aboutsummaryrefslogtreecommitdiff
path: root/src/init.cpp
blob: 68ca62288db8d31344f8cbdce42c96028bb7d3ec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
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
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "txdb.h"
#include "walletdb.h"
#include "bitcoinrpc.h"
#include "net.h"
#include "init.h"
#include "util.h"
#include "ui_interface.h"

#include <boost/filesystem.hpp>
#include <boost/filesystem/fstream.hpp>
#include <boost/filesystem/convenience.hpp>
#include <boost/interprocess/sync/file_lock.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include <openssl/crypto.h>

#ifndef WIN32
#include <signal.h>
#endif

using namespace std;
using namespace boost;

CWallet* pwalletMain;
CClientUIInterface uiInterface;

#ifdef WIN32
// Win32 LevelDB doesn't use filedescriptors, and the ones used for
// accessing block files, don't count towards to fd_set size limit
// anyway.
#define MIN_CORE_FILEDESCRIPTORS 0
#else
#define MIN_CORE_FILEDESCRIPTORS 150
#endif

// Used to pass flags to the Bind() function
enum BindFlags {
    BF_NONE         = 0,
    BF_EXPLICIT     = (1U << 0),
    BF_REPORT_ERROR = (1U << 1)
};

//////////////////////////////////////////////////////////////////////////////
//
// Shutdown
//

//
// Thread management and startup/shutdown:
//
// The network-processing threads are all part of a thread group
// created by AppInit() or the Qt main() function.
//
// A clean exit happens when StartShutdown() or the SIGTERM
// signal handler sets fRequestShutdown, which triggers
// the DetectShutdownThread(), which interrupts the main thread group.
// DetectShutdownThread() then exits, which causes AppInit() to
// continue (it .joins the shutdown thread).
// Shutdown() is then
// called to clean up database connections, and stop other
// threads that should only be stopped after the main network-processing
// threads have exited.
//
// Note that if running -daemon the parent process returns from AppInit2
// before adding any threads to the threadGroup, so .join_all() returns
// immediately and the parent exits from main().
//
// Shutdown for Qt is very similar, only it uses a QTimer to detect
// fRequestShutdown getting set, and then does the normal Qt
// shutdown thing.
//

volatile bool fRequestShutdown = false;

void StartShutdown()
{
    fRequestShutdown = true;
}
bool ShutdownRequested()
{
    return fRequestShutdown;
}

static CCoinsViewDB *pcoinsdbview;

void Shutdown()
{
    printf("Shutdown : In progress...\n");
    static CCriticalSection cs_Shutdown;
    TRY_LOCK(cs_Shutdown, lockShutdown);
    if (!lockShutdown) return;

    RenameThread("bitcoin-shutoff");
    nTransactionsUpdated++;
    StopRPCThreads();
    bitdb.Flush(false);
    StopNode();
    {
        LOCK(cs_main);
        if (pwalletMain)
            pwalletMain->SetBestChain(CBlockLocator(pindexBest));
        if (pblocktree)
            pblocktree->Flush();
        if (pcoinsTip)
            pcoinsTip->Flush();
        delete pcoinsTip; pcoinsTip = NULL;
        delete pcoinsdbview; pcoinsdbview = NULL;
        delete pblocktree; pblocktree = NULL;
    }
    bitdb.Flush(true);
    boost::filesystem::remove(GetPidFile());
    UnregisterWallet(pwalletMain);
    delete pwalletMain;
    printf("Shutdown : done\n");
}

//
// Signal handlers are very limited in what they are allowed to do, so:
//
void DetectShutdownThread(boost::thread_group* threadGroup)
{
    // Tell the main threads to shutdown.
    while (!fRequestShutdown)
    {
        MilliSleep(200);
        if (fRequestShutdown)
            threadGroup->interrupt_all();
    }
}

void HandleSIGTERM(int)
{
    fRequestShutdown = true;
}

void HandleSIGHUP(int)
{
    fReopenDebugLog = true;
}





//////////////////////////////////////////////////////////////////////////////
//
// Start
//
#if !defined(QT_GUI)
bool AppInit(int argc, char* argv[])
{
    boost::thread_group threadGroup;
    boost::thread* detectShutdownThread = NULL;

    bool fRet = false;
    try
    {
        //
        // Parameters
        //
        // If Qt is used, parameters/bitcoin.conf are parsed in qt/bitcoin.cpp's main()
        ParseParameters(argc, argv);
        if (!boost::filesystem::is_directory(GetDataDir(false)))
        {
            fprintf(stderr, "Error: Specified directory does not exist\n");
            Shutdown();
        }
        ReadConfigFile(mapArgs, mapMultiArgs);

        if (mapArgs.count("-?") || mapArgs.count("--help"))
        {
            // First part of help message is specific to bitcoind / RPC client
            std::string strUsage = _("Bitcoin version") + " " + FormatFullVersion() + "\n\n" +
                _("Usage:") + "\n" +
                  "  bitcoind [options]                     " + "\n" +
                  "  bitcoind [options] <command> [params]  " + _("Send command to -server or bitcoind") + "\n" +
                  "  bitcoind [options] help                " + _("List commands") + "\n" +
                  "  bitcoind [options] help <command>      " + _("Get help for a command") + "\n";

            strUsage += "\n" + HelpMessage();

            fprintf(stdout, "%s", strUsage.c_str());
            return false;
        }

        // Command-line RPC
        for (int i = 1; i < argc; i++)
            if (!IsSwitchChar(argv[i][0]) && !boost::algorithm::istarts_with(argv[i], "bitcoin:"))
                fCommandLine = true;

        if (fCommandLine)
        {
            int ret = CommandLineRPC(argc, argv);
            exit(ret);
        }
#if !defined(WIN32)
        fDaemon = GetBoolArg("-daemon");
        if (fDaemon)
        {
            // Daemonize
            pid_t pid = fork();
            if (pid < 0)
            {
                fprintf(stderr, "Error: fork() returned %d errno %d\n", pid, errno);
                return false;
            }
            if (pid > 0) // Parent process, pid is child process id
            {
                CreatePidFile(GetPidFile(), pid);
                return true;
            }
            // Child process falls through to rest of initialization

            pid_t sid = setsid();
            if (sid < 0)
                fprintf(stderr, "Error: setsid() returned %d errno %d\n", sid, errno);
        }
#endif

        detectShutdownThread = new boost::thread(boost::bind(&DetectShutdownThread, &threadGroup));
        fRet = AppInit2(threadGroup);
    }
    catch (std::exception& e) {
        PrintExceptionContinue(&e, "AppInit()");
    } catch (...) {
        PrintExceptionContinue(NULL, "AppInit()");
    }
    if (!fRet) {
        if (detectShutdownThread)
            detectShutdownThread->interrupt();
        threadGroup.interrupt_all();
    }

    if (detectShutdownThread)
    {
        detectShutdownThread->join();
        delete detectShutdownThread;
        detectShutdownThread = NULL;
    }
    Shutdown();

    return fRet;
}

extern void noui_connect();
int main(int argc, char* argv[])
{
    bool fRet = false;

    // Connect bitcoind signal handlers
    noui_connect();

    fRet = AppInit(argc, argv);

    if (fRet && fDaemon)
        return 0;

    return (fRet ? 0 : 1);
}
#endif

bool static InitError(const std::string &str)
{
    uiInterface.ThreadSafeMessageBox(str, "", CClientUIInterface::MSG_ERROR);
    return false;
}

bool static InitWarning(const std::string &str)
{
    uiInterface.ThreadSafeMessageBox(str, "", CClientUIInterface::MSG_WARNING);
    return true;
}

bool static Bind(const CService &addr, unsigned int flags) {
    if (!(flags & BF_EXPLICIT) && IsLimited(addr))
        return false;
    std::string strError;
    if (!BindListenPort(addr, strError)) {
        if (flags & BF_REPORT_ERROR)
            return InitError(strError);
        return false;
    }
    return true;
}

// Core-specific options shared between UI and daemon
std::string HelpMessage()
{
    string strUsage = _("Options:") + "\n" +
        "  -?                     " + _("This help message") + "\n" +
        "  -conf=<file>           " + _("Specify configuration file (default: bitcoin.conf)") + "\n" +
        "  -pid=<file>            " + _("Specify pid file (default: bitcoind.pid)") + "\n" +
        "  -gen                   " + _("Generate coins (default: 0)") + "\n" +
        "  -datadir=<dir>         " + _("Specify data directory") + "\n" +
        "  -dbcache=<n>           " + _("Set database cache size in megabytes (default: 25)") + "\n" +
        "  -timeout=<n>           " + _("Specify connection timeout in milliseconds (default: 5000)") + "\n" +
        "  -proxy=<ip:port>       " + _("Connect through socks proxy") + "\n" +
        "  -socks=<n>             " + _("Select the version of socks proxy to use (4-5, default: 5)") + "\n" +
        "  -tor=<ip:port>         " + _("Use proxy to reach tor hidden services (default: same as -proxy)") + "\n"
        "  -dns                   " + _("Allow DNS lookups for -addnode, -seednode and -connect") + "\n" +
        "  -port=<port>           " + _("Listen for connections on <port> (default: 8333 or testnet: 18333)") + "\n" +
        "  -maxconnections=<n>    " + _("Maintain at most <n> connections to peers (default: 125)") + "\n" +
        "  -addnode=<ip>          " + _("Add a node to connect to and attempt to keep the connection open") + "\n" +
        "  -connect=<ip>          " + _("Connect only to the specified node(s)") + "\n" +
        "  -seednode=<ip>         " + _("Connect to a node to retrieve peer addresses, and disconnect") + "\n" +
        "  -externalip=<ip>       " + _("Specify your own public address") + "\n" +
        "  -onlynet=<net>         " + _("Only connect to nodes in network <net> (IPv4, IPv6 or Tor)") + "\n" +
        "  -discover              " + _("Discover own IP address (default: 1 when listening and no -externalip)") + "\n" +
        "  -checkpoints           " + _("Only accept block chain matching built-in checkpoints (default: 1)") + "\n" +
        "  -listen                " + _("Accept connections from outside (default: 1 if no -proxy or -connect)") + "\n" +
        "  -bind=<addr>           " + _("Bind to given address and always listen on it. Use [host]:port notation for IPv6") + "\n" +
        "  -dnsseed               " + _("Find peers using DNS lookup (default: 1 unless -connect)") + "\n" +
        "  -banscore=<n>          " + _("Threshold for disconnecting misbehaving peers (default: 100)") + "\n" +
        "  -bantime=<n>           " + _("Number of seconds to keep misbehaving peers from reconnecting (default: 86400)") + "\n" +
        "  -maxreceivebuffer=<n>  " + _("Maximum per-connection receive buffer, <n>*1000 bytes (default: 5000)") + "\n" +
        "  -maxsendbuffer=<n>     " + _("Maximum per-connection send buffer, <n>*1000 bytes (default: 1000)") + "\n" +
#ifdef USE_UPNP
#if USE_UPNP
        "  -upnp                  " + _("Use UPnP to map the listening port (default: 1 when listening)") + "\n" +
#else
        "  -upnp                  " + _("Use UPnP to map the listening port (default: 0)") + "\n" +
#endif
#endif
        "  -paytxfee=<amt>        " + _("Fee per KB to add to transactions you send") + "\n" +
#ifdef QT_GUI
        "  -server                " + _("Accept command line and JSON-RPC commands") + "\n" +
#endif
#if !defined(WIN32) && !defined(QT_GUI)
        "  -daemon                " + _("Run in the background as a daemon and accept commands") + "\n" +
#endif
        "  -testnet               " + _("Use the test network") + "\n" +
        "  -debug                 " + _("Output extra debugging information. Implies all other -debug* options") + "\n" +
        "  -debugnet              " + _("Output extra network debugging information") + "\n" +
        "  -logtimestamps         " + _("Prepend debug output with timestamp (default: 1)") + "\n" +
        "  -shrinkdebugfile       " + _("Shrink debug.log file on client startup (default: 1 when no -debug)") + "\n" +
        "  -printtoconsole        " + _("Send trace/debug info to console instead of debug.log file") + "\n" +
#ifdef WIN32
        "  -printtodebugger       " + _("Send trace/debug info to debugger") + "\n" +
#endif
        "  -rpcuser=<user>        " + _("Username for JSON-RPC connections") + "\n" +
        "  -rpcpassword=<pw>      " + _("Password for JSON-RPC connections") + "\n" +
        "  -rpcport=<port>        " + _("Listen for JSON-RPC connections on <port> (default: 8332 or testnet: 18332)") + "\n" +
        "  -rpcallowip=<ip>       " + _("Allow JSON-RPC connections from specified IP address") + "\n" +
#ifndef QT_GUI
        "  -rpcconnect=<ip>       " + _("Send commands to node running on <ip> (default: 127.0.0.1)") + "\n" +
#endif
        "  -rpcthreads=<n>        " + _("Set the number of threads to service RPC calls (default: 4)") + "\n" +
        "  -blocknotify=<cmd>     " + _("Execute command when the best block changes (%s in cmd is replaced by block hash)") + "\n" +
        "  -walletnotify=<cmd>    " + _("Execute command when a wallet transaction changes (%s in cmd is replaced by TxID)") + "\n" +
        "  -alertnotify=<cmd>     " + _("Execute command when a relevant alert is received (%s in cmd is replaced by message)") + "\n" +
        "  -upgradewallet         " + _("Upgrade wallet to latest format") + "\n" +
        "  -keypool=<n>           " + _("Set key pool size to <n> (default: 100)") + "\n" +
        "  -rescan                " + _("Rescan the block chain for missing wallet transactions") + "\n" +
        "  -salvagewallet         " + _("Attempt to recover private keys from a corrupt wallet.dat") + "\n" +
        "  -checkblocks=<n>       " + _("How many blocks to check at startup (default: 288, 0 = all)") + "\n" +
        "  -checklevel=<n>        " + _("How thorough the block verification is (0-4, default: 3)") + "\n" +
        "  -txindex               " + _("Maintain a full transaction index (default: 0)") + "\n" +
        "  -loadblock=<file>      " + _("Imports blocks from external blk000??.dat file") + "\n" +
        "  -reindex               " + _("Rebuild block chain index from current blk000??.dat files") + "\n" +
        "  -par=<n>               " + _("Set the number of script verification threads (up to 16, 0 = auto, <0 = leave that many cores free, default: 0)") + "\n" +

        "\n" + _("Block creation options:") + "\n" +
        "  -blockminsize=<n>      "   + _("Set minimum block size in bytes (default: 0)") + "\n" +
        "  -blockmaxsize=<n>      "   + _("Set maximum block size in bytes (default: 250000)") + "\n" +
        "  -blockprioritysize=<n> "   + _("Set maximum size of high-priority/low-fee transactions in bytes (default: 27000)") + "\n" +

        "\n" + _("SSL options: (see the Bitcoin Wiki for SSL setup instructions)") + "\n" +
        "  -rpcssl                                  " + _("Use OpenSSL (https) for JSON-RPC connections") + "\n" +
        "  -rpcsslcertificatechainfile=<file.cert>  " + _("Server certificate file (default: server.cert)") + "\n" +
        "  -rpcsslprivatekeyfile=<file.pem>         " + _("Server private key (default: server.pem)") + "\n" +
        "  -rpcsslciphers=<ciphers>                 " + _("Acceptable ciphers (default: TLSv1+HIGH:!SSLv2:!aNULL:!eNULL:!AH:!3DES:@STRENGTH)") + "\n";

    return strUsage;
}

struct CImportingNow
{
    CImportingNow() {
        assert(fImporting == false);
        fImporting = true;
    }

    ~CImportingNow() {
        assert(fImporting == true);
        fImporting = false;
    }
};

void ThreadImport(std::vector<boost::filesystem::path> vImportFiles)
{
    RenameThread("bitcoin-loadblk");

    // -reindex
    if (fReindex) {
        CImportingNow imp;
        int nFile = 0;
        while (true) {
            CDiskBlockPos pos(nFile, 0);
            FILE *file = OpenBlockFile(pos, true);
            if (!file)
                break;
            printf("Reindexing block file blk%05u.dat...\n", (unsigned int)nFile);
            LoadExternalBlockFile(file, &pos);
            nFile++;
        }
        pblocktree->WriteReindexing(false);
        fReindex = false;
        printf("Reindexing finished\n");
        // To avoid ending up in a situation without genesis block, re-try initializing (no-op if reindexing worked):
        InitBlockIndex();
    }

    // hardcoded $DATADIR/bootstrap.dat
    filesystem::path pathBootstrap = GetDataDir() / "bootstrap.dat";
    if (filesystem::exists(pathBootstrap)) {
        FILE *file = fopen(pathBootstrap.string().c_str(), "rb");
        if (file) {
            CImportingNow imp;
            filesystem::path pathBootstrapOld = GetDataDir() / "bootstrap.dat.old";
            printf("Importing bootstrap.dat...\n");
            LoadExternalBlockFile(file);
            RenameOver(pathBootstrap, pathBootstrapOld);
        }
    }

    // -loadblock=
    BOOST_FOREACH(boost::filesystem::path &path, vImportFiles) {
        FILE *file = fopen(path.string().c_str(), "rb");
        if (file) {
            CImportingNow imp;
            printf("Importing %s...\n", path.string().c_str());
            LoadExternalBlockFile(file);
        }
    }
}

/** Initialize bitcoin.
 *  @pre Parameters should be parsed and config file should be read.
 */
bool AppInit2(boost::thread_group& threadGroup)
{
    // ********************************************************* Step 1: setup
#ifdef _MSC_VER
    // Turn off Microsoft heap dump noise
    _CrtSetReportMode(_CRT_WARN, _CRTDBG_MODE_FILE);
    _CrtSetReportFile(_CRT_WARN, CreateFileA("NUL", GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, 0));
#endif
#if _MSC_VER >= 1400
    // Disable confusing "helpful" text message on abort, Ctrl-C
    _set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT);
#endif
#ifdef WIN32
    // Enable Data Execution Prevention (DEP)
    // Minimum supported OS versions: WinXP SP3, WinVista >= SP1, Win Server 2008
    // A failure is non-critical and needs no further attention!
#ifndef PROCESS_DEP_ENABLE
// We define this here, because GCCs winbase.h limits this to _WIN32_WINNT >= 0x0601 (Windows 7),
// which is not correct. Can be removed, when GCCs winbase.h is fixed!
#define PROCESS_DEP_ENABLE 0x00000001
#endif
    typedef BOOL (WINAPI *PSETPROCDEPPOL)(DWORD);
    PSETPROCDEPPOL setProcDEPPol = (PSETPROCDEPPOL)GetProcAddress(GetModuleHandleA("Kernel32.dll"), "SetProcessDEPPolicy");
    if (setProcDEPPol != NULL) setProcDEPPol(PROCESS_DEP_ENABLE);

    // Initialize Windows Sockets
    WSADATA wsadata;
    int ret = WSAStartup(MAKEWORD(2,2), &wsadata);
    if (ret != NO_ERROR || LOBYTE(wsadata.wVersion ) != 2 || HIBYTE(wsadata.wVersion) != 2)
    {
        return InitError(strprintf("Error: Winsock library failed to start (WSAStartup returned error %d)", ret));
    }
#endif
#ifndef WIN32
    umask(077);

    // Clean shutdown on SIGTERM
    struct sigaction sa;
    sa.sa_handler = HandleSIGTERM;
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = 0;
    sigaction(SIGTERM, &sa, NULL);
    sigaction(SIGINT, &sa, NULL);

    // Reopen debug.log on SIGHUP
    struct sigaction sa_hup;
    sa_hup.sa_handler = HandleSIGHUP;
    sigemptyset(&sa_hup.sa_mask);
    sa_hup.sa_flags = 0;
    sigaction(SIGHUP, &sa_hup, NULL);
#endif

    // ********************************************************* Step 2: parameter interactions

    fTestNet = GetBoolArg("-testnet");

    if (mapArgs.count("-bind")) {
        // when specifying an explicit binding address, you want to listen on it
        // even when -connect or -proxy is specified
        SoftSetBoolArg("-listen", true);
    }

    if (mapArgs.count("-connect") && mapMultiArgs["-connect"].size() > 0) {
        // when only connecting to trusted nodes, do not seed via DNS, or listen by default
        SoftSetBoolArg("-dnsseed", false);
        SoftSetBoolArg("-listen", false);
    }

    if (mapArgs.count("-proxy")) {
        // to protect privacy, do not listen by default if a proxy server is specified
        SoftSetBoolArg("-listen", false);
    }

    if (!GetBoolArg("-listen", true)) {
        // do not map ports or try to retrieve public IP when not listening (pointless)
        SoftSetBoolArg("-upnp", false);
        SoftSetBoolArg("-discover", false);
    }

    if (mapArgs.count("-externalip")) {
        // if an explicit public IP is specified, do not try to find others
        SoftSetBoolArg("-discover", false);
    }

    if (GetBoolArg("-salvagewallet")) {
        // Rewrite just private keys: rescan to find transactions
        SoftSetBoolArg("-rescan", true);
    }

    // Make sure enough file descriptors are available
    int nBind = std::max((int)mapArgs.count("-bind"), 1);
    nMaxConnections = GetArg("-maxconnections", 125);
    nMaxConnections = std::max(std::min(nMaxConnections, (int)(FD_SETSIZE - nBind - MIN_CORE_FILEDESCRIPTORS)), 0);
    int nFD = RaiseFileDescriptorLimit(nMaxConnections + MIN_CORE_FILEDESCRIPTORS);
    if (nFD < MIN_CORE_FILEDESCRIPTORS)
        return InitError(_("Not enough file descriptors available."));
    if (nFD - MIN_CORE_FILEDESCRIPTORS < nMaxConnections)
        nMaxConnections = nFD - MIN_CORE_FILEDESCRIPTORS;

    // ********************************************************* Step 3: parameter-to-internal-flags

    fDebug = GetBoolArg("-debug");
    fBenchmark = GetBoolArg("-benchmark");

    // -par=0 means autodetect, but nScriptCheckThreads==0 means no concurrency
    nScriptCheckThreads = GetArg("-par", 0);
    if (nScriptCheckThreads <= 0)
        nScriptCheckThreads += boost::thread::hardware_concurrency();
    if (nScriptCheckThreads <= 1)
        nScriptCheckThreads = 0;
    else if (nScriptCheckThreads > MAX_SCRIPTCHECK_THREADS)
        nScriptCheckThreads = MAX_SCRIPTCHECK_THREADS;

    // -debug implies fDebug*
    if (fDebug)
        fDebugNet = true;
    else
        fDebugNet = GetBoolArg("-debugnet");

    if (fDaemon)
        fServer = true;
    else
        fServer = GetBoolArg("-server");

    /* force fServer when running without GUI */
#if !defined(QT_GUI)
    fServer = true;
#endif
    fPrintToConsole = GetBoolArg("-printtoconsole");
    fPrintToDebugger = GetBoolArg("-printtodebugger");
    fLogTimestamps = GetBoolArg("-logtimestamps", true);

    if (mapArgs.count("-timeout"))
    {
        int nNewTimeout = GetArg("-timeout", 5000);
        if (nNewTimeout > 0 && nNewTimeout < 600000)
            nConnectTimeout = nNewTimeout;
    }

    // Continue to put "/P2SH/" in the coinbase to monitor
    // BIP16 support.
    // This can be removed eventually...
    const char* pszP2SH = "/P2SH/";
    COINBASE_FLAGS << std::vector<unsigned char>(pszP2SH, pszP2SH+strlen(pszP2SH));

    // Fee-per-kilobyte amount considered the same as "free"
    // If you are mining, be careful setting this:
    // if you set it to zero then
    // a transaction spammer can cheaply fill blocks using
    // 1-satoshi-fee transactions. It should be set above the real
    // cost to you of processing a transaction.
    if (mapArgs.count("-mintxfee"))
    {
        int64 n = 0;
        if (ParseMoney(mapArgs["-mintxfee"], n) && n > 0)
            CTransaction::nMinTxFee = n;
        else
            return InitError(strprintf(_("Invalid amount for -mintxfee=<amount>: '%s'"), mapArgs["-mintxfee"].c_str()));
    }
    if (mapArgs.count("-minrelaytxfee"))
    {
        int64 n = 0;
        if (ParseMoney(mapArgs["-minrelaytxfee"], n) && n > 0)
            CTransaction::nMinRelayTxFee = n;
        else
            return InitError(strprintf(_("Invalid amount for -minrelaytxfee=<amount>: '%s'"), mapArgs["-minrelaytxfee"].c_str()));
    }

    if (mapArgs.count("-paytxfee"))
    {
        if (!ParseMoney(mapArgs["-paytxfee"], nTransactionFee))
            return InitError(strprintf(_("Invalid amount for -paytxfee=<amount>: '%s'"), mapArgs["-paytxfee"].c_str()));
        if (nTransactionFee > 0.25 * COIN)
            InitWarning(_("Warning: -paytxfee is set very high! This is the transaction fee you will pay if you send a transaction."));
    }

    // ********************************************************* Step 4: application initialization: dir lock, daemonize, pidfile, debug log

    std::string strDataDir = GetDataDir().string();

    // Make sure only a single Bitcoin process is using the data directory.
    boost::filesystem::path pathLockFile = GetDataDir() / ".lock";
    FILE* file = fopen(pathLockFile.string().c_str(), "a"); // empty lock file; created if it doesn't exist.
    if (file) fclose(file);
    static boost::interprocess::file_lock lock(pathLockFile.string().c_str());
    if (!lock.try_lock())
        return InitError(strprintf(_("Cannot obtain a lock on data directory %s. Bitcoin is probably already running."), strDataDir.c_str()));

    if (GetBoolArg("-shrinkdebugfile", !fDebug))
        ShrinkDebugFile();
    printf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
    printf("Bitcoin version %s (%s)\n", FormatFullVersion().c_str(), CLIENT_DATE.c_str());
    printf("Using OpenSSL version %s\n", SSLeay_version(SSLEAY_VERSION));
    if (!fLogTimestamps)
        printf("Startup time: %s\n", DateTimeStrFormat("%Y-%m-%d %H:%M:%S", GetTime()).c_str());
    printf("Default data directory %s\n", GetDefaultDataDir().string().c_str());
    printf("Using data directory %s\n", strDataDir.c_str());
    printf("Using at most %i connections (%i file descriptors available)\n", nMaxConnections, nFD);
    std::ostringstream strErrors;

    if (fDaemon)
        fprintf(stdout, "Bitcoin server starting\n");

    if (nScriptCheckThreads) {
        printf("Using %u threads for script verification\n", nScriptCheckThreads);
        for (int i=0; i<nScriptCheckThreads-1; i++)
            threadGroup.create_thread(&ThreadScriptCheck);
    }

    int64 nStart;

    // ********************************************************* Step 5: verify wallet database integrity

    uiInterface.InitMessage(_("Verifying wallet..."));

    if (!bitdb.Open(GetDataDir()))
    {
        // try moving the database env out of the way
        boost::filesystem::path pathDatabase = GetDataDir() / "database";
        boost::filesystem::path pathDatabaseBak = GetDataDir() / strprintf("database.%"PRI64d".bak", GetTime());
        try {
            boost::filesystem::rename(pathDatabase, pathDatabaseBak);
            printf("Moved old %s to %s. Retrying.\n", pathDatabase.string().c_str(), pathDatabaseBak.string().c_str());
        } catch(boost::filesystem::filesystem_error &error) {
             // failure is ok (well, not really, but it's not worse than what we started with)
        }

        // try again
        if (!bitdb.Open(GetDataDir())) {
            // if it still fails, it probably means we can't even create the database env
            string msg = strprintf(_("Error initializing wallet database environment %s!"), strDataDir.c_str());
            return InitError(msg);
        }
    }

    if (GetBoolArg("-salvagewallet"))
    {
        // Recover readable keypairs:
        if (!CWalletDB::Recover(bitdb, "wallet.dat", true))
            return false;
    }

    if (filesystem::exists(GetDataDir() / "wallet.dat"))
    {
        CDBEnv::VerifyResult r = bitdb.Verify("wallet.dat", CWalletDB::Recover);
        if (r == CDBEnv::RECOVER_OK)
        {
            string msg = strprintf(_("Warning: wallet.dat corrupt, data salvaged!"
                                     " Original wallet.dat saved as wallet.{timestamp}.bak in %s; if"
                                     " your balance or transactions are incorrect you should"
                                     " restore from a backup."), strDataDir.c_str());
            InitWarning(msg);
        }
        if (r == CDBEnv::RECOVER_FAIL)
            return InitError(_("wallet.dat corrupt, salvage failed"));
    }

    // ********************************************************* Step 6: network initialization

    int nSocksVersion = GetArg("-socks", 5);
    if (nSocksVersion != 4 && nSocksVersion != 5)
        return InitError(strprintf(_("Unknown -socks proxy version requested: %i"), nSocksVersion));

    if (mapArgs.count("-onlynet")) {
        std::set<enum Network> nets;
        BOOST_FOREACH(std::string snet, mapMultiArgs["-onlynet"]) {
            enum Network net = ParseNetwork(snet);
            if (net == NET_UNROUTABLE)
                return InitError(strprintf(_("Unknown network specified in -onlynet: '%s'"), snet.c_str()));
            nets.insert(net);
        }
        for (int n = 0; n < NET_MAX; n++) {
            enum Network net = (enum Network)n;
            if (!nets.count(net))
                SetLimited(net);
        }
    }
#if defined(USE_IPV6)
#if ! USE_IPV6
    else
        SetLimited(NET_IPV6);
#endif
#endif

    CService addrProxy;
    bool fProxy = false;
    if (mapArgs.count("-proxy")) {
        addrProxy = CService(mapArgs["-proxy"], 9050);
        if (!addrProxy.IsValid())
            return InitError(strprintf(_("Invalid -proxy address: '%s'"), mapArgs["-proxy"].c_str()));

        if (!IsLimited(NET_IPV4))
            SetProxy(NET_IPV4, addrProxy, nSocksVersion);
        if (nSocksVersion > 4) {
#ifdef USE_IPV6
            if (!IsLimited(NET_IPV6))
                SetProxy(NET_IPV6, addrProxy, nSocksVersion);
#endif
            SetNameProxy(addrProxy, nSocksVersion);
        }
        fProxy = true;
    }

    // -tor can override normal proxy, -notor disables tor entirely
    if (!(mapArgs.count("-tor") && mapArgs["-tor"] == "0") && (fProxy || mapArgs.count("-tor"))) {
        CService addrOnion;
        if (!mapArgs.count("-tor"))
            addrOnion = addrProxy;
        else
            addrOnion = CService(mapArgs["-tor"], 9050);
        if (!addrOnion.IsValid())
            return InitError(strprintf(_("Invalid -tor address: '%s'"), mapArgs["-tor"].c_str()));
        SetProxy(NET_TOR, addrOnion, 5);
        SetReachable(NET_TOR);
    }

    // see Step 2: parameter interactions for more information about these
    fNoListen = !GetBoolArg("-listen", true);
    fDiscover = GetBoolArg("-discover", true);
    fNameLookup = GetBoolArg("-dns", true);

    bool fBound = false;
    if (!fNoListen) {
        if (mapArgs.count("-bind")) {
            BOOST_FOREACH(std::string strBind, mapMultiArgs["-bind"]) {
                CService addrBind;
                if (!Lookup(strBind.c_str(), addrBind, GetListenPort(), false))
                    return InitError(strprintf(_("Cannot resolve -bind address: '%s'"), strBind.c_str()));
                fBound |= Bind(addrBind, (BF_EXPLICIT | BF_REPORT_ERROR));
            }
        }
        else {
            struct in_addr inaddr_any;
            inaddr_any.s_addr = INADDR_ANY;
#ifdef USE_IPV6
            fBound |= Bind(CService(in6addr_any, GetListenPort()), BF_NONE);
#endif
            fBound |= Bind(CService(inaddr_any, GetListenPort()), !fBound ? BF_REPORT_ERROR : BF_NONE);
        }
        if (!fBound)
            return InitError(_("Failed to listen on any port. Use -listen=0 if you want this."));
    }

    if (mapArgs.count("-externalip")) {
        BOOST_FOREACH(string strAddr, mapMultiArgs["-externalip"]) {
            CService addrLocal(strAddr, GetListenPort(), fNameLookup);
            if (!addrLocal.IsValid())
                return InitError(strprintf(_("Cannot resolve -externalip address: '%s'"), strAddr.c_str()));
            AddLocal(CService(strAddr, GetListenPort(), fNameLookup), LOCAL_MANUAL);
        }
    }

    BOOST_FOREACH(string strDest, mapMultiArgs["-seednode"])
        AddOneShot(strDest);

    // ********************************************************* Step 7: load block chain

    fReindex = GetBoolArg("-reindex");

    // Upgrading to 0.8; hard-link the old blknnnn.dat files into /blocks/
    filesystem::path blocksDir = GetDataDir() / "blocks";
    if (!filesystem::exists(blocksDir))
    {
        filesystem::create_directories(blocksDir);
        bool linked = false;
        for (unsigned int i = 1; i < 10000; i++) {
            filesystem::path source = GetDataDir() / strprintf("blk%04u.dat", i);
            if (!filesystem::exists(source)) break;
            filesystem::path dest = blocksDir / strprintf("blk%05u.dat", i-1);
            try {
                filesystem::create_hard_link(source, dest);
                printf("Hardlinked %s -> %s\n", source.string().c_str(), dest.string().c_str());
                linked = true;
            } catch (filesystem::filesystem_error & e) {
                // Note: hardlink creation failing is not a disaster, it just means
                // blocks will get re-downloaded from peers.
                printf("Error hardlinking blk%04u.dat : %s\n", i, e.what());
                break;
            }
        }
        if (linked)
        {
            fReindex = true;
        }
    }

    // cache size calculations
    size_t nTotalCache = GetArg("-dbcache", 25) << 20;
    if (nTotalCache < (1 << 22))
        nTotalCache = (1 << 22); // total cache cannot be less than 4 MiB
    size_t nBlockTreeDBCache = nTotalCache / 8;
    if (nBlockTreeDBCache > (1 << 21) && !GetBoolArg("-txindex", false))
        nBlockTreeDBCache = (1 << 21); // block tree db cache shouldn't be larger than 2 MiB
    nTotalCache -= nBlockTreeDBCache;
    size_t nCoinDBCache = nTotalCache / 2; // use half of the remaining cache for coindb cache
    nTotalCache -= nCoinDBCache;
    nCoinCacheSize = nTotalCache / 300; // coins in memory require around 300 bytes

    bool fLoaded = false;
    while (!fLoaded) {
        bool fReset = fReindex;
        std::string strLoadError;

        uiInterface.InitMessage(_("Loading block index..."));

        nStart = GetTimeMillis();
        do {
            try {
                UnloadBlockIndex();
                delete pcoinsTip;
                delete pcoinsdbview;
                delete pblocktree;

                pblocktree = new CBlockTreeDB(nBlockTreeDBCache, false, fReindex);
                pcoinsdbview = new CCoinsViewDB(nCoinDBCache, false, fReindex);
                pcoinsTip = new CCoinsViewCache(*pcoinsdbview);

                if (fReindex)
                    pblocktree->WriteReindexing(true);

                if (!LoadBlockIndex()) {
                    strLoadError = _("Error loading block database");
                    break;
                }

                // Initialize the block index (no-op if non-empty database was already loaded)
                if (!InitBlockIndex()) {
                    strLoadError = _("Error initializing block database");
                    break;
                }

                uiInterface.InitMessage(_("Verifying blocks..."));
                if (!VerifyDB()) {
                    strLoadError = _("Corrupted block database detected");
                    break;
                }
            } catch(std::exception &e) {
                strLoadError = _("Error opening block database");
                break;
            }

            fLoaded = true;
        } while(false);

        if (!fLoaded) {
            // first suggest a reindex
            if (!fReset) {
                bool fRet = uiInterface.ThreadSafeMessageBox(
                    strLoadError + ".\n" + _("Do you want to rebuild the block database now?"),
                    "", CClientUIInterface::MSG_ERROR | CClientUIInterface::BTN_ABORT);
                if (fRet) {
                    fReindex = true;
                    fRequestShutdown = false;
                } else {
                    return false;
                }
            } else {
                return InitError(strLoadError);
            }
        }
    }

    if (mapArgs.count("-txindex") && fTxIndex != GetBoolArg("-txindex", false))
        return InitError(_("You need to rebuild the databases using -reindex to change -txindex"));

    // as LoadBlockIndex can take several minutes, it's possible the user
    // requested to kill bitcoin-qt during the last operation. If so, exit.
    // As the program has not fully started yet, Shutdown() is possibly overkill.
    if (fRequestShutdown)
    {
        printf("Shutdown requested. Exiting.\n");
        return false;
    }
    printf(" block index %15"PRI64d"ms\n", GetTimeMillis() - nStart);

    if (GetBoolArg("-printblockindex") || GetBoolArg("-printblocktree"))
    {
        PrintBlockTree();
        return false;
    }

    if (mapArgs.count("-printblock"))
    {
        string strMatch = mapArgs["-printblock"];
        int nFound = 0;
        for (map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.begin(); mi != mapBlockIndex.end(); ++mi)
        {
            uint256 hash = (*mi).first;
            if (strncmp(hash.ToString().c_str(), strMatch.c_str(), strMatch.size()) == 0)
            {
                CBlockIndex* pindex = (*mi).second;
                CBlock block;
                block.ReadFromDisk(pindex);
                block.BuildMerkleTree();
                block.print();
                printf("\n");
                nFound++;
            }
        }
        if (nFound == 0)
            printf("No blocks matching %s were found\n", strMatch.c_str());
        return false;
    }

    // ********************************************************* Step 8: load wallet

    uiInterface.InitMessage(_("Loading wallet..."));

    nStart = GetTimeMillis();
    bool fFirstRun = true;
    pwalletMain = new CWallet("wallet.dat");
    DBErrors nLoadWalletRet = pwalletMain->LoadWallet(fFirstRun);
    if (nLoadWalletRet != DB_LOAD_OK)
    {
        if (nLoadWalletRet == DB_CORRUPT)
            strErrors << _("Error loading wallet.dat: Wallet corrupted") << "\n";
        else if (nLoadWalletRet == DB_NONCRITICAL_ERROR)
        {
            string msg(_("Warning: error reading wallet.dat! All keys read correctly, but transaction data"
                         " or address book entries might be missing or incorrect."));
            InitWarning(msg);
        }
        else if (nLoadWalletRet == DB_TOO_NEW)
            strErrors << _("Error loading wallet.dat: Wallet requires newer version of Bitcoin") << "\n";
        else if (nLoadWalletRet == DB_NEED_REWRITE)
        {
            strErrors << _("Wallet needed to be rewritten: restart Bitcoin to complete") << "\n";
            printf("%s", strErrors.str().c_str());
            return InitError(strErrors.str());
        }
        else
            strErrors << _("Error loading wallet.dat") << "\n";
    }

    if (GetBoolArg("-upgradewallet", fFirstRun))
    {
        int nMaxVersion = GetArg("-upgradewallet", 0);
        if (nMaxVersion == 0) // the -upgradewallet without argument case
        {
            printf("Performing wallet upgrade to %i\n", FEATURE_LATEST);
            nMaxVersion = CLIENT_VERSION;
            pwalletMain->SetMinVersion(FEATURE_LATEST); // permanently upgrade the wallet immediately
        }
        else
            printf("Allowing wallet upgrade up to %i\n", nMaxVersion);
        if (nMaxVersion < pwalletMain->GetVersion())
            strErrors << _("Cannot downgrade wallet") << "\n";
        pwalletMain->SetMaxVersion(nMaxVersion);
    }

    if (fFirstRun)
    {
        // Create new keyUser and set as default key
        RandAddSeedPerfmon();

        CPubKey newDefaultKey;
        if (pwalletMain->GetKeyFromPool(newDefaultKey, false)) {
            pwalletMain->SetDefaultKey(newDefaultKey);
            if (!pwalletMain->SetAddressBookName(pwalletMain->vchDefaultKey.GetID(), ""))
                strErrors << _("Cannot write default address") << "\n";
        }

        pwalletMain->SetBestChain(CBlockLocator(pindexBest));
    }

    printf("%s", strErrors.str().c_str());
    printf(" wallet      %15"PRI64d"ms\n", GetTimeMillis() - nStart);

    RegisterWallet(pwalletMain);

    CBlockIndex *pindexRescan = pindexBest;
    if (GetBoolArg("-rescan"))
        pindexRescan = pindexGenesisBlock;
    else
    {
        CWalletDB walletdb("wallet.dat");
        CBlockLocator locator;
        if (walletdb.ReadBestBlock(locator))
            pindexRescan = locator.GetBlockIndex();
        else
            pindexRescan = pindexGenesisBlock;
    }
    if (pindexBest && pindexBest != pindexRescan)
    {
        uiInterface.InitMessage(_("Rescanning..."));
        printf("Rescanning last %i blocks (from block %i)...\n", pindexBest->nHeight - pindexRescan->nHeight, pindexRescan->nHeight);
        nStart = GetTimeMillis();
        pwalletMain->ScanForWalletTransactions(pindexRescan, true);
        printf(" rescan      %15"PRI64d"ms\n", GetTimeMillis() - nStart);
        pwalletMain->SetBestChain(CBlockLocator(pindexBest));
        nWalletDBUpdated++;
    }

    // ********************************************************* Step 9: import blocks

    // scan for better chains in the block chain database, that are not yet connected in the active best chain
    CValidationState state;
    if (!ConnectBestBlock(state))
        strErrors << "Failed to connect best block";

    std::vector<boost::filesystem::path> vImportFiles;
    if (mapArgs.count("-loadblock"))
    {
        BOOST_FOREACH(string strFile, mapMultiArgs["-loadblock"])
            vImportFiles.push_back(strFile);
    }
    threadGroup.create_thread(boost::bind(&ThreadImport, vImportFiles));

    // ********************************************************* Step 10: load peers

    uiInterface.InitMessage(_("Loading addresses..."));

    nStart = GetTimeMillis();

    {
        CAddrDB adb;
        if (!adb.Read(addrman))
            printf("Invalid or missing peers.dat; recreating\n");
    }

    printf("Loaded %i addresses from peers.dat  %"PRI64d"ms\n",
           addrman.size(), GetTimeMillis() - nStart);

    // ********************************************************* Step 11: start node

    if (!CheckDiskSpace())
        return false;

    if (!strErrors.str().empty())
        return InitError(strErrors.str());

    RandAddSeedPerfmon();

    //// debug print
    printf("mapBlockIndex.size() = %"PRIszu"\n",   mapBlockIndex.size());
    printf("nBestHeight = %d\n",                   nBestHeight);
    printf("setKeyPool.size() = %"PRIszu"\n",      pwalletMain->setKeyPool.size());
    printf("mapWallet.size() = %"PRIszu"\n",       pwalletMain->mapWallet.size());
    printf("mapAddressBook.size() = %"PRIszu"\n",  pwalletMain->mapAddressBook.size());

    StartNode(threadGroup);

    if (fServer)
        StartRPCThreads();

    // Generate coins in the background
    GenerateBitcoins(GetBoolArg("-gen", false), pwalletMain);

    // ********************************************************* Step 12: finished

    uiInterface.InitMessage(_("Done loading"));

     // Add wallet transactions that aren't already in a block to mapTransactions
    pwalletMain->ReacceptWalletTransactions();

    // Run a thread to flush wallet periodically
    threadGroup.create_thread(boost::bind(&ThreadFlushWalletDB, boost::ref(pwalletMain->strWalletFile)));

    return !fRequestShutdown;
}