aboutsummaryrefslogblamecommitdiffstats
path: root/lib/kernel/test/gen_tcp_misc_SUITE.erl
blob: 2df4bf7c95b2a0af538864d5ffdb613ad9814617 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
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
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
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964

                   
  
                                                        
  




                                                                      
  



                                                                         
  



                            
                                                    


                      

                                                                    
                                                           
                                                              

                                                             
                                                 







                                                                             

                                                                
                                                                                 

                                                                     
                                                                              
                      

                    
                                                                             
                        
                                                                   
 







                                                                







                                                                 







                                                                      


                                                               


                                                         
                                  


                                     
                                         
 
         
                                                              
                                                  
                                               










                                                             
                                                                              
                                                                     
                  
                                                   



            





                         
                                     
           

                                    
           
 























































































































































































































                                                                           

























                                                                        





                                                                         









                                                        

        




                                                                                  







































                                                                           











































































































                                                              









                                                       









                                                     

                       









                                                                        









































































































                                                                         











                                                         































                                                                            


                              



                                                                          
                                                       


                                                                               
                                                                       


                                                                


                                                         



















































































































































































































































































































































































                                                                                      

                                                    

                                            
                          












































                                                                            
                                                                     


















                                                                              


                                                                    














































































































































































































































































































































































































































































































































































































































































































































































































                                                                                                                                







                                                            


                                                                       















                                       
                             
                               

                                                       




















                                                                           



























































































































                                                                                 

































                                                                                 
                                                           


















                                                                                         

















































































                                                                              

                                                                           
                                                                   

                                                                                    

                                                                  
                          





                                                      


                                                                  



                                          
                                    


                                                                          



                                                                 









                                                         
                                                      
               












































                                                                                                          











































































































































































































































































































                                                                                        



                                                                       
                                                         






















































                                                                                





                                             




                                                                 






















































                                                                   

                
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1998-2014. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
-module(gen_tcp_misc_SUITE).

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

%-compile(export_all).

-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, 
	 init_per_group/2,end_per_group/2, 
	 controlling_process/1, controlling_process_self/1,
	 no_accept/1, close_with_pending_output/1, active_n/1,
	 data_before_close/1, iter_max_socks/1, get_status/1,
	 passive_sockets/1, accept_closed_by_other_process/1,
	 init_per_testcase/2, end_per_testcase/2,
	 otp_3924/1, otp_3924_sender/4, closed_socket/1,
	 shutdown_active/1, shutdown_passive/1, shutdown_pending/1,
	 default_options/1, http_bad_packet/1, 
	 busy_send/1, busy_disconnect_passive/1, busy_disconnect_active/1,
	 fill_sendq/1, partial_recv_and_close/1, 
	 partial_recv_and_close_2/1,partial_recv_and_close_3/1,so_priority/1,
	 % Accept tests
	 primitive_accept/1,multi_accept_close_listen/1,accept_timeout/1,
	 accept_timeouts_in_order/1,accept_timeouts_in_order2/1,
	 accept_timeouts_in_order3/1,accept_timeouts_mixed/1, 
	 killing_acceptor/1,killing_multi_acceptors/1,killing_multi_acceptors2/1,
	 several_accepts_in_one_go/1, accept_system_limit/1,
	 active_once_closed/1, send_timeout/1, send_timeout_active/1,
	 otp_7731/1, zombie_sockets/1, otp_7816/1, otp_8102/1, wrapping_oct/1,
         otp_9389/1]).

%% Internal exports.
-export([sender/3, not_owner/1, passive_sockets_server/2, priority_server/1, 
	 oct_acceptor/1,
	 otp_7731_server/1, zombie_server/2, do_iter_max_socks/2]).

init_per_testcase(wrapping_oct, Config) when is_list(Config) ->
    Dog = case os:type() of
	      {ose,_} ->
		  test_server:timetrap(test_server:minutes(20));
	      _Else ->
		  test_server:timetrap(test_server:seconds(600))
	  end,
    [{watchdog, Dog}|Config];
init_per_testcase(iter_max_socks, Config) when is_list(Config) ->
    Dog = case os:type() of
	      {win32,_} ->
		  test_server:timetrap(test_server:minutes(30));
	      _Else ->
		  test_server:timetrap(test_server:seconds(240))
	  end,
    [{watchdog, Dog}|Config];
init_per_testcase(accept_system_limit, Config) when is_list(Config) ->
    case os:type() of
      {ose,_} -> 
          {skip,"Skip in OSE"};
      _ -> 
          Dog = test_server:timetrap(test_server:seconds(240)),
          [{watchdog,Dog}|Config]
    end;
init_per_testcase(wrapping_oct, Config) when is_list(Config) ->
    Dog = test_server:timetrap(test_server:seconds(600)),
    [{watchdog, Dog}|Config];
init_per_testcase(_Func, Config) when is_list(Config) ->
    Dog = test_server:timetrap(test_server:seconds(240)),
    [{watchdog, Dog}|Config].
end_per_testcase(_Func, Config) ->
    Dog = ?config(watchdog, Config),
    test_server:timetrap_cancel(Dog).

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

all() -> 
    [controlling_process, controlling_process_self, no_accept,
     close_with_pending_output, data_before_close,
     iter_max_socks, passive_sockets, active_n,
     accept_closed_by_other_process, otp_3924, closed_socket,
     shutdown_active, shutdown_passive, shutdown_pending,
     default_options, http_bad_packet, busy_send,
     busy_disconnect_passive, busy_disconnect_active,
     fill_sendq, partial_recv_and_close,
     partial_recv_and_close_2, partial_recv_and_close_3,
     so_priority, primitive_accept,
     multi_accept_close_listen, accept_timeout,
     accept_timeouts_in_order, accept_timeouts_in_order2,
     accept_timeouts_in_order3, accept_timeouts_mixed,
     killing_acceptor, killing_multi_acceptors,
     killing_multi_acceptors2, several_accepts_in_one_go, accept_system_limit,
     active_once_closed, send_timeout, send_timeout_active, otp_7731,
     wrapping_oct,
     zombie_sockets, otp_7816, otp_8102, otp_9389].

groups() -> 
    [].

init_per_suite(Config) ->
    Config.

end_per_suite(_Config) ->
    ok.

init_per_group(_GroupName, Config) ->
    Config.

end_per_group(_GroupName, Config) ->
    Config.



default_options(doc) ->
    ["Tests kernel application variables inet_default_listen_options and "
     "inet_default_connect_options"];
default_options(suite) ->
    [];
default_options(Config) when is_list(Config) ->
    %% First check the delay_send option
    ?line {true,true,true}=do_delay_send_1(),
    ?line {false,false,false}=do_delay_send_2(),
    ?line {true,false,false}=do_delay_send_3(),
    ?line {false,false,false}=do_delay_send_4(),
    ?line {false,false,false}=do_delay_send_5(),
    ?line {false,true,true}=do_delay_send_6(),
    %% Now lets start some nodes with different combinations of options:
    ?line {true,true,true} = do_delay_on_other_node("",
						    fun do_delay_send_1/0),
    ?line {true,false,false} = 
	do_delay_on_other_node("-kernel inet_default_connect_options "
			       "\"[{delay_send,true}]\"",
			       fun do_delay_send_2/0),
    
    ?line {false,true,true} = 
	do_delay_on_other_node("-kernel inet_default_listen_options "
			       "\"[{delay_send,true}]\"",
			       fun do_delay_send_2/0),
    
    ?line {true,true,true} = 
	do_delay_on_other_node("-kernel inet_default_listen_options "
			       "\"[{delay_send,true}]\"",
			       fun do_delay_send_3/0),
    ?line {true,true,true} = 
	do_delay_on_other_node("-kernel inet_default_connect_options "
			       "\"[{delay_send,true}]\"",
			       fun do_delay_send_6/0),
    ?line {false,false,false} = 
	do_delay_on_other_node("-kernel inet_default_connect_options "
			       "\"[{delay_send,true}]\"",
			       fun do_delay_send_5/0),
    ?line {false,true,true} = 
	do_delay_on_other_node("-kernel inet_default_connect_options "
			       "\"[{delay_send,true}]\" "
			       "-kernel inet_default_listen_options "
			       "\"[{delay_send,true}]\"",
			       fun do_delay_send_5/0),
    ?line {true,false,false} = 
	do_delay_on_other_node("-kernel inet_default_connect_options "
			       "\"[{delay_send,true}]\" "
			       "-kernel inet_default_listen_options "
			       "\"[{delay_send,true}]\"",
			       fun do_delay_send_4/0),
    ?line {true,true,true} = 
	do_delay_on_other_node("-kernel inet_default_connect_options "
			       "\"{delay_send,true}\" "
			       "-kernel inet_default_listen_options "
			       "\"{delay_send,true}\"",
			       fun do_delay_send_2/0),
    %% Active is to dangerous and is supressed
    ?line {true,true,true} = 
	do_delay_on_other_node("-kernel inet_default_connect_options "
			       "\"{active,false}\" "
			       "-kernel inet_default_listen_options "
			       "\"{active,false}\"",
			       fun do_delay_send_7/0),
    ?line {true,true,true} = 
	do_delay_on_other_node("-kernel inet_default_connect_options "
			       "\"[{active,false},{delay_send,true}]\" "
			       "-kernel inet_default_listen_options "
			       "\"[{active,false},{delay_send,true}]\"",
			       fun do_delay_send_7/0),
    ?line {true,true,true} = 
	do_delay_on_other_node("-kernel inet_default_connect_options "
			       "\"[{active,false},{delay_send,true}]\" "
			       "-kernel inet_default_listen_options "
			       "\"[{active,false},{delay_send,true}]\"",
			       fun do_delay_send_2/0),
    ok.


do_delay_on_other_node(XArgs, Function) ->
    Dir = filename:dirname(code:which(?MODULE)),
    {ok,Node} = test_server:start_node(test_default_options_slave,slave,
				       [{args,"-pa " ++ Dir ++ " " ++
					 XArgs}]),
    Res = rpc:call(Node,erlang,apply,[Function,[]]),
    test_server:stop_node(Node),
    Res.
					      

do_delay_send_1() ->
    {ok,LS}=gen_tcp:listen(0,[{delay_send,true}]),
    {ok,{{0,0,0,0},PortNum}}=inet:sockname(LS),
    {ok,S}=gen_tcp:connect("localhost",PortNum,[{delay_send,true}]),
    {ok,S2}= gen_tcp:accept(LS),
    {ok,[{delay_send,B1}]}=inet:getopts(S,[delay_send]),
    {ok,[{delay_send,B2}]}=inet:getopts(LS,[delay_send]),
    {ok,[{delay_send,B3}]}=inet:getopts(S2,[delay_send]),
    gen_tcp:close(S2),
    gen_tcp:close(S),
    gen_tcp:close(LS),
    {B1,B2,B3}.

do_delay_send_2() ->
    {ok,LS}=gen_tcp:listen(0,[]),
    {ok,{{0,0,0,0},PortNum}}=inet:sockname(LS),
    {ok,S}=gen_tcp:connect("localhost",PortNum,[]),
    {ok,S2}= gen_tcp:accept(LS),
    {ok,[{delay_send,B1}]}=inet:getopts(S,[delay_send]),
    {ok,[{delay_send,B2}]}=inet:getopts(LS,[delay_send]),
    {ok,[{delay_send,B3}]}=inet:getopts(S2,[delay_send]),
    gen_tcp:close(S2),
    gen_tcp:close(S),
    gen_tcp:close(LS),
    {B1,B2,B3}.

do_delay_send_3() ->
    {ok,LS}=gen_tcp:listen(0,[]),
    {ok,{{0,0,0,0},PortNum}}=inet:sockname(LS),
    {ok,S}=gen_tcp:connect("localhost",PortNum,[{delay_send,true}]),
    {ok,S2}= gen_tcp:accept(LS),
    {ok,[{delay_send,B1}]}=inet:getopts(S,[delay_send]),
    {ok,[{delay_send,B2}]}=inet:getopts(LS,[delay_send]),
    {ok,[{delay_send,B3}]}=inet:getopts(S2,[delay_send]),
    gen_tcp:close(S2),
    gen_tcp:close(S),
    gen_tcp:close(LS),
    {B1,B2,B3}.
    
do_delay_send_4() ->
    {ok,LS}=gen_tcp:listen(0,[{delay_send,false}]),
    {ok,{{0,0,0,0},PortNum}}=inet:sockname(LS),
    {ok,S}=gen_tcp:connect("localhost",PortNum,[]),
    {ok,S2}= gen_tcp:accept(LS),
    {ok,[{delay_send,B1}]}=inet:getopts(S,[delay_send]),
    {ok,[{delay_send,B2}]}=inet:getopts(LS,[delay_send]),
    {ok,[{delay_send,B3}]}=inet:getopts(S2,[delay_send]),
    gen_tcp:close(S2),
    gen_tcp:close(S),
    gen_tcp:close(LS),
    {B1,B2,B3}.
    
do_delay_send_5() ->
    {ok,LS}=gen_tcp:listen(0,[]),
    {ok,{{0,0,0,0},PortNum}}=inet:sockname(LS),
    {ok,S}=gen_tcp:connect("localhost",PortNum,[{delay_send,false}]),
    {ok,S2}= gen_tcp:accept(LS),
    {ok,[{delay_send,B1}]}=inet:getopts(S,[delay_send]),
    {ok,[{delay_send,B2}]}=inet:getopts(LS,[delay_send]),
    {ok,[{delay_send,B3}]}=inet:getopts(S2,[delay_send]),
    gen_tcp:close(S2),
    gen_tcp:close(S),
    gen_tcp:close(LS),
    {B1,B2,B3}.
    
do_delay_send_6() ->
    {ok,LS}=gen_tcp:listen(0,[{delay_send,true}]),
    {ok,{{0,0,0,0},PortNum}}=inet:sockname(LS),
    {ok,S}=gen_tcp:connect("localhost",PortNum,[]),
    {ok,S2}= gen_tcp:accept(LS),
    {ok,[{delay_send,B1}]}=inet:getopts(S,[delay_send]),
    {ok,[{delay_send,B2}]}=inet:getopts(LS,[delay_send]),
    {ok,[{delay_send,B3}]}=inet:getopts(S2,[delay_send]),
    gen_tcp:close(S2),
    gen_tcp:close(S),
    gen_tcp:close(LS),
    {B1,B2,B3}.
    
do_delay_send_7() ->
    {ok,LS}=gen_tcp:listen(0,[]),
    {ok,{{0,0,0,0},PortNum}}=inet:sockname(LS),
    {ok,S}=gen_tcp:connect("localhost",PortNum,[]),
    {ok,S2}= gen_tcp:accept(LS),
    {ok,[{active,B1}]}=inet:getopts(S,[active]),
    {ok,[{active,B2}]}=inet:getopts(LS,[active]),
    {ok,[{active,B3}]}=inet:getopts(S2,[active]),
    gen_tcp:close(S2),
    gen_tcp:close(S),
    gen_tcp:close(LS),
    {B1,B2,B3}.
    
 

controlling_process(doc) ->
    ["Open a listen port and change controlling_process for it",
     "The result should be ok of done by the owner process,"
     "Otherwise is should return {error,not_owner} or similar"];
controlling_process(suite) -> [];
controlling_process(Config) when is_list(Config) ->
    {ok,S} = gen_tcp:listen(0,[]),
    Pid2 = spawn(?MODULE,not_owner,[S]),
    Pid2 ! {self(),2,control},
    ?line {error, E} = receive {2,_E} ->
			      _E
		      after 10000 -> timeout
		      end,
    io:format("received ~p~n",[E]),
    Pid = spawn(?MODULE,not_owner,[S]),
    ?line ok = gen_tcp:controlling_process(S,Pid),
    Pid ! {self(),1,control},
    ?line ok = receive {1,ok} ->
		       ok
	       after 1000 -> timeout
	       end,
    Pid ! close.

not_owner(S) ->
    receive
	{From,Tag,control} ->
	    From ! {Tag,gen_tcp:controlling_process(S,self())};
	close ->
	    gen_tcp:close(S)
    after 1000 ->
	    ok
    end.

controlling_process_self(doc) ->
    ["Open a listen port and assign the controlling process to "
     "it self, then exit and make sure the port is closed properly."];
controlling_process_self(Config) when is_list(Config) ->
    S = self(),
    process_flag(trap_exit,true),
    spawn_link(fun() ->
		       {ok,Sock} = gen_tcp:listen(0,[]),
		       S ! {socket, Sock},
		       ok = gen_tcp:controlling_process(Sock,self()),
		       S ! done
	       end),
    receive
	done ->
	    receive
		{socket,Sock} ->
		    process_flag(trap_exit,false),
		    %% Make sure the port is invalid after process crash
		    {error,einval} = inet:port(Sock)
	    end;
	Msg when element(1,Msg) /= socket ->
	    process_flag(trap_exit,false),
	    exit({unknown_msg,Msg})
    end.
    

no_accept(doc) ->
    ["Open a listen port and connect to it, then close the listen port ",
     "without doing any accept.  The connected socket should receive ",
     "a tcp_closed message."];
no_accept(suite) -> [];
no_accept(Config) when is_list(Config) ->
    {ok, L} = gen_tcp:listen(0, []),
    {ok, {_, Port}} = inet:sockname(L),
    {ok, Client} = gen_tcp:connect(localhost, Port, []),
    ok = gen_tcp:close(L),
    receive
        {tcp_closed, Client} ->
            ok
    after 5000 ->
            ?line test_server:fail(never_closed)
    
    end.

close_with_pending_output(doc) ->
    ["Send several packets to a socket and close it.  All packets should arrive ",
     "to the other end."];
close_with_pending_output(suite) -> [];
close_with_pending_output(Config) when is_list(Config) ->
    ?line {ok, L} = gen_tcp:listen(0, [binary, {active, false}]),
    ?line {ok, {_, Port}} = inet:sockname(L),
    ?line Packets = 16,
    ?line Total = 2048*Packets,
    case start_remote(close_pending) of
	{ok, Node} ->
	    ?line {ok, Host} = inet:gethostname(),
	    ?line spawn_link(Node, ?MODULE, sender, [Port, Packets, Host]),
	    ?line {ok, A} = gen_tcp:accept(L),
	    ?line case gen_tcp:recv(A, Total) of
		      {ok, Bin} when byte_size(Bin) == Total ->
			  gen_tcp:close(A),
			  gen_tcp:close(L);
		      {ok, Bin} ->
			  ?line test_server:fail({small_packet, 
                                                  byte_size(Bin)});
		      Error ->
			  ?line test_server:fail({unexpected, Error})
		  end,
	    ok;
	{error, no_remote_hosts} ->
	    {skipped,"No remote hosts"};
	{error, Other} ->
	    ?line ?t:fail({failed_to_start_slave_node, Other})
    end.

sender(Port, Packets, Host) ->
    X256 = lists:seq(0, 255),
    X512 = [X256|X256],
    X1K = [X512|X512],
    Bin = list_to_binary([X1K|X1K]),
    {ok, Sock} = gen_tcp:connect(Host, Port, []),
    send_loop(Sock, Bin, Packets),
    ok = gen_tcp:close(Sock).

send_loop(_Sock, _Data, 0) -> ok;
send_loop(Sock, Data, Left) ->
    ok = gen_tcp:send(Sock, Data),
    send_loop(Sock, Data, Left-1).

%% Test {active,N} option
active_n(doc) ->
    ["Verify operation of the {active,N} option."];
active_n(suite) -> [];
active_n(Config) when is_list(Config) ->
    N = 3,
    LS = ok(gen_tcp:listen(0, [{active,N}])),
    [{active,N}] = ok(inet:getopts(LS, [active])),
    ok = inet:setopts(LS, [{active,-N}]),
    receive
        {tcp_passive, LS} -> ok
    after
        5000 ->
            exit({error,tcp_passive_failure})
    end,
    [{active,false}] = ok(inet:getopts(LS, [active])),
    ok = inet:setopts(LS, [{active,0}]),
    receive
        {tcp_passive, LS} -> ok
    after
        5000 ->
            exit({error,tcp_passive_failure})
    end,
    ok = inet:setopts(LS, [{active,32767}]),
    {error,einval} = inet:setopts(LS, [{active,1}]),
    {error,einval} = inet:setopts(LS, [{active,-32769}]),
    ok = inet:setopts(LS, [{active,-32768}]),
    receive
        {tcp_passive, LS} -> ok
    after
        5000 ->
            exit({error,tcp_passive_failure})
    end,
    [{active,false}] = ok(inet:getopts(LS, [active])),
    ok = inet:setopts(LS, [{active,N}]),
    ok = inet:setopts(LS, [{active,true}]),
    [{active,true}] = ok(inet:getopts(LS, [active])),
    receive
        _ -> exit({error,active_n})
    after
        0 ->
            ok
    end,
    ok = inet:setopts(LS, [{active,N}]),
    ok = inet:setopts(LS, [{active,once}]),
    [{active,once}] = ok(inet:getopts(LS, [active])),
    receive
        _ -> exit({error,active_n})
    after
        0 ->
            ok
    end,
    {error,einval} = inet:setopts(LS, [{active,32768}]),
    ok = inet:setopts(LS, [{active,false}]),
    [{active,false}] = ok(inet:getopts(LS, [active])),
    Port = ok(inet:port(LS)),
    C = ok(gen_tcp:connect("localhost", Port, [{active,N}])),
    [{active,N}] = ok(inet:getopts(C, [active])),
    S = ok(gen_tcp:accept(LS)),
    ok = inet:setopts(S, [{active,N}]),
    [{active,N}] = ok(inet:getopts(S, [active])),
    repeat(3,
           fun(I) ->
                   Msg = "message "++integer_to_list(I),
                   ok = gen_tcp:send(C, Msg),
                   receive
                       {tcp,S,Msg} ->
                           ok = gen_tcp:send(S, Msg)
                   after
                       5000 ->
                           exit({error,timeout})
                   end,
                   receive
                       {tcp,C,Msg} ->
                           ok
                   after
                       5000 ->
                           exit({error,timeout})
                   end
           end),
    receive
        {tcp_passive,S} ->
            [{active,false}] = ok(inet:getopts(S, [active]))
    after
        5000 ->
            exit({error,tcp_passive})
    end,
    receive
        {tcp_passive,C} ->
            [{active,false}] = ok(inet:getopts(C, [active]))
    after
        5000 ->
            exit({error,tcp_passive})
    end,
    LS2 = ok(gen_tcp:listen(0, [{active,0}])),
    receive
        {tcp_passive,LS2} ->
            [{active,false}] = ok(inet:getopts(LS2, [active]))
    after
        5000 ->
            exit({error,tcp_passive})
    end,
    ok = gen_tcp:close(LS2),
    ok = gen_tcp:close(C),
    ok = gen_tcp:close(S),
    ok = gen_tcp:close(LS),
    ok.

-define(OTP_3924_MAX_DELAY, 100).
%% Taken out of the blue, but on intra host connections
%% I expect propagation of a close to be quite fast
%% so 100 ms seems reasonable.

otp_3924(doc) ->
    ["Tests that a socket can be closed fast enough."];
otp_3924(suite) -> [];
otp_3924(Config) when is_list(Config) ->
    MaxDelay = (case has_superfluous_schedulers() of
	    true -> 4;
	    false -> 1
	end
	* case {erlang:system_info(debug_compiled),
		erlang:system_info(lock_checking)} of
	    {true, _} -> 6;
	    {_, true} -> 2;
	    _ -> 1
	end * ?OTP_3924_MAX_DELAY),
    otp_3924_1(MaxDelay).

otp_3924_1(MaxDelay) ->
    ?line {ok, Node} = start_node(otp_3924),
    ?line DataLen = 100*1024,
    ?line Data = otp_3924_data(DataLen),
    % Repeat the test a couple of times to prevent the test from passing
    % by chance.
    repeat(10,
	   fun (N) ->
		   ?line ok = otp_3924(MaxDelay, Node, Data, DataLen, N)
	   end),
    ?line test_server:stop_node(Node),
    ok.

otp_3924(MaxDelay, Node, Data, DataLen, N) ->
    ?line {ok, L} = gen_tcp:listen(0, [list, {active, false}]),
    ?line {ok, {_, Port}} = inet:sockname(L),
    ?line {ok, Host} = inet:gethostname(),
    ?line Sender = spawn_link(Node,
			      ?MODULE,
			      otp_3924_sender,
			      [self(), Host, Port, Data]),
    ?line Data = otp_3924_receive_data(L, Sender, MaxDelay, DataLen, N),
    ?line ok = gen_tcp:close(L).

otp_3924_receive_data(LSock, Sender, MaxDelay, Len, N) ->
    ?line OP = process_flag(priority, max),
    ?line OTE = process_flag(trap_exit, true),
    ?line TimeoutRef = make_ref(),
    ?line Data = (catch begin
			    ?line Sender ! start,
			    ?line {ok, Sock} = gen_tcp:accept(LSock),
			    ?line D = otp_3924_receive_data(Sock,
							    TimeoutRef,
							    MaxDelay,
							    Len,
							    [],
							    0),
			    ?line ok = gen_tcp:close(Sock),
			    D
			end),
    ?line unlink(Sender),
    ?line process_flag(trap_exit, OTE),
    ?line process_flag(priority, OP),
    receive
	{'EXIT', _, TimeoutRef} ->
	    ?line test_server:fail({close_not_fast_enough,MaxDelay,N});
	{'EXIT', Sender, Reason} ->
	    ?line test_server:fail({sender_exited, Reason});
	{'EXIT', _Other, Reason} ->
	    ?line test_server:fail({linked_process_exited, Reason})
    after 0 ->
	    case Data of
		{'EXIT', {A,B}} ->
		    ?line test_server:fail({A,B,N});
		{'EXIT', Failure} ->
		    ?line test_server:fail(Failure);
		_ ->
		    ?line Data
	    end
    end.
    

otp_3924_receive_data(Sock, TimeoutRef, MaxDelay, Len, Acc, AccLen) ->
    case gen_tcp:recv(Sock, 0) of
	{ok, Data} ->
	    NewAccLen = AccLen + length(Data),
	    if
		NewAccLen == Len ->
		    ?line {ok, TRef} = timer:exit_after(MaxDelay,
							self(),
							TimeoutRef),
		    ?line {error, closed} = gen_tcp:recv(Sock, 0),
		    ?line timer:cancel(TRef),
		    ?line lists:flatten([Acc, Data]);
		NewAccLen > Len ->
		    exit({received_too_much, NewAccLen});
		true ->
		    otp_3924_receive_data(Sock,
					  TimeoutRef,
					  MaxDelay,
					  Len,
					  [Acc, Data],
					  NewAccLen)
	    end;
	{error, closed} ->
	    exit({premature_close, AccLen});
	Error ->
	    exit({unexpected_error, Error})
    end.
    
otp_3924_data(Size) ->
    Block =
	"This is a sequence of characters that will be repeated "
	"again and again and again and again and again and ...  ",
    L = length(Block), 
    otp_3924_data(Block, [], Size div L, Size rem L).

otp_3924_data(_, Acc, 0, 0) ->
    lists:flatten(Acc);
otp_3924_data(_, Acc, 0, SingleLeft) ->
    otp_3924_data(false, ["."|Acc], 0, SingleLeft-1);
otp_3924_data(Block, Acc, BlockLeft, SingleLeft) ->
    otp_3924_data(Block, [Block|Acc], BlockLeft-1, SingleLeft).

otp_3924_sender(Receiver, Host, Port, Data) ->
    receive
	start ->
	    {ok, Sock} = gen_tcp:connect(Host, Port, [list]),
	    gen_tcp:send(Sock, Data),
	    ok = gen_tcp:close(Sock),
	    unlink(Receiver)
    end.


data_before_close(doc) ->
    ["Tests that a huge amount of data can be received before a close."];
data_before_close(Config) when is_list(Config) ->
    {ok, L} = gen_tcp:listen(0, [binary]),
    {ok, {_, TcpPort}} = inet:sockname(L),
    Bytes = 256*1024,
    spawn_link(fun() -> huge_sender(TcpPort, Bytes) end),
    {ok, A} = gen_tcp:accept(L),
    case count_bytes_recv(A, 0) of
        {Bytes, Result} ->
            io:format("Result: ~p", [Result]);
        {Wrong, Result} ->
            io:format("Result: ~p", [Result]),
            test_server:fail({wrong_count, Wrong})
    end,
    ok.

count_bytes_recv(Sock, Total) ->
    receive
	{tcp, Sock, Bin} ->
	    count_bytes_recv(Sock, Total+byte_size(Bin));
	Other ->
	    {Total, Other}
    end.

huge_sender(TcpPort, Bytes) ->
    {ok, Client} = gen_tcp:connect(localhost, TcpPort, []),
    receive after 500 -> ok end,
    gen_tcp:send(Client, make_zero_packet(Bytes)),
    gen_tcp:close(Client).

make_zero_packet(0) -> [];
make_zero_packet(N) when N rem 2 == 0 ->
    P = make_zero_packet(N div 2),
    [P|P];
make_zero_packet(N) ->
    P = make_zero_packet(N div 2),
    [0, P|P].
get_status(doc) ->    
    ["OTP-2924",
     "test that the socket process does not crash when sys:get_status(Pid)",
     "is called."];
get_status(suite) -> [];
get_status(Config) when is_list(Config) ->
    ?line {ok,{socket,Pid,_,_}} = gen_tcp:listen(5678,[]),
    ?line {status,Pid,_,_} = sys:get_status(Pid).

-define(RECOVER_SLEEP, 60000).
-define(RETRY_SLEEP, 15000).

iter_max_socks(doc) ->
    ["Open as many sockets as possible. Do this several times and check ",
     "that we get the same number of sockets every time."];
iter_max_socks(Config) when is_list(Config) ->
    N = case os:type() of {win32,_} -> 10; _ -> 20 end,
    %% Run on a different node in order to limit the effect if this test fails.
    Dir = filename:dirname(code:which(?MODULE)),
    {ok,Node} = test_server:start_node(test_iter_max_socks,slave,
				       [{args,"+Q 2048 -pa " ++ Dir}]),
    L = rpc:call(Node,?MODULE,do_iter_max_socks,[N, initalize]),
    test_server:stop_node(Node),

    io:format("Result: ~p",[L]),
    all_equal(L),
    {comment, "Max sockets: " ++ integer_to_list(hd(L))}.

do_iter_max_socks(0, _) ->
    [];
do_iter_max_socks(N, initalize) ->
    MS = max_socks(),
    [MS|do_iter_max_socks(N-1, MS)];
do_iter_max_socks(N, failed) ->
    MS = max_socks(),
    [MS|do_iter_max_socks(N-1, failed)];
do_iter_max_socks(N, First) when is_integer(First) ->
    ?line MS = max_socks(),
    if MS == First -> 
	    ?line [MS|do_iter_max_socks(N-1, First)];
       true ->
	    ?line io:format("Sleeping for ~p seconds...~n",
			    [?RETRY_SLEEP/1000]), 
	    ?line ?t:sleep(?RETRY_SLEEP),
	    ?line io:format("Trying again...~n", []),
	    ?line RetryMS = max_socks(),
	    ?line if RetryMS == First ->
			  ?line [RetryMS|do_iter_max_socks(N-1, First)];
		     true ->
			  ?line [RetryMS|do_iter_max_socks(N-1, failed)]
		  end
    end.

all_equal([]) ->
    ok;
all_equal([Rule | T]) ->
    all_equal(Rule, T).

all_equal(Rule, [Rule | T]) ->
    all_equal(Rule, T);
all_equal(_, [_ | _]) ->
    ?line ?t:sleep(?RECOVER_SLEEP), % Wait a while and *hope* that we'll
                                    % recover so other tests won't be
                                    % affected.
    ?t:fail(max_socket_mismatch);
all_equal(_Rule, []) ->
    ok.

max_socks() ->
    ?line Socks = open_socks(),
    ?line N = length(Socks),
    ?line lists:foreach(fun(S) -> ok = gen_tcp:close(S) end, Socks),
    io:format("Got ~p sockets", [N]),
    N.

open_socks() ->
    case gen_tcp:listen(0, []) of
	{ok, L} ->
	    {ok, {_, Port}} = inet:sockname(L),
	    [L| connect_accept(L, Port)];
	_ ->
	    []
    end.

connect_accept(L, Port) ->
    case gen_tcp:connect(localhost, Port, []) of
	{ok, C} ->
	    [C| do_accept(L, Port)];
	_ ->
	    []
    end.

do_accept(L, Port) ->
    case gen_tcp:accept(L) of
	{ok, A} -> [A| connect_accept(L, Port)];
	_ -> []
    end.

start_node(Name) ->
    Pa = filename:dirname(code:which(?MODULE)),
    test_server:start_node(Name, slave, [{args, "-pa " ++ Pa}]).

start_remote(Name) ->
    Pa = filename:dirname(code:which(?MODULE)),
    test_server:start_node(Name, slave, [{remote, true}, {args, "-pa " ++ Pa}]).

passive_sockets(doc) ->
    ["Tests that when 'the other side' on a passive socket closes, the connecting",
     "side still can read until the end of data."];
passive_sockets(Config) when is_list(Config) ->
    ?line spawn_link(?MODULE, passive_sockets_server,
		     [[{active,false}],self()]),
    ?line receive
	      {socket,Port} -> ok
	  end,
    ?t:sleep(500),
    ?line case gen_tcp:connect("localhost", Port, [{active, false}]) of
	      {ok, Sock} ->
		  passive_sockets_read(Sock);
	      Error ->
		  ?t:fail({"Could not connect to server", Error})
	  end.

%%
%% Read until we get an {error, closed}. If we get another error, this test case
%% should fail.
%%
passive_sockets_read(Sock) ->
    case gen_tcp:recv(Sock, 0, 2000) of
	{ok, Data} ->
	    io:format("Received ~p bytes~n", [length(Data)]),
	    passive_sockets_read(Sock);
	{error, closed} ->
	    gen_tcp:close(Sock);
	Error ->
	    gen_tcp:close(Sock),
	    ?t:fail({"Did not get {error, closed} before other error", Error})
    end.

passive_sockets_server(Opts, Parent) ->
    ?line case gen_tcp:listen(0, Opts) of
	      {ok, LSock} ->
		  {ok,{_,Port}} = inet:sockname(LSock),
		  Parent ! {socket,Port},
		  passive_sockets_server_accept(LSock);
	      Error ->
		  ?t:fail({"Could not create listen socket", Error})
	  end.

passive_sockets_server_accept(Sock) ->
    ?line case gen_tcp:accept(Sock) of
	      {ok, Socket} ->
		  ?t:sleep(500),   % Simulate latency
		  passive_sockets_server_send(Socket, 5),
		  passive_sockets_server_accept(Sock);
	      Error ->
		  ?t:fail({"Could not accept connection", Error})
	  end.

passive_sockets_server_send(Socket, 0) ->
    io:format("Closing other end..~n", []),
    gen_tcp:close(Socket);
passive_sockets_server_send(Socket, X) ->
    ?line Data = lists:duplicate(1024*X, $a),
    ?line case gen_tcp:send(Socket, Data) of
	      ok ->
		  ?t:sleep(50),   % Simulate some processing.
		  passive_sockets_server_send(Socket, X-1);
	      {error, _Reason} ->
		  ?t:fail("Failed to send data")
	  end.


accept_closed_by_other_process(doc) ->
    ["Tests the return value from gen_tcp:accept when ",
     "the socket is closed from an other process. (OTP-3817)"];
accept_closed_by_other_process(Config) when is_list(Config) ->
    ?line Parent = self(),
    ?line {ok, ListenSocket} = gen_tcp:listen(0, []),
    ?line Child = 
	spawn_link(
	  fun() ->
		  Parent ! {self(), gen_tcp:accept(ListenSocket)}
	  end),
    ?line receive after 1000 -> ok end,
    ?line ok = gen_tcp:close(ListenSocket),
    ?line receive
	      {Child, {error, closed}} ->
		  ok;
	      {Child, Other} ->
		  ?t:fail({"Wrong result of gen_tcp:accept", Other})
	  end.

repeat(N, Fun) ->
    repeat(N, N, Fun).

repeat(N, T, Fun) when is_integer(N), N > 0 ->
    Fun(T-N),
    repeat(N-1, T, Fun);
repeat(_, _, _) ->
    ok.


closed_socket(suite) ->
    [];
closed_socket(doc) ->
    ["Tests the response when using a closed socket as argument"];
closed_socket(Config) when is_list(Config) ->
    ?line {ok, LS1} = gen_tcp:listen(0, []),
    ?line erlang:yield(),
    ?line ok = gen_tcp:close(LS1),
    %% If the following delay is uncommented, the result error values
    %% below will change from {error, einval} to {error, closed} since
    %% inet_db then will have noticed that the socket is closed.
    %% This is a scheduling issue, i.e when the gen_server in 
    %% in inet_db processes the 'EXIT' message from the port,
    %% the socket is unregistered.
    %%
    %% ?line test_server:sleep(test_server:seconds(2)),
    %%
    ?line {error, R_send} = gen_tcp:send(LS1, "data"),
    ?line {error, R_recv} = gen_tcp:recv(LS1, 17),
    ?line {error, R_accept} = gen_tcp:accept(LS1),
    ?line {error, R_controlling_process} = 
	gen_tcp:controlling_process(LS1, self()),
    %%
    ?line ok = io:format("R_send = ~p~n", [R_send]),
    ?line ok = io:format("R_recv = ~p~n", [R_recv]),
    ?line ok = io:format("R_accept = ~p~n", [R_accept]),
    ?line ok = io:format("R_controlling_process = ~p~n", 
			 [R_controlling_process]),
    ok.

%%%
%%% Test using the gen_tcp:shutdown/2 function using a sort server.
%%% 

shutdown_active(Config) when is_list(Config) ->
    ?line shutdown_common(true).

shutdown_passive(Config) when is_list(Config) ->
    ?line shutdown_common(false).

shutdown_common(Active) ->
    ?line P = sort_server(Active),
    io:format("Sort server port: ~p\n", [P]),

    ?line do_sort(P, []),
    ?line do_sort(P, ["glurf"]),
    ?line do_sort(P, ["abc","nisse","dum"]),

    ?line do_sort(P, [lists:reverse(integer_to_list(I)) || I <- lists:seq(25, 255)]),
    ?line do_sort(P, [lists:reverse(integer_to_list(I)) || I <- lists:seq(77, 999)]),
    ?line do_sort(P, [lists:reverse(integer_to_list(I)) || I <- lists:seq(25, 55)]),
    ?line do_sort(P, []),
    ?line do_sort(P, ["apa"]),
    ?line do_sort(P, ["kluns","gorilla"]),
    ?line do_sort(P, [lists:reverse(integer_to_list(I)) || I <- lists:seq(25, 1233)]),
    ?line do_sort(P, []),

    receive
	Any ->
	    ?t:fail({unexpected_message,Any})
    after 0 -> ok
    end.

do_sort(P, List0) ->
    List = [El++"\n" || El <- List0],
    {ok,S} = gen_tcp:connect(localhost, P, [{packet,line}]),
    send_lines(S, List),
    gen_tcp:shutdown(S, write),
    Lines = collect_lines(S, true),
    io:format("~p\n", [Lines]),
    Lines = lists:sort(List),
    ok = gen_tcp:close(S).

sort_server(Active) ->
    Opts = [{exit_on_close,false},{packet,line},{active,Active}],
    ?line {ok,L} = gen_tcp:listen(0, Opts),
    Go = make_ref(),
    ?line Pid = spawn_link(fun() ->
				   receive Go -> sort_server_1(L, Active) end
			   end),
    ?line ok = gen_tcp:controlling_process(L, Pid),
    ?line Pid ! Go,
    ?line {ok,Port} = inet:port(L),
    Port.

sort_server_1(L, Active) ->
    {ok,S} = gen_tcp:accept(L),
    Go = make_ref(),
    Sorter = spawn(fun() -> receive Go -> sorter(S, Active) end end),
    ok = gen_tcp:controlling_process(S, Sorter),
    Sorter ! Go,
    sort_server_1(L, Active).

sorter(S, Active) ->
    Lines = collect_lines(S, Active),
    send_lines(S, lists:sort(Lines)),
    gen_tcp:shutdown(S, write),
    gen_tcp:close(S).

collect_lines(S, true) ->
    collect_lines_1(S, []);
collect_lines(S, false) ->
    passive_collect_lines_1(S, []).

collect_lines_1(S, Acc) ->
    receive
	{tcp,S,Line} -> collect_lines_1(S, [Line|Acc]);
	{tcp_closed,S} -> lists:reverse(Acc)
    end.

passive_collect_lines_1(S, Acc) ->
    case gen_tcp:recv(S, 0) of
	{ok,Line} -> passive_collect_lines_1(S, [Line|Acc]);
	{error,closed} -> lists:reverse(Acc)
    end.


send_lines(S, Lines) ->    
    lists:foreach(fun(Line) ->
			  gen_tcp:send(S, Line)
		  end, Lines).

%%%
%%% Shutdown pending.
%%%

shutdown_pending(Config) when is_list(Config) ->
    N = 512*1024+17,
    io:format("~p\n", [N]),
    Data = [<<N:32>>,ones(N),42],
    P = a_server(),
    io:format("Server port: ~p\n", [P]),
    ?line {ok,S} = gen_tcp:connect(localhost, P, []),
    ?line gen_tcp:send(S, Data),
    ?line gen_tcp:shutdown(S, write),
    ?line receive
	      {tcp,S,Msg} ->
		  io:format("~p\n", [Msg]),
		  ?line N = list_to_integer(Msg) - 5;
	      Other ->
		  ?t:fail({unexpected,Other})
	  end,
     ok.

 ones(0) -> [];
 ones(1) -> [1];
 ones(N) ->
     Half = N div 2,
     Ones = ones(Half),
     case 2*Half of
	 N -> [Ones|Ones];
	 _ -> [1,Ones|Ones]
     end.

 a_server() ->
     ?line {ok,L} = gen_tcp:listen(0, [{exit_on_close,false},{active,false}]),
     ?line Pid = spawn_link(fun() -> a_server(L) end),
     ?line ok = gen_tcp:controlling_process(L, Pid),
     ?line {ok,Port} = inet:port(L),
     Port.

 a_server(L) ->
     {ok,S} = gen_tcp:accept(L),
     do_recv(S, []).

 do_recv(S, Bs0) ->
     case gen_tcp:recv(S, 0) of
	 {ok,B} ->
	     do_recv(S, [Bs0,B]);
	 {error,closed} ->
	     Bs = list_to_binary(Bs0),
	     gen_tcp:send(S, integer_to_list(byte_size(Bs))),
	     gen_tcp:close(S)
     end.


%% Thanks to Luke Gorrie. Tests for a very specific problem with 
%% corrupt data. The testcase will be killed by the timetrap timeout
%% if the bug is present.
http_bad_packet(Config) when is_list(Config) ->
    ?line {ok,L} = gen_tcp:listen(0,
				  [{active, false},
				   binary,
				   {reuseaddr, true},
				   {packet, http}]),
    ?line {ok,Port} = inet:port(L),
    ?line spawn_link(fun() -> erlang:yield(), http_bad_client(Port) end),
    ?line case gen_tcp:accept(L) of
	      {ok,S} ->
		  http_worker(S);
	      Err ->
		  exit({accept,Err})
	  end.

http_worker(S) ->
    case gen_tcp:recv(S, 0, 30000) of
	{ok,{http_error,Error}} ->
	     io:format("Http error: ~s\n", [Error]);
	{ok,Data} ->
	    io:format("Data: ~p\n", [Data]),
	    http_worker(S)
    end.

http_bad_client(Port) ->
    {ok,S} = gen_tcp:connect("localhost", Port, [{active,false}, binary]),
    ok = gen_tcp:send(S, "\r\n"),
    ok = gen_tcp:close(S).


%% Fill send queue and then start receiving.
%%
busy_send(Config) when is_list(Config) ->
    ?line Master = self(),
    ?line Msg = <<"the quick brown fox jumps over a lazy dog~n">>,
    ?line Server =
	spawn_link(fun () ->
			   {ok,L} = gen_tcp:listen
				      (0, [{active,false},binary,
					   {reuseaddr,true},{packet,0}]),
			   {ok,Port} = inet:port(L),
			   Master ! {self(),client,
				     busy_send_client(Port, Master, Msg)},
			   busy_send_srv(L, Master, Msg)
		   end),
    ?line io:format("~p Server~n", [Server]),
    ?line receive 
	      {Server,client,Client} ->
		  ?line io:format("~p Client~n", [Client]),
		  ?line busy_send_loop(Server, Client, 0)
	  end.

busy_send_loop(Server, Client, N) ->
    %% Master
    %%
    ?line receive {Server,send} ->
		  busy_send_loop(Server, Client, N+1)
	  after 2000 ->
		  %% Send queue full, sender blocked 
		  %% -> stop sender and release client
		  ?line io:format("Send timeout, time to receive...~n", []),
		  ?line Server ! {self(),close},
		  ?line Client ! {self(),recv,N+1},
		  ?line receive
			    {Server,send} ->
				?line busy_send_2(Server, Client, N+1)
			after 10000 ->
				%% If this happens, see busy_send_srv
				?t:fail({timeout,{server,not_send,flush([])}})
			end
	  end.

busy_send_2(Server, Client, _N) ->
    %% Master
    %%
    ?line receive
	      {Server,[closed]} ->
		  ?line receive 
			    {Client,[0,{error,closed}]} -> 
				ok 
			end
	  after 10000 ->
		  ?t:fail({timeout,{server,not_closed,flush([])}})
	  end.

busy_send_srv(L, Master, Msg) ->
    %% Server
    %% Sometimes this accept does not return, do not really know why
    %% but is causes the timeout error in busy_send_loop to be
    %% triggered. Only happens on OS X Leopard?!?
    {ok,Socket} = gen_tcp:accept(L),
    busy_send_srv_loop(Socket, Master, Msg).

busy_send_srv_loop(Socket, Master, Msg) ->
    %% Server
    %%
    receive
	{Master,close} ->
	    ok = gen_tcp:close(Socket),
	    Master ! {self(),flush([closed])}
    after 0 ->
	    ok = gen_tcp:send(Socket, Msg),
	    Master ! {self(),send},
	    busy_send_srv_loop(Socket, Master, Msg)
    end.

busy_send_client(Port, Master, Msg) ->    
    %% Client
    %%
    spawn_link(
      fun () ->
	      {ok,Socket} = gen_tcp:connect(
			 "localhost", Port,
			 [{active,false},binary,{packet,0}]),
	      receive
		  {Master,recv, N} ->
		      busy_send_client_loop(Socket, Master, Msg, N)
	      end
      end).

busy_send_client_loop(Socket, Master, Msg, N) ->
    %% Client
    %%
    Size = byte_size(Msg),
    case gen_tcp:recv(Socket, Size) of
	{ok,Msg} ->
	    busy_send_client_loop(Socket, Master, Msg, N-1);
	Other ->
	    Master ! {self(),flush([Other,N])}
    end.

%%%
%%% Send to a socket whose other end does not read until the port gets busy.
%%% Then close the other end. The writer should get an {error,closed} error.
%%% (Passive mode.)
%%%

busy_disconnect_passive(Config) when is_list(Config) ->
    MuchoData = list_to_binary(ones(64*1024)),
    ?line [do_busy_disconnect_passive(MuchoData) || _ <- lists:seq(1, 10)],
    ok.

do_busy_disconnect_passive(MuchoData) ->
    S = busy_disconnect_prepare_server([{active,false}]),
    busy_disconnect_passive_send(S, MuchoData).

busy_disconnect_passive_send(S, Data) ->
    ?line case gen_tcp:send(S, Data) of
	ok -> ?line busy_disconnect_passive_send(S, Data);
	{error,closed} -> ok
    end.

%%%
%%% Send to a socket whose other end does not read until the port gets busy.
%%% Then close the other end. The writer should get an {error,closed} error and
%%% a {tcp_closed,Socket} message. (Active mode.)
%%%
busy_disconnect_active(Config) when is_list(Config) ->
    MuchoData = list_to_binary(ones(64*1024)),
    ?line [do_busy_disconnect_active(MuchoData) || _ <- lists:seq(1, 10)],
    ok.

do_busy_disconnect_active(MuchoData) ->
    S = busy_disconnect_prepare_server([{active,true}]),
    busy_disconnect_active_send(S, MuchoData).

busy_disconnect_active_send(S, Data) ->
    ?line case gen_tcp:send(S, Data) of
	ok -> ?line busy_disconnect_active_send(S, Data);
	{error,closed} ->
	    receive
		{tcp_closed,S} -> ok;
		_Other -> ?line ?t:fail()
	    end
    end.


busy_disconnect_prepare_server(ConnectOpts) ->
    ?line Sender = self(),
    ?line Server = spawn_link(fun() -> busy_disconnect_server(Sender) end),
    receive {port,Server,Port} -> ok end,
    ?line {ok,S} = gen_tcp:connect(localhost, Port, ConnectOpts),
    Server ! {Sender,sending},
    S.

busy_disconnect_server(Sender) ->
    {ok,L} = gen_tcp:listen(0, [{active,false},binary,{reuseaddr,true},{packet,0}]),
    {ok,Port} = inet:port(L),
    Sender ! {port,self(),Port},
    {ok,S} = gen_tcp:accept(L),
    receive
	{Sender,sending} ->
	    busy_disconnect_server_wait_for_busy(Sender, S)
    end.

%% Close the socket as soon as the Sender process can't send because of
%% a busy port.
busy_disconnect_server_wait_for_busy(Sender, S) ->
    case process_info(Sender, status) of
	{status,waiting} ->
	    %% We KNOW that the sender will be in state 'waiting' only
	    %% if the port has become busy. (Fallback solution if the
	    %% implementation changes: Watch Sender's reduction count;
	    %% when it stops changing, wait 2 seconds and then close.)
	    gen_tcp:close(S);
	_Other ->
	    io:format("~p\n", [_Other]),
	    timer:sleep(100),
	    busy_disconnect_server_wait_for_busy(Sender, S)
    end.

%%%
%%% Fill send queue
%%%
fill_sendq(Config) when is_list(Config) ->
    ?line Master = self(),
    ?line Server = 
	spawn_link(fun () ->
			   {ok,L} = gen_tcp:listen
				      (0, [{active,false},binary,
					   {reuseaddr,true},{packet,0}]),
			   {ok,Port} = inet:port(L),
			   Master ! {self(),client,
				     fill_sendq_client(Port, Master)},
			   fill_sendq_srv(L, Master)
		   end),
    ?line io:format("~p Server~n", [Server]),
    ?line receive {Server,client,Client} ->
		  ?line io:format("~p Client~n", [Client]),
		  ?line receive {Server,reader,Reader} ->
				?line io:format("~p Reader~n", [Reader]),
				?line fill_sendq_loop(Server, Client, Reader)
	    end
    end.

fill_sendq_loop(Server, Client, Reader) ->
    %% Master
    %%
    receive {Server,send} ->
	    fill_sendq_loop(Server, Client, Reader)
    after 2000 ->
	    %% Send queue full, sender blocked -> close client.
	    ?line io:format("Send timeout, closing Client...~n", []),
	    ?line Client ! {self(),close},
	    ?line receive {Server,[{error,closed}]} ->
			  ?line io:format("Got server closed.~n"),
			  ?line receive {Reader,[{error,closed}]} ->
					?line io:format
						("Got reader closed.~n"),
					ok
				after 3000 ->
					?t:fail({timeout,{closed,reader}})
				end;
			  {Reader,[{error,closed}]} ->
			  ?line io:format("Got reader closed.~n"),
			  ?line receive {Server,[{error,closed}]} ->
					?line io:format("Got server closed~n"),
					ok
				after 3000 ->
					?t:fail({timeout,{closed,server}})
				end
		  after 3000 ->
			  ?t:fail({timeout,{closed,[server,reader]}})
		  end
    end.

fill_sendq_srv(L, Master) ->
    %% Server
    %%
    case gen_tcp:accept(L) of
	{ok,S} ->
	    Master ! {self(),reader,
		      spawn_link(fun () -> fill_sendq_read(S, Master) end)},
	    Msg = "the quick brown fox jumps over a lazy dog~n",
	    fill_sendq_write(S, Master, [Msg,Msg,Msg,Msg,Msg,Msg,Msg,Msg]);
	Error ->
	    io:format("~p error: ~p.~n", [self(),Error]),
	    Master ! {self(),flush([Error])}
    end.

fill_sendq_write(S, Master, Msg) ->
    %% Server
    %%
    %%io:format("~p sending...~n", [self()]),
    Master ! {self(),send},
    case gen_tcp:send(S, Msg) of
	ok ->
	    %%io:format("~p ok.~n", [self()]),
	    fill_sendq_write(S, Master, Msg);
	E ->
	    Error = flush([E]),
	    io:format("~p error: ~p.~n", [self(),Error]),
	    Master ! {self(),Error}
    end.

fill_sendq_read(S, Master) ->
    %% Reader
    %%
    io:format("~p read infinity...~n", [self()]),
    case gen_tcp:recv(S, 0, infinity) of
	{ok,Data} ->
	    io:format("~p got: ~p.~n", [self(),Data]),
	    fill_sendq_read(S, Master);
	E ->
	    Error = flush([E]),
	    io:format("~p error: ~p.~n", [self(),Error]),
	    Master ! {self(),Error}
    end.

fill_sendq_client(Port, Master) ->
    %% Client
    %%
    spawn_link(fun () ->
		       %% Just close on order
		       {ok,S} = gen_tcp:connect(
				  "localhost", Port,
				  [{active,false},binary,{packet,0}]),
		       receive
			   {Master,close} ->
			       ok = gen_tcp:close(S)
		       end
	       end).

%%% Try to receive more than available number of bytes from 
%%% a closed socket.
%%%
partial_recv_and_close(Config) when is_list(Config) ->
    ?line Msg = "the quick brown fox jumps over a lazy dog 0123456789\n",
    ?line Len = length(Msg),
    ?line {ok,L} = gen_tcp:listen(0, [{active,false}]),
    ?line {ok,P} = inet:port(L),
    ?line {ok,S} = gen_tcp:connect("localhost", P, [{active,false}]),
    ?line {ok,A} = gen_tcp:accept(L),
    ?line ok = gen_tcp:send(S, Msg),
    ?line ok = gen_tcp:close(S),
    ?line {error,closed} = gen_tcp:recv(A, Len+1),
    ok.

%%% Try to receive more than available number of bytes from 
%%% a closed socket, this time waiting in the recv before closing.
%%%
partial_recv_and_close_2(Config) when is_list(Config) ->
    ?line Msg = "the quick brown fox jumps over a lazy dog 0123456789\n",
    ?line Len = length(Msg),
    ?line {ok,L} = gen_tcp:listen(0, [{active,false}]),
    ?line {ok,P} = inet:port(L),
    ?line Server = self(),
    ?line Client = 
	spawn_link(
	  fun () ->
		  receive after 2000 -> ok end,
		  {ok,S} = gen_tcp:connect("localhost", P, [{active,false}]),
		  ?line ok = gen_tcp:send(S, Msg),
		  receive {Server,close} -> ok end,
		  receive after 2000 -> ok end,
		  ?line ok = gen_tcp:close(S)
	  end),
    ?line {ok,A} = gen_tcp:accept(L),
    ?line Client ! {Server,close},
    ?line {error,closed} = gen_tcp:recv(A, Len+1),
    ok.

%%% Here we tests that gen_tcp:recv/2 will return {error,closed} following
%%% a send operation of a huge amount data when the other end closed the socket.
%%%
partial_recv_and_close_3(Config) when is_list(Config) ->
    [do_partial_recv_and_close_3() || _ <- lists:seq(0, 20)],
    ok.

do_partial_recv_and_close_3() ->
    Parent = self(),
    spawn_link(fun() ->
		       {ok,L} = gen_tcp:listen(0, [{active,false}]),
		       {ok,{_,Port}} = inet:sockname(L),
		       Parent ! {port,Port},
		       {ok,S} = gen_tcp:accept(L),
		       gen_tcp:recv(S, 1),
		       gen_tcp:close(S)
	       end),
    receive
	{port,Port} -> ok
    end,
    ?line Much = ones(8*64*1024),
    ?line {ok,S} = gen_tcp:connect(localhost, Port, [{active,false}]),

    %% Send a lot of data (most of it will be queued). The receiver will read one byte
    %% and close the connection. The write operation will fail.
    ?line gen_tcp:send(S, Much),

    %% We should always get {error,closed} here.
    ?line {error,closed} = gen_tcp:recv(S, 0).
    

test_prio_put_get() ->
    Tos = 3 bsl 5,
    ?line {ok,L1} = gen_tcp:listen(0, [{active,false}]),
    ?line ok = inet:setopts(L1,[{priority,3}]),
    ?line ok = inet:setopts(L1,[{tos,Tos}]),
    ?line {ok,[{priority,3},{tos,Tos}]} = inet:getopts(L1,[priority,tos]),
    ?line ok = inet:setopts(L1,[{priority,3}]), % Dont destroy each other
    ?line {ok,[{priority,3},{tos,Tos}]} = inet:getopts(L1,[priority,tos]),
    ?line ok = inet:setopts(L1,[{reuseaddr,true}]), % Dont let others destroy
    ?line {ok,[{priority,3},{tos,Tos}]} = inet:getopts(L1,[priority,tos]),
    ?line gen_tcp:close(L1),
    ok.
test_prio_accept() ->
    ?line {ok,Sock}=gen_tcp:listen(0,[binary,{packet,0},{active,false},
					 {reuseaddr,true},{priority,4}]),
    ?line {ok,Port} = inet:port(Sock),
    ?line {ok,Sock2}=gen_tcp:connect("localhost",Port,[binary,{packet,0},
						       {active,false},
						       {reuseaddr,true},
						       {priority,4}]),
    ?line {ok,Sock3}=gen_tcp:accept(Sock),
    ?line {ok,[{priority,4}]} = inet:getopts(Sock,[priority]),
    ?line {ok,[{priority,4}]} = inet:getopts(Sock2,[priority]),
    ?line {ok,[{priority,4}]} = inet:getopts(Sock3,[priority]),
    ?line gen_tcp:close(Sock),
    ?line gen_tcp:close(Sock2),
    ?line gen_tcp:close(Sock3),
    ok.

test_prio_accept2() ->
    Tos1 = 4 bsl 5,
    Tos2 = 3 bsl 5,
    ?line {ok,Sock}=gen_tcp:listen(0,[binary,{packet,0},{active,false},
					 {reuseaddr,true},{priority,4},
					 {tos,Tos1}]),
    ?line {ok,Port} = inet:port(Sock),
    ?line {ok,Sock2}=gen_tcp:connect("localhost",Port,[binary,{packet,0},
						       {active,false},
						       {reuseaddr,true},
						       {priority,4},
						       {tos,Tos2}]),
    ?line {ok,Sock3}=gen_tcp:accept(Sock),
    ?line {ok,[{priority,4},{tos,Tos1}]} = inet:getopts(Sock,[priority,tos]),
    ?line {ok,[{priority,4},{tos,Tos2}]} = inet:getopts(Sock2,[priority,tos]),
    ?line {ok,[{priority,4},{tos,Tos1}]} = inet:getopts(Sock3,[priority,tos]),
    ?line gen_tcp:close(Sock),
    ?line gen_tcp:close(Sock2),
    ?line gen_tcp:close(Sock3),
    ok.

test_prio_accept3() ->
    Tos1 = 4 bsl 5,
    Tos2 = 3 bsl 5,
    ?line {ok,Sock}=gen_tcp:listen(0,[binary,{packet,0},{active,false},
				      {reuseaddr,true},
				      {tos,Tos1}]),
    ?line {ok,Port} = inet:port(Sock),
    ?line {ok,Sock2}=gen_tcp:connect("localhost",Port,[binary,{packet,0},
						       {active,false},
						       {reuseaddr,true},
						       {tos,Tos2}]),
    ?line {ok,Sock3}=gen_tcp:accept(Sock),
    ?line {ok,[{priority,0},{tos,Tos1}]} = inet:getopts(Sock,[priority,tos]),
    ?line {ok,[{priority,0},{tos,Tos2}]} = inet:getopts(Sock2,[priority,tos]),
    ?line {ok,[{priority,0},{tos,Tos1}]} = inet:getopts(Sock3,[priority,tos]),
    ?line gen_tcp:close(Sock),
    ?line gen_tcp:close(Sock2),
    ?line gen_tcp:close(Sock3),
    ok.
    
test_prio_accept_async() ->
    Tos1 = 4 bsl 5,
    Tos2 = 3 bsl 5,
    Ref = make_ref(),
    ?line spawn(?MODULE,priority_server,[{self(),Ref}]),
    ?line Port = receive 
		     {Ref,P} -> P 
		 after 5000 -> ?t:fail({error,"helper process timeout"}) 
		 end,
    ?line receive
	  after 3000 -> ok
	  end,
    ?line {ok,Sock2}=gen_tcp:connect("localhost",Port,[binary,{packet,0},
						       {active,false},
						       {reuseaddr,true},
						       {priority,4},
						       {tos,Tos2}]),
    ?line receive 
	      {Ref,{ok,[{priority,4},{tos,Tos1}]}} -> 
		  ok ;
	      {Ref,Error} ->
		   ?t:fail({missmatch,Error})
	  after 5000 -> ?t:fail({error,"helper process timeout"}) 
	  end,
    ?line receive 
	      {Ref,{ok,[{priority,4},{tos,Tos1}]}} -> 
		  ok ;
	      {Ref,Error2} ->
		   ?t:fail({missmatch,Error2})
	  after 5000 -> ?t:fail({error,"helper process timeout"}) 
	  end,
    
    ?line {ok,[{priority,4},{tos,Tos2}]} = inet:getopts(Sock2,[priority,tos]),
    ?line catch gen_tcp:close(Sock2),
    ok.

priority_server({Parent,Ref}) ->
    Tos1 = 4 bsl 5,
    ?line {ok,Sock}=gen_tcp:listen(0,[binary,{packet,0},{active,false},
				      {reuseaddr,true},{priority,4},
				      {tos,Tos1}]),
    ?line {ok,Port} = inet:port(Sock),
    Parent ! {Ref,Port},
    ?line {ok,Sock3}=gen_tcp:accept(Sock),
    Parent ! {Ref, inet:getopts(Sock,[priority,tos])},
    Parent ! {Ref, inet:getopts(Sock3,[priority,tos])},
    ok.

test_prio_fail() ->
    ?line {ok,L} = gen_tcp:listen(0, [{active,false}]),
    ?line {error,_} = inet:setopts(L,[{priority,1000}]),
%   This error could only happen in linux kernels earlier than 2.6.24.4
%   Privilege check is now disabled and IP_TOS can never fail (only silently
%   be masked).
%   ?line {error,_} = inet:setopts(L,[{tos,6 bsl 5}]),
    ?line gen_tcp:close(L),
    ok.

test_prio_udp() ->
    Tos = 3 bsl 5,
    ?line {ok,S} = gen_udp:open(0,[{active,false},binary,{tos, Tos}, 
				   {priority,3}]),
    ?line {ok,[{priority,3},{tos,Tos}]} = inet:getopts(S,[priority,tos]),
    ?line gen_udp:close(S),
    ok.

so_priority(doc) ->
    ["Tests the so_priority and ip_tos options on sockets when applicable."];
so_priority(suite) ->
    [];
so_priority(Config) when is_list(Config) ->
    ?line {ok,L} = gen_tcp:listen(0, [{active,false}]),
    ?line ok = inet:setopts(L,[{priority,1}]),
    ?line case inet:getopts(L,[priority]) of
	{ok,[{priority,1}]} ->
	    gen_tcp:close(L),
	    test_prio_put_get(),
	    test_prio_accept(),
	    test_prio_accept2(),
	    test_prio_accept3(),
	    test_prio_accept_async(),
	    test_prio_fail(),
	    test_prio_udp(),
	    ok;
	_ ->
	    case os:type() of
		{unix,linux} ->
		    case os:version() of
			{X,Y,_} when (X > 2) or ((X =:= 2) and (Y >= 4)) ->
			    ?line ?t:fail({error,
					   "so_priority should work on this "
					   "OS, but does not"});
			_ ->
			    {skip, "SO_PRIORITY not suppoorted"}
		    end;
		_ ->
		   {skip, "SO_PRIORITY not suppoorted"}
	    end
    end.

%% Accept test utilities (suites are below)

millis() ->
    {A,B,C}=erlang:now(),
    (A*1000000*1000)+(B*1000)+(C div 1000).
	
collect_accepts(Tmo) ->
    A = millis(),
    receive
	{accepted,P,Msg} ->
	    [{P,Msg}] ++ collect_accepts(Tmo-(millis() - A))
    after Tmo ->
	    []
    end.
   
-define(EXPECT_ACCEPTS(Pattern,Timeout),
	(fun() ->
		 case collect_accepts(Timeout) of
		     Pattern ->
			 ok;
		     Other ->
			 {error,{unexpected,{Other,process_info(self(),messages)}}}
		 end
	 end)()).
	
collect_connects(Tmo) ->
    A = millis(),
    receive
	{connected,P,Msg} ->
	    [{P,Msg}] ++ collect_connects(Tmo-(millis() - A))
    after Tmo ->
	    []
    end.
   
-define(EXPECT_CONNECTS(Pattern,Timeout),
	(fun() ->
		 case collect_connects(Timeout) of
		     Pattern ->
			 ok;
		     Other ->
			 {error,{unexpected,Other}}
		 end
	 end)()).

mktmofun(Tmo,Parent,LS) ->
    fun() -> Parent ! {accepted,self(), catch gen_tcp:accept(LS,Tmo)} end.

%% Accept tests
primitive_accept(suite) ->
    [];
primitive_accept(doc) ->
    ["Test singular accept"];
primitive_accept(Config) when is_list(Config) ->
    ?line {ok,LS}=gen_tcp:listen(0,[]),
    ?line {ok,PortNo}=inet:port(LS),
    ?line Parent = self(),
    ?line F = fun() -> Parent ! {accepted,self(),gen_tcp:accept(LS)} end,
    ?line P = spawn(F),
    ?line gen_tcp:connect("localhost",PortNo,[]),
    ?line receive
	      {accepted,P,{ok,P0}} when is_port(P0) ->
		  ok;
	      {accepted,P,Other0} ->
		  {error,Other0}
	  after 500 ->
		  {error,timeout}
	  end.

	
multi_accept_close_listen(suite) ->
    [];
multi_accept_close_listen(doc) ->
    ["Closing listen socket when multi-accepting"];
multi_accept_close_listen(Config) when is_list(Config) ->
    ?line {ok,LS}=gen_tcp:listen(0,[]),
    ?line Parent = self(),
    ?line F = fun() -> Parent ! {accepted,self(),gen_tcp:accept(LS)} end,
    ?line spawn(F),
    ?line spawn(F),
    ?line spawn(F),
    ?line spawn(F),
    ?line gen_tcp:close(LS),
    ?line ?EXPECT_ACCEPTS([{_,{error,closed}},{_,{error,closed}},
			   {_,{error,closed}},{_,{error,closed}}], 500).
	
accept_timeout(suite) ->
    [];
accept_timeout(doc) ->
    ["Single accept with timeout"];
accept_timeout(Config) when is_list(Config) ->
    ?line {ok,LS}=gen_tcp:listen(0,[]),
    ?line Parent = self(),
    ?line F = fun() -> Parent ! {accepted,self(),gen_tcp:accept(LS,1000)} end,
    ?line P = spawn(F),
    ?line ?EXPECT_ACCEPTS([{P,{error,timeout}}],2000).

accept_timeouts_in_order(suite) ->
    [];
accept_timeouts_in_order(doc) ->
    ["Check that multi-accept timeouts happen in the correct order"];
accept_timeouts_in_order(Config) when is_list(Config) ->
    ?line {ok,LS}=gen_tcp:listen(0,[]),
    ?line Parent = self(),
    ?line P1 = spawn(mktmofun(1000,Parent,LS)),
    ?line P2 = spawn(mktmofun(1200,Parent,LS)),
    ?line P3 = spawn(mktmofun(1300,Parent,LS)),
    ?line P4 = spawn(mktmofun(1400,Parent,LS)),
    ?line ?EXPECT_ACCEPTS([{P1,{error,timeout}},{P2,{error,timeout}},
			   {P3,{error,timeout}},{P4,{error,timeout}}], 2000).

accept_timeouts_in_order2(suite) ->
    [];
accept_timeouts_in_order2(doc) ->
    ["Check that multi-accept timeouts happen in the correct order (more)"];
accept_timeouts_in_order2(Config) when is_list(Config) ->
    ?line {ok,LS}=gen_tcp:listen(0,[]),
    ?line Parent = self(),
    ?line P1 = spawn(mktmofun(1400,Parent,LS)),
    ?line P2 = spawn(mktmofun(1300,Parent,LS)),
    ?line P3 = spawn(mktmofun(1200,Parent,LS)),
    ?line P4 = spawn(mktmofun(1000,Parent,LS)),
    ?line ?EXPECT_ACCEPTS([{P4,{error,timeout}},{P3,{error,timeout}},
			   {P2,{error,timeout}},{P1,{error,timeout}}], 2000).

accept_timeouts_in_order3(suite) ->
    [];
accept_timeouts_in_order3(doc) ->
    ["Check that multi-accept timeouts happen in the correct order (even more)"];
accept_timeouts_in_order3(Config) when is_list(Config) ->
    ?line {ok,LS}=gen_tcp:listen(0,[]),
    ?line Parent = self(),
    ?line P1 = spawn(mktmofun(1200,Parent,LS)),
    ?line P2 = spawn(mktmofun(1400,Parent,LS)),
    ?line P3 = spawn(mktmofun(1300,Parent,LS)),
    ?line P4 = spawn(mktmofun(1000,Parent,LS)),
    ?line ?EXPECT_ACCEPTS([{P4,{error,timeout}},{P1,{error,timeout}},
			   {P3,{error,timeout}},{P2,{error,timeout}}], 2000).

accept_timeouts_mixed(suite) ->
    [];
accept_timeouts_mixed(doc) ->
    ["Check that multi-accept timeouts behave correctly when mixed with successful timeouts"];
accept_timeouts_mixed(Config) when is_list(Config) ->
    ?line {ok,LS}=gen_tcp:listen(0,[]),
    ?line Parent = self(),
    ?line {ok,PortNo}=inet:port(LS),
    ?line P1 = spawn(mktmofun(1000,Parent,LS)),
    ?line wait_until_accepting(P1,500),
    ?line P2 = spawn(mktmofun(2000,Parent,LS)),
    ?line wait_until_accepting(P2,500),
    ?line P3 = spawn(mktmofun(3000,Parent,LS)),
    ?line wait_until_accepting(P3,500),
    ?line P4 = spawn(mktmofun(4000,Parent,LS)),
    ?line wait_until_accepting(P4,500),
    ?line ok = ?EXPECT_ACCEPTS([{P1,{error,timeout}}],1500),
    ?line {ok,_}=gen_tcp:connect("localhost",PortNo,[]),
    ?line ok = ?EXPECT_ACCEPTS([{P2,{ok,Port0}}] when is_port(Port0),100),
    ?line ok = ?EXPECT_ACCEPTS([{P3,{error,timeout}}],2000),	
    ?line gen_tcp:connect("localhost",PortNo,[]),
    ?line ?EXPECT_ACCEPTS([{P4,{ok,Port1}}] when is_port(Port1),100).

killing_acceptor(suite) ->
    [];
killing_acceptor(doc) ->
    ["Check that single acceptor behaves as expected when killed"];
killing_acceptor(Config) when is_list(Config) ->    
    ?line {ok,LS}=gen_tcp:listen(0,[]), 
    ?line Pid = spawn(fun() -> erlang:display({accepted,self(),gen_tcp:accept(LS)}) end),
    ?line receive after 100 ->
			  ok
		  end,
    ?line {ok,L1} = prim_inet:getstatus(LS),
    ?line true = lists:member(accepting, L1),
    ?line exit(Pid,kill),
    ?line receive after 100 ->
			  ok
		  end,
    ?line {ok,L2} = prim_inet:getstatus(LS),
    ?line false  = lists:member(accepting, L2),
    ok.

killing_multi_acceptors(suite) ->
    [];
killing_multi_acceptors(doc) ->
    ["Check that multi acceptors behaves as expected when killed"];
killing_multi_acceptors(Config) when is_list(Config) ->    
    ?line {ok,LS}=gen_tcp:listen(0,[]), 
    ?line Parent = self(),
    ?line F = fun() -> Parent ! {accepted,self(),gen_tcp:accept(LS)} end,
    ?line F2 = mktmofun(1000,Parent,LS),
    ?line Pid = spawn(F),
    ?line Pid2 = spawn(F2),
    ?line receive after 100 ->
		    ok
	    end,
    ?line {ok,L1} = prim_inet:getstatus(LS),
    ?line true = lists:member(accepting, L1),
    ?line exit(Pid,kill),
    ?line receive after 100 ->
		    ok
	    end,
    ?line {ok,L2} = prim_inet:getstatus(LS),
    ?line true  = lists:member(accepting, L2),
    ?line ok = ?EXPECT_ACCEPTS([{Pid2,{error,timeout}}],1000),
    ?line {ok,L3} = prim_inet:getstatus(LS),
    ?line false  = lists:member(accepting, L3),
    ok.

killing_multi_acceptors2(suite) ->
    [];
killing_multi_acceptors2(doc) ->
    ["Check that multi acceptors behaves as expected when killed (more)"];
killing_multi_acceptors2(Config) when is_list(Config) ->
    ?line {ok,LS}=gen_tcp:listen(0,[]), 
    ?line Parent = self(),
    ?line {ok,PortNo}=inet:port(LS),
    ?line F = fun() -> Parent ! {accepted,self(),gen_tcp:accept(LS)} end,
    ?line F2 = mktmofun(1000,Parent,LS),
    ?line Pid = spawn(F),
    ?line Pid2 = spawn(F),
    ?line receive after 100 ->
		    ok
	    end,
    ?line {ok,L1} = prim_inet:getstatus(LS),
    ?line true = lists:member(accepting, L1),
    ?line exit(Pid,kill),
    ?line receive after 100 ->
		    ok
	    end,
    ?line {ok,L2} = prim_inet:getstatus(LS),
    ?line true  = lists:member(accepting, L2),
    ?line exit(Pid2,kill),
    ?line receive after 100 ->
		    ok
	    end,
    ?line {ok,L3} = prim_inet:getstatus(LS),
    ?line false  = lists:member(accepting, L3),
    ?line Pid3 = spawn(F2),
    ?line receive after 100 ->
		    ok
	    end,
    ?line {ok,L4} = prim_inet:getstatus(LS),
    ?line true  = lists:member(accepting, L4),
    ?line gen_tcp:connect("localhost",PortNo,[]),
    ?line ok = ?EXPECT_ACCEPTS([{Pid3,{ok,Port}}] when is_port(Port),100),
    ?line {ok,L5} = prim_inet:getstatus(LS),
    ?line false  = lists:member(accepting, L5),
    ok.
    
several_accepts_in_one_go(suite) ->
    [];
several_accepts_in_one_go(doc) ->
    ["checks that multi-accept works when more than one accept can be "
     "done at once (wb test of inet_driver)"];
several_accepts_in_one_go(Config) when is_list(Config) ->
    ?line {ok,LS}=gen_tcp:listen(0,[]), 
    ?line Parent = self(),
    ?line {ok,PortNo}=inet:port(LS),
    ?line F1 = fun() -> Parent ! {accepted,self(),gen_tcp:accept(LS)} end,
    ?line F2 = fun() -> Parent ! {connected,self(),gen_tcp:connect("localhost",PortNo,[])} end,
    ?line spawn(F1),
    ?line spawn(F1),
    ?line spawn(F1),
    ?line spawn(F1),
    ?line spawn(F1),
    ?line spawn(F1),
    ?line spawn(F1),
    ?line spawn(F1),
    ?line ok = ?EXPECT_ACCEPTS([],500),
    ?line spawn(F2),
    ?line spawn(F2),
    ?line spawn(F2),
    ?line spawn(F2),
    ?line spawn(F2),
    ?line spawn(F2),
    ?line spawn(F2),
    ?line spawn(F2),
    ?line ok = ?EXPECT_ACCEPTS([{_,{ok,_}},{_,{ok,_}},{_,{ok,_}},{_,{ok,_}},{_,{ok,_}},{_,{ok,_}},{_,{ok,_}},{_,{ok,_}}],15000),
    ?line ok = ?EXPECT_CONNECTS([{_,{ok,_}},{_,{ok,_}},{_,{ok,_}},{_,{ok,_}},{_,{ok,_}},{_,{ok,_}},{_,{ok,_}},{_,{ok,_}}],1000),
    ok.


flush(Msgs) ->
    erlang:yield(),
    receive Msg -> flush([Msg|Msgs])
    after     0 -> lists:reverse(Msgs)
    end.

wait_until_accepting(Proc,0) ->
    exit({timeout_waiting_for_accepting,Proc});
wait_until_accepting(Proc,N) ->
    case process_info(Proc,current_function) of
        {current_function,{prim_inet,accept0,2}} ->
            case process_info(Proc,status) of
                {status,waiting} -> 
                    ok;
                _O1 ->
                    receive 
                    after 5 ->
                        wait_until_accepting(Proc,N-1)
                    end
            end;
         _O2 ->
            receive 
            after 5 ->
                wait_until_accepting(Proc,N-1)
            end
    end.


accept_system_limit(suite) ->
    [];
accept_system_limit(doc) ->
    ["Check that accept returns {error, system_limit} "
     "(and not {error, enfile}) when running out of ports"];
accept_system_limit(Config) when is_list(Config) ->
    ?line {ok, LS} = gen_tcp:listen(0, []),
    ?line {ok, TcpPort} = inet:port(LS),
    Me = self(),
    ?line Connector = spawn_link(fun () -> connector(TcpPort, Me) end),
    receive {Connector, sync} -> Connector ! {self(), continue} end,
    ?line ok = acceptor(LS, false, []),
    ?line Connector ! stop,
    ok.

acceptor(LS, GotSL, A) ->
    case gen_tcp:accept(LS, 1000) of
	{ok, S} ->
	    acceptor(LS, GotSL, [S|A]);
	{error, system_limit} ->
	    acceptor(LS, true, A);
	{error, timeout} when GotSL ->
	    ok;
	{error, timeout} ->
	    error
    end.

connector(TcpPort, Tester) ->
    ManyPorts = open_ports([]),
    Tester ! {self(), sync},
    receive {Tester, continue} -> timer:sleep(100) end,
    ConnF = fun (Port) ->
		    case catch gen_tcp:connect({127,0,0,1}, TcpPort, []) of
			{ok, Sock} ->
			    Sock;
			_Error ->
			    port_close(Port)
		    end
	    end,
    R = [ConnF(Port) || Port <- lists:sublist(ManyPorts, 10)],
    receive stop -> R end.

open_ports(L) ->
    case catch open_port({spawn_driver, "ram_file_drv"}, []) of
	Port when is_port(Port) ->
	    open_ports([Port|L]);
	{'EXIT', {system_limit, _}} ->
	    {L1, L2} = lists:split(5, L),
	    [port_close(Port) || Port <- L1],
	    L2
    end.


active_once_closed(suite) ->
    [];
active_once_closed(doc) ->
    ["Check that active once and tcp_close messages behave as expected"];
active_once_closed(Config) when is_list(Config) ->
    (fun() ->
	     ?line {Loop,A} = setup_closed_ao(),
	     ?line Loop({{error,closed},{error,econnaborted}}, 
			fun() -> gen_tcp:send(A,"Hello") end),
	     ?line ok = inet:setopts(A,[{active,once}]),
	     ?line ok = receive {tcp_closed, A} -> ok after 1000 -> error end,
	     ?line {error,einval} = inet:setopts(A,[{active,once}]),
	     ?line ok = receive {tcp_closed, A} -> error after 1000 -> ok end
     end)(),
    (fun() ->
	     ?line {Loop,A} = setup_closed_ao(),
	     ?line Loop({{error,closed},{error,econnaborted}}, 
			fun() -> gen_tcp:send(A,"Hello") end),
	     ?line ok = inet:setopts(A,[{active,true}]),
	     ?line ok = receive {tcp_closed, A} -> ok after 1000 -> error end,
	     ?line {error,einval} = inet:setopts(A,[{active,true}]),
	     ?line ok = receive {tcp_closed, A} -> error after 1000 -> ok end
     end)(),
     (fun() ->
	     ?line {Loop,A} = setup_closed_ao(),
	     ?line Loop({{error,closed},{error,econnaborted}}, 
			fun() -> gen_tcp:send(A,"Hello") end),
	     ?line ok = inet:setopts(A,[{active,true}]),
	     ?line ok = receive {tcp_closed, A} -> ok after 1000 -> error end,
	     ?line {error,einval} = inet:setopts(A,[{active,once}]),
	     ?line ok = receive {tcp_closed, A} -> error after 1000 -> ok end
     end)(),
    (fun() ->
	     ?line {Loop,A} = setup_closed_ao(),
	     ?line Loop({{error,closed},{error,econnaborted}}, 
			fun() -> gen_tcp:send(A,"Hello") end),
	     ?line ok = inet:setopts(A,[{active,once}]),
	     ?line ok = receive {tcp_closed, A} -> ok after 1000 -> error end,
	     ?line {error,einval} = inet:setopts(A,[{active,true}]),
	     ?line ok = receive {tcp_closed, A} -> error after 1000 -> ok end
     end)(),
    (fun() ->
	     ?line {Loop,A} = setup_closed_ao(),
	     ?line Loop({{error,closed},{error,econnaborted}}, 
			fun() -> gen_tcp:send(A,"Hello") end),
	     ?line ok = inet:setopts(A,[{active,false}]),
	     ?line ok = receive {tcp_closed, A} -> error after 1000 -> ok end,
	     ?line ok = inet:setopts(A,[{active,once}]),
	     ?line ok = receive {tcp_closed, A} -> ok after 1000 -> error end
     end)().
   
send_timeout(suite) ->
    [];
send_timeout(doc) ->
    ["Test the send_timeout socket option"];
send_timeout(Config) when is_list(Config) ->
    %% Basic
    BasicFun = 
	fun(AutoClose) ->
	     ?line {Loop,A,RNode} = setup_timeout_sink(1000, AutoClose),
	     ?line {error,timeout} = 
		 Loop(fun() ->
			      Res = gen_tcp:send(A,<<1:10000>>),
			      %%erlang:display(Res),
			      Res
		      end),
	     %% Check that the socket is not busy/closed...
	     Error = after_send_timeout(AutoClose),
	     ?line {error,Error} = gen_tcp:send(A,<<"Hej">>),
	     ?line test_server:stop_node(RNode)
	end,
    BasicFun(false),
    BasicFun(true),
    %% Check timeout length
   ?line  Self = self(),
   ?line  Pid = 
	spawn(fun() ->
		      {Loop,A,RNode} = setup_timeout_sink(1000, true),
		      {error,timeout} = 
			  Loop(fun() ->
				       Res = gen_tcp:send(A,<<1:10000>>),
				       %%erlang:display(Res),
				       Self ! Res,
				       Res
			       end),
		      test_server:stop_node(RNode)
	      end),		  
    ?line Diff = get_max_diff(),
    ?line io:format("Max time for send: ~p~n",[Diff]),
    ?line true = (Diff > 500) and (Diff < 1500),
    %% Let test_server slave die...
    ?line Mon = erlang:monitor(process, Pid),
    ?line receive {'DOWN',Mon,process,Pid,_} -> ok end,
    %% Check that parallell writers do not hang forever
    ParaFun = 
	fun(AutoClose) ->
		?line {Loop,A,RNode} = setup_timeout_sink(1000, AutoClose),
		SenderFun = fun() ->
				    {error,Error} = 
					Loop(fun() ->
						     gen_tcp:send(A, <<1:10000>>)
					     end),
				    Self ! {error,Error}
			    end,
		?line spawn_link(SenderFun),
		?line spawn_link(SenderFun),
		?line receive 
			  {error,timeout} -> ok
		      after 10000 ->
			      ?line exit(timeout)
		      end,
		NextErr = after_send_timeout(AutoClose),
		?line receive
			  {error,NextErr} -> ok
		      after 10000 ->
			      ?line exit(timeout)
		      end,
		?line {error,NextErr} = gen_tcp:send(A,<<"Hej">>),
		?line test_server:stop_node(RNode)
	end,
    ParaFun(false),
    ParaFun(true),
    ok.
mad_sender(S) ->
    {_, _, USec} = now(),
    case gen_tcp:send(S, integer_to_list(USec)) of
        ok ->
            mad_sender(S);
        Err ->
            Err
    end.


flush() ->
    receive
	_X ->
	    %erlang:display(_X),
	    flush()
    after 0 ->
	    ok
    end.

send_timeout_active(suite) ->
    [];
send_timeout_active(doc) ->
    ["Test the send_timeout socket option for active sockets"];
send_timeout_active(Config) when is_list(Config) ->
    Dog = test_server:timetrap(test_server:seconds(20)),
    %% Basic
    BasicFun = 
	fun(AutoClose) ->
		?line {Loop,A,RNode,C} = setup_active_timeout_sink(1, AutoClose),
		inet:setopts(A, [{active, once}]),
		?line Mad = spawn_link(RNode,fun() -> mad_sender(C) end),
		?line {error,timeout} = 
		    Loop(fun() ->
				 receive
				     {tcp, _Sock, _Data} ->
					 inet:setopts(A, [{active, once}]),
					 Res = gen_tcp:send(A,lists:duplicate(1000, $a)),
					 %erlang:display(Res),
					 Res;
				     Err ->
					 io:format("sock closed: ~p~n", [Err]),
					 Err
				 end
			 end),
		unlink(Mad),
		exit(Mad,kill),
		?line test_server:stop_node(RNode)
	end,
    BasicFun(false),
    flush(),
    BasicFun(true),
    flush(),
    test_server:timetrap_cancel(Dog),
    ok.

after_send_timeout(AutoClose) ->
    case AutoClose of
	true -> enotconn;
	false -> timeout
    end.

get_max_diff() ->
    receive
	ok ->
	    get_max_diff(0)
    after 10000 ->
	    exit(timeout)
    end.

get_max_diff(Max) ->
    T1 = millistamp(),
    receive
	ok ->
	    Diff = millistamp() - T1,
	    if
		Diff > Max ->
		    get_max_diff(Diff);
		true ->
		    get_max_diff(Max)
	    end;
	{error,timeout} ->
	    Diff = millistamp() - T1,
	    if
		Diff > Max ->
		    Diff;
		true ->
		    Max
	    end
    after 10000 ->
	    exit(timeout)
    end.
	    
setup_closed_ao() ->
    Dir = filename:dirname(code:which(?MODULE)),
    {ok,R} = test_server:start_node(test_default_options_slave,slave,
				       [{args,"-pa " ++ Dir}]),    
    Host = list_to_atom(lists:nth(2,string:tokens(atom_to_list(node()),"@"))),
    {ok, L} = gen_tcp:listen(0, [{active,false},{packet,2}]),
    Fun = fun(F) -> 
		  receive 
		      {From,X} when is_function(X) -> 
			  From ! {self(),X()}, F(F); 
		      die -> ok 
		  end 
	  end, 
    Pid =  rpc:call(R,erlang,spawn,[fun() -> Fun(Fun) end]),
    {ok, Port} = inet:port(L),
    Remote = fun(Fu) -> 
		     Pid ! {self(), Fu}, 
		     receive {Pid,X} -> X 
		     end 
	     end,
    {ok, C} = Remote(fun() -> 
			     gen_tcp:connect(Host,Port,
					     [{active,false},{packet,2}]) 
		     end),
    {ok,A} = gen_tcp:accept(L),
    gen_tcp:send(A,"Hello"),
    {ok, "Hello"} = Remote(fun() -> gen_tcp:recv(C,0) end),
    ok =  Remote(fun() -> gen_tcp:close(C) end), 
    Loop2 = fun(_,_,_,0) -> 
		    {failure, timeout}; 
	       (L2,{MA,MB},F2,N) -> 
		    case F2() of 
			MA -> MA; 
			MB -> MB; 
			Other -> io:format("~p~n",[Other]), 
				 receive after 1000 -> ok end, 
				 L2(L2,{MA,MB},F2,N-1) 
		    end 
	    end,
    Loop = fun(Match2,F3) ->  Loop2(Loop2,Match2,F3,10) end,
    test_server:stop_node(R),
    {Loop,A}.
    
setup_timeout_sink(Timeout, AutoClose) ->
    ?line Dir = filename:dirname(code:which(?MODULE)),
    ?line {ok,R} = test_server:start_node(test_default_options_slave,slave,
				       [{args,"-pa " ++ Dir}]),    
    ?line Host = list_to_atom(lists:nth(2,string:tokens(atom_to_list(node()),"@"))),
    ?line {ok, L} = gen_tcp:listen(0, [{active,false},{packet,2},
				 {send_timeout,Timeout},
				 {send_timeout_close,AutoClose}]),
    ?line Fun = fun(F) -> 
		  receive 
		      {From,X} when is_function(X) -> 
			  From ! {self(),X()}, F(F); 
		      die -> ok 
		  end 
	  end, 
    ?line Pid =  rpc:call(R,erlang,spawn,[fun() -> Fun(Fun) end]),
    ?line {ok, Port} = inet:port(L),
    ?line Remote = fun(Fu) -> 
		     Pid ! {self(), Fu}, 
		     receive {Pid,X} -> X 
		     end 
	     end,
    ?line {ok, C} = Remote(fun() -> 
			     gen_tcp:connect(Host,Port,
					     [{active,false},{packet,2}]) 
		     end),
    ?line {ok,A} = gen_tcp:accept(L),
    ?line gen_tcp:send(A,"Hello"),
    ?line {ok, "Hello"} = Remote(fun() -> gen_tcp:recv(C,0) end),
    ?line Loop2 = fun(_,_,0) -> 
		    {failure, timeout}; 
	       (L2,F2,N) -> 
		    Ret = F2(),
		    io:format("~p~n",[Ret]),
		    case Ret of
			ok -> receive after 1 -> ok end, 
			      L2(L2,F2,N-1);
			Other -> Other
		    end 
	    end,
    ?line Loop = fun(F3) ->  Loop2(Loop2,F3,1000) end,
    {Loop,A,R}.

setup_active_timeout_sink(Timeout, AutoClose) ->
    ?line Dir = filename:dirname(code:which(?MODULE)),
    ?line {ok,R} = test_server:start_node(test_default_options_slave,slave,
				       [{args,"-pa " ++ Dir}]),    
    ?line Host = list_to_atom(lists:nth(2,string:tokens(atom_to_list(node()),"@"))),
    ?line {ok, L} = gen_tcp:listen(0, [binary,{active,false},{packet,0},{nodelay, true},{keepalive, true},
				 {send_timeout,Timeout},
				 {send_timeout_close,AutoClose}]),
    ?line Fun = fun(F) -> 
		  receive 
		      {From,X} when is_function(X) -> 
			  From ! {self(),X()}, F(F); 
		      die -> ok 
		  end 
	  end, 
    ?line Pid =  rpc:call(R,erlang,spawn,[fun() -> Fun(Fun) end]),
    ?line {ok, Port} = inet:port(L),
    ?line Remote = fun(Fu) -> 
		     Pid ! {self(), Fu}, 
		     receive {Pid,X} -> X 
		     end 
	     end,
    ?line {ok, C} = Remote(fun() -> 
			     gen_tcp:connect(Host,Port,
					     [{active,false}]) 
		     end),
    ?line {ok,A} = gen_tcp:accept(L),
    ?line gen_tcp:send(A,"Hello"),
    ?line {ok, "H"++_} = Remote(fun() -> gen_tcp:recv(C,0) end),
    ?line Loop2 = fun(_,_,0) -> 
		    {failure, timeout}; 
	       (L2,F2,N) -> 
		    Ret = F2(),
		    io:format("~p~n",[Ret]),
		    case Ret of
			ok -> receive after 1 -> ok end, 
			      L2(L2,F2,N-1);
			Other -> Other
		    end 
	    end,
    ?line Loop = fun(F3) ->  Loop2(Loop2,F3,1000) end,
    {Loop,A,R,C}.

     
millistamp() ->
    {Mega, Secs, Micros} = erlang:now(),
    (Micros div 1000) + Secs * 1000 + Mega * 1000000000.

has_superfluous_schedulers() ->
    case {erlang:system_info(schedulers),
	  erlang:system_info(logical_processors)} of
	{S, unknown} when S > 1 -> true;
	{S, P} when S > P -> true;
	_ -> false
    end.


otp_7731(suite) -> [];    
otp_7731(doc) -> 
    "Leaking message from inet_drv {inet_reply,P,ok} "
    "when a socket sending resumes working after a send_timeout";
otp_7731(Config) when is_list(Config) ->
    ?line ServerPid = spawn_link(?MODULE, otp_7731_server, [self()]),
    ?line receive {ServerPid, ready, PortNum} -> ok end,

    ?line {ok, Socket} = gen_tcp:connect("localhost", PortNum, 
					 [binary, {active, false}, {packet, raw},
					  {send_timeout, 1000}]),
    otp_7731_send(Socket),
    io:format("Sending complete...\n",[]),
    ServerPid ! {self(), recv},
    receive {ServerPid, ok} -> ok end,	    
    
    io:format("Client waiting for leaking messages...\n",[]),

    %% Now make sure inet_drv does not leak any internal messages.
    receive Msg ->
	    ?line test_server:fail({unexpected, Msg})
    after 1000 ->
	    ok
    end,
    io:format("No leaking messages. Done.\n",[]),
    gen_tcp:close(Socket).
    
otp_7731_send(Socket) ->
    Bin = <<1:10000>>,
    io:format("Client sending ~p bytes...\n",[size(Bin)]),
    ?line case gen_tcp:send(Socket, Bin) of
	      ok -> otp_7731_send(Socket);
	      {error,timeout} -> ok
	  end.

otp_7731_server(ClientPid) ->
    ?line {ok, LSocket} = gen_tcp:listen(0, [binary, {packet, raw}, 
					     {active, false}]),
    ?line {ok, {_, PortNum}} = inet:sockname(LSocket),
    io:format("Listening on ~w with port number ~p\n", [LSocket, PortNum]),
    ClientPid ! {self(), ready, PortNum},

    {ok, CSocket} = gen_tcp:accept(LSocket),
    gen_tcp:close(LSocket),

    io:format("Server got connection, wait for recv order...\n",[]),

    receive {ClientPid, recv} -> ok end,
    
    io:format("Server start receiving...\n",[]),

    otp_7731_recv(CSocket),

    ClientPid ! {self(), ok},

    io:format("Server finished, closing...\n",[]),
    gen_tcp:close(CSocket).


otp_7731_recv(Socket) ->
    ?line case gen_tcp:recv(Socket, 0, 1000) of
	      {ok, Bin} -> 
		  io:format("Server received ~p bytes\n",[size(Bin)]),
		  otp_7731_recv(Socket);
	      {error,timeout} ->
		  io:format("Server got receive timeout\n",[]),
		  ok
	  end.


%% OTP-7615: TCP-ports hanging in CLOSING state when sending large
%% buffer followed by a recv() that returns error due to closed
%% connection.
zombie_sockets(suite) -> [];
zombie_sockets(doc) -> ["OTP-7615 Leaking closed ports."];
zombie_sockets(Config) when is_list(Config) ->
    register(zombie_collector,self()),
    Calls = 10,
    Server = spawn_link(?MODULE, zombie_server,[self(), Calls]),
    ?line {Server, ready, PortNum} = receive Msg -> Msg  end,
    io:format("Ports before = ~p\n",[lists:sort(erlang:ports())]),
    zombie_client_loop(Calls, PortNum),
    Ports = lists:sort(zombie_collector(Calls,[])),
    Server ! terminate,
    io:format("Collected ports = ~p\n",[Ports]),
    ?line [] = zombies_alive(Ports, 10),
    timer:sleep(1000),
    ok.

zombie_client_loop(0, _) -> ok;
zombie_client_loop(N, PortNum) when is_integer(PortNum) ->
    ?line {ok, Socket} = gen_tcp:connect("localhost", PortNum, 
					 [binary, {active, false}, {packet, raw}]),
    ?line gen_tcp:close(Socket), % to make server recv fail
    zombie_client_loop(N-1, PortNum).


zombie_collector(0,Acc) ->
    Acc;
zombie_collector(N,Acc) ->
    receive 
	{closed, Socket} -> 
	    zombie_collector(N-1,[Socket|Acc]);
	E -> 
	    {unexpected, E, Acc}
    end.
	    
zombies_alive(Ports, WaitSec) ->
    Alive = lists:sort(erlang:ports()),
    io:format("Alive = ~p\n",[Alive]),
    Zombies = lists:filter(fun(P) -> lists:member(P, Alive) end, Ports),
    case Zombies of
	[] -> [];
	_ ->
	    case WaitSec of
		0 -> Zombies;
		_ -> timer:sleep(1000), % Wait some more for zombies to die
		     zombies_alive(Zombies, WaitSec-1)
	    end
    end.

zombie_server(Pid, Calls) ->
    ?line {ok, LSocket} = gen_tcp:listen(0, [binary, {packet, raw}, 
					     {active, false}, {backlog, Calls}]),
    ?line {ok, {_, PortNum}} = inet:sockname(LSocket),
    io:format("Listening on ~w with port number ~p\n", [LSocket, PortNum]),
    BigBin = list_to_binary(lists:duplicate(100*1024, 77)),
    Pid ! {self(), ready, PortNum},
    zombie_accept_loop(LSocket, BigBin, Calls),
    ?line terminate = receive Msg -> Msg end.	    

zombie_accept_loop(_, _, 0) ->
    ok;
zombie_accept_loop(Socket, BigBin, Calls) ->
    ?line case gen_tcp:accept(Socket) of
	{ok, NewSocket} ->
	    spawn_link(fun() -> zombie_serve_client(NewSocket, BigBin) end),
	    zombie_accept_loop(Socket, BigBin, Calls-1);
	E ->
	    E
    end.

zombie_serve_client(Socket, Bin) ->
    %%io:format("Got connection on ~p\n",[Socket]),
    ?line gen_tcp:send(Socket, Bin),
    %%io:format("Sent data, waiting for reply on ~p\n",[Socket]),
    ?line case gen_tcp:recv(Socket, 4) of
	      {error,closed} -> ok;
	      {error,econnaborted} -> ok % may be returned on Windows
	  end,
    %%io:format("Closing ~p\n",[Socket]),
    ?line gen_tcp:close(Socket),
    zombie_collector ! {closed, Socket}.



otp_7816(suite) -> [];    
otp_7816(doc) -> 
    "Hanging send on windows when sending iolist with more than 16 binaries.";
otp_7816(Config) when is_list(Config) ->
    Client = self(),
    ?line Server = spawn_link(fun()-> otp_7816_server(Client) end),
    ?line receive {Server, ready, PortNum} -> ok end,

    ?line {ok, Socket} = gen_tcp:connect("localhost", PortNum, 
					 [binary, {active, false}, {packet, 4},
					  {send_timeout, 10}]),
    %% We use the undocumented feature that sending can be resumed after
    %% a send_timeout without any data loss if the peer starts to receive data.
    %% Unless of course the 7816-bug is in affect, in which case the write event
    %% for the socket is lost on windows and not all data is sent.

    [otp_7816_send(Socket,18,BinSize,Server) || BinSize <- lists:seq(1000, 2000, 123)],

    io:format("Sending complete...\n",[]),

    ?line ok = gen_tcp:close(Socket),
    Server ! {self(), closed},
    ?line {Server, closed} = receive M -> M end.

    
otp_7816_send(Socket, BinNr, BinSize, Server) ->
    Data = lists:duplicate(BinNr, <<1:(BinSize*8)>>),
    SentBytes = otp_7816_send_data(Socket, Data, 0) * BinNr * BinSize,
    io:format("Client sent ~p bytes...\n",[SentBytes]),
    Server ! {self(),recv,SentBytes},
    ?line {Server, ok} = receive M -> M end.

    

otp_7816_send_data(Socket, Data, Loops) ->
    io:format("Client sending data...\n",[]),
    case gen_tcp:send(Socket, Data) of
	ok ->
	    otp_7816_send_data(Socket,Data, Loops+1);
	{error,timeout} ->
	    Loops+1
    end.
    
    
otp_7816_server(Client) ->
    ?line {ok, LSocket} = gen_tcp:listen(0, [binary, {packet, 4},
					     {active, false}]),
    ?line {ok, {_, PortNum}} = inet:sockname(LSocket),
    io:format("Listening on ~w with port number ~p\n", [LSocket, PortNum]),
    Client ! {self(), ready, PortNum},

    ?line {ok, CSocket} = gen_tcp:accept(LSocket),
    io:format("Server got connection...\n",[]),
    ?line gen_tcp:close(LSocket),

    otp_7816_server_loop(CSocket),

    io:format("Server terminating.\n",[]).


otp_7816_server_loop(CSocket) ->
    io:format("Server waiting for order...\n",[]),

    receive 
	{Client, recv, RecvBytes} -> 
	    io:format("Server start receiving...\n",[]),

	    ?line ok = otp_7816_recv(CSocket, RecvBytes),
	    
	    Client ! {self(), ok},
	    otp_7816_server_loop(CSocket);
	
	{Client, closed} ->
	    ?line {error, closed} = gen_tcp:recv(CSocket, 0, 1000),
	    Client ! {self(), closed}
    end.


otp_7816_recv(_, 0) ->
    io:format("Server got all.\n",[]),
    ok;
otp_7816_recv(CSocket, BytesLeft) ->
    ?line case gen_tcp:recv(CSocket, 0, 1000) of
	      {ok, Bin} when byte_size(Bin) =< BytesLeft -> 
		  io:format("Server received ~p of ~p bytes.\n",[size(Bin), BytesLeft]),
		  otp_7816_recv(CSocket, BytesLeft - byte_size(Bin));
	      {error,timeout} ->
		  io:format("Server got receive timeout when expecting more data\n",[]),
		  error
	  end.

otp_8102(doc) -> ["Receive a packet with a faulty packet header"];
otp_8102(suite) -> [];
otp_8102(Config) when is_list(Config) ->
    ?line {ok, LSocket} = gen_tcp:listen(0, []),
    ?line {ok, {_, PortNum}} = inet:sockname(LSocket),
    io:format("Listening on ~w with port number ~p\n", [LSocket, PortNum]),

    [otp_8102_do(LSocket, PortNum, otp_8102_packet(Type,Size))
     || Size <- lists:seq(-10,-1), 
	Type <- [4, {cdr,big}, {cdr,little}]],
    
    gen_tcp:close(LSocket),
    ok.

otp_8102_packet(4, Size) ->
    {<<Size:32/big>>, 4};
otp_8102_packet({cdr,big}, Size) ->
    {<<"GIOP",0,0,0,0,Size:32/big>>, cdr};
otp_8102_packet({cdr,little}, Size) ->
    {<<"GIOP",0,0,1,0,Size:32/little>>, cdr}.

otp_8102_do(LSocket, PortNum, {Bin,PType}) ->

    io:format("Connect with packet option ~p ...\n",[PType]),
    ?line {ok, RSocket} = gen_tcp:connect("localhost", PortNum, [binary,
								 {packet,PType},
								 {active,true}]),
    ?line {ok, SSocket} = gen_tcp:accept(LSocket),

    io:format("Got connection, sending ~p...\n",[Bin]),

    ?line ok = gen_tcp:send(SSocket, Bin),

    io:format("Sending complete...\n",[]),

    ?line {tcp_error,RSocket,emsgsize} = receive M -> M end,

    io:format("Got error msg, ok.\n",[]),
    gen_tcp:close(SSocket),    
    gen_tcp:close(RSocket).

otp_9389(doc) -> ["Verify packet_size handles long HTTP header lines"];
otp_9389(suite) -> [];
otp_9389(Config) when is_list(Config) ->
    ?line {ok, LS} = gen_tcp:listen(0, [{active,false}]),
    ?line {ok, {_, PortNum}} = inet:sockname(LS),
    io:format("Listening on ~w with port number ~p\n", [LS, PortNum]),
    OrigLinkHdr = "/" ++ string:chars($S, 8192),
    _Server = spawn_link(
                fun() ->
                        ?line {ok, S} = gen_tcp:accept(LS),
                        ?line ok = inet:setopts(S, [{packet_size, 16384}]),
                        ?line ok = otp_9389_loop(S, OrigLinkHdr),
                        ?line ok = gen_tcp:close(S)
                end),
    ?line {ok, S} = gen_tcp:connect("localhost", PortNum,
                                    [binary, {active, false}]),
    Req = "GET / HTTP/1.1\r\n"
        ++ "Host: localhost\r\n"
        ++ "Link: " ++ OrigLinkHdr ++ "\r\n\r\n",
    ?line ok = gen_tcp:send(S, Req),
    ?line ok = inet:setopts(S, [{packet, http}]),
    ?line {ok, {http_response, {1,1}, 200, "OK"}} = gen_tcp:recv(S, 0),
    ?line ok = inet:setopts(S, [{packet, httph}, {packet_size, 16384}]),
    ?line {ok, {http_header, _, 'Content-Length', _, "0"}} = gen_tcp:recv(S, 0),
    ?line {ok, {http_header, _, "Link", _, LinkHdr}} = gen_tcp:recv(S, 0),
    ?line true = (LinkHdr == OrigLinkHdr),
    ok = gen_tcp:close(S),
    ok = gen_tcp:close(LS),
    ok.

otp_9389_loop(S, OrigLinkHdr) ->
    ?line ok = inet:setopts(S, [{active,once},{packet,http}]),
    receive
        {http, S, {http_request, 'GET', _, _}} ->
            ?line ok = otp_9389_loop(S, OrigLinkHdr, undefined)
    after
        3000 ->
            ?line error({timeout,request_line})
    end.
otp_9389_loop(S, OrigLinkHdr, ok) ->
    ?line Resp = "HTTP/1.1 200 OK\r\nContent-length: 0\r\n" ++
        "Link: " ++ OrigLinkHdr ++ "\r\n\r\n",
    ?line ok = gen_tcp:send(S, Resp);
otp_9389_loop(S, OrigLinkHdr, State) ->
    ?line ok = inet:setopts(S, [{active,once}, {packet,httph}]),
    receive
        {http, S, http_eoh} ->
            ?line otp_9389_loop(S, OrigLinkHdr, ok);
        {http, S, {http_header, _, "Link", _, LinkHdr}} ->
            ?line LinkHdr = OrigLinkHdr,
            ?line otp_9389_loop(S, OrigLinkHdr, State);
        {http, S, {http_header, _, _Hdr, _, _Val}} ->
            ?line otp_9389_loop(S, OrigLinkHdr, State);
        {http, S, {http_error, Err}} ->
            ?line error({error, Err})
    after
        3000 ->
            ?line error({timeout,header})
    end.

wrapping_oct(doc) ->
    "Check that 64bit octet counters work."; 
wrapping_oct(suite) ->
    [];
wrapping_oct(Config) when is_list(Config) ->
    {ok,Sock} = gen_tcp:listen(0,[{active,false},{mode,binary}]),
    {ok,Port} = inet:port(Sock),
    spawn_link(?MODULE,oct_acceptor,[Sock]),
    Res = oct_datapump(Port,16#1FFFFFFFF),
    gen_tcp:close(Sock),
    ok = Res,
    ok.

oct_datapump(Port,N) ->
    {ok,Sock} = gen_tcp:connect("localhost",Port,
				[{active,false},{mode,binary}]),
    oct_pump(Sock,N,binary:copy(<<$a:8>>,100000),0).

oct_pump(S,N,_,_) when N =< 0 ->
    gen_tcp:close(S),
    ok;
oct_pump(S,N,Bin,Last) ->
    case gen_tcp:send(S,Bin) of
	ok ->
	    {ok,Stat}=inet:getstat(S),
	    {_,R}=lists:keyfind(send_oct,1,Stat),
	    case (R < Last) of
		true ->
		    io:format("ERROR (output) ~p < ~p~n",[R,Last]),
		    output_counter_error;
		false ->
		    oct_pump(S,N-byte_size(Bin),Bin,R)
	    end;
	_ ->
	    input_counter_error
    end.
    

oct_acceptor(Sock) ->
    {ok,Data} = gen_tcp:accept(Sock),
    oct_aloop(Data,0,0).

oct_aloop(S,X,Times) ->
    case gen_tcp:recv(S,0) of
	{ok,_} ->
	    {ok,Stat}=inet:getstat(S),
	    {_,R}=lists:keyfind(recv_oct,1,Stat),
	    case (R < X) of
		true ->
		    io:format("ERROR ~p < ~p~n",[R,X]),
		    gen_tcp:close(S),
		    input_counter_error;
		false ->
		    case Times rem 16#FFFFF of
			0 ->
			    io:format("Read: ~p~n",[R]);
			_ ->
			    ok
		    end,
		    oct_aloop(S,R,Times+1)
	    end;
	_ ->
	    gen_tcp:close(S),
	    closed
    end.

ok({ok,V}) -> V.