aboutsummaryrefslogtreecommitdiffstats
path: root/lib/runtime_tools/test/dbg_SUITE.erl
blob: 04430263b4dd45cced6acf12459bbca2aa3f58c1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
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
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2010-2016. 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(dbg_SUITE).

%% Test functions
-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, 
	 init_per_group/2,end_per_group/2, 
	 big/1, tiny/1, simple/1, message/1, distributed/1, port/1,
	 ip_port/1, file_port/1, file_port2/1, file_port_schedfix/1,
	 ip_port_busy/1, wrap_port/1, wrap_port_time/1,
	 with_seq_trace/1, dead_suspend/1, local_trace/1,
	 saved_patterns/1, tracer_exit_on_stop/1,
         erl_tracer/1, distributed_erl_tracer/1]).
-export([init_per_testcase/2, end_per_testcase/2]).
-export([tracee1/1, tracee2/1]).
-export([dummy/0, exported/1]).
-export([enabled/3, trace/6, load_nif/1]).

-include_lib("common_test/include/ct.hrl").
-define(default_timeout, ?t:minutes(1)).

init_per_testcase(_Case, Config) ->
    ?line Dog=test_server:timetrap(?default_timeout),
    [{watchdog, Dog}|Config].
end_per_testcase(_Case, Config) ->
    Dog=?config(watchdog, Config),
    test_server:timetrap_cancel(Dog),
    ok.

suite() -> [{ct_hooks,[ts_install_cth]}].

all() -> 
    [big, tiny, simple, message, distributed, port, ip_port,
     file_port, file_port2, file_port_schedfix, ip_port_busy,
     wrap_port, wrap_port_time, with_seq_trace, dead_suspend,
     local_trace, saved_patterns, tracer_exit_on_stop,
     erl_tracer, distributed_erl_tracer].

groups() -> 
    [].

init_per_suite(Config) ->
    Config.

end_per_suite(_Config) ->
    ok.

init_per_group(_GroupName, Config) ->
    Config.

end_per_group(_GroupName, Config) ->
    Config.


big(suite) -> [];
big(doc) -> ["Rudimentary interface test"];
big(Config) when is_list(Config) ->
	?line {ok,OldCurDir} = file:get_cwd(),
	Datadir=?config(data_dir, Config),
	Privdir=?config(priv_dir, Config),
	?line ok=file:set_cwd(Privdir),
    try
	%% make sure dbg is stopped (and returns correctly)
	?line ok = dbg:stop(),

	%% compile test module and make sure it is loaded.
	?line {ok,Mod} = compile:file(Datadir++"/dbg_test",[trace]),
	?line code:purge(dbg_test),
	?line {module, Mod}=code:load_file(dbg_test),

	%% run/debug a named test function.
	?line Pid = spawn_link(dbg_test, loop, [Config]),
	?line true = register(dbg_test_loop, Pid),
	?line {ok,_} = dbg:tracer(),
	?line {ok,[{matched, _node, 1}]} = dbg:p(dbg_test_loop, [m,p,c]),
	?line ok = dbg:c(dbg_test, test, [Config]),
	?line ok = dbg:i(),
	?line dbg_test_loop ! {dbg_test, stop},
	unregister(dbg_test_loop),
	?line ok = dbg:stop(),

	%% run/debug a Pid.
	?line Pid2=spawn_link(dbg_test,loop,[Config]),
	?line {ok,_} = dbg:tracer(),
	?line {ok,[{matched, _node, 1}]} = dbg:p(Pid2,[s,r,p]),
	?line ok = dbg:c(dbg_test, test, [Config]),
	?line ok = dbg:i(),
	?line Pid2 ! {dbg_test, stop},

	?line ok=file:set_cwd(OldCurDir)
    after
	?line dbg:stop()
    end,
    ok.


tiny(suite) -> [];
tiny(doc) -> ["Rudimentary interface test"];
tiny(Config) when is_list(Config) ->
    ?line {ok,OldCurDir} = file:get_cwd(),
    Datadir=?config(data_dir, Config),
    Privdir=?config(priv_dir, Config),
    ?line ok=file:set_cwd(Privdir),
    try
	%% compile test module and make sure it is loaded.
	?line {ok, Mod} = compile:file(Datadir++"/dbg_test",[trace]),
	?line code:purge(dbg_test),
	?line {module, Mod}=code:load_file(dbg_test),

	?line Pid=spawn_link(dbg_test,loop,[Config]),
	if
	    is_pid(Pid) ->
		?line dbg:tracer(),
		?line {ok,[{matched, _node, 1}]} = dbg:p(Pid,[s,r,m,p,c]),
		?line ok = dbg:c(dbg_test,test,[Config]),
		?line ok = dbg:i(),
		?line Pid ! {dbg_test, stop};
	    true ->
		?line ok=file:set_cwd(OldCurDir),
		?t:fail("Could not spawn external test process.~n"),
		failure
	end
    after
	?line ok = dbg:stop(),
        ?line ok = file:set_cwd(OldCurDir)
    end,
    ok.

simple(suite) ->
    [];
simple(doc) ->
    ["Simple interface test with own handler"];
simple(Config) when is_list(Config) ->
    try
	?line start(),
	?line dbg:p(self(),call),
	?line dbg:tp(dbg,ltp,[]),
	?line dbg:ltp(),
	?line stop(),
	?line S = self(),
	?line [{trace,S,call,{dbg,ltp,[]}}] = flush()
    after
	?line dbg:stop()
    end,
    ok.

message(suite) ->
    [];
message(doc) ->
    ["Simple interface test with pam code that appends a message"];
message(Config) when is_list(Config) ->
    ?line {ok, _} = start(),
    try
	?line {ok, [{matched, _node, 1}]} = dbg:p(self(),call),
	?line {ok, X} = dbg:tp(dbg,ltp,[{'_',[],[{message, {self}}]}]),
	?line {value, {saved, Saved}} = lists:keysearch(saved, 1, X),
	?line {ok, Y} = dbg:tp(dbg,ln,Saved),
	?line {value, {saved, Saved}} = lists:keysearch(saved, 1, Y),
	?line ok = dbg:ltp(),
	?line ok = dbg:ln()
    after
	?line stop()
    end,
    ?line S = self(),
    ?line [{trace,S,call,{dbg,ltp,[]},S},
	   {trace,S,call,{dbg,ln,[]},S}] = flush(),
    ok.

distributed(suite) ->
    [];
distributed(doc) ->
    ["Simple test of distributed tracing"];
distributed(Config) when is_list(Config) ->
    ?line {ok, _} = start(),
    ?line Node = start_slave(),
    try
	?line RexPid = rpc:call(Node, erlang, whereis, [rex]),
	?line RexPidList = pid_to_list(RexPid),
	?line {ok, Node} = dbg:n(Node),
	?line {ok, X} = dbg:p(all,call),
	?line {value, {matched, Node, _}} = lists:keysearch(Node, 2, X),
	?line {ok, Y} = dbg:p(RexPidList, s),
	?line {value, {matched, Node, 1}} = lists:keysearch(Node, 2, Y),
	?line {ok, Z} = dbg:tp(dbg,ltp,[]),
	?line {value, {matched, Node, 1}} = lists:keysearch(Node, 2, Z),
	?line dbg:cn(Node),
	?line dbg:tp(dbg,ln,[]),
	?line ok = rpc:block_call(Node, dbg, ltp, []),
	?line ok = rpc:block_call(Node, dbg, ln, []),
	?line ok = dbg:ln(),
	?line S = self(),
	?line {TraceSend, TraceCall} =
	lists:partition(fun ({trace,RP,send,_,_}) when RP =:= RexPid -> true;
			    (_) -> false end,
			flush()),
	?line [_|_] = TraceSend,
	?line [{trace,Pid,call,{dbg,ltp,[]}},
	       {trace,S,call,{dbg,ln,[]}}] = TraceCall,
	?line Node = node(Pid),
	%%
	?line stop()
    after
	?line stop_slave(Node),
        ?line stop()
    end,
    ok.


local_trace(suite) ->
    [];
local_trace(doc) ->
    ["Tests tracing of local function calls."];
local_trace(Config) when is_list(Config) ->
    ?line {ok, _} = start(),
    try
	?line S = self(),
	?line %% Split "<X.Y.Z>" into {X, Y, Z}
	?line "<"++L1 = L = pid_to_list(S),
	?line NoDot = fun ($.) -> false; (_) -> true end,
	?line {LX,"."++L2} = lists:splitwith(NoDot, L1),
	?line {LY,"."++L3} = lists:splitwith(NoDot, L2),
	?line ">"++L4 = lists:reverse(L3),
	?line LZ = lists:reverse(L4),
	?line X = 0 = list_to_integer(LX),
	?line Y = list_to_integer(LY),
	?line Z = list_to_integer(LZ),
	?line XYZ = {X, Y, Z},
	?line io:format("Self = ~w = ~w~n", [S,XYZ]),
	?line {ok, [{matched, _node, 1}]} = dbg:p(S,call),
	?line {ok, [{matched, _node, 1}]} = dbg:p(XYZ,call),
	if Z =:= 0 ->
		?line {ok, [{matched, _node, 1}]} = dbg:p(Y,call);
	   true -> ok
	end,
	?line {ok, [{matched, _node, 1}]} = dbg:p(L,call),
	?line {ok, _} = dbg:tpl(?MODULE,not_exported,[]),
	?line 4 = not_exported(2),
	?line [{trace,S,call,{?MODULE,not_exported,[2]}}] = flush(),
	?line {ok, _} = dbg:tp(?MODULE,exported,[]),
	?line 4 = ?MODULE:exported(2),
	?line [{trace,S,call,{?MODULE,exported,[2]}},
	       {trace,S,call,{?MODULE,not_exported,[2]}}] = flush(),
	?line {ok, _} = dbg:ctpl(?MODULE),
	?line 4 = ?MODULE:exported(2),
	?line [{trace,S,call,{?MODULE,exported,[2]}}] = flush(),
	?line {ok, _} = dbg:tpl(?MODULE,not_exported,[]),
	?line {ok, _} = dbg:ctp(?MODULE),
	?line 4 = ?MODULE:exported(2),
	?line [] = flush(),
	?line {ok, _} = dbg:tpl(?MODULE,not_exported,x),
	?line catch ?MODULE:exported(x),
	?line [{trace,S,call,{dbg_SUITE,not_exported,[x]}},
	       {trace,S,exception_from,
		{dbg_SUITE,not_exported,1},
		{error,badarith}}] = flush()
    after
	?line stop()
    end,
    ok.

port(suite) ->
    [];
port(doc) ->
    ["Test that tracing on port works"];
port(Config) when is_list(Config) ->
    try
        S = self(),
	start(),
        TestFile = filename:join(proplists:get_value(priv_dir, Config),"port_test"),
        Fun = dbg:trace_port(file, TestFile),

        %% Do a run to get rid of all extra port operations
        port_close(Fun()),

	dbg:p(new,ports),
        Port = Fun(),
        port_close(Port),
	stop(),

        TraceFileDrv = list_to_atom(lists:flatten(["trace_file_drv n ",TestFile])),
	[{trace,Port,open,S,TraceFileDrv},
         {trace,Port,getting_linked,S},
         {trace,Port,closed,normal},
         {trace,Port,unlink,S}] = flush()
    after
	dbg:stop()
    end,
    ok.

saved_patterns(suite) ->
    [];
saved_patterns(doc) ->
    ["Tests saving of match_spec's."];
saved_patterns(Config) when is_list(Config) ->
    ?line dbg:stop(),
    ?line {ok,[{saved,1}]} =
	dbg:tp(dbg,ctp,1,[{'_',[],[{message, blahonga}]}]),
    ?line {ok,[{saved,2}]} =
	dbg:tp(dbg,ctp,1,[{['_'],[],[{message, blahonga}]}]),
    ?line Privdir=?config(priv_dir, Config),
    ?line file:make_dir(Privdir),
    ?line File = filename:join([Privdir, "blahonga.ms"]),
    ?line dbg:wtp(File),
    ?line dbg:stop(),
    ?line dbg:ctp('_','_','_'),
    ?line {ok, _} = start(),
    try
	?line dbg:rtp(File),
	?line {ok,[{matched,_node,1},{saved,1}]} = dbg:tp(dbg,ltp,0,1),
	?line {ok, [{matched, _node, 1}]} = dbg:p(self(),call),
	?line dbg:ltp(),
	?line S = self(),
	?line [{trace,S,call,{dbg,ltp,[]},blahonga}] = flush()
    after
	?line stop()
    end,
    ok.



not_exported(N) ->
    N * 2.

exported(N) ->
    not_exported(N).

ip_port(suite) ->
    [];
ip_port(doc) ->
    ["Test tracing to IP port"];
ip_port(Config) when is_list(Config) ->
    ?line stop(),
    ?line Port = dbg:trace_port(ip, 0),
    ?line {ok, _} = dbg:tracer(port, Port),
    try
	?line {ok, [{matched, _node, 1}]} = dbg:p(self(),call),
	?line {ok, X} = dbg:tp(dbg, ltp,[{'_',[],[{message, {self}}]}]),
	?line {value, {saved, _Saved}} = lists:keysearch(saved, 1, X),
	?line {ok, Y} = dbg:tp(dbg, ln, [{'_',[],[{message, hej}]}]),
	?line {value, {saved, _}} = lists:keysearch(saved, 1, Y),
	?line ok = dbg:ltp(),
	?line ok = dbg:ln(),
	?line {ok, IpPort} = dbg:trace_port_control(get_listen_port),
	?line io:format("IpPort = ~p~n", [IpPort]),
	?line dbg:trace_client(ip, IpPort, {fun myhandler/2, self()}),
	?line S = self(),
	?line [{trace,S,call,{dbg,ltp,[]},S},
	       {trace,S,call,{dbg,ln,[]},hej}] = flush()
    after
	?line stop()
    end,
    ok.



ip_port_busy(suite) ->
    [];
ip_port_busy(doc) ->
    ["Test that the dbg server does not hang if the tracer don't start ",
     "(OTP-3592)"];
ip_port_busy(Config) when is_list(Config) ->
    ?line stop(),
    ?line Tracer = dbg:trace_port(ip, 4745),
    ?line Port = Tracer(),
    ?line {error, Reason} = dbg:tracer(port, Tracer),
    try
	?line io:format("Error reason = ~p~n", [Reason]),
	?line true = port_close(Port)
    after
	?line dbg:stop()
    end,
    ?line ok.



file_port(suite) ->
    [];
file_port(doc) ->
    ["Test tracing to file port (simple)"];
file_port(Config) when is_list(Config) ->
    ?line stop(),
    ?line {A,B,C} = erlang:now(),
    ?line FTMP =  atom_to_list(?MODULE) ++ integer_to_list(A) ++ "-" ++
	integer_to_list(B) ++ "-" ++ integer_to_list(C),
    ?line FName = filename:join([?config(data_dir, Config), FTMP]),
    ?line Port = dbg:trace_port(file, FName),
    ?line {ok, _} = dbg:tracer(port, Port),
    try
	?line {ok, [{matched, _node, 1}]} = dbg:p(self(),call),
	?line {ok, X} = dbg:tp(dbg, ltp,[{'_',[],[{message, {self}}]}]),
	?line {value, {saved, _Saved}} = lists:keysearch(saved, 1, X),
	?line {ok, Y} = dbg:tp(dbg, ln, [{'_',[],[{message, hej}]}]),
	?line {value, {saved, _}} = lists:keysearch(saved, 1, Y),
	?line ok = dbg:ltp(),
	?line ok = dbg:ln(),
	?line stop(),
	?line dbg:trace_client(file, FName, {fun myhandler/2, self()}),
	?line S = self(),
	?line [{trace,S,call,{dbg,ltp,[]},S},
	       {trace,S,call,{dbg,ln,[]},hej},
	       end_of_trace] = flush()
    after
	?line stop(),
        ?line file:delete(FName)
    end,
    ok.

file_port2(suite) ->
    [];
file_port2(doc) ->
    ["Test tracing to file port with 'follow_file'"];
file_port2(Config) when is_list(Config) ->
    stop(),
    {A,B,C} = erlang:now(),
    FTMP =  atom_to_list(?MODULE) ++ integer_to_list(A) ++
	"-" ++ integer_to_list(B) ++ "-" ++ integer_to_list(C),
    FName = filename:join([?config(data_dir, Config), FTMP]),
    %% Ok, lets try with flush and follow_file, not a chance on VxWorks
    %% with NFS caching...
    Port2 = dbg:trace_port(file, FName),
    {ok, _} = dbg:tracer(port, Port2),
    try
	{ok, [{matched, _node, 1}]} = dbg:p(self(),call),
	{ok, _} = dbg:tp(dbg, ltp,[{'_',[],[{message, {self}}]}]),
	{ok, _} = dbg:tp(dbg, ln, [{'_',[],[{message, hej}]}]),
	ok = dbg:ltp(),
	ok = dbg:flush_trace_port(),
	dbg:trace_client(follow_file, FName,
	  	       {fun myhandler/2, self()}),
	S = self(),
	[{trace,S,call,{dbg,ltp,[]},S}] = flush(),
	ok = dbg:ln(),
	ok = dbg:flush_trace_port(),
	receive after 1000 -> ok end, %% Polls every second...
	[{trace,S,call,{dbg,ln,[]},hej}] = flush(),
	stop(),
	[] = flush()
    after
	stop(),
	file:delete(FName)
    end,
    ok.

file_port_schedfix(suite) ->
    [];
file_port_schedfix(doc) ->
    ["Test that the scheduling timestamp fix for trace flag 'running' works."];
file_port_schedfix(Config) when is_list(Config) ->
    ?line case (catch erlang:system_info(smp_support)) of
	      true ->
		  {skip, "No schedule fix on SMP"};
	      _ ->
		  try
		      file_port_schedfix1(Config)
		  after
		      dbg:stop()
		  end
	  end.
file_port_schedfix1(Config) when is_list(Config) ->
    ?line stop(),
    ?line {A,B,C} = erlang:now(),
    ?line FTMP =  atom_to_list(?MODULE) ++ integer_to_list(A) ++
	"-" ++ integer_to_list(B) ++ "-" ++ integer_to_list(C),
    ?line FName = filename:join([?config(data_dir, Config), FTMP]),
    %%
    ?line Port = dbg:trace_port(file, {FName, wrap, ".wraplog", 8*1024, 4}),
    ?line {ok, _} = dbg:tracer(port, Port),
    ?line {ok,[{matched,_node,0}]} = dbg:p(new,[running,procs,send,timestamp]),
    %%
    %% Generate the trace data
    %%
    %% This starts 3 processes that sends a message to each other in a ring,
    %% 4 laps. Prior to sending the message to the next in the ring, each
    %% process send 8 messages to itself, just to generate some trace data,
    %% and to lower the possibility that the trace log wraps just after
    %% a schedule out message (which would not burden any process and hence
    %% not show up in the result)
    %%
    %% The wrap file trace is used because it burns a lot of time when the
    %% driver swaps files, a lot more than the regular file trace. The test
    %% case is dimensioned so that the log fills two files and just starts
    %% on the third (out of four wrap files). This gives two file swaps,
    %% and there are three processes, so one process will NOT be burdened.
    %% The criterion for trace success is then that the max process
    %% execution time must not be more than twice the min process
    %% execution time. Wallclock. A normal result is about 10 times more
    %% without schedule in - schedule out compensation (OTP-3938).
    %%
    ?line ok = token_volleyball(3, 4, 8),
    %%
    ?line {ok,[{matched,_,_}]} = dbg:p(all, [clear]),
    ?line stop(),
    % Some debug code to run on all platforms, for finding the fault on genny
    % Dont touch please /PaN
    ?line io:format("Trace dump by PaN BEGIN~n"),
    ?line dbg:trace_client(file,{FName, wrap, ".wraplog"},{fun(end_of_trace,Pid)-> Pid ! done; (Mesg,Pid) -> io:format("~w~n",[Mesg]),Pid end,self()}),
    receive done -> ok end,
    ?line io:format("Trace dump by PaN END~n"),
      %%
    %% Get the trace result
    %%
    ?line Tag = make_ref(),
    ?line dbg:trace_client(file, {FName, wrap, ".wraplog"},
			   {fun schedstat_handler/2, {self(), Tag, []}}),
    ?line Result =
	receive
	    {Tag, D} ->
		lists:map(
		  fun({Pid, {A1, B1, C1}}) ->
			  {Pid, C1/1000000 + B1 + A1*1000000}
		  end,
		  D)
	end,
    ?line ok = io:format("Result=~p", [Result]),
%    erlang:display({?MODULE, ?LINE, Result}),
    %%
    %% Analyze the result
    %%
    ?line {Min, Max} =
	lists:foldl(
	  fun({_Pid, M}, {Mi, Ma}) ->
		  {if M < Mi -> M; true -> Mi end,
		   if M > Ma -> M; true -> Ma end}
	  end,
	  {void, 0},
	  Result),
    % More PaN debug
    ?line io:format("Min = ~f, Max = ~f~n",[Min,Max]),
    %%
    %% Cleanup
    %%
    ?line ToBeDeleted = filelib:wildcard(FName++"*"++".wraplog"),
    ?line lists:map(fun file:delete/1, ToBeDeleted),
%    io:format("ToBeDeleted=~p", [ToBeDeleted]),
    %%
    %% Present the result
    %%
    P = (Max / Min - 1) * 100,
    BottomLine = lists:flatten(io_lib:format("~.2f %", [P])),
    if P > 100 ->
	    Reason = {BottomLine, '>', "100%"},
	    erlang:display({file_port_schedfix, fail, Reason}),
	    test_server:fail(Reason);
       true ->
	    {comment, BottomLine}
    end.

wrap_port(suite) ->
    [];
wrap_port(doc) ->
    ["Test tracing to wrapping file port"];
wrap_port(Config) when is_list(Config) ->
    ?line Self = self(),
    ?line stop(),
    ?line {A,B,C} = erlang:now(),
    ?line FTMP =  atom_to_list(?MODULE) ++ integer_to_list(A) ++ "-" ++
	integer_to_list(B) ++ "-" ++ integer_to_list(C) ++ "-",
    ?line FName = filename:join([?config(data_dir, Config), FTMP]),
    ?line FNameWildcard = FName++"*"++".trace",
    %% WrapSize=0 and WrapCnt=11 will force the trace to wrap after
    %% every trace message, and to contain only the last 10 entries
    %% after trace stop since the last file will be empty waiting
    %% for its first trace message.
    ?line WrapSize = 0,
    ?line WrapCnt = 11,
    ?line WrapFilesSpec = {FName, wrap, ".trace", WrapSize, WrapCnt},
    ?line wrap_port_init(WrapFilesSpec),
    %% The number of iterations, N, is tested to place wrap the log,
    %% giving a gap in the filename sequence at index 3.
    %% This should be a difficult case for
    %% the trace_client file sorting functionality.
    N = 7,
    ?line lists:foreach(
	    fun(Cnt) ->
		    ?MODULE:tracee1(Cnt),
		    ?MODULE:tracee2(Cnt)
	    end,
	    lists:seq(1, N)),
    ?line stop(),
    try
	?line Files1 = filelib:wildcard(FNameWildcard),
	?line io:format("~p~n", [Files1]),
	?line Tc1 = dbg:trace_client(file, WrapFilesSpec,
				     {fun myhandler/2, {wait_for_go,Self}}),
	?line Tref1 = erlang:monitor(process, Tc1),
	Tc1 ! {go,Self},
	?line [{'DOWN',Tref1,_,_,normal},
	       end_of_trace
	       |Result] = lists:reverse(flush()),
	?line M = N - (WrapCnt-1) div 2,
	?line M = wrap_port_result(Result, Self, N),
	%%
	%% Start a new wrap log with the same name to verify that
	%% all files are cleared at wrap log start. Only produce
	%% two trace messages to also place the gap at index 3,
	%% so the trace log will be misinterpreted.
	%%
	?line wrap_port_init(WrapFilesSpec),
	?line Files2 = filelib:wildcard(FNameWildcard),
	?line io:format("~p~n", [Files2]),
	?line -1 = ?MODULE:tracee1(-1),
	?line -1 = ?MODULE:tracee2(-1),
	?line stop(),
	?line Files = filelib:wildcard(FNameWildcard),
	?line io:format("~p~n", [Files]),
	?line Tc2 = dbg:trace_client(file, WrapFilesSpec,
				     {fun myhandler/2, {wait_for_go,Self}}),
	?line Tref2 = erlang:monitor(process, Tc2),
	Tc2 ! {go,Self},
	?line [{trace,Self,call,{?MODULE,tracee1,[-1]},Self},
	       {trace,Self,call,{?MODULE,tracee2,[-1]},hej},
	       end_of_trace,
	       {'DOWN',Tref2,_,_,normal}] = flush(),
	%%
	?line lists:map(fun(F) -> file:delete(F) end, Files)
    after
	?line stop()
    end,
    ok.

wrap_port_init(WrapFilesSpec) ->
    ?line Port = dbg:trace_port(file, WrapFilesSpec),
    ?line {ok, _} = dbg:tracer(port, Port),
    ?line {ok, [{matched, _node, 1}]} = dbg:p(self(),call),
    ?line {ok, X} = dbg:tp(?MODULE, tracee1,[{'_',[],[{message, {self}}]}]),
    ?line {value, {saved, _Saved}} = lists:keysearch(saved, 1, X),
    ?line {ok, Y} = dbg:tp(?MODULE, tracee2, [{'_',[],[{message, hej}]}]),
    ?line {value, {saved, _}} = lists:keysearch(saved, 1, Y),
    ok.

tracee1(X) ->
    X.

tracee2(X) ->
    X.

wrap_port_result([], _S, M) ->
    M;
wrap_port_result([{trace, S, call, {?MODULE, tracee2, [M]}, hej},
		  {trace, S, call, {?MODULE, tracee1, [M]}, S} | Tail],
		 S,
		 M) ->
    wrap_port_result(Tail, S, M-1).


wrap_port_time(suite) ->
    [];
wrap_port_time(doc) ->
    ["Test tracing to time limited wrapping file port"];
wrap_port_time(Config) when is_list(Config) ->
    ?line stop(),
    ?line {A,B,C} = erlang:now(),
    ?line FTMP =  atom_to_list(?MODULE) ++ integer_to_list(A) ++ "-" ++
	integer_to_list(B) ++ "-" ++ integer_to_list(C) ++ "-",
    ?line FName = filename:join([?config(data_dir, Config), FTMP]),
    %% WrapTime=2 and WrapCnt=4 will force the trace to wrap after
    %% every 2 seconds, and to contain between 3*2 and 4*2 seconds
    %% of trace entries.
    ?line WrapFilesSpec = {FName, wrap, ".trace", {time, 2000}, 4},
    ?line Port = dbg:trace_port(file, WrapFilesSpec),
    ?line {ok, _} = dbg:tracer(port, Port),
    try
	?line {ok, [{matched, _node, 1}]} = dbg:p(self(),call),
	?line {ok, X} = dbg:tp(?MODULE, tracee1,[{'_',[],[{message, {self}}]}]),
	?line {value, {saved, _Saved1}} = lists:keysearch(saved, 1, X),
	?line {ok, Y} = dbg:tp(?MODULE, tracee2, [{'_',[],[{message, hej}]}]),
	?line {value, {saved, _Saved2}} = lists:keysearch(saved, 1, Y),
	%% The delays in the iterations places two trace messages in each
	%% trace file, but the last which is empty waiting for its first
	%% trace message. The number of iterations is chosen so that
	%% one trace file has been wasted, and therefore the first pair
	%% of trace messages.
	?line lists:foreach(
		fun(Cnt) ->
			receive after 1000 -> ok end,
			?MODULE:tracee1(Cnt),
			?MODULE:tracee2(Cnt),
			receive after 1100 -> ok end
		end,
		lists:seq(1, 4)),
	?line stop(),
	?line Files = filelib:wildcard(FName ++ "*" ++ ".trace"),
	?line io:format("~p~n", [Files]),
	?line dbg:trace_client(file, WrapFilesSpec, {fun myhandler/2, self()}),
	?line S = self(),
	?line [{trace, S, call, {?MODULE, tracee1, [2]}, S},
	       {trace, S, call, {?MODULE, tracee2, [2]}, hej},
	       {trace, S, call, {?MODULE, tracee1, [3]}, S},
	       {trace, S, call, {?MODULE, tracee2, [3]}, hej},
	       {trace, S, call, {?MODULE, tracee1, [4]}, S},
	       {trace, S, call, {?MODULE, tracee2, [4]}, hej},
	       end_of_trace] = flush(),
	?line lists:map(fun(F) -> file:delete(F) end, Files)
    after
	?line stop()
    end,
    ok.

with_seq_trace(suite) ->
    [];
with_seq_trace(doc) ->
    ["Test ordinary tracing combined with seq_trace"];
with_seq_trace(Config) when is_list(Config) ->
    try
	?line {ok, Server} = start(),
	?line {ok, Tracer} = dbg:get_tracer(),
	?line {ok, X} = dbg:tp(dbg, get_tracer, [{[],[],
						  [{set_seq_token, send, true}]}]),
	?line {value, {saved, _}} = lists:keysearch(saved, 1, X),
	?line {ok, [{matched, _node, 1}]} = dbg:p(self(),call),
	?line seq_trace:set_system_tracer(Tracer),
	?line dbg:get_tracer(),
	receive
	    after 1 ->
		    ok
	    end,
	?line S = self(),
	?line ThisNode = node(),
	?line [{trace,S,call,{dbg,get_tracer,[]}},
	       {seq_trace,0,{send,_,S,Server,{S,{get_tracer,ThisNode}}}},
	       {seq_trace,0,{send,_,Server,S,{dbg,{ok,Tracer}}}}] =
	flush()
    after
	?line stop()
    end,
    ok.

dead_suspend(suite) ->
    [];
dead_suspend(doc) ->
    ["Test that trace messages concerning a now dead process does "
     "not crash dbg."];

dead_suspend(Config) when is_list(Config) ->
    ?line start(),
    try
	survived = run_dead_suspend()
    after
	?line stop()
    end.

run_dead_suspend() ->
    dbg:p(new, call),
    dbg:tp(?MODULE, dummy, []),
    spawn(?MODULE, dummy, []),
    spawn(?MODULE, dummy, []),
    spawn(?MODULE, dummy, []),
    spawn(?MODULE, dummy, []),
    spawn(?MODULE, dummy, []),
    receive after 1000 -> ok end,
    case whereis(dbg) of
	undefined ->
	    died;
	_ ->
	    survived
    end.

dummy() ->
    ok.

%% Test that a tracer process does not ignore an exit signal message when it has
%% received (but not handled) trace messages
tracer_exit_on_stop(_) ->
    %% Tracer blocks waiting for fun to complete so that the trace message and
    %% the exit signal message from the dbg process are in its message queue.
    Fun = fun() ->
	    ?MODULE:dummy(),
	    Ref = erlang:trace_delivered(self()),
	    receive {trace_delivered, _, Ref} -> stop() end
	end,
    {ok, _} = dbg:tracer(process, {fun spawn_once_handler/2, {self(), Fun}}),
    {ok, Tracer} = dbg:get_tracer(),
    MRef = monitor(process, Tracer),
    {ok, _} = dbg:p(self(), [call]),
    {ok, _} = dbg:p(new, [call]),
    {ok, _} = dbg:tp(?MODULE, dummy, []),
    ?MODULE:dummy(),
    receive {'DOWN', MRef, _, _, normal} -> ok end,
    [{trace,_,call,{?MODULE, dummy,[]}},
     {trace,_,call,{?MODULE, dummy,[]}}] = flush(),
    ok.

spawn_once_handler(Event, {Pid, done} = State) ->
    Pid ! Event,
    State;
spawn_once_handler(Event, {Pid, Fun}) ->
    {_, Ref} = spawn_monitor(Fun),
    receive
	{'DOWN', Ref, _, _, _} ->
	    Pid ! Event,
	    {Pid, done}
    end.

%% Test that erl_tracer modules work correctly
erl_tracer(Config) ->
    stop(),

    ok = load_nif(Config),

    Self = self(),
    {ok, _} = dbg:tracer(module, {?MODULE, Self}),
    {ok, {?MODULE, Self}} = dbg:get_tracer(),
    {ok, _} = dbg:p(self(), [c, timestamp]),
    {ok, _} = dbg:tp(?MODULE, dummy, []),
    ok = ?MODULE:dummy(),
    [{Self, call, Self, Self, {?MODULE, dummy, []}, undefined, #{}}] = flush(),
    ok.

%% Test that distributed erl_tracer modules work
distributed_erl_tracer(Config) ->
    stop(),

    S = self(),

    ok = load_nif(Config),

    LNode = node(),
    RNode = start_slave(),
    true = rpc:call(RNode, code, add_patha, [filename:join(proplists:get_value(data_dir, Config), "..")]),
    ok = rpc:call(RNode, ?MODULE, load_nif, [Config]),

    NifProxy = fun() ->
                       register(nif_proxy, self()),
                       receive M -> S ! M end
               end,

    LNifProxy = spawn_link(LNode, NifProxy),
    RNifProxy = spawn_link(RNode, NifProxy),

    TracerFun = fun() -> {?MODULE, whereis(nif_proxy)} end,

    {ok, _} = dbg:tracer(LNode, module, TracerFun),
    {ok, _} = dbg:tracer(RNode, module, TracerFun),

    {ok, [{matched, _, _}, {matched, _, _}]} = dbg:p(all,c),
    {ok, [_, _]} = dbg:tp(?MODULE, dummy, []),

    {ok, {?MODULE, LNifProxy}} = dbg:get_tracer(LNode),
    {ok, {?MODULE, RNifProxy}} = dbg:get_tracer(RNode),

    LCall = spawn_link(LNode, fun() -> ?MODULE:dummy() end),
    [{LCall, call, LNifProxy, LCall, {?MODULE, dummy, []}, undefined, #{}}] = flush(),

    RCall = spawn_link(RNode, fun() -> ?MODULE:dummy() end),
    [{RCall, call, RNifProxy, RCall, {?MODULE, dummy, []}, undefined, #{}}] = flush(),


    ok.

load_nif(Config) ->
    SoFile = atom_to_list(?MODULE),
    DataDir = proplists:get_value(data_dir, Config),
    case erlang:load_nif(filename:join(DataDir, SoFile) , 0) of
        {error, {reload, _}} ->
            ok;
        ok ->
            ok
    end.

enabled(_, _, _) ->
    erlang:nif_error(nif_not_loaded).

trace(_, _, _, _, _, _) ->
    erlang:nif_error(nif_not_loaded).

%%
%% Support functions
%%

start_slave() ->
    {A, B, C} = now(),
    Name = "asdkxlkmd" ++ integer_to_list(A+B+C),
    {ok, Node} = test_server:start_node(Name,slave,[]),
    ok = wait_node(Node, 15),
    Node.

stop_slave(Node) ->
    test_server:stop_node(Node).

wait_node(_,0) ->
    no;
wait_node(Node, N) ->
    case net_adm:ping(Node) of
	pong ->
	    ok;
	pang ->
	    receive
	    after 1000 ->
		    ok
	    end,
	    wait_node(Node, N - 1)
    end.

myhandler(Message, {wait_for_go,Pid}) ->
    receive
	{go,Pid} ->
	    myhandler(Message, Pid)
    end;
myhandler(Message, Relay) ->
    Relay ! Message,
    case Message of
	end_of_trace ->
	    ok;
	_ ->
	    Relay
    end.

flush() ->
    flush([]).
flush(Acc) ->
    receive
	X ->
	    flush(Acc ++ [X])
    after 1000 ->
	    Acc
    end.

start() ->
    stop(),
    dbg:tracer(process, {fun myhandler/2, self()}).

stop() ->
    dbg:stop().



schedstat_handler(TraceMsg, {Parent, Tag, Data} = State) ->
    case TraceMsg of
	{trace_ts, Pid, in, _, Ts} ->
	    NewData =
		case lists:keysearch(Pid, 1, Data) of
		    {value, {Pid, Acc}} ->
			[{Pid, Acc, Ts} | lists:keydelete(Pid, 1, Data)];
		    false ->
			[{Pid, {0, 0, 0}, Ts} | Data];
		    Other ->
			exit(Parent, {?MODULE, ?LINE, Other}),
			erlang:display({?MODULE, ?LINE, Other}),
			Data
		end,
	    {Parent, Tag, NewData};
	{trace_ts, Pid, out, _, {A3, B3, C3}} ->
	    NewData =
		case lists:keysearch(Pid, 1, Data) of
		    {value, {Pid, {A1, B1, C1}, {A2, B2, C2}}} ->
			[{Pid, {A3-A2+A1, B3-B2+B1, C3-C2+C1}} |
			 lists:keydelete(Pid, 1, Data)];
		    Other ->
			exit(Parent, {?MODULE, ?LINE, Other}),
			erlang:display({?MODULE, ?LINE, Other}),
			Data
		end,
	    {Parent, Tag, NewData};
	{trace_ts, Pid, exit, normal, {A3, B3, C3}} ->
	    NewData =
		case lists:keysearch(Pid, 1, Data) of
		    {value, {Pid, {A1, B1, C1}, {A2, B2, C2}}} ->
			[{Pid, {A3-A2+A1, B3-B2+B1, C3-C2+C1}} |
			 lists:keydelete(Pid, 1, Data)];
		    {value, {Pid, _Acc}} ->
			Data;
		    false ->
			[{Pid, {0, 0, 0}} | Data];
		    Other ->
			exit(Parent, {?MODULE, ?LINE, Other}),
			erlang:display({?MODULE, ?LINE, Other}),
			Data
		end,
	    {Parent, Tag, NewData};
	{trace_ts, _Pid, send, _Msg, _OtherPid, _Ts} ->
	    State;
	end_of_trace ->
	    Parent ! {Tag, Data},
	    State
    end.



pass_token(Token, Next, Loops) ->
    receive
	{Token, 1} = Msg ->
	    sendloop(Loops),
	    Next ! Msg;
	{Token, _Cnt} = Msg->
	    sendloop(Loops),
	    Next ! Msg,
	    pass_token(Token, Next, Loops)
    end.

pass_token(Token, Final, Cnt, Loops) ->
    receive
	{Token, start, Next} ->
	    sendloop(Loops),
	    Msg = {Token, Cnt},
	    Next ! Msg,
	    pass_token(Token, Final, Next, Cnt, Loops)
    end.

pass_token(Token, Final, Next, Cnt, Loops) ->
    receive
	{Token, 1} ->
	    sendloop(Loops),
	    Msg = {Token, done},
	    Final ! Msg;
	{Token, Cnt} ->
	    sendloop(Loops),
	    NextCnt = Cnt-1,
	    Msg = {Token, NextCnt},
	    Next ! Msg,
	    pass_token(Token, Final, Next, NextCnt, Loops)
    end.

sendloop(Loops) ->
    sendloop(make_ref(), Loops).

sendloop(_Tag, 0) ->
    ok;
sendloop(Tag, Loops) ->
    self() ! {Tag, Loops},
    receive {Tag, Loops} -> ok end,
    sendloop(Tag, Loops-1).

token_volleyball(N, Cnt, Loops)
  when is_integer(N), N >= 1, is_integer(Cnt), Cnt >= 1,
       is_integer(Loops), Loops >= 0 ->
    Self = self(),
    Token = make_ref(),
    Last = spawn_link(fun() -> pass_token(Token, Self, Cnt, Loops) end),
    First = token_volleyball(Token, Last, N-1, Loops),
    Last ! {Token, start, First},
    receive {Token, done} -> ok end.

token_volleyball(Token, Next, 1, Loops) ->
    spawn_link(fun() -> pass_token(Token, Next, Loops) end);
token_volleyball(Token, Next, N, Loops) ->
    Pid = spawn_link(fun() -> pass_token(Token, Next, Loops) end),
    token_volleyball(Token, Pid, N-1, Loops).