aboutsummaryrefslogblamecommitdiffstats
path: root/lib/test_server/src/test_server_node.erl
blob: 6358efa7647759dbd08e795f192e8937e3d4c5f0 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945

                   
  
                                                        
  




                                                                      
  



                                                                         
  


                          
              


                                                                   
                      

   



























































                                                                                
                                                             

































































































































































































































































































































                                                                                    
                                                                          











                                                                               
                                           


















































                                                                                 
                                                                          
                                        
                                                                         



















































































































































































































































































































































































































































































                                                                                     
















                                                              



























































                                                                      
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2002-2012. 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(test_server_node).
-compile(r12).

%%%
%%% The same compiled code for this module must be possible to load
%%% in R12B and later.
%%%

%% Test Controller interface
-export([is_release_available/1]).
-export([start_remote_main_target/1,stop/1]).
-export([start_tracer_node/2,trace_nodes/2,stop_tracer_node/1]).
-export([start_node/5, stop_node/2]).
-export([kill_nodes/1, nodedown/2]).
%% Internal export
-export([node_started/1,trc/1,handle_debug/4]).

-include("test_server_internal.hrl").
-record(slave_info, {name,socket,client}).
-define(VXWORKS_ACCEPT_TIMEOUT,?ACCEPT_TIMEOUT).

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%                                                                  %%%
%%% All code in this module executes on the test_server_ctrl process %%%
%%% except for node_started/1 and trc/1 which execute on a new node. %%%
%%%                                                                  %%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

is_release_available(Rel) when is_atom(Rel) ->
    is_release_available(atom_to_list(Rel));
is_release_available(Rel) ->
    case os:type() of
	{unix,_} ->
	    Erl = find_release(Rel),
	    case Erl of
		none -> false;
		_ -> filelib:is_regular(Erl)
	    end;
	_ ->
	    false
    end.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Start main target node on remote host
%%% The target node must not know the controller node via erlang distribution.
start_remote_main_target(Parameters) ->
    #par{type=TargetType,
	 target=TargetHost,
	 naming=Naming,
	 master=MasterNode,
	 cookie=MasterCookie,
	 slave_targets=SlaveTargets} = Parameters,

    lists:foreach(fun(T) -> maybe_reboot_target({TargetType,T}) end,
		  [list_to_atom(TargetHost)|SlaveTargets]),

    % Must give the targets a chance to reboot...
    case TargetType of
	vxworks ->
	    receive after 15000 -> ok end;
	_ ->
	    ok
    end,

    Cmd0 = get_main_target_start_command(TargetType,TargetHost,Naming,
					 MasterNode,MasterCookie),
    Cmd = 
	case os:getenv("TEST_SERVER_FRAMEWORK") of
	    FW when FW =:= false; FW =:= "undefined" -> Cmd0;
	    FW -> Cmd0 ++ " -env TEST_SERVER_FRAMEWORK " ++ FW
	end,
	
    {ok,LSock} = gen_tcp:listen(?MAIN_PORT,[binary,{reuseaddr,true},{packet,2}]),
    case start_target(TargetType,TargetHost,Cmd) of
	{ok,TargetClient,AcceptTimeout} ->
	    case gen_tcp:accept(LSock,AcceptTimeout) of
		{ok,Sock} -> 
		    gen_tcp:close(LSock),
		    receive 
			{tcp,Sock,Bin} when is_binary(Bin) ->
			    case unpack(Bin) of
				error ->
				    gen_tcp:close(Sock),
				    close_target_client(TargetClient),
				    {error,bad_message};
				{ok,{target_info,TI}} ->
				    put(test_server_free_targets,SlaveTargets),
				    {ok, TI#target_info{where=Sock,
							host=TargetHost,
							naming=Naming,
							master=MasterNode,
							target_client=TargetClient,
							slave_targets=SlaveTargets}}
			    end;
			{tcp_closed,Sock} ->
			    gen_tcp:close(Sock),
			    close_target_client(TargetClient),
			    {error,could_not_contact_target}
		    after AcceptTimeout ->
			    gen_tcp:close(Sock),
			    close_target_client(TargetClient),
			    {error,timeout}
		    end;
		Error -> 
		    %%! maybe something like kill_target(...)???
		    gen_tcp:close(LSock),
		    close_target_client(TargetClient),
		    {error,{could_not_contact_target,Error}}
	    end;
	Error ->
	    gen_tcp:close(LSock),
	    {error,{could_not_start_target,Error}}
    end.

stop(TI) ->
    kill_nodes(TI),
    case TI#target_info.where of
	local -> % there is no remote target to stop
	    ok;
	Sock ->  % stop remote target
	    gen_tcp:close(Sock),
	    close_target_client(TI#target_info.target_client)	    
    end.

nodedown(Sock, TI) ->
    Match = #slave_info{name='$1',socket=Sock,client='$2',_='_'},
    case ets:match(slave_tab,Match) of
	[[Node,Client]] -> % Slave node died
	    gen_tcp:close(Sock),
	    ets:delete(slave_tab,Node),
	    close_target_client(Client),
	    HostAtom = test_server_sup:hostatom(Node),
	    case lists:member(HostAtom,TI#target_info.slave_targets) of
		true -> 
		    put(test_server_free_targets,
			get(test_server_free_targets) ++ [HostAtom]);
		false -> ok
	    end,
	    slave_died;
	[] -> 
	    case TI#target_info.where of
		Sock ->
		    %% test_server_ctrl will do the cleanup
		    target_died;
		_ -> 
		    ignore
	    end
    end.





%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Start trace node
%%%
start_tracer_node(TraceFile,TI) ->
    Match = #slave_info{name='$1',_='_'},
    SlaveNodes = lists:map(fun([N]) -> [" ",N] end,
			   ets:match(slave_tab,Match)),
    TargetNode = case TI#target_info.where of
		     local -> node();
		     _ -> "test_server@" ++ TI#target_info.host
		 end,
    Cookie = TI#target_info.cookie,
    {ok,LSock} = gen_tcp:listen(0,[binary,{reuseaddr,true},{packet,2}]),
    {ok,TracePort} = inet:port(LSock),
    Prog = pick_erl_program(default),
    Cmd = lists:concat([Prog, " -sname tracer -hidden -setcookie ", Cookie, 
			" -s ", ?MODULE, " trc ", TraceFile, " ", 
			TracePort, " ", TI#target_info.os_family]),
    spawn(fun() -> print_data(open_port({spawn,Cmd},[stream])) end),
%!    open_port({spawn,Cmd},[stream]),
    case gen_tcp:accept(LSock,?ACCEPT_TIMEOUT) of
	{ok,Sock} -> 
	    gen_tcp:close(LSock),
	    receive 
		{tcp,Sock,Result} when is_binary(Result) ->
		    case unpack(Result) of
			error ->
			    gen_tcp:close(Sock),
			    {error,timeout};
			{ok,started} ->
			    trace_nodes(Sock,[TargetNode | SlaveNodes]),
			    {ok,Sock};
			{ok,Error} -> Error
		    end;
		{tcp_closed,Sock} ->
		    gen_tcp:close(Sock),
		    {error,could_not_start_tracernode}
	    after ?ACCEPT_TIMEOUT ->
		    gen_tcp:close(Sock),
		    {error,timeout}
	    end;
	Error -> 
	    gen_tcp:close(LSock),
	    {error,{could_not_start_tracernode,Error}}
    end.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Start a tracer on each of these nodes and set flags and patterns
%%%
trace_nodes(Sock,Nodes) ->
    Bin = term_to_binary({add_nodes,Nodes}),
    ok = gen_tcp:send(Sock, [1|Bin]),
    receive_ack(Sock).


receive_ack(Sock) ->
    receive
	{tcp,Sock,Bin} when is_binary(Bin) ->
	    case unpack(Bin) of
		error -> receive_ack(Sock);
		{ok,_} -> ok
	    end;
	_ ->
	    receive_ack(Sock)
    end.
    

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Stop trace node
%%%
stop_tracer_node(Sock) ->
    Bin = term_to_binary(id(stop)),
    ok = gen_tcp:send(Sock, [1|Bin]),
    receive {tcp_closed,Sock} -> gen_tcp:close(Sock) end,
    ok.
    



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% trc([TraceFile,Nodes]) -> ok
%%
%% Start tracing on the given nodes
%%
%% This function executes on the new node
%%
trc([TraceFile, PortAtom, Type]) ->
    {Result,Patterns} = 
	case file:consult(TraceFile) of
	    {ok,TI} ->
		Pat = parse_trace_info(lists:flatten(TI)),
		{started,Pat};
	    Error ->
		{Error,[]}
	end,
    Port = list_to_integer(atom_to_list(PortAtom)),
    case catch gen_tcp:connect("localhost", Port, [binary, 
						   {reuseaddr,true}, 
						   {packet,2}]) of
	{ok,Sock} -> 
	    BinResult = term_to_binary(Result),
	    ok = gen_tcp:send(Sock,[1|BinResult]),
	    trc_loop(Sock,Patterns,Type);
	_else ->
	    ok
    end,
    erlang:halt().
trc_loop(Sock,Patterns,Type) ->
    receive
	{tcp,Sock,Bin} ->
	    case unpack(Bin) of
		error ->
		    ttb:stop(),
		    gen_tcp:close(Sock);
		{ok,{add_nodes,Nodes}} -> 
		    add_nodes(Nodes,Patterns,Type),
		    Bin = term_to_binary(id(ok)),
		    ok = gen_tcp:send(Sock, [1|Bin]),
		    trc_loop(Sock,Patterns,Type);
		{ok,stop} -> 
		    ttb:stop(),
		    gen_tcp:close(Sock)
	    end;
	{tcp_closed,Sock} ->
	    ttb:stop(),
	    gen_tcp:close(Sock)
    end.
add_nodes(Nodes,Patterns,_Type) ->
    ttb:tracer(Nodes,[{file,{local, test_server}},
		      {handler, {{?MODULE,handle_debug},initial}}]),
    ttb:p(all,[call,timestamp]),
    lists:foreach(fun({TP,M,F,A,Pat}) -> ttb:TP(M,F,A,Pat);
		     ({CTP,M,F,A}) -> ttb:CTP(M,F,A) 
		  end,
		  Patterns).

parse_trace_info([{TP,M,Pat}|Pats]) when TP=:=tp; TP=:=tpl ->
    [{TP,M,'_','_',Pat}|parse_trace_info(Pats)];
parse_trace_info([{TP,M,F,Pat}|Pats]) when TP=:=tp; TP=:=tpl ->
    [{TP,M,F,'_',Pat}|parse_trace_info(Pats)];
parse_trace_info([{TP,M,F,A,Pat}|Pats]) when TP=:=tp; TP=:=tpl ->
    [{TP,M,F,A,Pat}|parse_trace_info(Pats)];
parse_trace_info([CTP|Pats]) when CTP=:=ctp; CTP=:=ctpl; CTP=:=ctpg ->
    [{CTP,'_','_','_'}|parse_trace_info(Pats)];
parse_trace_info([{CTP,M}|Pats]) when CTP=:=ctp; CTP=:=ctpl; CTP=:=ctpg ->
    [{CTP,M,'_','_'}|parse_trace_info(Pats)];
parse_trace_info([{CTP,M,F}|Pats]) when CTP=:=ctp; CTP=:=ctpl; CTP=:=ctpg ->
    [{CTP,M,F,'_'}|parse_trace_info(Pats)];
parse_trace_info([{CTP,M,F,A}|Pats]) when CTP=:=ctp; CTP=:=ctpl; CTP=:=ctpg ->
    [{CTP,M,F,A}|parse_trace_info(Pats)];
parse_trace_info([]) ->
    [];
parse_trace_info([_other|Pats]) -> % ignore
    parse_trace_info(Pats).

handle_debug(Out,Trace,TI,initial) ->
    handle_debug(Out,Trace,TI,0);
handle_debug(_Out,end_of_trace,_TI,N) ->
    N;
handle_debug(Out,Trace,_TI,N) ->
    print_trc(Out,Trace,N),
    N+1.

print_trc(Out,{trace_ts,P,call,{M,F,A},C,Ts},N) ->
    io:format(Out,
	      "~w: ~s~n"
	      "Process   : ~w~n"
	      "Call      : ~w:~w/~w~n"
	      "Arguments : ~p~n"
	      "Caller    : ~w~n~n",
	      [N,ts(Ts),P,M,F,length(A),A,C]);
print_trc(Out,{trace_ts,P,call,{M,F,A},Ts},N) ->
    io:format(Out,
	      "~w: ~s~n"
	      "Process   : ~w~n"
	      "Call      : ~w:~w/~w~n"
	      "Arguments : ~p~n~n",
	      [N,ts(Ts),P,M,F,length(A),A]);
print_trc(Out,{trace_ts,P,return_from,{M,F,A},R,Ts},N) ->
    io:format(Out,
	      "~w: ~s~n"
	      "Process      : ~w~n"
	      "Return from  : ~w:~w/~w~n"
	      "Return value : ~p~n~n",
	      [N,ts(Ts),P,M,F,A,R]);
print_trc(Out,{drop,X},N) ->
    io:format(Out,
	      "~w: Tracer dropped ~w messages - too busy~n~n",
	      [N,X]);
print_trc(Out,Trace,N) ->
    Ts = element(size(Trace),Trace),
    io:format(Out,
	      "~w: ~s~n"
	      "Trace        : ~p~n~n",
	      [N,ts(Ts),Trace]).
ts({_, _, Micro} = Now) ->
    {{Y,M,D},{H,Min,S}} = calendar:now_to_local_time(Now),
    io_lib:format("~4.4.0w-~2.2.0w-~2.2.0w ~2.2.0w:~2.2.0w:~2.2.0w,~6.6.0w",
		  [Y,M,D,H,Min,S,Micro]).




%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Start slave/peer nodes (initiated by test_server:start_node/5)
%%%
start_node(SlaveName, slave, Options, From, TI) when is_list(SlaveName) ->
    start_node_slave(list_to_atom(SlaveName), Options, From, TI);
start_node(SlaveName, slave, Options, From, TI) ->
    start_node_slave(SlaveName, Options, From, TI);
start_node(SlaveName, peer, Options, From, TI) when is_atom(SlaveName) ->
    start_node_peer(atom_to_list(SlaveName), Options, From, TI);
start_node(SlaveName, peer, Options, From, TI) ->
    start_node_peer(SlaveName, Options, From, TI);
start_node(_SlaveName, _Type, _Options, _From, _TI) ->
    not_implemented_yet.

%%
%% Peer nodes are always started on the same host as test_server_ctrl
%% Socket communication is used in case target and controller is
%% not the same node (target must not know the controller node
%% via erlang distribution)
%%
start_node_peer(SlaveName, OptList, From, TI) ->
    SuppliedArgs = start_node_get_option_value(args, OptList, []),
    Cleanup = start_node_get_option_value(cleanup, OptList, true),
    HostStr = test_server_sup:hoststr(),
    {ok,LSock} = gen_tcp:listen(0,[binary,
				   {reuseaddr,true},
				   {packet,2}]),
    {ok,WaitPort} = inet:port(LSock),
    NodeStarted = lists:concat([" -s ", ?MODULE, " node_started ",
				      HostStr, " ", WaitPort]),

    % Support for erl_crash_dump files..
    CrashFile = filename:join([TI#target_info.test_server_dir,
			       "erl_crash_dump."++cast_to_list(SlaveName)]),
    CrashArgs = lists:concat([" -env ERL_CRASH_DUMP \"",CrashFile,"\" "]),
    FailOnError = start_node_get_option_value(fail_on_error, OptList, true),
    Pa = TI#target_info.test_server_dir,
    Prog0 = start_node_get_option_value(erl, OptList, default),
    Prog = pick_erl_program(Prog0),
    Args = 
	case string:str(SuppliedArgs,"-setcookie") of
	    0 -> "-setcookie " ++ TI#target_info.cookie ++ " " ++ SuppliedArgs;
	    _ -> SuppliedArgs
	end,
    Cmd = lists:concat([Prog,
			" -detached ",
			TI#target_info.naming, " ", SlaveName,
			" -pa \"", Pa,"\"",
			NodeStarted,
			CrashArgs,
			" ", Args]),
    Opts = case start_node_get_option_value(env, OptList, []) of
	       [] -> [];
	       Env -> [{env, Env}]
	   end,
    %% peer is always started on localhost
    %%
    %% Bad environment can cause open port to fail. If this happens,
    %% we ignore it and let the testcase handle the situation...
    catch open_port({spawn, Cmd}, [stream|Opts]),
    
    case start_node_get_option_value(wait, OptList, true) of
	true ->
	    Ret = wait_for_node_started(LSock,60000,undefined,Cleanup,TI,self()),
	    case {Ret,FailOnError} of
		{{{ok, Node}, Warning},_} ->
		    gen_server:reply(From,{{ok,Node},HostStr,Cmd,[],Warning});
		{_,false} ->
		    gen_server:reply(From,{Ret, HostStr, Cmd});
		{_,true} ->
		    gen_server:reply(From,{fail,{Ret, HostStr, Cmd}})
	    end;
	false ->
	    Nodename = list_to_atom(SlaveName ++ "@" ++ HostStr),
	    I = "=== Not waiting for node",
	    gen_server:reply(From,{{ok, Nodename}, HostStr, Cmd, I, []}),
	    Self = self(),
	    spawn_link(
	      fun() -> 
		      wait_for_node_started(LSock,60000,undefined,
					    Cleanup,TI,Self),
		      receive after infinity -> ok end
	      end),
	    ok
    end.

%%
%% Slave nodes are started on a remote host if
%% - the option remote is given when calling test_server:start_node/3
%% or
%% - the target type is vxworks, since only one erlang node
%%   can be started on each vxworks host.
%%
start_node_slave(SlaveName, OptList, From, TI) ->
    SuppliedArgs = start_node_get_option_value(args, OptList, []),
    Cleanup = start_node_get_option_value(cleanup, OptList, true),

    CrashFile = filename:join([TI#target_info.test_server_dir,
			       "erl_crash_dump."++cast_to_list(SlaveName)]),
    CrashArgs = lists:concat([" -env ERL_CRASH_DUMP \"",CrashFile,"\" "]),
    Pa = TI#target_info.test_server_dir,
    Args = lists:concat([" -pa \"", Pa, "\" ", SuppliedArgs, CrashArgs]),

    Prog0 = start_node_get_option_value(erl, OptList, default),
    Prog = pick_erl_program(Prog0),
    Ret = 
	case start_which_node(OptList) of
	    {error,Reason} -> {{error,Reason},undefined,undefined};
	    Host0 -> do_start_node_slave(Host0,SlaveName,Args,Prog,Cleanup,TI)
	end,
    gen_server:reply(From,Ret).


do_start_node_slave(Host0, SlaveName, Args, Prog, Cleanup, TI) ->
    case TI#target_info.where of
	local ->
	    Host = 
		case Host0 of
		    local -> test_server_sup:hoststr();
		    _ -> cast_to_list(Host0)
		end,
	    Cmd = Prog ++ " " ++ Args,
	    %% Can use slave.erl here because I'm both controller and target
	    %% so I will ping the new node anyway
	    case slave:start(Host, SlaveName, Args, no_link, Prog) of
		{ok,Nodename} -> 
		    case Cleanup of
			true -> ets:insert(slave_tab,#slave_info{name=Nodename});
			false -> ok
		    end,
		    {{ok,Nodename}, Host, Cmd, [], []};
		Ret -> 
		    {Ret, Host, Cmd}
	    end;
    
	_Sock ->
	    %% Cannot use slave.erl here because I'm only controller, and will
	    %% not ping the new node. Only target shall contact the new node!!
	    no_contact_start_slave(Host0,SlaveName,Args,Prog,Cleanup,TI)
    end.



no_contact_start_slave(Host, Name, Args0, Prog, Cleanup,TI) ->
    Args1 = case string:str(Args0,"-setcookie") of
		0 -> "-setcookie " ++ TI#target_info.cookie ++ " " ++ Args0;
		_ -> Args0
	    end,
    Args = TI#target_info.naming ++ " " ++ cast_to_list(Name) ++ " " ++ Args1,
    case Host of
	local ->
	    case get(test_server_free_targets) of
		[] ->
		    io:format("Starting slave ~p on HOST~n", [Name]),
		    TargetType = test_server_sup:get_os_family(),
		    Cmd0 = get_slave_node_start_command(TargetType,
							Prog,
							TI#target_info.master),
		    Cmd = Cmd0 ++ " " ++ Args,
		    do_no_contact_start_slave(TargetType,
					      test_server_sup:hoststr(),
					      Cmd, Cleanup,TI, false);
		[H|T] ->
		    TargetType = TI#target_info.os_family,
		    Cmd0 = get_slave_node_start_command(TargetType,
							Prog,
							TI#target_info.master),
		    Cmd = Cmd0 ++ " " ++ Args,
		    case do_no_contact_start_slave(TargetType,H,Cmd,Cleanup,
						   TI,true) of
			{error,remove} ->
			    io:format("Cannot start node on ~p, "
				      "removing from slave "
				      "target list.", [H]),
			    put(test_server_free_targets,T),
			    no_contact_start_slave(Host,Name,Args,Prog,
						   Cleanup,TI);
			{error,keep} ->
			    %% H is added to the END OF THE LIST 
			    %% in order to avoid the same target to
			    %% be selected each time
			    put(test_server_free_targets,T++[H]),
			    no_contact_start_slave(Host,Name,Args,Prog,
						   Cleanup,TI);
			R ->
			    put(test_server_free_targets,T),
			    R
		    end
	    end;
	_ -> 
	    TargetType = TI#target_info.os_family,
	    Cmd0 = get_slave_node_start_command(TargetType,
						Prog,
						TI#target_info.master),
	    Cmd = Cmd0 ++ " " ++ Args,
	    do_no_contact_start_slave(TargetType, Host, Cmd, Cleanup, TI, false)
    end.

do_no_contact_start_slave(TargetType,Host0,Cmd0,Cleanup,TI,Retry) ->
    %% Must use TargetType instead of TI#target_info.os_familiy here 
    %% because if there were no free_targets we will be starting the 
    %% slave node on host which might have a different os_familiy
    Host = cast_to_list(Host0),
    {ok,LSock} = gen_tcp:listen(0,[binary,
				    {reuseaddr,true},
				    {packet,2}]),
    {ok,WaitPort} = inet:port(LSock),
    Cmd = lists:concat([Cmd0, " -s ", ?MODULE, " node_started ", 
			test_server_sup:hoststr(), " ", WaitPort]),

    case start_target(TargetType,Host,Cmd) of
	{ok,Client,AcceptTimeout} ->
	    case wait_for_node_started(LSock,AcceptTimeout,
				       Client,Cleanup,TI,self()) of
		{error,_}=WaitError -> 
		    if Retry ->
			    case maybe_reboot_target(Client) of
				{error,_} -> {error,remove};
				ok -> {error,keep}
			    end;
		       true ->
			    {WaitError,Host,Cmd}
		    end;
		{Ok,Warning} -> 
		    {Ok,Host,Cmd,[],Warning}
	    end;
	StartError ->
	    gen_tcp:close(LSock),
	    if Retry -> {error,remove};
	       true -> {{error,{could_not_start_target,StartError}},Host,Cmd}
	    end
    end.


wait_for_node_started(LSock,Timeout,Client,Cleanup,TI,CtrlPid) ->
    case gen_tcp:accept(LSock,Timeout) of
	{ok,Sock} -> 
	    gen_tcp:close(LSock),
	    receive 
		{tcp,Sock,Started0} when is_binary(Started0) ->
		    case unpack(Started0) of
			error ->
			    gen_tcp:close(Sock),
			    {error, connection_closed};
			{ok,Started} ->
			    Version = TI#target_info.otp_release,
			    VsnStr = TI#target_info.system_version,
			    {ok,Nodename, W} = 
				handle_start_node_return(Version,
							 VsnStr,
							 Started),
			    case Cleanup of
				true ->
				    ets:insert(slave_tab,#slave_info{name=Nodename,
								     socket=Sock,
								     client=Client});
				false -> ok
			    end,
			    gen_tcp:controlling_process(Sock,CtrlPid),
			    test_server_ctrl:node_started(Nodename),
			    {{ok,Nodename},W}
		    end;
		{tcp_closed,Sock} ->
		    gen_tcp:close(Sock),
		    {error, connection_closed}
	    after Timeout ->
		    gen_tcp:close(Sock),
		    {error, timeout}
	    end;
	{error,Reason} -> 
	    gen_tcp:close(LSock),
	    {error, {no_connection,Reason}}
    end.



handle_start_node_return(Version,VsnStr,{started, Node, Version, VsnStr}) ->
    {ok, Node, []};
handle_start_node_return(Version,VsnStr,{started, Node, OVersion, OVsnStr}) ->
    Str = io_lib:format("WARNING: Started node "
			"reports different system "
			"version than current node! "
			"Current node version: ~p, ~p "
			"Started node version: ~p, ~p",
			[Version, VsnStr, 
			 OVersion, OVsnStr]),
    Str1 = lists:flatten(Str),
    {ok, Node, Str1}.


%%
%% This function executes on the new node
%%
node_started([Host,PortAtom]) ->
    %% Must spawn a new process because the boot process should not 
    %% hang forever!!
    spawn(fun() -> node_started(Host,PortAtom) end).

%% This process hangs forever, just waiting for the socket to be
%% closed and terminating the node
node_started(Host,PortAtom) ->
    {_, Version} = init:script_id(),
    VsnStr = erlang:system_info(system_version),
    Port = list_to_integer(atom_to_list(PortAtom)),
    case catch gen_tcp:connect(Host,Port, [binary, 
				     {reuseaddr,true}, 
				     {packet,2}]) of
	
	{ok,Sock} -> 
	    Started = term_to_binary({started, node(), Version, VsnStr}),
	    ok = gen_tcp:send(Sock, [1|Started]),
	    receive _Anyting ->
		    gen_tcp:close(Sock),
		    erlang:halt()
	    end;
	_else ->
	    erlang:halt()
    end.





% start_which_node(Optlist) -> hostname
start_which_node(Optlist) ->
    case start_node_get_option_value(remote, Optlist) of
	undefined ->
	    local;
	true ->
	    case find_remote_host() of
		{error, Other} ->
		    {error, Other};
		RHost ->
		    RHost
	    end
    end.
 
find_remote_host() ->
    HostList=test_server_ctrl:get_hosts(),
    case lists:delete(test_server_sup:hoststr(), HostList) of
	[] ->
	    {error, no_remote_hosts};
	[RHost|_Rest] ->
	    RHost
    end.

start_node_get_option_value(Key, List) ->
    start_node_get_option_value(Key, List, undefined).

start_node_get_option_value(Key, List, Default) ->
    case lists:keysearch(Key, 1, List) of
	{value, {Key, Value}} ->
	    Value;
	false ->
	    Default
    end.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% stop_node(Name) -> ok | {error,Reason}
%%
%% Clean up - test_server will stop this node
stop_node(Name, TI) ->
    case ets:lookup(slave_tab,Name) of
	[#slave_info{client=Client}] -> 
	    ets:delete(slave_tab,Name),
	    HostAtom = test_server_sup:hostatom(Name),
	    case lists:member(HostAtom,TI#target_info.slave_targets) of
		true -> 
		    put(test_server_free_targets,
			get(test_server_free_targets) ++ [HostAtom]);
		false -> ok
	    end,
	    close_target_client(Client),
	    ok;
	[] -> 
	    {error, not_a_slavenode}
    end.
	    
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% kill_nodes(TI) -> ok
%%
%% Brutally kill all slavenodes that were not stopped by test_server
kill_nodes(TI) ->
    case ets:match_object(slave_tab,'_') of
	[] -> [];
	List ->
	    lists:map(fun(SI) -> kill_node(SI,TI) end, List)
    end.

kill_node(SI,TI) ->
    Name = SI#slave_info.name,
    ets:delete(slave_tab,Name),
    HostAtom = test_server_sup:hostatom(Name),
    case lists:member(HostAtom,TI#target_info.slave_targets) of
	true ->
	    put(test_server_free_targets,
		get(test_server_free_targets) ++ [HostAtom]);
	false -> ok
    end,
    case SI#slave_info.socket of
	undefined ->
	    catch rpc:call(Name,erlang,halt,[]);
	Sock ->
	    gen_tcp:close(Sock)
    end,
    close_target_client(SI#slave_info.client),
    Name.



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Platform specific code

start_target(vxworks,TargetHost,Cmd) ->
    case vxworks_client:open(TargetHost) of
	{ok,P} ->
	    case vxworks_client:send_data(P,Cmd,"start_erl called") of
		{ok,_} -> 
		    {ok,{vxworks,P},?VXWORKS_ACCEPT_TIMEOUT};
		Error -> 
		    Error
	    end;
	Error ->
	    Error
    end;

start_target(unix,TargetHost,Cmd0) ->
    Cmd = 
	case test_server_sup:hoststr() of
	    TargetHost -> Cmd0;
	    _ -> lists:concat(["rsh ",TargetHost, " ", Cmd0])
	end,
    open_port({spawn, Cmd}, [stream]),
    {ok,undefined,?ACCEPT_TIMEOUT}.

maybe_reboot_target({vxworks,P}) when is_pid(P) ->
    %% Reboot the vxworks card.
    %% Client is also closed after this, even if reboot fails
    vxworks_client:send_data_wait_for_close(P,"q");
maybe_reboot_target({vxworks,T}) when is_atom(T) ->
    %% Reboot the vxworks card.
    %% Client is also closed after this, even if reboot fails
    vxworks_client:reboot(T);
maybe_reboot_target(_) ->
    {error, cannot_reboot_target}.

close_target_client({vxworks,P}) ->
    vxworks_client:close(P);
close_target_client(undefined) ->
    ok.



%%
%% Command for starting main target
%% 
get_main_target_start_command(vxworks,_TargetHost,Naming,
			      _MasterNode,_MasterCookie) ->
    "e" ++ Naming ++ " test_server -boot start_sasl"
	" -sasl errlog_type error"
	" -s test_server start " ++ test_server_sup:hoststr();
get_main_target_start_command(unix,_TargetHost,Naming,
			      _MasterNode,_MasterCookie) ->
    Prog = pick_erl_program(default),
    Prog ++ " " ++  Naming ++ " test_server" ++
	" -boot start_sasl -sasl errlog_type error"
	" -s test_server start " ++ test_server_sup:hoststr().

%% 
%% Command for starting slave nodes
%% 
get_slave_node_start_command(vxworks, _Prog, _MasterNode) ->
    "e";
    %"e-noinput -master " ++ MasterNode;
get_slave_node_start_command(unix, Prog, MasterNode) ->
    cast_to_list(Prog) ++ " -detached -master " ++ MasterNode.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% cast_to_list(X) -> string()
%%% X = list() | atom() | void()
%%% Returns a string representation of whatever was input

cast_to_list(X) when is_list(X) -> X;
cast_to_list(X) when is_atom(X) -> atom_to_list(X);
cast_to_list(X) -> lists:flatten(io_lib:format("~w", [X])).


%%% L contains elements of the forms
%%%  {prog, String}
%%%  {release, Rel} where Rel = String | latest | previous
%%%  this
%%%
pick_erl_program(default) ->
    cast_to_list(lib:progname());
pick_erl_program(L) ->
    P = random_element(L),
    case P of
	{prog, S} ->
	    S;
	{release, S} ->
	    find_release(S);
	this ->
	    lib:progname()
    end.

random_element(L) ->
    {A,B,C} = now(),
    E = lists:sum([A,B,C]) rem length(L),
    lists:nth(E+1, L).

find_release(latest) ->
    "/usr/local/otp/releases/latest/bin/erl";
find_release(previous) ->
    "kaka";
find_release(Rel) ->
    find_release(os:type(), Rel).

find_release({unix,sunos}, Rel) ->
    case os:cmd("uname -p") of
	"sparc" ++ _ ->
	    "/usr/local/otp/releases/otp_beam_solaris8_" ++ Rel ++ "/bin/erl";
	_ ->
	    none
    end;
find_release({unix,linux}, Rel) ->
    Candidates = find_rel_linux(Rel),
    case lists:dropwhile(fun(N) ->
				 not filelib:is_regular(N)
			 end, Candidates) of
	[] -> none;
	[Erl|_] -> Erl
    end;
find_release(_, _) -> none.

find_rel_linux(Rel) ->
    case suse_release() of
	none -> [];
	SuseRel -> find_rel_suse(Rel, SuseRel)
    end.

find_rel_suse(Rel, SuseRel) ->
    Root = "/usr/local/otp/releases/otp_beam_linux_sles",
    case SuseRel of
	"11" ->
	    %% Try both SuSE 11, SuSE 10 and SuSe 9 in that order.
	    find_rel_suse_1(Rel, Root++"11") ++
		find_rel_suse_1(Rel, Root++"10") ++
		find_rel_suse_1(Rel, Root++"9");
	"10" ->
	    %% Try both SuSE 10 and SuSe 9 in that order.
	    find_rel_suse_1(Rel, Root++"10") ++
		find_rel_suse_1(Rel, Root++"9");
	"9" ->
	    find_rel_suse_1(Rel, Root++"9");
	_ ->
	    []
    end.

find_rel_suse_1(Rel, RootWc) ->
    case erlang:system_info(wordsize) of
	4 ->
	    find_rel_suse_2(Rel, RootWc++"_i386");
	8 ->
	    find_rel_suse_2(Rel, RootWc++"_x64") ++
		find_rel_suse_2(Rel, RootWc++"_i386")
    end.

find_rel_suse_2(Rel, RootWc) ->
    RelDir = filename:dirname(RootWc),
    Pat = filename:basename(RootWc ++ "_" ++ Rel) ++ ".*",
    case file:list_dir(RelDir) of
	{ok,Dirs} ->
	    case lists:filter(fun(Dir) ->
				      case re:run(Dir, Pat) of
					  nomatch -> false;
					  _       -> true
				      end
			      end, Dirs) of
		[] ->
		    [];
		[R|_] ->
		    [filename:join([RelDir,R,"bin","erl"])]
	    end;
	_ ->
	    []
    end.

%% suse_release() -> VersionString | none.
%%  Return the major SuSE version number for this platform or
%%  'none' if this is not a SuSE platform.
suse_release() ->
    case file:open("/etc/SuSE-release", [read]) of
	{ok,Fd} ->
	    try
		suse_release(Fd)
	    after
		file:close(Fd)
	    end;
	{error,_} -> none
    end.

suse_release(Fd) ->
    case io:get_line(Fd, '') of
	eof -> none;
	Line when is_list(Line) ->
	    case re:run(Line, "^VERSION\\s*=\\s*(\\d+)\s*",
			[{capture,all_but_first,list}]) of
		nomatch ->
		    suse_release(Fd);
		{match,[Version]} ->
		    Version
	    end
    end.

unpack(Bin) ->
    {One,Term} = split_binary(Bin, 1),
    case binary_to_list(One) of
	[1] ->
	    case catch {ok,binary_to_term(Term)} of
		{'EXIT',_} -> error;
		{ok,_}=Res -> Res
	    end;
	_ -> error
    end.

id(I) -> I.
   
print_data(Port) ->
    receive
	{Port, {data, Bytes}} ->
	    io:put_chars(Bytes),
	    print_data(Port);
	{Port, eof} ->
	    Port ! {self(), close}, 
	    receive
		{Port, closed} ->
		    true
	    end, 
	    receive
		{'EXIT',  Port,  _} -> 
		    ok
	    after 1 ->				% force context switch
		    ok
	    end
    end.