aboutsummaryrefslogblamecommitdiffstats
path: root/erts/emulator/test/driver_SUITE.erl
blob: ffd08f22142bfef8da3c9274ed68973559235997 (plain) (tree)
1
2
3
4
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
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670


                   
                                                        
























                                                                         

                                                           
                             
                            
                        
        




                         
                          











                                          
        

























                                           
                                                    








































                                                                          
                                 
                                    
                                             


                                                            
                                         
 
         
                                                              











                                                          


                






                                                               
 



                         
                                                                         
 
                                     
           

                                    
           
 

                                                                                        



                                              













                                                                 

       

                                                     


                                                           

















































































































                                                                                





























































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                      



















































































































































































































































































































































































                                                                                   
                                                                             










































































































                                                                                            

                                                                            







                                                                           








                                                                             
                              
                                             



                                                  






                                                      
























































































































































































                                                                               
%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 1997-2011. 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%

%%% Purpose : Test interaction Erlang/Drivers (new features as of R3A)

%%% Checks that new features (as of R3) of the Erlang/Driver
%%% implementation works as expected.
%%%
%%% Things that should be tested:
%%% - outputv
%%% - timeouts
%%% - queueing

-module(driver_SUITE).
-export([all/0, suite/0,groups/0,init_per_suite/1, 
	 end_per_suite/1, init_per_group/2,end_per_group/2,
	 init_per_testcase/2,
	 end_per_testcase/2,
	 outputv_echo/1,
	
	 timer_measure/1,
	 timer_cancel/1,
	 timer_change/1,
	 timer_delay/1,
	 queue_echo/1,
	 outputv_errors/1,
	 driver_unloaded/1,
	 io_ready_exit/1,
	 use_fallback_pollset/1,
	 bad_fd_in_pollset/1,
	 driver_event/1,
	 fd_change/1,
	 steal_control/1,
	 otp_6602/1,
	 'driver_system_info_ver1.0'/1,
	 'driver_system_info_ver1.1'/1,
	 driver_system_info_current_ver/1,
	 driver_monitor/1,
	
	 ioq_exit_ready_input/1,
	 ioq_exit_ready_output/1,
	 ioq_exit_timeout/1,
	 ioq_exit_ready_async/1,
	 ioq_exit_event/1,
	 ioq_exit_ready_input_async/1,
	 ioq_exit_ready_output_async/1,
	 ioq_exit_timeout_async/1,
	 ioq_exit_event_async/1,
	 zero_extended_marker_garb_drv/1,
	 invalid_extended_marker_drv/1,
	 larger_major_vsn_drv/1,
	 larger_minor_vsn_drv/1,
	 smaller_major_vsn_drv/1,
	 smaller_minor_vsn_drv/1,
	 peek_non_existing_queue/1,
	 otp_6879/1,
	 caller/1,
	 many_events/1,
	 missing_callbacks/1,
	 smp_select/1,
	 driver_select_use/1,
	 thread_mseg_alloc_cache_clean/1]).

-export([bin_prefix/2]).

-include_lib("test_server/include/test_server.hrl").


% First byte in communication with the timer driver
-define(START_TIMER, 0).
-define(CANCEL_TIMER, 1).
-define(DELAY_START_TIMER, 2).
-define(TIMER, 3).
-define(CANCELLED, 4).

% First byte in communication with queue driver
-define(PUSHQ, 0).
-define(ENQ, 1).
-define(PUSHQ_BIN, 2).
-define(ENQ_BIN, 3).
-define(PUSHQV, 4).
-define(ENQV, 5).

-define(DEQ, 6).
-define(BYTES_QUEUED, 7).
-define(READ_HEAD, 8).

-define(RANDOM, random).

% Max data size that is queued in one instance
-define(MAX_DATA_SIZE, 16384).

% This is the allowed delay when testing the driver timer functionality
-define(delay, 100).

-define(heap_binary_size, 64).

init_per_testcase(Case, Config) when is_atom(Case), is_list(Config) ->
    Dog=?t:timetrap(?t:minutes(2)),
    case catch erts_debug:get_internal_state(available_internal_state) of
	true -> ok;
	_ -> erts_debug:set_internal_state(available_internal_state, true)
    end,
    erlang:display({init_per_testcase, Case}),
    ?line 0 = erts_debug:get_internal_state(check_io_debug),
    [{watchdog, Dog},{testcase, Case}|Config].

end_per_testcase(Case, Config) ->
    Dog = ?config(watchdog, Config),
    erlang:display({end_per_testcase, Case}),
    ?line 0 = erts_debug:get_internal_state(check_io_debug),
    ?t:timetrap_cancel(Dog).

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

all() -> 
    [outputv_errors, outputv_echo, queue_echo, {group, timer},
     driver_unloaded, io_ready_exit, use_fallback_pollset,
     bad_fd_in_pollset, driver_event, fd_change,
     steal_control, otp_6602, 'driver_system_info_ver1.0',
     'driver_system_info_ver1.1',
     driver_system_info_current_ver, driver_monitor,
     {group, ioq_exit}, zero_extended_marker_garb_drv,
     invalid_extended_marker_drv, larger_major_vsn_drv,
     larger_minor_vsn_drv, smaller_major_vsn_drv,
     smaller_minor_vsn_drv, peek_non_existing_queue,
     otp_6879, caller, many_events, missing_callbacks,
     smp_select, driver_select_use,
     thread_mseg_alloc_cache_clean].

groups() -> 
    [{timer, [],
      [timer_measure, timer_cancel, timer_delay,
       timer_change]},
     {ioq_exit, [],
      [ioq_exit_ready_input, ioq_exit_ready_output,
       ioq_exit_timeout, ioq_exit_ready_async, ioq_exit_event,
       ioq_exit_ready_input_async, ioq_exit_ready_output_async,
       ioq_exit_timeout_async, ioq_exit_event_async]}].

init_per_suite(Config) ->
    Config.

end_per_suite(_Config) ->
    catch erts_debug:set_internal_state(available_internal_state, false).

init_per_group(_GroupName, Config) ->
    Config.

end_per_group(_GroupName, Config) ->
    Config.

outputv_errors(doc) -> "Test sending bad types to port with an outputv-capable driver.";
outputv_errors(Config) when is_list(Config) ->
    ?line Path = ?config(data_dir, Config),
    ?line erl_ddll:start(),
    ?line ok = load_driver(Path, outputv_drv),

    outputv_bad_types(fun(T) ->
			      ?line outputv_errors_1(T),
			      ?line outputv_errors_1([1|T]),
			      ?line L = [1,2,3],
			      ?line outputv_errors_1([L,T]),
			      ?line outputv_errors_1([L|T])
		      end),
    outputv_errors_1(42),
    ok.

outputv_bad_types(Test) ->
    Types = [-1,256,atom,42.0,{a,b,c},make_ref(),fun() -> 42 end,
	     [1|2],<<1:1>>,<<1:9>>,<<1:15>>],
    _ = [Test(Type) || Type <- Types],
    ok.

outputv_errors_1(Term) ->
    Port = open_port({spawn_driver,outputv_drv}, []),
    {'EXIT',{badarg,_}} = (catch port_command(Port, Term)),
    port_close(Port).

outputv_echo(doc) -> ["Test echoing data with a driver that supports outputv."];
outputv_echo(Config) when is_list(Config) ->
    ?line Dog = test_server:timetrap(test_server:minutes(10)),
    Name = 'outputv_drv',
    P = start_driver(Config, Name, true),

    ?line ov_test(P, {bin,0}),
    ?line ov_test(P, {bin,1}),
    ?line ov_test(P, {bin,2}),
    ?line ov_test(P, {bin,3}),
    ?line ov_test(P, {bin,4}),
    ?line ov_test(P, {bin,5}),
    ?line ov_test(P, {bin,6}),
    ?line ov_test(P, {bin,7}),
    ?line ov_test(P, {bin,8}),
    ?line ov_test(P, {bin,15}),
    ?line ov_test(P, {bin,16}),
    ?line ov_test(P, {bin,17}),

    ?line ov_test(P, {list,0}),
    ?line ov_test(P, {list,1}),
    ?line ov_test(P, {list,2}),
    ?line ov_test(P, [int,int,{list,0},int]),
    ?line ov_test(P, [int,int,{list,1},int]),
    ?line ov_test(P, [int,int,{list,2}]),
    ?line ov_test(P, [{list,3},int,int,{list,2}]),
    ?line ov_test(P, {list,33}),

    ?line ov_test(P, [{bin,0}]),
    ?line ov_test(P, [{bin,1}]),
    ?line ov_test(P, [{bin,2}]),
    ?line ov_test(P, [{bin,3}]),
    ?line ov_test(P, [{bin,4}]),
    ?line ov_test(P, [{bin,5}]),
    ?line ov_test(P, [{bin,6},int]),
    ?line ov_test(P, [int,{bin,3}]),
    ?line ov_test(P, [int|{bin,4}]),
    ?line ov_test(P, [{bin,17},int,{bin,13}|{bin,3}]),

    ?line ov_test(P, [int,{bin,17},int,{bin,?heap_binary_size+1}|{bin,3}]),

    stop_driver(P, Name),
    ?line test_server:timetrap_cancel(Dog),
    ok.

ov_test(Port, Template) ->
    Self = self(),
    spawn_opt(erlang, apply, [fun () -> ov_test(Self, Port, Template) end,[]],
	      [link,{fullsweep_after,0}]),
    receive
	done -> ok
    end.

ov_test(Parent, Port, Template) ->
    true = port_connect(Port, self()),

    HeapData = build_data(Template),
    io:format("Mostly heap binaries"),
    ov_send_and_test(Port, HeapData, HeapData),

    %% Try sub binaries.
    io:format("Mostly sub binaries of heap binaries"),
    SubHeapData = make_sub_binaries(HeapData),
    ov_send_and_test(Port, SubHeapData, HeapData),

    %% Try refc binaries.
    io:format("Refc binaries"),
    RefcData = make_refc_binaries(HeapData),
    ov_send_and_test(Port, RefcData, RefcData),

    %% Try sub binaries of heap binaries.
    io:format("Sub binaries of refc binaries"),
    SubRefcData = make_sub_binaries(RefcData),
    ov_send_and_test(Port, SubRefcData, RefcData),
    io:format("", []),

    %% Garbage collect and make sure that there are no binaries left.
    %% R7 note:
    %%  - dead variables on the stack are killed after last use,
    %%  - erlang:garbage_collect/0 collects garbage immediately.
    %%  (there used to be dummy functions here)
    erlang:garbage_collect(),
    {binary,[]} = process_info(self(), binary),

    %% Reassign Port back to parent and tell him we are done.
    true = port_connect(Port, Parent),
    Parent ! done.

ov_send_and_test(Port, Data, ExpectedResult) ->
    io:format("~p ! ~P", [Port,Data,12]),
    Port ! {self(),{command,Data}},
    receive 
	{Port,{data,ReturnData}} ->
	    io:format("~p returned ~P", [Port,ReturnData,12]),
	    compare(ReturnData, ExpectedResult);
	{Port,{data,OtherData}} ->
	    io:format("~p returned WRONG data ~p", [Port,OtherData]),
	    ?line test_server:fail();
	Wrong ->
	    ?line test_server:fail({unexpected_port_or_data,Wrong})
    end.

compare(Got, Expected) ->
    case {list_to_binary([Got]),list_to_binary([Expected])} of
	{B,B} -> ok;
	{_Gb,_Eb} ->
	    ?t:fail(got_bad_data)
    end.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% 		Driver timer test suites
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


timer_measure(doc) -> ["Check that timers time out in good time."];
timer_measure(Config) when is_list(Config) ->
    ?line Dog = test_server:timetrap(test_server:minutes(1)),
    Name = 'timer_drv',
    ?line Port = start_driver(Config, Name, false),

    ?line try_timeouts(Port, 8997),

    ?line stop_driver(Port, Name),
    ?line test_server:timetrap_cancel(Dog),
    ok.

try_timeouts(_, 0) -> ok;
try_timeouts(Port, Timeout) ->
    ?line TimeBefore = now(),
    ?line erlang:port_command(Port, <<?START_TIMER,Timeout:32>>),
    receive
	{Port,{data,[?TIMER]}} ->
	    ?line Elapsed = erl_millisecs() - erl_millisecs(TimeBefore),
	    io:format("Elapsed: ~p Timeout: ~p\n", [Elapsed,Timeout]),
	    if
		Elapsed < Timeout ->
		    ?line ?t:fail(too_short);
		Elapsed > Timeout + ?delay ->
		    ?line ?t:fail(too_long);
		true ->
		    try_timeouts(Port, Timeout div 2)
	    end
    after Timeout + ?delay ->
	    ?line test_server:fail("driver failed to timeout")
    end.

timer_cancel(doc) -> ["Try cancelling timers set in a driver."];
timer_cancel(Config) when is_list(Config) ->
    ?line Dog = test_server:timetrap(test_server:minutes(1)),
    Name = 'timer_drv',
    ?line Port = start_driver(Config, Name, false),

    ?line try_cancel(Port, 10000),

    ?line stop_driver(Port, Name),
    ?line test_server:timetrap_cancel(Dog),
    ok.
    
try_cancel(Port, Timeout) ->
    ?line T_before = erl_millisecs(),
    Port ! {self(),{command,<<?START_TIMER,(Timeout + ?delay):32>>}},
    receive
	{Port, {data, [?TIMER]}} ->
	    ?line test_server:fail("driver timed out before cancelling it")
    after Timeout -> 
	    Port ! {self(), {command, [?CANCEL_TIMER]}},
	    receive 
		{Port, {data, [?TIMER]}} ->
		    ?line test_server:fail("driver timed out after cancelling it");
		{Port, {data, [?CANCELLED]}} ->
		    ?line Time_milli_secs = erl_millisecs() - T_before,

		    io:format("Time_milli_secs: ~p Timeout: ~p\n",
			      [Time_milli_secs, Timeout]), 
		    if
			Time_milli_secs > (Timeout + ?delay) ->
			    ?line test_server:fail("too long real time");
			Timeout == 0 -> ok;
			true -> try_cancel(Port, Timeout div 2)
		    end
	    after ?delay ->
		    test_server:fail("No message from driver")
	    end
    end.

%% Test that timers don't time out too early if we do a sleep
%% before setting a timer.

timer_delay(Config) when is_list(Config) ->
    ?line Dog = test_server:timetrap(test_server:minutes(1)),
    Name = 'timer_drv',
    ?line Port = start_driver(Config, Name, false),

    ?line TimeBefore = now(),
    Timeout0 = 350,
    ?line erlang:port_command(Port, <<?DELAY_START_TIMER,Timeout0:32>>),
    Timeout = Timeout0 +
	case os:type() of
	    {win32,_} -> 0;			%Driver doesn't sleep on Windows.
	    _ -> 1000
	end,
    receive
	{Port,{data,[?TIMER]}} ->
	    ?line Elapsed = erl_millisecs() - erl_millisecs(TimeBefore),
	    io:format("Elapsed time: ~p Timeout: ~p\n",
		      [Elapsed,Timeout]), 
	    if
		Elapsed < Timeout ->
		    ?line ?t:fail(too_short);
		Elapsed > Timeout + ?delay ->
		    ?line ?t:fail(too_long);
		true ->
		    ok
	    end
    end,

    ?line stop_driver(Port, Name),
    ?line test_server:timetrap_cancel(Dog),
    ok.

%% Test that driver_set_timer with new timout really changes
%% the timer (ticket OTP-5942), it didn't work before

timer_change(Config) when is_list(Config) ->
    ?line Dog = test_server:timetrap(test_server:minutes(1)),
    Name = 'timer_drv',
    ?line Port = start_driver(Config, Name, false),

    ?line try_change_timer(Port, 10000),

    ?line stop_driver(Port, Name),
    ?line test_server:timetrap_cancel(Dog),
    ok.
    
try_change_timer(_Port, 0) -> ok;
try_change_timer(Port, Timeout) ->
    ?line Timeout_3 = Timeout*3,
    ?line TimeBefore = now(),
    ?line erlang:port_command(Port, <<?START_TIMER,Timeout_3:32>>),
    ?line erlang:port_command(Port, <<?START_TIMER,Timeout:32>>),
    receive
	{Port,{data,[?TIMER]}} ->
	    ?line Elapsed = erl_millisecs() - erl_millisecs(TimeBefore),
	    io:format("Elapsed: ~p Timeout: ~p\n", [Elapsed,Timeout]),
	    if
		Elapsed < Timeout ->
		    ?line ?t:fail(too_short);
		Elapsed > Timeout + ?delay ->
		    ?line ?t:fail(too_long);
		true ->
		    try_timeouts(Port, Timeout div 2)
	    end
    after Timeout + ?delay ->
	    ?line test_server:fail("driver failed to timeout")
    end.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% 		Queue test suites
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

queue_echo(doc) ->
    ["1) Queue up data in a driver that uses the full driver_queue API to do this."
     "2) Get the data back, a random amount at a time."];
queue_echo(Config) when is_list(Config) ->
    case ?t:is_native(?MODULE) of
	true -> exit(crashes_native_code);
	false -> queue_echo_1(Config)
    end.

queue_echo_1(Config) ->
    ?line Dog = test_server:timetrap(test_server:minutes(10)),
    Name = 'queue_drv',
    ?line P = start_driver(Config, Name, true),

    ?line q_echo(P, [{?ENQ, {list,1}},
		     {?ENQ, {list,0}},
		     {?ENQ, {bin,0}},
		     {?ENQ, {bin,1}},
		     {?ENQ, {bin,2}},
		     {?ENQ, {bin,3}},
		     {?ENQ, {bin,4}},
		     {?ENQ, {bin,5}},
		     {?ENQ, {bin,600}},
		     {?PUSHQ, {list,0}},
		     {?PUSHQ, {list,1}},
		     {?PUSHQ, {bin,0}},
		     {?PUSHQ, {bin,1}},
		     {?PUSHQ, {bin,888}},
		     {?ENQ_BIN, {bin,0}},
		     {?ENQ_BIN, {bin,1}},
		     {?ENQ_BIN, {bin,2}},
		     {?ENQ_BIN, {bin,3}},
		     {?ENQ_BIN, {bin,4}},
		     {?ENQ_BIN, {bin,777}},
		     {?PUSHQ_BIN, {bin,0}},
		     {?PUSHQ_BIN, {bin,1}},
		     {?PUSHQ_BIN, {bin,334}},
		     {?ENQV, [{bin,0},{list,1},{bin,1},{bin,555}]},
		     {?ENQV, [{bin,0},{list,1},{bin,1}]},
		     {?PUSHQV, [{bin,0},{list,1},{bin,1},{bin,319}]}]),

    ?line stop_driver(P, Name),
    ?line test_server:timetrap_cancel(Dog),
    ok.

q_echo(Port, SpecList) ->
    io:format("Heap binaries"),
    HeapData = [{M,build_data(T)} || {M,T} <- SpecList],
    {HeapDataReturn,HeapDataLen} = feed_driver(Port, HeapData),
    dequeue(Port, HeapDataReturn, HeapDataLen, 1),

    %% Try sub binaries.
    io:format("Sub binaries of heap binaries"),
    SubHeapData = make_sub_binaries(HeapData),
    %% The following line will generate a warning.
    {HeapDataReturn,HeapDataLen} = feed_driver(Port, SubHeapData),
    dequeue(Port, HeapDataReturn, HeapDataLen, 1),

    %% Try refc binaries.
    io:format("Refc binaries"),
    RefcData = make_refc_binaries(HeapData),
    {RefcDataReturn,RefcDataLen} = feed_driver(Port, RefcData),
    dequeue(Port, RefcDataReturn, RefcDataLen, 1),

    %% Try sub binaries of refc binaries.
    io:format("Sub binaries of refc binaries"),
    SubRefcData = make_sub_binaries(RefcData),
    {RefcDataReturn,RefcDataLen} = feed_driver(Port, SubRefcData),
    dequeue(Port, RefcDataReturn, RefcDataLen, 1),

    %% Try a writable binary.
    io:format("Writable binaries"),
    WritableBinData = make_writable_binaries(HeapData),
    {WritableDataReturn,WritableDatalen} = feed_driver(Port, WritableBinData),
    _ = append_to_writable_binaries(WritableBinData),
    dequeue(Port, WritableDataReturn, WritableDatalen, 1),

    %% Try dequeing more than one byte at the time.
    io:format("Heap binaries -- dequeueing more than one byte at the time"),
    feed_and_dequeue(Port, HeapData, 2),
    feed_and_dequeue(Port, HeapData, 3),
    feed_and_dequeue(Port, HeapData, 4),
    
    io:format("\n").

feed_and_dequeue(Port, Data, DeqSize) ->
    {DataReturn,DataLen} = feed_driver(Port, Data),
    dequeue(Port, DataReturn, DataLen, DeqSize),
    ok.

%% Send all data according to the specification to the driver side (where it
%% is queued up for later return to this process).    

feed_driver(Port, Description) ->
    feed_driver(Port, Description, <<>>, 0).

feed_driver(Port, [], ExpectedInPort, Qb) ->
    io:format("Expected in port: ~P", [ExpectedInPort,12]),
    io:format("In port: ~P", [read_head(Port, Qb),12]),
    {ExpectedInPort,Qb};
feed_driver(Port, [{Method0,Data}|T], Expected_return, Qb_before) ->
    Method = case Method0 of
		 ?RANDOM -> uniform(6)-1;
		 Other -> Other
	     end,
    Size = size(list_to_binary([Data])),

    %% ***********************************************************************
    %% NOTE! Never never never change this to io:format/2, as that will imply
    %% message sending, and sending as message will spoil the test of
    %% writable binaries.

    %% erlang:display({sending,method_name(Method),Data}),
    %% ***********************************************************************

    queue_op(Port, Method, Data),

    Qb_in_driver = bytes_queued(Port),
    case Qb_before + Size of
	Qb_in_driver -> ok;
	Sum ->
	    io:format("Qb_before: ~p\n"
		      "Qb_before+Size: ~p\n"
		      "Qb_in_driver: ~p",
		      [Qb_before,Sum,Qb_in_driver]),
	    ?t:fail()
    end,
    X_return = case Method of
		   ?ENQ -> list_to_binary([Expected_return,Data]);
		   ?PUSHQ -> list_to_binary([Data,Expected_return]);
		   ?PUSHQ_BIN -> list_to_binary([Data,Expected_return]);
		   ?ENQ_BIN -> list_to_binary([Expected_return,Data]);
		   ?PUSHQV -> list_to_binary([Data,Expected_return]);
		   ?ENQV -> list_to_binary([Expected_return,Data])
	       end,
    feed_driver(Port, T, X_return, Qb_before + Size).

%% method_name(0) -> pushq;
%% method_name(1) -> enq;
%% method_name(2) -> pushq_bin;
%% method_name(3) -> enq_bin;
%% method_name(4) -> pushqv;
%% method_name(5) -> enqv.

dequeue(Port, DataList, LenToGet, DeqSize) ->
    io:format("Dequeuing ~p bytes, ~p byte(s) at once...", [LenToGet,DeqSize]),
    compare_return(Port, DataList, LenToGet, DeqSize).

compare_return(Port, _Data_list, 0, _Back_len) ->
    0 = bytes_queued(Port);
compare_return(Port, QueuedInPort0, Len_to_get, DeqSize) ->
    case bytes_queued(Port) of
	Len_to_get -> ok;
	BytesInQueue ->
	    io:format("Len_to_get: ~p", [Len_to_get]),
	    io:format("Bytes in queue: ~p", [BytesInQueue]),
	    ?line test_server:fail()
    end,
    BytesToDequeue = if (DeqSize > Len_to_get) -> Len_to_get;
			true -> DeqSize
		     end,
    Dequeued = read_head(Port, BytesToDequeue),
    case bin_prefix(Dequeued, QueuedInPort0) of
	true ->
	    deq(Port, BytesToDequeue),
	    <<_:BytesToDequeue/binary,QueuedInPort/binary>> = QueuedInPort0,
	    compare_return(Port, QueuedInPort, Len_to_get - BytesToDequeue, DeqSize);
	false ->
	    io:format("Bytes to dequeue: ~p", [BytesToDequeue]),
	    io:format("Dequeued: ~p", [Dequeued]),
	    io:format("Queued in port: ~P", [QueuedInPort0,12]),
	    ?t:fail()
    end.

%% bin_prefix(PrefixBinary, Binary)
%%  Is PrefixBinary a prefix of Binary?

bin_prefix(<<C:8,PreTail/binary>>, <<C:8,Tail/binary>>) ->
    bin_prefix(PreTail, Tail);
bin_prefix(<<>>, _Bin) -> true;
bin_prefix(_, _) -> false.

queue_op(Port, Method, Data) ->
    [] = erlang:port_control(Port, Method, []),
    Port ! {self(),{command,Data}},
    ok.

bytes_queued(Port) ->
    case erlang:port_control(Port, ?BYTES_QUEUED, []) of
	<<I:32>> -> I;
	Bad -> ?t:fail({bad_result,Bad})
    end.

deq(Port, Size) ->
    [] = erlang:port_control(Port, ?DEQ, <<Size:32>>).

read_head(Port, Size) ->
    erlang:port_control(Port, ?READ_HEAD, <<Size:32>>).


driver_unloaded(doc) ->
    [];
driver_unloaded(suite) ->
    [];
driver_unloaded(Config) when is_list(Config) ->
    ?line process_flag(trap_exit, true),
    ?line Drv = timer_drv,
    ?line User = self(),
    ?line Loaded = make_ref(),
    ?line Die = make_ref(),
    ?line Loader = spawn(fun () ->
				 erl_ddll:start(),
				 ok = load_driver(?config(data_dir,
								   Config),
							   Drv),
				 User ! Loaded,
				 receive Die -> exit(bye) end
			 end),
    ?line receive Loaded -> ok end,
    ?line Port = open_port({spawn, Drv}, []),
    ?line Loader ! Die,
    ?line receive
	      {'EXIT', Port, Reason} ->
		  ?line driver_unloaded = Reason
		  %% Reason used to be -1
	  end.
					 

io_ready_exit(doc) -> [];
io_ready_exit(suite) -> [];
io_ready_exit(Config) when is_list(Config) ->
    ?line OTE = process_flag(trap_exit, true),
    ?line Test = self(),
    ?line Dgawd = spawn(fun () ->
				ok = dgawd_handler:install(),
				Mon = erlang:monitor(process, Test),
				Test ! dgawd_handler_started,
				receive
				    {'DOWN', Mon, _, _, _} -> ok;
				    stop_dgawd_handler -> ok
				end,
				dgawd_handler:restore(),
				Test ! dgawd_handler_stopped
			end),
    ?line receive dgawd_handler_started -> ok end,
    ?line Drv = io_ready_exit_drv,
    ?line erl_ddll:start(),
    ?line ok = load_driver(?config(data_dir, Config), Drv),
    ?line Port = open_port({spawn, Drv}, []),
    ?line case erlang:port_control(Port, 0, "") of
	      "ok" ->
		  receive
		      {'EXIT', Port, Reason} ->
			  ?line case Reason of
				    ready_output_driver_failure ->
					?t:format("Exited in output_ready()~n"),
					?line ok;
				    ready_input_driver_failure ->
					?t:format("Exited in input_ready()~n"),
					?line ok;
				    Error -> ?line ?t:fail(Error)
				end
		  end,
		  receive after 2000 -> ok end,
		  ?line false = dgawd_handler:got_dgawd_report(),
		  ?line Dgawd ! stop_dgawd_handler,
		  ?line receive dgawd_handler_stopped -> ok end,
		  ?line process_flag(trap_exit, OTE),
		  ?line ok;
	      "nyiftos" ->
		  ?line process_flag(trap_exit, OTE),
		  ?line {skipped, "Not yet implemented for this OS"};
	      Error ->
		  ?line process_flag(trap_exit, OTE),
		  ?line ?t:fail({unexpected_control_result, Error})
	  end.
    

-define(CHKIO_STOP, 0).
-define(CHKIO_USE_FALLBACK_POLLSET, 1).
-define(CHKIO_BAD_FD_IN_POLLSET, 2).
-define(CHKIO_DRIVER_EVENT, 3).
-define(CHKIO_FD_CHANGE, 4).
-define(CHKIO_STEAL, 5).
-define(CHKIO_STEAL_AUX, 6).
-define(CHKIO_SMP_SELECT, 7).
-define(CHKIO_DRV_USE, 8).

use_fallback_pollset(doc) -> [];
use_fallback_pollset(suite) -> [];
use_fallback_pollset(Config) when is_list(Config) ->
    FlbkFun = fun () ->
		      ChkIoDuring = erlang:system_info(check_io),
		      case lists:keysearch(fallback_poll_set_size,
					   1,
					   ChkIoDuring) of
			  {value,
			   {fallback_poll_set_size, N}} when N > 0 ->
			      ?line ok;
			  Error ->
			      ?line ?t:fail({failed_to_use_fallback, Error})
		      end
	      end,
    ?line {BckupTest, Handel, OkRes}
	= case chkio_test_init(Config) of
	      {erts_poll_info, ChkIo} = Hndl ->
		  case lists:keysearch(fallback, 1, ChkIo) of
		      {value, {fallback, B}} when B =/= false ->
			  ?line {FlbkFun, Hndl, ok};
		      _ ->
			  ?line {fun () -> ok end,
				 Hndl,
				 {comment,
				  "This implementation does not use "
				  "a fallback pollset"}}
		  end;
	      Skip ->
		  {fun () -> ok end, Skip, ok}
	  end,
    ?line case chkio_test_fini(chkio_test(Handel,
					  ?CHKIO_USE_FALLBACK_POLLSET,
					  fun () ->
						  ?line sleep(1000),
						  ?line BckupTest()
					  end)) of
	      {skipped, _} = Res -> ?line Res;
	      _ -> ?line OkRes
	  end.

bad_fd_in_pollset(doc) -> [];
bad_fd_in_pollset(suite) -> [];
bad_fd_in_pollset(Config) when is_list(Config) ->
    ?line chkio_test_fini(chkio_test(chkio_test_init(Config),
				     ?CHKIO_BAD_FD_IN_POLLSET,
				     fun () -> ?line sleep(1000) end)).

driver_event(doc) -> [];
driver_event(suite) -> [];
driver_event(Config) when is_list(Config) ->
    ?line chkio_test_fini(chkio_test(chkio_test_init(Config),
				     ?CHKIO_DRIVER_EVENT,
				     fun () -> ?line sleep(1000) end)).

fd_change(doc) -> [];
fd_change(suite) -> [];
fd_change(Config) when is_list(Config) ->
    ?line chkio_test_fini(chkio_test(chkio_test_init(Config),
				     ?CHKIO_FD_CHANGE,
				     fun () -> ?line sleep(1000) end)).

steal_control(doc) -> [];
steal_control(suite) -> [];
steal_control(Config) when is_list(Config) ->
    ?line chkio_test_fini(case chkio_test_init(Config) of
			      {erts_poll_info, _} = Hndl ->
				  ?line steal_control_test(Hndl);
			      Skip ->
				  ?line Skip
			  end).

steal_control_test(Hndl = {erts_poll_info, Before}) ->
    ?line Port = open_chkio_port(),
    ?line case erlang:port_control(Port, ?CHKIO_STEAL_AUX, "") of
	      [$f,$d,$s,$:| _] = FdList ->
		  ?line chk_chkio_port(Port),
		  sleep(500),
		  ?line chk_chkio_port(Port),
		  ?line Res = chkio_test(Hndl,
					 ?CHKIO_STEAL,
					 FdList,
					 fun () ->
						 ?line chk_chkio_port(Port),
						 ?line sleep(500),
						 ?line chk_chkio_port(Port)
					 end),
		  ?line case erlang:port_control(Port, ?CHKIO_STOP, "") of
			    "ok" ->
				?line chk_chkio_port(Port),
				?line ok;
			    StopErr ->
				?line chk_chkio_port(Port),
				?line ?t:fail({stop_error, StopErr})
			end,
		  ?line close_chkio_port(Port),
		  ?line Res;
	      [$s,$k,$i,$p,$:,$\ |Skip] ->
		  ?line chk_chkio_port(Port),
		  ?line close_chkio_port(Port),
		  {chkio_test_result,
		   {skipped, Skip},
		   Before};
	      StartErr ->
		  ?line chk_chkio_port(Port),
		  ?line ?t:fail({start_error, StartErr})
	  end.

chkio_test_init(Config) when is_list(Config) ->
    ?line wait_until_no_pending_updates(),
    ?line ChkIo = erlang:system_info(check_io),
    ?line case catch lists:keysearch(name, 1, ChkIo) of
	      {value, {name, erts_poll}} ->
		  ?line ?t:format("Before test: ~p~n", [ChkIo]),
		  ?line Path = ?config(data_dir, Config),
		  ?line erl_ddll:start(),
		  ?line ok = load_driver(Path, 'chkio_drv'),
		  ?line process_flag(trap_exit, true),
		  ?line {erts_poll_info, ChkIo};
	      _ ->
		  ?line {skipped, "Test written to test erts_poll() which isn't used"}
	  end.
		  

chkio_test_fini({skipped, _} = Res) ->
    Res;
chkio_test_fini({chkio_test_result, Res, Before}) ->
    ?line ok = erl_ddll:unload_driver('chkio_drv'),
    ?line ok = erl_ddll:stop(),
    ?line wait_until_no_pending_updates(),
    ?line After = erlang:system_info(check_io),
    ?line ?t:format("After test: ~p~n", [After]),
    ?line verify_chkio_state(Before, After),
    ?line Res.

open_chkio_port() ->
    open_port({spawn, 'chkio_drv'}, []).

close_chkio_port(Port) when is_port(Port) ->
    true = erlang:port_close(Port),
    receive
	{'EXIT', Port, normal} ->
	    ok;
	{'EXIT', Port, Reason} ->
	    ?t:fail({abnormal_port_exit, Port, Reason});
	{Port, Message} ->
	    ?t:fail({strange_message_from_port, Message})
    end.

chk_chkio_port(Port) ->
    receive
	{'EXIT', Port, Reason} when Reason /= normal ->
	    ?t:fail({port_exited, Port, Reason})
    after 0 ->
	    ok
    end.
	    

chkio_test({skipped, _} = Res, _Test, _Fun) ->
    ?line Res;
chkio_test({erts_poll_info, _Before} = EPI, Test, Fun) when is_integer(Test) ->
    chkio_test(EPI, Test, "", Fun).

chkio_test({skipped, _} = Res, _Test, _TestArgs, _Fun) ->
    ?line Res;
chkio_test({erts_poll_info, Before},
	   Test,
	   TestArgs,
	   Fun) when is_integer(Test),
		     is_list(TestArgs) ->
    ?line Port = open_chkio_port(),
    ?line case erlang:port_control(Port, Test, TestArgs) of
	      "ok" ->
		  ?line chk_chkio_port(Port),
		  ?line Fun(),
		  ?line During = erlang:system_info(check_io),
		  ?line erlang:display(During),
		  ?line 0 = erts_debug:get_internal_state(check_io_debug),
		  ?line ?t:format("During test: ~p~n", [During]),
		  ?line chk_chkio_port(Port),
		  ?line case erlang:port_control(Port, ?CHKIO_STOP, "") of
			    Res when is_list(Res) ->
				?line chk_chkio_port(Port),
				?line ?t:format("~s", [Res]),
				?line close_chkio_port(Port),
				?line Res,
				?line case Res of
					  [$c,$o,$m,$m,$e,$n,$t,$:,$\ |Cmnt] ->
					      ?line {chkio_test_result,
						     {comment, Cmnt},
						     Before};
					  _ ->
					      ?line {chkio_test_result,
						     Res,
						     Before}
				      end;
			    StopErr ->
				?line chk_chkio_port(Port),
				?line ?t:fail({stop_error, StopErr})
			end;
	      [$s,$k,$i,$p,$:,$\ |Skip] ->
		  ?line chk_chkio_port(Port),
		  ?line close_chkio_port(Port),
		  {chkio_test_result,
		   {skipped, Skip},
		   Before};
	      StartErr ->
		  ?line chk_chkio_port(Port),
		  ?line ?t:fail({start_error, StartErr})
	  end.

verify_chkio_state(Before, After) ->
    ?line TotSetSize = lists:keysearch(total_poll_set_size, 1, Before),
    ?line TotSetSize = lists:keysearch(total_poll_set_size, 1, After),
    ?line case lists:keysearch(fallback, 1, Before) of
	      {value,{fallback,false}} ->
		  ?line ok;
	      _ ->
		  ?line BckupSetSize = lists:keysearch(fallback_poll_set_size,
						       1,
						       Before),
		  ?line BckupSetSize = lists:keysearch(fallback_poll_set_size,
						       1,
						       After)
	  end,
    ?line ok.
    
    

wait_until_no_pending_updates() ->
    case lists:keysearch(pending_updates, 1, erlang:system_info(check_io)) of
	{value, {pending_updates, 0}} ->
	    ok;
	false ->
	    ok;
	_ ->
	    receive after 10 -> ok end,
	    wait_until_no_pending_updates()
    end.

otp_6602(doc) -> ["Missed port lock when stealing control of fd from a "
		  "driver that didn't use the same lock. The lock checker "
		  "used to trigger on this and dump core."];
otp_6602(suite) ->
    [];
otp_6602(Config) when is_list(Config) ->
    ?line {ok, Node} = start_node(Config),
    ?line Done = make_ref(),
    ?line Parent = self(),
    ?line Tester = spawn_link(Node,
			      fun () ->
				      %% Inet driver use port locking...
				      {ok, S} = gen_udp:open(0),
				      {ok, Fd} = inet:getfd(S),
				      {ok, Port} = inet:port(S),
				      %% Steal fd (lock checker used to
				      %% trigger here).
				      {ok, _S2} = gen_udp:open(Port,[{fd,Fd}]),
				      Parent ! Done
			      end),
    ?line receive Done -> ok end,
    ?line unlink(Tester),
    ?line stop_node(Node),
    ?line ok.

-define(EXPECTED_SYSTEM_INFO_NAMES1,
	["drv_drv_vsn",
	 "emu_drv_vsn",
	 "erts_vsn",
	 "otp_vsn",
	 "thread",
	 "smp"]).
-define(EXPECTED_SYSTEM_INFO_NAMES2,
	(?EXPECTED_SYSTEM_INFO_NAMES1 ++
	 ["async_thrs",
	  "sched_thrs"])).

-define(EXPECTED_SYSTEM_INFO_NAMES, ?EXPECTED_SYSTEM_INFO_NAMES2).

'driver_system_info_ver1.0'(doc) ->    
    [];
'driver_system_info_ver1.0'(suite) ->
    [];
'driver_system_info_ver1.0'(Config) when is_list(Config) ->
    ?line driver_system_info_test(Config, sys_info_1_0_drv).

'driver_system_info_ver1.1'(doc) ->    
    [];
'driver_system_info_ver1.1'(suite) ->
    [];
'driver_system_info_ver1.1'(Config) when is_list(Config) ->
    ?line driver_system_info_test(Config, sys_info_1_1_drv).

driver_system_info_current_ver(doc) ->    
    [];
driver_system_info_current_ver(suite) ->
    [];
driver_system_info_current_ver(Config) when is_list(Config) ->
    ?line driver_system_info_test(Config, sys_info_curr_drv).

driver_system_info_test(Config, Name) ->
    ?line Port = start_driver(Config, Name, false),
    ?line case erlang:port_control(Port, 0, []) of
	      [$o,$k,$:,_ | Result] ->
		  ?line check_driver_system_info_result(Result);
	      [$e,$r,$r,$o,$r,$:,_ | Error] ->
		  ?line ?t:fail(Error);
	      Unexpected ->
		  ?line ?t:fail({unexpected_result, Unexpected})
	  end,
    ?line stop_driver(Port, Name),
    ?line ok.

check_driver_system_info_result(Result) ->
    ?line ?t:format("All names: ~p~n", [?EXPECTED_SYSTEM_INFO_NAMES]),
    ?line ?t:format("Result: ~p~n", [Result]),
    ?line {[], Ns, DDVSN} = chk_sis(lists:map(fun (Str) ->
						      string:tokens(Str, "=")
					      end,
					      string:tokens(Result, " ")),
				    ?EXPECTED_SYSTEM_INFO_NAMES),
    ?line case {DDVSN,
		drv_vsn_str2tup(erlang:system_info(driver_version))} of
	      {DDVSN, DDVSN} ->
		  ?line [] = Ns;
	      {{1, 0}, _} ->
		  ?line ExpNs = lists:sort(?EXPECTED_SYSTEM_INFO_NAMES
					   -- ?EXPECTED_SYSTEM_INFO_NAMES1),
		  ?line ExpNs = lists:sort(Ns);
	      {{1, 1}, _} ->
		  ?line ExpNs = lists:sort(?EXPECTED_SYSTEM_INFO_NAMES
					   -- ?EXPECTED_SYSTEM_INFO_NAMES2),
		  ?line ExpNs = lists:sort(Ns)
	  end.

chk_sis(SIs, Ns) ->
    chk_sis(SIs, Ns, unknown).

chk_sis(SIs, [], DDVSN) ->
    ?line {SIs, [], DDVSN};
chk_sis([], Ns, DDVSN) ->
    ?line {[], Ns, DDVSN};
chk_sis([[N, _] = SI| SIs], Ns, DDVSN) ->
    ?line true = lists:member(N, Ns),
    ?line case check_si_res(SI) of
	      {driver_version, NewDDVSN} ->
		  ?line chk_sis(SIs, lists:delete(N, Ns), NewDDVSN);
	      _ ->
		  ?line chk_sis(SIs, lists:delete(N, Ns), DDVSN)
	  end.

%% Data in first version of driver_system_info() (driver version 1.0)
check_si_res(["drv_drv_vsn", Value]) ->
    ?line DDVSN = drv_vsn_str2tup(Value),
    ?line {Major, DMinor} = DDVSN,
    ?line {Major, EMinor} = drv_vsn_str2tup(erlang:system_info(driver_version)),
    ?line true = DMinor =< EMinor,
    ?line {driver_version, DDVSN};
check_si_res(["emu_drv_vsn", Value]) ->
    ?line Value = erlang:system_info(driver_version);
check_si_res(["erts_vsn", Value]) ->
    ?line Value = erlang:system_info(version);
check_si_res(["otp_vsn", Value]) ->
    ?line Value = erlang:system_info(otp_release);
check_si_res(["thread", "true"]) ->
    ?line true = erlang:system_info(threads);
check_si_res(["thread", "false"]) ->
    ?line false = erlang:system_info(threads);
check_si_res(["smp", "true"]) ->
    ?line true = erlang:system_info(smp_support);
check_si_res(["smp", "false"]) ->
    ?line false = erlang:system_info(smp_support);

%% Data added in second version of driver_system_info() (driver version 1.1)
check_si_res(["async_thrs", Value]) ->
    ?line Value = integer_to_list(erlang:system_info(thread_pool_size));
check_si_res(["sched_thrs", Value]) ->
    ?line Value = integer_to_list(erlang:system_info(schedulers));

check_si_res(Unexpected) ->
    ?line ?t:fail({unexpected_result, Unexpected}).

-define(MON_OP_I_AM_IPID,1).
-define(MON_OP_MONITOR_ME,2).
-define(MON_OP_DEMONITOR_ME,3).
-define(MON_OP_MONITOR_ME_LATER,4).
-define(MON_OP_DO_DELAYED_MONITOR,5).

driver_monitor(suite) ->
    [];
driver_monitor(doc) ->    
    ["Test monitoring of processes from drivers"];
driver_monitor(Config) when is_list(Config) ->
    ?line Name = monitor_drv,
    ?line Port = start_driver(Config, Name, false),
    ?line "ok" = port_control(Port,?MON_OP_I_AM_IPID,[]),
    ?line "ok" = port_control(Port,?MON_OP_MONITOR_ME,[]),
    ?line "ok" = port_control(Port,?MON_OP_DEMONITOR_ME,[]),
    ?line {monitors, []} = erlang:port_info(Port,monitors),
    
    ?line "ok:"++Id1 = port_control(Port,?MON_OP_MONITOR_ME_LATER,[]),
    ?line {monitored_by, []} = process_info(self(),monitored_by),
    ?line "ok" = port_control(Port,?MON_OP_DO_DELAYED_MONITOR,Id1),
    ?line {monitored_by, [Port]} = process_info(self(),monitored_by),
    ?line "ok" = port_control(Port,?MON_OP_DEMONITOR_ME,[]),
    ?line {monitored_by, []} = process_info(self(),monitored_by),
    
    ?line "ok" = port_control(Port,?MON_OP_MONITOR_ME,[]),
    ?line Me = self(),
    ?line {Pid1,Ref1} =
	spawn_monitor(fun() ->
			      Me ! port_control(Port,?MON_OP_MONITOR_ME,[]), 
			      Me ! process_info(self(),monitored_by), 
			      Me ! erlang:port_info(Port,monitors) 
		      end),
    ?line ok = receive
		   "ok" ->
		       ok
	       after 1000 ->
		       timeout
	       end,
    ?line ok = receive
		   {monitored_by, L} ->
		       L2 = lists:sort(L),
		       L3 = lists:sort([Me,Port]),
		       case L2 of
			   L3 ->
			       ok;
			   _ ->
			       mismatch
		       end
	       after 1000 ->
		       timeout
	       end,
    ?line ok = receive
		   {monitors, LL} ->
		       LL2 = lists:sort(LL),
		       LL3 = lists:sort([{process,Me},{process,Pid1}]),
		       case LL2 of
			   LL3 ->
			       ok;
			   _ ->
			       mismatch
		       end
	       after 1000 ->
		       timeout
	       end,
    ?line ok = receive
		   {'DOWN', Ref1, process, Pid1, _} ->
		       ok
	       after 1000 ->
		       timeout
	       end,
    ?line ok = receive
		   {monitor_fired,Port,Pid1} ->
		       ok
	       after 1000 ->
		       timeout
	       end,
    ?line "ok" = port_control(Port,?MON_OP_DEMONITOR_ME,[]),
    ?line {monitors,[]} = erlang:port_info(Port,monitors),
    ?line {monitored_by, []} = process_info(self(),monitored_by),

    ?line "ok" = port_control(Port,?MON_OP_MONITOR_ME,[]),
    ?line {Pid2,Ref2} =
	spawn_monitor(fun() -> 			       
			      receive go -> ok end,
			      Me ! port_control(Port,?MON_OP_MONITOR_ME_LATER,[]), 
			      Me ! process_info(self(),monitored_by), 
			      Me ! erlang:port_info(Port,monitors) 
		      end),
    ?line Pid2 ! go,
    ?line {ok,Id2} = receive
		   "ok:"++II ->
		       {ok,II}
	       after 1000 ->
		       timeout
	       end,
    ?line ok = receive
		   {monitored_by, [Me]} ->
		       ok
	       after 1000 ->
		       timeout
	       end,
    ?line ok = receive
		   {monitors, [{process,Me}]} ->
		       ok
	       after 1000 ->
		       timeout
	       end,
    ?line ok = receive
		   {'DOWN', Ref2, process, Pid2, _} ->
		       ok
	       after 1000 ->
		       timeout
	       end,
    ?line "noproc" = port_control(Port,?MON_OP_DO_DELAYED_MONITOR,Id2),
    ?line {monitors,[{process,Me}]} = erlang:port_info(Port,monitors),
    ?line "ok" = port_control(Port,?MON_OP_DEMONITOR_ME,[]),
    ?line "not_monitored" = port_control(Port,?MON_OP_DEMONITOR_ME,[]),
    ?line {monitors,[]} = erlang:port_info(Port,monitors),
    ?line {monitored_by, []} = process_info(self(),monitored_by),


    ?line "ok" = port_control(Port,?MON_OP_MONITOR_ME,[]),
    ?line {Pid3,Ref3} =
	spawn_monitor(fun() ->
			      receive go -> ok end,
			      Me ! port_control(Port,?MON_OP_MONITOR_ME_LATER,[]), 
			      Me ! process_info(self(),monitored_by), 
			      Me ! erlang:port_info(Port,monitors) ,
			      receive die -> ok end
		      end),
    ?line Pid3 ! go,
    ?line {ok,Id3} = receive
		   "ok:"++III ->
		       {ok,III}
	       after 1000 ->
		       timeout
	       end,
    ?line ok = receive
		   {monitored_by, [Me]} ->
		       ok
	       after 1000 ->
		       timeout
	       end,
    ?line ok = receive
		   {monitors, [{process,Me}]} ->
		       ok
	       after 1000 ->
		       timeout
	       end,
    ?line "ok" = port_control(Port,?MON_OP_DO_DELAYED_MONITOR,Id3),
    ?line LLL1 = lists:sort([{process,Me},{process,Pid3}]),
    ?line {monitors,LLL2} = erlang:port_info(Port,monitors),
    ?line LLL1 = lists:sort(LLL2),
    ?line "ok" = port_control(Port,?MON_OP_DEMONITOR_ME,[]),
    ?line {monitors,[{process,Pid3}]} = erlang:port_info(Port,monitors),
    ?line Pid3 ! die,
    ?line ok = receive
		   {'DOWN', Ref3, process, Pid3, _} ->
		       ok
	       after 1000 ->
		       timeout
	       end,
    ?line "not_found" = port_control(Port,?MON_OP_DO_DELAYED_MONITOR,Id2),
    ?line {monitors,[]} = erlang:port_info(Port,monitors),
    ?line "not_monitored" = port_control(Port,?MON_OP_DEMONITOR_ME,[]),
    ?line {monitors,[]} = erlang:port_info(Port,monitors),
    ?line {monitored_by, []} = process_info(self(),monitored_by),
    
    ?line stop_driver(Port, Name),
    ?line ok.


-define(IOQ_EXIT_READY_INPUT, 1).
-define(IOQ_EXIT_READY_OUTPUT, 2).
-define(IOQ_EXIT_TIMEOUT, 3).
-define(IOQ_EXIT_READY_ASYNC, 4).
-define(IOQ_EXIT_EVENT, 5).
-define(IOQ_EXIT_READY_INPUT_ASYNC, 6).
-define(IOQ_EXIT_READY_OUTPUT_ASYNC, 7).
-define(IOQ_EXIT_TIMEOUT_ASYNC, 8).
-define(IOQ_EXIT_EVENT_ASYNC, 9).

ioq_exit_test(Config, TestNo) ->
    ?line Drv = ioq_exit_drv,
    ?line try
	      begin
		  ?line case load_driver(?config(data_dir, Config),
						  Drv) of
			    ok -> ?line ok;
			    {error, permanent} -> ?line ok;
			    LoadError -> ?line ?t:fail({load_error, LoadError})
			end,
		  case open_port({spawn, Drv}, []) of
		      Port when is_port(Port) ->
			      try port_control(Port, TestNo, "") of
				  "ok" ->
				      ?line ok;
				  "nyiftos" ->
				      ?line throw({skipped,
						   "Not yet implemented for "
						   "this OS"});
				  [$s,$k,$i,$p,$:,$ | Comment] ->
				      ?line throw({skipped, Comment});
				  [$e,$r,$r,$o,$r,$:,$ | Error] ->
				      ?line ?t:fail(Error)
			      after
				  Port ! {self(), close},
				receive {Port, closed} -> ok end,
				false = lists:member(Port, erlang:ports()),
				ok
			      end;
		      Error ->
			  ?line ?t:fail({open_port_failed, Error})
		  end
	      end
	  catch
	      throw:Term -> ?line Term
	  after
	      erl_ddll:unload_driver(Drv)
	  end.

ioq_exit_ready_input(doc) -> [];
ioq_exit_ready_input(suite) -> [];
ioq_exit_ready_input(Config) when is_list(Config) ->
    ioq_exit_test(Config, ?IOQ_EXIT_READY_INPUT).

ioq_exit_ready_output(doc) -> [];
ioq_exit_ready_output(suite) -> [];
ioq_exit_ready_output(Config) when is_list(Config) ->
    ioq_exit_test(Config, ?IOQ_EXIT_READY_OUTPUT).

ioq_exit_timeout(doc) -> [];
ioq_exit_timeout(suite) -> [];
ioq_exit_timeout(Config) when is_list(Config) ->
    ioq_exit_test(Config, ?IOQ_EXIT_TIMEOUT).

ioq_exit_ready_async(doc) -> [];
ioq_exit_ready_async(suite) -> [];
ioq_exit_ready_async(Config) when is_list(Config) ->
    ioq_exit_test(Config, ?IOQ_EXIT_READY_ASYNC).

ioq_exit_event(doc) -> [];
ioq_exit_event(suite) -> [];
ioq_exit_event(Config) when is_list(Config) ->
    ioq_exit_test(Config, ?IOQ_EXIT_EVENT).

ioq_exit_ready_input_async(doc) -> [];
ioq_exit_ready_input_async(suite) -> [];
ioq_exit_ready_input_async(Config) when is_list(Config) ->
    ioq_exit_test(Config, ?IOQ_EXIT_READY_INPUT_ASYNC).

ioq_exit_ready_output_async(doc) -> [];
ioq_exit_ready_output_async(suite) -> [];
ioq_exit_ready_output_async(Config) when is_list(Config) ->
    ioq_exit_test(Config, ?IOQ_EXIT_READY_OUTPUT_ASYNC).

ioq_exit_timeout_async(doc) -> [];
ioq_exit_timeout_async(suite) -> [];
ioq_exit_timeout_async(Config) when is_list(Config) ->
    ioq_exit_test(Config, ?IOQ_EXIT_TIMEOUT_ASYNC).

ioq_exit_event_async(doc) -> [];
ioq_exit_event_async(suite) -> [];
ioq_exit_event_async(Config) when is_list(Config) ->
    ioq_exit_test(Config, ?IOQ_EXIT_EVENT_ASYNC).


vsn_mismatch_test(Config, LoadResult) ->
    ?line Path = ?config(data_dir, Config),
    ?line DrvName = ?config(testcase, Config),
    ?line LoadResult = load_driver(Path, DrvName),
    ?line case LoadResult of
	      ok ->
		  ?line Port = open_port({spawn, DrvName}, []),
		  ?line true = is_port(Port),
		  ?line true = port_close(Port),
		  ?line ok = erl_ddll:unload_driver(DrvName);
	      _ ->
		  ?line ok
	  end.

zero_extended_marker_garb_drv(doc) -> [];
zero_extended_marker_garb_drv(suite) -> [];
zero_extended_marker_garb_drv(Config) when is_list(Config) ->
    vsn_mismatch_test(Config, {error, driver_incorrect_version}).

invalid_extended_marker_drv(doc) -> [];
invalid_extended_marker_drv(suite) -> [];
invalid_extended_marker_drv(Config) when is_list(Config) ->
    vsn_mismatch_test(Config, {error, driver_incorrect_version}).

larger_major_vsn_drv(doc) -> [];
larger_major_vsn_drv(suite) -> [];
larger_major_vsn_drv(Config) when is_list(Config) ->
    vsn_mismatch_test(Config, {error, driver_incorrect_version}).

larger_minor_vsn_drv(doc) -> [];
larger_minor_vsn_drv(suite) -> [];
larger_minor_vsn_drv(Config) when is_list(Config) ->
    vsn_mismatch_test(Config, {error, driver_incorrect_version}).

smaller_major_vsn_drv(doc) -> [];
smaller_major_vsn_drv(suite) -> [];
smaller_major_vsn_drv(Config) when is_list(Config) ->
    vsn_mismatch_test(Config, {error, driver_incorrect_version}).

smaller_minor_vsn_drv(doc) -> [];
smaller_minor_vsn_drv(suite) -> [];
smaller_minor_vsn_drv(Config) when is_list(Config) ->
    DrvVsnStr = erlang:system_info(driver_version),
    case drv_vsn_str2tup(DrvVsnStr) of
	{_, 0} ->
	    {skipped,
	     "Cannot perform test when minor driver version is 0. "
	     "Current driver version is " ++ DrvVsnStr ++ "."};
	_ ->
	    vsn_mismatch_test(Config, ok)
    end.

-define(PEEK_NONXQ_TEST, 0).
-define(PEEK_NONXQ_WAIT, 1).

peek_non_existing_queue(doc) -> [];
peek_non_existing_queue(suite) -> [];
peek_non_existing_queue(Config) when is_list(Config) ->
    ?line OTE = process_flag(trap_exit, true),
    ?line Drv = peek_non_existing_queue_drv,
    ?line try
	      begin
		  ?line case load_driver(?config(data_dir, Config),
						  Drv) of
			    ok -> ?line ok;
			    {error, permanent} -> ?line ok;
			    LoadError -> ?line ?t:fail({load_error, LoadError})
			end,
		  case open_port({spawn, Drv}, []) of
		      Port1 when is_port(Port1) ->
			  try port_control(Port1, ?PEEK_NONXQ_TEST, "") of
			      "ok" ->
				  ?line ok;
			      [$s,$k,$i,$p,$p,$e,$d,$:,$ | SkipReason] ->
				  ?line throw({skipped, SkipReason});
			      [$e,$r,$r,$o,$r,$:,$ | Error1] ->
				  ?line ?t:fail(Error1)
			  after
			      exit(Port1, kill),
			    receive {'EXIT', Port1, _} -> ok end
			  end;
		      Error1 ->
			  ?line ?t:fail({open_port1_failed, Error1})
		  end,
		  case open_port({spawn, Drv}, []) of
		      Port2 when is_port(Port2) ->
			  try port_control(Port2, ?PEEK_NONXQ_WAIT, "") of
			      "ok" ->
				  ?line ok;
			      [$e,$r,$r,$o,$r,$:,$ | Error2] ->
				  ?line ?t:fail(Error2)
			  after
			      receive {Port2, test_successful} -> ok end,
			    Port2 ! {self(), close},
			    receive {Port2, closed} -> ok end
			  end;
		      Error2 ->
			  ?line ?t:fail({open_port2_failed, Error2})
		  end
	      end
	  catch
	      throw:Term -> ?line Term
	  after
	      process_flag(trap_exit, OTE),
	      erl_ddll:unload_driver(Drv)
	  end.    

otp_6879(doc) ->
    [];
otp_6879(suite) ->
    [];
otp_6879(Config) when is_list(Config) ->
    ?line Drv = 'otp_6879_drv',
    ?line Parent = self(),
    ?line ok = load_driver(?config(data_dir, Config), Drv),
    ?line Procs = lists:map(
		    fun (No) ->
			    spawn_link(
			      fun () ->
				      case open_port({spawn, Drv}, []) of
					  Port when is_port(Port) ->
					      Res = otp_6879_call(Port, No, 10000),
					      erlang:port_close(Port),
					      Parent ! {self(), Res};
					  _ ->
					      Parent ! {self(),
							open_port_failed}
				      end
			      end)
		    end,
		    lists:seq(1,10)),
    ?line lists:foreach(fun (P) ->
				?line receive
					  {P, ok} ->
					      ?line ok;
					  {P, Error} ->
					      ?line ?t:fail({P, Error})
				      end
			end,
			Procs),
    %% Also try it when input exeeds default buffer (256 bytes)
    ?line Data = lists:seq(1, 1000),
    ?line case open_port({spawn, Drv}, []) of
	      Port when is_port(Port) ->
		  ?line ok = otp_6879_call(Port, Data, 10),
		  ?line erlang:port_close(Port);
	      _ ->
		  ?line ?t:fail(open_port_failed)
	  end,
    ?line erl_ddll:unload_driver(Drv),
    ?line ok.

otp_6879_call(_Port, _Data, 0) ->
    ok;
otp_6879_call(Port, Data, N) ->
    case catch erlang:port_call(Port, 0, Data) of
	Data -> otp_6879_call(Port, Data, N-1);
	BadData -> {mismatch, Data, BadData}
    end.

caller(doc) ->
    [];
caller(suite) ->
    [];
caller(Config) when is_list(Config) ->
    ?line run_caller_test(Config, false),
    ?line run_caller_test(Config, true).
    
run_caller_test(Config, Outputv) ->
    ?line Drv = 'caller_drv',
    ?line Cmd = case Outputv of
		    true ->
			?line os:putenv("CALLER_DRV_USE_OUTPUTV",
					"true"),
			outputv;
		    false ->
			?line os:putenv("CALLER_DRV_USE_OUTPUTV",
					"false"),
			output
		end,
    ?line ok = load_driver(?config(data_dir, Config), Drv),
    ?line Port = open_port({spawn, Drv}, []),
    ?line true = is_port(Port),
    ?line chk_caller(Port, start, self()),
    ?line chk_caller(Port,
		     Cmd,
		     spawn_link(
		       fun () ->
			       port_command(Port, "")
		       end)),
    ?line Port ! {self(), {command, ""}},
    ?line chk_caller(Port, Cmd, self()),
    ?line chk_caller(Port,
		     control,
		     spawn_link(
		       fun () ->
			       port_control(Port, 0, "")
		       end)),
    ?line chk_caller(Port,
		     call,
		     spawn_link(
		       fun () ->
			       erlang:port_call(Port, 0, "")
		       end)),
    ?line true = port_close(Port),
    ?line erl_ddll:unload_driver(Drv),
    ?line ok.

chk_caller(Port, Callback, ExpectedCaller) ->
    receive
	{caller, Port, Callback, Caller} ->
	    ExpectedCaller = Caller
    end.

many_events(suite) ->
    [];
many_events(doc) ->
    ["Check that many simultaneously signalled events work (win32)"];
many_events(Config) when is_list(Config) ->
    ?line Name = 'many_events_drv',
    ?line Port = start_driver(Config, Name, false),
    Number = "1000",
    Port ! {self(), {command, Number}},
    receive 
	{Port, {data,Number}} ->
	    ?line receive %% Just to make sure the emulator does not crash 
		    %% after this case is run (if faulty)
		      after 2000 ->
			      ok
		      end
    after 1000 ->
	    ?line exit(the_driver_does_not_respond)
    end,
    ?line stop_driver(Port, Name),
    ?line ok.
	     

missing_callbacks(doc) ->
    [];
missing_callbacks(suite) ->
    [];
missing_callbacks(Config) when is_list(Config) ->
    ?line Name = 'missing_callback_drv',
    ?line Port = start_driver(Config, Name, false),

    ?line Port ! {self(), {command, "tjenix"}},
    ?line true = erlang:port_command(Port, "halloj"),
    ?line {'EXIT', {badarg, _}} = (catch erlang:port_control(Port, 4711, "mors")),
    ?line {'EXIT', {badarg, _}} = (catch erlang:port_call(Port, 17, "hej")),

    ?line %% Give the (non-existing) ready_output(), ready_input(), event(),
    ?line %% and timeout() some time to be called.
    ?line receive after 1000 -> ok end,

    ?line stop_driver(Port, Name),
    ?line ok.

smp_select(doc) ->
    ["Test concurrent calls to driver_select."];
smp_select(suite) ->
    [];
smp_select(Config) when is_list(Config) -> 
    case os:type() of
	{win32,_} -> {skipped, "Test not implemented for this OS"};
	_ -> smp_select0(Config)
    end.
    
smp_select0(Config) ->
    ?line DrvName = 'chkio_drv',
    Path = ?config(data_dir, Config),
    erl_ddll:start(),
    ?line ok = load_driver(Path, DrvName),    
    Master = self(),
    ProcFun = fun()-> io:format("Worker ~p starting\n",[self()]),	
		      ?line Port = open_port({spawn, DrvName}, []),
		      smp_select_loop(Port, 100000),
		      sleep(1000), % wait for driver to handle pending events
		      ?line true = erlang:port_close(Port),
		      Master ! {ok,self()},
		      io:format("Worker ~p finished\n",[self()])
	     end,
    ?line Pids = lists:map(fun(_) -> spawn_link(ProcFun) end,
			   lists:seq(1,4)),
    TimeoutMsg = make_ref(),
    {ok,TRef} = timer:send_after(5*1000, TimeoutMsg), % Limit test duration on slow machines
    smp_select_wait(Pids, TimeoutMsg),
    timer:cancel(TRef),
    ?line ok = erl_ddll:unload_driver(DrvName),
    ?line ok = erl_ddll:stop(),
    ok.

smp_select_loop(_, 0) ->
    ok;
smp_select_loop(Port, N) ->
    ?line "ok" = erlang:port_control(Port, ?CHKIO_SMP_SELECT, []),
    receive
	stop -> 
	    io:format("Worker ~p stopped with ~p laps left\n",[self(), N]), 
	    ok
    after 0 ->
	smp_select_loop(Port, N-1)
    end.

smp_select_wait([], _) ->
    ok;
smp_select_wait(Pids, TimeoutMsg) ->
    receive
	{ok,Pid} when is_pid(Pid) ->
	    smp_select_wait(lists:delete(Pid,Pids), TimeoutMsg);
	TimeoutMsg ->
	    lists:foreach(fun(Pid)-> Pid ! stop end,
			  Pids),
	    smp_select_wait(Pids, TimeoutMsg)
    end.


driver_select_use(doc) ->
    ["Test driver_select() with new ERL_DRV_USE flag."];
driver_select_use(suite) ->
    [];
driver_select_use(Config) when is_list(Config) -> 
    case os:type() of
	{win32,_} -> {skipped, "Test not implemented for this OS"};
	_ -> driver_select_use0(Config)
    end.
    
driver_select_use0(Config) ->
    ?line DrvName = 'chkio_drv',
    Path = ?config(data_dir, Config),
    erl_ddll:start(),
    ?line ok = load_driver(Path, DrvName),    
    ?line Port = open_port({spawn, DrvName}, []),
    ?line "ok" = erlang:port_control(Port, ?CHKIO_DRV_USE, []),
    ?line {Port,{data,"TheEnd"}} = receive Msg -> Msg
				   after 10000 -> timeout end,
    ?line true = erlang:port_close(Port),
    ?line ok = erl_ddll:unload_driver(DrvName),
    ?line ok = erl_ddll:stop(),
    ok.

thread_mseg_alloc_cache_clean(Config) when is_list(Config) ->
    case {erlang:system_info(threads),
	  erlang:system_info({allocator,mseg_alloc}),
	  driver_alloc_sbct()} of
	{_, false, _} ->
	    ?line {skipped, "No mseg_alloc"};
	{false, _, _} ->
	    ?line {skipped, "No threads"};
	{_, _, false} ->
	    ?line {skipped, "driver_alloc() not using the alloc_util framework"};
	{_, _, SBCT} when is_integer(SBCT), SBCT > 10*1024*1024 ->
	    ?line {skipped, "driver_alloc() using too large single block threshold"};
	{_, _, 0} ->
	    ?line {skipped, "driver_alloc() using too low single block threshold"};
	{true, MsegAllocInfo, SBCT} ->
	    ?line DrvName = 'thr_alloc_drv',
	    ?line Path = ?config(data_dir, Config),
	    ?line erl_ddll:start(),
	    ?line ok = load_driver(Path, DrvName),   
	    ?line Port = open_port({spawn, DrvName}, []),
	    ?line CCI = mseg_alloc_cci(MsegAllocInfo),
	    ?line ?t:format("CCI = ~p~n", [CCI]),
	    ?line CCC = mseg_alloc_ccc(),
	    ?line ?t:format("CCC = ~p~n", [CCC]),
	    ?line thread_mseg_alloc_cache_clean_test(Port,
						     10,
						     CCI,
						     SBCT+100),
	    ?line true = erlang:port_close(Port),
	    ?line ok = erl_ddll:unload_driver(DrvName),
	    ?line ok = erl_ddll:stop(),
	    ?line ok
    end.

mseg_alloc_cci(MsegAllocInfo) ->
    ?line {value,{options, OL}}
	= lists:keysearch(options, 1, MsegAllocInfo),
    ?line {value,{cci,CCI}} = lists:keysearch(cci,1,OL),
    ?line CCI.

mseg_alloc_ccc() ->
    mseg_alloc_ccc(erlang:system_info({allocator,mseg_alloc})).

mseg_alloc_ccc(MsegAllocInfo) ->
    ?line {value,{memkind, MKL}} = lists:keysearch(memkind,1,MsegAllocInfo),
    ?line {value,{calls, CL}} = lists:keysearch(calls, 1, MKL),
    ?line {value,{mseg_check_cache, GigaCCC, CCC}}
	= lists:keysearch(mseg_check_cache, 1, CL),
    ?line GigaCCC*1000000000 + CCC.

mseg_alloc_cached_segments() ->
    mseg_alloc_cached_segments(erlang:system_info({allocator,mseg_alloc})).

mseg_alloc_cached_segments(MsegAllocInfo) ->
    MemName = case is_halfword_vm() of
	true -> "high memory";
	false -> "all memory"
    end,
    ?line [{memkind,DrvMem}]
	= lists:filter(fun(E) -> case E of
				    {memkind, [{name, MemName} | _]} -> true;
				    _ -> false
		       end end, MsegAllocInfo),
    ?line {value,{status, SL}}
	= lists:keysearch(status, 1, DrvMem),
    ?line {value,{cached_segments, CS}}
	= lists:keysearch(cached_segments, 1, SL),
    ?line CS.

is_halfword_vm() ->
    case {erlang:system_info({wordsize, internal}),
	  erlang:system_info({wordsize, external})} of
	{4, 8} -> true;
	{WS, WS} -> false
    end.

driver_alloc_sbct() ->
    {_, _, _, As} = erlang:system_info(allocator),
    case lists:keysearch(driver_alloc, 1, As) of
	{value,{driver_alloc,DAOPTs}} ->
	    case lists:keysearch(sbct, 1, DAOPTs) of
		{value,{sbct,SBCT}} ->
		    SBCT;
		_ ->
		    false
	    end;
	_ ->
	    false
    end.

thread_mseg_alloc_cache_clean_test(_Port, 0, _CCI, _Size) ->
    ?line ok;
thread_mseg_alloc_cache_clean_test(Port, N, CCI, Size) ->
    ?line wait_until(fun () -> 0 == mseg_alloc_cached_segments() end),
    ?line receive after CCI+500 -> ok end,
    ?line OCCC = mseg_alloc_ccc(),
    ?line "ok" = erlang:port_control(Port, 0, integer_to_list(Size)),
    ?line receive after CCI+500 -> ok end,
    ?line CCC = mseg_alloc_ccc(),
    ?line ?t:format("CCC = ~p~n", [CCC]),
    ?line true = CCC > OCCC,
    ?line thread_mseg_alloc_cache_clean_test(Port, N-1, CCI, Size).
    
    

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% 		Utilities
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    

wait_until(Fun) ->
    case Fun() of
	true -> ok;
	false ->
	    receive after 100 -> ok end,
	    wait_until(Fun)
    end.

drv_vsn_str2tup(Str) ->
    [Major, Minor] = string:tokens(Str, "."),
    {list_to_integer(Major), list_to_integer(Minor)}.

%% Build port data from a template.

build_data({bin,Size})  -> build_binary(Size);
build_data({list,Size}) -> build_list(Size);
build_data(int) -> random_char();
build_data([])  -> [];
build_data([H|T]) -> [build_data(H)|build_data(T)].

%% Transform all binaries in a term.

transform_bins(_Transform, []) -> [];
transform_bins(Transform, [H|T]) ->
    [transform_bins(Transform, H)|transform_bins(Transform, T)];
transform_bins(Transform, Tuple) when is_tuple(Tuple) ->
    list_to_tuple([transform_bins(Transform, E) || E <- tuple_to_list(Tuple)]);
transform_bins(Transform, Bin) when is_binary(Bin) ->
    Transform(Bin);
transform_bins(_Transform, Other) -> Other.


%% Convert all binaries in a term to sub binaries.

make_sub_binaries(Term) ->
    MakeSub = fun(Bin0) ->
		      Bin1 = <<243:8,0:3,Bin0/binary,31:5,19:8>>,
		      Sz = size(Bin0),
		      <<243:8,0:3,Bin:Sz/binary,31:5,19:8>> = id(Bin1),
		      Bin
	      end,
    transform_bins(MakeSub, Term).

id(I) -> I.

%% Convert all binaries in a term to refc binaries.

make_refc_binaries(Term) ->
    F = fun(B0) -> list_to_binary([build_binary(?heap_binary_size+1),B0]) end,
    transform_bins(F, Term).

build_binary(Elements) ->
    list_to_binary(build_list(Elements)).

build_list(Elements) -> build_list(Elements, []).

build_list(0, Acc) -> Acc;
build_list(Elements, Acc) -> build_list(Elements-1, [random_char()|Acc]).


%% Convert all binaries in a list to writable binaries.

make_writable_binaries(Term) ->
    transform_bins(fun(Bin) -> <<Bin/binary,1,2,3>> end, Term).

append_to_writable_binaries(Term) ->
    transform_bins(fun(Bin) -> <<Bin/binary,0:(64*1024*8)>> end, Term).

random_char() ->
    uniform(256) - 1.

uniform(N) ->
    case get(random_seed) of
	undefined ->
	    {X, Y, Z} = time(),
	    random:seed(X, Y, Z);
	_ ->
	    ok
    end,
    random:uniform(N).

%% return millisecs from statistics source
erl_millisecs() ->
    {Ms, S, Us} = erlang:now(),
    Ms * 1000000000 + S * 1000 + Us / 1000.

erl_millisecs({Ms,S,Us}) ->
    Ms * 1000000000 + S * 1000 + Us / 1000.

%% Start/stop drivers.
start_driver(Config, Name, Binary) ->
    Path = ?config(data_dir, Config),
    erl_ddll:start(),

    %% Load the driver
    ok = load_driver(Path, Name),

    %% open port.
    case Binary of
	true ->
	    open_port({spawn, Name}, [binary]);
	false ->
	    open_port({spawn, Name}, [])
    end.

stop_driver(Port, Name) ->
    ?line true = erlang:port_close(Port),
    receive
	{Port,Message} ->
	    ?t:fail({strange_message_from_port,Message})
    after 0 ->
	    ok
    end,

    %% Unload the driver.
    ok = erl_ddll:unload_driver(Name),
    ?line ok = erl_ddll:stop().

load_driver(Dir, Driver) ->
    case erl_ddll:load_driver(Dir, Driver) of
	ok -> ok;
	{error, Error} = Res ->
	    io:format("~s\n", [erl_ddll:format_error(Error)]),
	    Res
    end.

sleep() ->
    receive after infinity -> ok end.

sleep(infinity) ->
    sleep();
sleep(Ms) when is_integer(Ms), Ms >= 0 ->
    receive after Ms -> ok end.


start_node(Config) when is_list(Config) ->
    ?line Pa = filename:dirname(code:which(?MODULE)),
    ?line {A, B, C} = now(),
    ?line Name = list_to_atom(atom_to_list(?MODULE)
			      ++ "-"
			      ++ atom_to_list(?config(testcase, Config))
			      ++ "-"
			      ++ integer_to_list(A)
			      ++ "-"
			      ++ integer_to_list(B)
			      ++ "-"
			      ++ integer_to_list(C)),
    ?line ?t:start_node(Name, slave, [{args, "-pa "++Pa}]).

stop_node(Node) ->
    ?t:stop_node(Node).