exit({port_error, Data});
{'EXIT', Port, Reason} ->
exit({port_died, Reason})
after 5000 ->
exit({port_error, timeout})
end.
get_disk_info1(Port) ->
Port ! {self(),{command,[?DISK_INFO]}},
get_data(Port,[]).
get_disk_info1(Port,PathList) ->
Port ! {self(),{command,[?DISK_INFO|[P++[0]||P <- PathList]]}},
get_data(Port,[]).
get_mem_info1(Port) ->
Port ! {self(),{command,[?MEM_INFO]}},
get_data(Port,[]).
get_data(Port, Sofar) ->
receive
{Port, {data, [?OK]}} ->
lists:reverse(Sofar);
{Port, {data, Bytes}} ->
get_data(Port, [Bytes|Sofar]);
{'EXIT', Port, Reason} ->
exit({port_died, Reason})
after 5000 ->
lists:reverse(Sofar)
end.
