about summary refs log blame commit diff
path: root/src/logging_unittest.cc
blob: 73d426b878d76981f4007a29e7ee55a32e53e0d1 (plain) (tree)
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
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348



































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                                              
// Copyright (c) 2002, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Author: Ray Sidney

#include "config_for_unittests.h"
#include "utilities.h"

#include <fcntl.h>
#ifdef HAVE_GLOB_H
# include <glob.h>
#endif
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif

#include <iomanip>
#include <iostream>
#include <fstream>
#include <memory>
#include <queue>
#include <sstream>
#include <string>
#include <vector>

#include <stdio.h>
#include <stdlib.h>

#include "base/commandlineflags.h"
#include "glog/logging.h"
#include "glog/raw_logging.h"
#include "googletest.h"

DECLARE_string(log_backtrace_at);  // logging.cc

#ifdef HAVE_LIB_GFLAGS
#include <gflags/gflags.h>
using namespace GFLAGS_NAMESPACE;
#endif

#ifdef HAVE_LIB_GMOCK
#include <gmock/gmock.h>
#include "mock-log.h"
// Introduce several symbols from gmock.
using testing::_;
using testing::AnyNumber;
using testing::HasSubstr;
using testing::AllOf;
using testing::StrNe;
using testing::StrictMock;
using testing::InitGoogleMock;
using GOOGLE_NAMESPACE::glog_testing::ScopedMockLog;
#endif

using namespace std;
using namespace GOOGLE_NAMESPACE;

// Some non-advertised functions that we want to test or use.
_START_GOOGLE_NAMESPACE_
namespace base {
namespace internal {
bool GetExitOnDFatal();
void SetExitOnDFatal(bool value);
}  // namespace internal
}  // namespace base
_END_GOOGLE_NAMESPACE_

static void TestLogging(bool check_counts);
static void TestRawLogging();
static void LogWithLevels(int v, int severity, bool err, bool alsoerr);
static void TestLoggingLevels();
static void TestLogString();
static void TestLogSink();
static void TestLogToString();
static void TestLogSinkWaitTillSent();
static void TestCHECK();
static void TestDCHECK();
static void TestSTREQ();
static void TestBasename();
static void TestBasenameAppendWhenNoTimestamp();
static void TestTwoProcessesWrite();
static void TestSymlink();
static void TestExtension();
static void TestWrapper();
static void TestErrno();
static void TestTruncate();
static void TestCustomLoggerDeletionOnShutdown();

static int x = -1;
static void BM_Check1(int n) {
  while (n-- > 0) {
    CHECK_GE(n, x);
    CHECK_GE(n, x);
    CHECK_GE(n, x);
    CHECK_GE(n, x);
    CHECK_GE(n, x);
    CHECK_GE(n, x);
    CHECK_GE(n, x);
    CHECK_GE(n, x);
  }
}
BENCHMARK(BM_Check1);

static void CheckFailure(int a, int b, const char* file, int line, const char* msg);
static void BM_Check3(int n) {
  while (n-- > 0) {
    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
    if (n < x) CheckFailure(n, x, __FILE__, __LINE__, "n < x");
  }
}
BENCHMARK(BM_Check3);

static void BM_Check2(int n) {
  if (n == 17) {
    x = 5;
  }
  while (n-- > 0) {
    CHECK(n >= x);
    CHECK(n >= x);
    CHECK(n >= x);
    CHECK(n >= x);
    CHECK(n >= x);
    CHECK(n >= x);
    CHECK(n >= x);
    CHECK(n >= x);
  }
}
BENCHMARK(BM_Check2);

static void CheckFailure(int, int, const char* /* file */, int /* line */,
                         const char* /* msg */) {
}

static void BM_logspeed(int n) {
  while (n-- > 0) {
    LOG(INFO) << "test message";
  }
}
BENCHMARK(BM_logspeed);

static void BM_vlog(int n) {
  while (n-- > 0) {
    VLOG(1) << "test message";
  }
}
BENCHMARK(BM_vlog);

int main(int argc, char **argv) {
  FLAGS_colorlogtostderr = false;
  FLAGS_timestamp_in_logfile_name = true;
#ifdef HAVE_LIB_GFLAGS
  ParseCommandLineFlags(&argc, &argv, true);
#endif
  // Make sure stderr is not buffered as stderr seems to be buffered
  // on recent windows.
  setbuf(stderr, NULL);

  // Test some basics before InitGoogleLogging:
  CaptureTestStderr();
  LogWithLevels(FLAGS_v, FLAGS_stderrthreshold,
                FLAGS_logtostderr, FLAGS_alsologtostderr);
  LogWithLevels(0, 0, 0, 0);  // simulate "before global c-tors"
  const string early_stderr = GetCapturedTestStderr();

  InitGoogleLogging(argv[0]);

  RunSpecifiedBenchmarks();

  FLAGS_logtostderr = true;

  InitGoogleTest(&argc, argv);
#ifdef HAVE_LIB_GMOCK
  InitGoogleMock(&argc, argv);
#endif

  // so that death tests run before we use threads
  CHECK_EQ(RUN_ALL_TESTS(), 0);

  CaptureTestStderr();

  // re-emit early_stderr
  LogMessage("dummy", LogMessage::kNoLogPrefix, GLOG_INFO).stream() << early_stderr;

  TestLogging(true);
  TestRawLogging();
  TestLoggingLevels();
  TestLogString();
  TestLogSink();
  TestLogToString();
  TestLogSinkWaitTillSent();
  TestCHECK();
  TestDCHECK();
  TestSTREQ();

  // TODO: The golden test portion of this test is very flakey.
  EXPECT_TRUE(
      MungeAndDiffTestStderr(FLAGS_test_srcdir + "/src/logging_unittest.err"));

  FLAGS_logtostderr = false;

  TestBasename();
  TestBasenameAppendWhenNoTimestamp();
  TestTwoProcessesWrite();
  TestSymlink();
  TestExtension();
  TestWrapper();
  TestErrno();
  TestTruncate();
  TestCustomLoggerDeletionOnShutdown();

  fprintf(stdout, "PASS\n");
  return 0;
}

void TestLogging(bool check_counts) {
  int64 base_num_infos   = LogMessage::num_messages(GLOG_INFO);
  int64 base_num_warning = LogMessage::num_messages(GLOG_WARNING);
  int64 base_num_errors  = LogMessage::num_messages(GLOG_ERROR);

  LOG(INFO) << string("foo ") << "bar " << 10 << ' ' << 3.4;
  for ( int i = 0; i < 10; ++i ) {
    int old_errno = errno;
    errno = i;
    PLOG_EVERY_N(ERROR, 2) << "Plog every 2, iteration " << COUNTER;
    errno = old_errno;

    LOG_EVERY_N(ERROR, 3) << "Log every 3, iteration " << COUNTER << endl;
    LOG_EVERY_N(ERROR, 4) << "Log every 4, iteration " << COUNTER << endl;

    LOG_IF_EVERY_N(WARNING, true, 5) << "Log if every 5, iteration " << COUNTER;
    LOG_IF_EVERY_N(WARNING, false, 3)
        << "Log if every 3, iteration " << COUNTER;
    LOG_IF_EVERY_N(INFO, true, 1) << "Log if every 1, iteration " << COUNTER;
    LOG_IF_EVERY_N(ERROR, (i < 3), 2)
        << "Log if less than 3 every 2, iteration " << COUNTER;
  }
  LOG_IF(WARNING, true) << "log_if this";
  LOG_IF(WARNING, false) << "don't log_if this";

  char s[] = "array";
  LOG(INFO) << s;
  const char const_s[] = "const array";
  LOG(INFO) << const_s;
  int j = 1000;
  LOG(ERROR) << string("foo") << ' '<< j << ' ' << setw(10) << j << " "
             << setw(1) << hex << j;

  {
    google::LogMessage outer(__FILE__, __LINE__, GLOG_ERROR);
    outer.stream() << "outer";

    LOG(ERROR) << "inner";
  }

  LogMessage("foo", LogMessage::kNoLogPrefix, GLOG_INFO).stream() << "no prefix";

  if (check_counts) {
    CHECK_EQ(base_num_infos   + 14, LogMessage::num_messages(GLOG_INFO));
    CHECK_EQ(base_num_warning + 3,  LogMessage::num_messages(GLOG_WARNING));
    CHECK_EQ(base_num_errors  + 17, LogMessage::num_messages(GLOG_ERROR));
  }
}

static void NoAllocNewHook() {
  LOG(FATAL) << "unexpected new";
}

struct NewHook {
  NewHook() {
    g_new_hook = &NoAllocNewHook;
  }
  ~NewHook() {
    g_new_hook = NULL;
  }
};

TEST(DeathNoAllocNewHook, logging) {
  // tests that NewHook used below works
  NewHook new_hook;
  ASSERT_DEATH({
    new int;
  }, "unexpected new");
}

void TestRawLogging() {
  string* foo = new string("foo ");
  string huge_str(50000, 'a');

  FlagSaver saver;

  // Check that RAW loggging does not use mallocs.
  NewHook new_hook;

  RAW_LOG(INFO, "%s%s%d%c%f", foo->c_str(), "bar ", 10, ' ', 3.4);
  char s[] = "array";
  RAW_LOG(WARNING, "%s", s);
  const char const_s[] = "const array";
  RAW_LOG(INFO, "%s", const_s);
  void* p = reinterpret_cast<void*>(PTR_TEST_VALUE);
  RAW_LOG(INFO, "ptr %p", p);
  p = NULL;
  RAW_LOG(INFO, "ptr %p", p);
  int j = 1000;
  RAW_LOG(ERROR, "%s%d%c%010d%s%1x", foo->c_str(), j, ' ', j, " ", j);
  RAW_VLOG(0, "foo %d", j);

#ifdef NDEBUG
  RAW_LOG(INFO, "foo %d", j);  // so that have same stderr to compare
#else
  RAW_DLOG(INFO, "foo %d", j);  // test RAW_DLOG in debug mode
#endif

  // test how long messages are chopped:
  RAW_LOG(WARNING, "Huge string: %s", huge_str.c_str());
  RAW_VLOG(0, "Huge string: %s", huge_str.c_str());

  FLAGS_v = 0;
  RAW_LOG(INFO, "log");
  RAW_VLOG(0, "vlog 0 on");
  RAW_VLOG(1, "vlog 1 off");
  RAW_VLOG(2, "vlog 2 off");
  RAW_VLOG(3, "vlog 3 off");
  FLAGS_v = 2;
  RAW_LOG(INFO, "log");
  RAW_VLOG(1, "vlog 1 on");
  RAW_VLOG(2, "vlog 2 on");
  RAW_VLOG(3, "vlog 3 off");

#ifdef NDEBUG
  RAW_DCHECK(1 == 2, " RAW_DCHECK's shouldn't be compiled in normal mode");
#endif

  RAW_CHECK(1 == 1, "should be ok");
  RAW_DCHECK(true, "should be ok");

  delete foo;
}

void LogWithLevels(int v, int severity, bool err, bool alsoerr) {
  RAW_LOG(INFO,
          "Test: v=%d stderrthreshold=%d logtostderr=%d alsologtostderr=%d",
          v, severity, err, alsoerr);

  FlagSaver saver;

  FLAGS_v = v;
  FLAGS_stderrthreshold = severity;
  FLAGS_logtostderr = err;
  FLAGS_alsologtostderr = alsoerr;

  RAW_VLOG(-1, "vlog -1");
  RAW_VLOG(0, "vlog 0");
  RAW_VLOG(1, "vlog 1");
  RAW_LOG(INFO, "log info");
  RAW_LOG(WARNING, "log warning");
  RAW_LOG(ERROR, "log error");

  VLOG(-1) << "vlog -1";
  VLOG(0) << "vlog 0";
  VLOG(1) << "vlog 1";
  LOG(INFO) << "log info";
  LOG(WARNING) << "log warning";
  LOG(ERROR) << "log error";

  VLOG_IF(-1, true) << "vlog_if -1";
  VLOG_IF(-1, false) << "don't vlog_if -1";
  VLOG_IF(0, true) << "vlog_if 0";
  VLOG_IF(0, false) << "don't vlog_if 0";
  VLOG_IF(1, true) << "vlog_if 1";
  VLOG_IF(1, false) << "don't vlog_if 1";
  LOG_IF(INFO, true) << "log_if info";
  LOG_IF(INFO, false) << "don't log_if info";
  LOG_IF(WARNING, true) << "log_if warning";
  LOG_IF(WARNING, false) << "don't log_if warning";
  LOG_IF(ERROR, true) << "log_if error";
  LOG_IF(ERROR, false) << "don't log_if error";

  int c;
  c = 1; VLOG_IF(100, c -= 2) << "vlog_if 100 expr"; EXPECT_EQ(c, -1);
  c = 1; VLOG_IF(0, c -= 2) << "vlog_if 0 expr"; EXPECT_EQ(c, -1);
  c = 1; LOG_IF(INFO, c -= 2) << "log_if info expr"; EXPECT_EQ(c, -1);
  c = 1; LOG_IF(ERROR, c -= 2) << "log_if error expr"; EXPECT_EQ(c, -1);
  c = 2; VLOG_IF(0, c -= 2) << "don't vlog_if 0 expr"; EXPECT_EQ(c, 0);
  c = 2; LOG_IF(ERROR, c -= 2) << "don't log_if error expr"; EXPECT_EQ(c, 0);

  c = 3; LOG_IF_EVERY_N(INFO, c -= 4, 1) << "log_if info every 1 expr";
  EXPECT_EQ(c, -1);
  c = 3; LOG_IF_EVERY_N(ERROR, c -= 4, 1) << "log_if error every 1 expr";
  EXPECT_EQ(c, -1);
  c = 4; LOG_IF_EVERY_N(ERROR, c -= 4, 3) << "don't log_if info every 3 expr";
  EXPECT_EQ(c, 0);
  c = 4; LOG_IF_EVERY_N(ERROR, c -= 4, 3) << "don't log_if error every 3 expr";
  EXPECT_EQ(c, 0);
  c = 5; VLOG_IF_EVERY_N(0, c -= 4, 1) << "vlog_if 0 every 1 expr";
  EXPECT_EQ(c, 1);
  c = 5; VLOG_IF_EVERY_N(100, c -= 4, 3) << "vlog_if 100 every 3 expr";
  EXPECT_EQ(c, 1);
  c = 6; VLOG_IF_EVERY_N(0, c -= 6, 1) << "don't vlog_if 0 every 1 expr";
  EXPECT_EQ(c, 0);
  c = 6; VLOG_IF_EVERY_N(100, c -= 6, 3) << "don't vlog_if 100 every 1 expr";
  EXPECT_EQ(c, 0);
}

void TestLoggingLevels() {
  LogWithLevels(0, GLOG_INFO, false, false);
  LogWithLevels(1, GLOG_INFO, false, false);
  LogWithLevels(-1, GLOG_INFO, false, false);
  LogWithLevels(0, GLOG_WARNING, false, false);
  LogWithLevels(0, GLOG_ERROR, false, false);
  LogWithLevels(0, GLOG_FATAL, false, false);
  LogWithLevels(0, GLOG_FATAL, true, false);
  LogWithLevels(0, GLOG_FATAL, false, true);
  LogWithLevels(1, GLOG_WARNING, false, false);
  LogWithLevels(1, GLOG_FATAL, false, true);
}

TEST(DeathRawCHECK, logging) {
  ASSERT_DEATH(RAW_CHECK(false, "failure 1"),
               "RAW: Check false failed: failure 1");
  ASSERT_DEBUG_DEATH(RAW_DCHECK(1 == 2, "failure 2"),
               "RAW: Check 1 == 2 failed: failure 2");
}

void TestLogString() {
  vector<string> errors;
  vector<string> *no_errors = NULL;

  LOG_STRING(INFO, &errors) << "LOG_STRING: " << "collected info";
  LOG_STRING(WARNING, &errors) << "LOG_STRING: " << "collected warning";
  LOG_STRING(ERROR, &errors) << "LOG_STRING: " << "collected error";

  LOG_STRING(INFO, no_errors) << "LOG_STRING: " << "reported info";
  LOG_STRING(WARNING, no_errors) << "LOG_STRING: " << "reported warning";
  LOG_STRING(ERROR, NULL) << "LOG_STRING: " << "reported error";

  for (size_t i = 0; i < errors.size(); ++i) {
    LOG(INFO) << "Captured by LOG_STRING:  " << errors[i];
  }
}

void TestLogToString() {
  string error;
  string* no_error = NULL;

  LOG_TO_STRING(INFO, &error) << "LOG_TO_STRING: " << "collected info";
  LOG(INFO) << "Captured by LOG_TO_STRING:  " << error;
  LOG_TO_STRING(WARNING, &error) << "LOG_TO_STRING: " << "collected warning";
  LOG(INFO) << "Captured by LOG_TO_STRING:  " << error;
  LOG_TO_STRING(ERROR, &error) << "LOG_TO_STRING: " << "collected error";
  LOG(INFO) << "Captured by LOG_TO_STRING:  " << error;

  LOG_TO_STRING(INFO, no_error) << "LOG_TO_STRING: " << "reported info";
  LOG_TO_STRING(WARNING, no_error) << "LOG_TO_STRING: " << "reported warning";
  LOG_TO_STRING(ERROR, NULL) << "LOG_TO_STRING: " << "reported error";
}

class TestLogSinkImpl : public LogSink {
 public:
  vector<string> errors;
  virtual void send(LogSeverity severity, const char* /* full_filename */,
                    const char* base_filename, int line,
                    const struct tm* tm_time,
                    const char* message, size_t message_len, int usecs) {
    errors.push_back(
      ToString(severity, base_filename, line, tm_time, message, message_len, usecs));
  }
  virtual void send(LogSeverity severity, const char* full_filename,
                    const char* base_filename, int line,
                    const struct tm* tm_time,
                    const char* message, size_t message_len) {
    send(severity, full_filename, base_filename, line,
         tm_time, message, message_len, 0);
  }
};

void TestLogSink() {
  TestLogSinkImpl sink;
  LogSink *no_sink = NULL;

  LOG_TO_SINK(&sink, INFO) << "LOG_TO_SINK: " << "collected info";
  LOG_TO_SINK(&sink, WARNING) << "LOG_TO_SINK: " << "collected warning";
  LOG_TO_SINK(&sink, ERROR) << "LOG_TO_SINK: " << "collected error";

  LOG_TO_SINK(no_sink, INFO) << "LOG_TO_SINK: " << "reported info";
  LOG_TO_SINK(no_sink, WARNING) << "LOG_TO_SINK: " << "reported warning";
  LOG_TO_SINK(NULL, ERROR) << "LOG_TO_SINK: " << "reported error";

  LOG_TO_SINK_BUT_NOT_TO_LOGFILE(&sink, INFO)
      << "LOG_TO_SINK_BUT_NOT_TO_LOGFILE: " << "collected info";
  LOG_TO_SINK_BUT_NOT_TO_LOGFILE(&sink, WARNING)
      << "LOG_TO_SINK_BUT_NOT_TO_LOGFILE: " << "collected warning";
  LOG_TO_SINK_BUT_NOT_TO_LOGFILE(&sink, ERROR)
      << "LOG_TO_SINK_BUT_NOT_TO_LOGFILE: " << "collected error";

  LOG_TO_SINK_BUT_NOT_TO_LOGFILE(no_sink, INFO)
      << "LOG_TO_SINK_BUT_NOT_TO_LOGFILE: " << "thrashed info";
  LOG_TO_SINK_BUT_NOT_TO_LOGFILE(no_sink, WARNING)
      << "LOG_TO_SINK_BUT_NOT_TO_LOGFILE: " << "thrashed warning";
  LOG_TO_SINK_BUT_NOT_TO_LOGFILE(NULL, ERROR)
      << "LOG_TO_SINK_BUT_NOT_TO_LOGFILE: " << "thrashed error";

  LOG(INFO) << "Captured by LOG_TO_SINK:";
  for (size_t i = 0; i < sink.errors.size(); ++i) {
    LogMessage("foo", LogMessage::kNoLogPrefix, GLOG_INFO).stream()
      << sink.errors[i];
  }
}

// For testing using CHECK*() on anonymous enums.
enum {
  CASE_A,
  CASE_B
};

void TestCHECK() {
  // Tests using CHECK*() on int values.
  CHECK(1 == 1);
  CHECK_EQ(1, 1);
  CHECK_NE(1, 2);
  CHECK_GE(1, 1);
  CHECK_GE(2, 1);
  CHECK_LE(1, 1);
  CHECK_LE(1, 2);
  CHECK_GT(2, 1);
  CHECK_LT(1, 2);

  // Tests using CHECK*() on anonymous enums.
  // Apple's GCC doesn't like this.
#if !defined(OS_MACOSX)
  CHECK_EQ(CASE_A, CASE_A);
  CHECK_NE(CASE_A, CASE_B);
  CHECK_GE(CASE_A, CASE_A);
  CHECK_GE(CASE_B, CASE_A);
  CHECK_LE(CASE_A, CASE_A);
  CHECK_LE(CASE_A, CASE_B);
  CHECK_GT(CASE_B, CASE_A);
  CHECK_LT(CASE_A, CASE_B);
#endif
}

void TestDCHECK() {
#ifdef NDEBUG
  DCHECK( 1 == 2 ) << " DCHECK's shouldn't be compiled in normal mode";
#endif
  DCHECK( 1 == 1 );
  DCHECK_EQ(1, 1);
  DCHECK_NE(1, 2);
  DCHECK_GE(1, 1);
  DCHECK_GE(2, 1);
  DCHECK_LE(1, 1);
  DCHECK_LE(1, 2);
  DCHECK_GT(2, 1);
  DCHECK_LT(1, 2);

  int64* orig_ptr = new int64;
  int64* ptr = DCHECK_NOTNULL(orig_ptr);
  CHECK_EQ(ptr, orig_ptr);
  delete orig_ptr;
}

void TestSTREQ() {
  CHECK_STREQ("this", "this");
  CHECK_STREQ(NULL, NULL);
  CHECK_STRCASEEQ("this", "tHiS");
  CHECK_STRCASEEQ(NULL, NULL);
  CHECK_STRNE("this", "tHiS");
  CHECK_STRNE("this", NULL);
  CHECK_STRCASENE("this", "that");
  CHECK_STRCASENE(NULL, "that");
  CHECK_STREQ((string("a")+"b").c_str(), "ab");
  CHECK_STREQ(string("test").c_str(),
              (string("te") + string("st")).c_str());
}

TEST(DeathSTREQ, logging) {
  ASSERT_DEATH(CHECK_STREQ(NULL, "this"), "");
  ASSERT_DEATH(CHECK_STREQ("this", "siht"), "");
  ASSERT_DEATH(CHECK_STRCASEEQ(NULL, "siht"), "");
  ASSERT_DEATH(CHECK_STRCASEEQ("this", "siht"), "");
  ASSERT_DEATH(CHECK_STRNE(NULL, NULL), "");
  ASSERT_DEATH(CHECK_STRNE("this", "this"), "");
  ASSERT_DEATH(CHECK_STREQ((string("a")+"b").c_str(), "abc"), "");
}

TEST(CheckNOTNULL, Simple) {
  int64 t;
  void *ptr = static_cast<void *>(&t);
  void *ref = CHECK_NOTNULL(ptr);
  EXPECT_EQ(ptr, ref);
  CHECK_NOTNULL(reinterpret_cast<char *>(ptr));
  CHECK_NOTNULL(reinterpret_cast<unsigned char *>(ptr));
  CHECK_NOTNULL(reinterpret_cast<int *>(ptr));
  CHECK_NOTNULL(reinterpret_cast<int64 *>(ptr));
}

TEST(DeathCheckNN, Simple) {
  ASSERT_DEATH(CHECK_NOTNULL(static_cast<void *>(NULL)), "");
}

// Get list of file names that match pattern
static void GetFiles(const string& pattern, vector<string>* files) {
  files->clear();
#if defined(HAVE_GLOB_H)
  glob_t g;
  const int r = glob(pattern.c_str(), 0, NULL, &g);
  CHECK((r == 0) || (r == GLOB_NOMATCH)) << ": error matching " << pattern;
  for (size_t i = 0; i < g.gl_pathc; i++) {
    files->push_back(string(g.gl_pathv[i]));
  }
  globfree(&g);
#elif defined(OS_WINDOWS)
  WIN32_FIND_DATAA data;
  HANDLE handle = FindFirstFileA(pattern.c_str(), &data);
  size_t index = pattern.rfind('\\');
  if (index == string::npos) {
    LOG(FATAL) << "No directory separator.";
  }
  const string dirname = pattern.substr(0, index + 1);
  if (handle == INVALID_HANDLE_VALUE) {
    // Finding no files is OK.
    return;
  }
  do {
    files->push_back(dirname + data.cFileName);
  } while (FindNextFileA(handle, &data));
  BOOL result = FindClose(handle);
  LOG_SYSRESULT(result);
#else
# error There is no way to do glob.
#endif
}

// Delete files patching pattern
static void DeleteFiles(const string& pattern) {
  vector<string> files;
  GetFiles(pattern, &files);
  for (size_t i = 0; i < files.size(); i++) {
    CHECK(unlink(files[i].c_str()) == 0) << ": " << strerror(errno);
  }
}

//check string is in file (or is *NOT*, depending on optional checkInFileOrNot)
static void CheckFile(const string& name, const string& expected_string, const bool checkInFileOrNot = true) {
  vector<string> files;
  GetFiles(name + "*", &files);
  CHECK_EQ(files.size(), 1UL);

  FILE* file = fopen(files[0].c_str(), "r");
  CHECK(file != NULL) << ": could not open " << files[0];
  char buf[1000];
  while (fgets(buf, sizeof(buf), file) != NULL) {
    char* first = strstr(buf, expected_string.c_str());
    //if first == NULL, not found.
    //Terser than if (checkInFileOrNot && first != NULL || !check...
    if (checkInFileOrNot != (first == NULL)) {
      fclose(file);
      return;
    }
  }
  fclose(file);
  LOG(FATAL) << "Did " << (checkInFileOrNot? "not " : "") << "find " << expected_string << " in " << files[0];
}

static void TestBasename() {
  fprintf(stderr, "==== Test setting log file basename\n");
  const string dest = FLAGS_test_tmpdir + "/logging_test_basename";
  DeleteFiles(dest + "*");

  SetLogDestination(GLOG_INFO, dest.c_str());
  LOG(INFO) << "message to new base";
  FlushLogFiles(GLOG_INFO);

  CheckFile(dest, "message to new base");

  // Release file handle for the destination file to unlock the file in Windows.
  LogToStderr();
  DeleteFiles(dest + "*");
}

static void TestBasenameAppendWhenNoTimestamp() {
  fprintf(stderr, "==== Test setting log file basename without timestamp and appending properly\n");
  const string dest = FLAGS_test_tmpdir + "/logging_test_basename_append_when_no_timestamp";
  DeleteFiles(dest + "*");

  ofstream out(dest.c_str());
  out << "test preexisting content" << endl;
  out.close();

  CheckFile(dest, "test preexisting content");

  FLAGS_timestamp_in_logfile_name=false;
  SetLogDestination(GLOG_INFO, dest.c_str());
  LOG(INFO) << "message to new base, appending to preexisting file";
  FlushLogFiles(GLOG_INFO);
  FLAGS_timestamp_in_logfile_name=true;

  //if the logging overwrites the file instead of appending it will fail.
  CheckFile(dest, "test preexisting content");
  CheckFile(dest, "message to new base, appending to preexisting file");

  // Release file handle for the destination file to unlock the file in Windows.
  LogToStderr();
  DeleteFiles(dest + "*");
}

static void TestTwoProcessesWrite() {
// test only implemented for platforms with fork & wait; the actual implementation relies on flock
#if defined(HAVE_SYS_WAIT_H) && defined(HAVE_UNISTD_H) && defined(HAVE_FCNTL)
  fprintf(stderr, "==== Test setting log file basename and two processes writing - second should fail\n");
  const string dest = FLAGS_test_tmpdir + "/logging_test_basename_two_processes_writing";
  DeleteFiles(dest + "*");

  //make both processes write into the same file (easier test)
  FLAGS_timestamp_in_logfile_name=false;
  SetLogDestination(GLOG_INFO, dest.c_str());
  LOG(INFO) << "message to new base, parent";
  FlushLogFiles(GLOG_INFO);

  pid_t pid = fork();
  CHECK_ERR(pid);
  if (pid == 0) {
    LOG(INFO) << "message to new base, child - should only appear on STDERR not on the file";
    ShutdownGoogleLogging(); //for children proc
    exit(0);
  } else if (pid > 0) {
    wait(NULL);
  }
  FLAGS_timestamp_in_logfile_name=true;

  CheckFile(dest, "message to new base, parent");
  CheckFile(dest, "message to new base, child - should only appear on STDERR not on the file", false);

  // Release
  LogToStderr();
  DeleteFiles(dest + "*");
#endif
}

static void TestSymlink() {
#ifndef OS_WINDOWS
  fprintf(stderr, "==== Test setting log file symlink\n");
  string dest = FLAGS_test_tmpdir + "/logging_test_symlink";
  string sym = FLAGS_test_tmpdir + "/symlinkbase";
  DeleteFiles(dest + "*");
  DeleteFiles(sym + "*");

  SetLogSymlink(GLOG_INFO, "symlinkbase");
  SetLogDestination(GLOG_INFO, dest.c_str());
  LOG(INFO) << "message to new symlink";
  FlushLogFiles(GLOG_INFO);
  CheckFile(sym, "message to new symlink");

  DeleteFiles(dest + "*");
  DeleteFiles(sym + "*");
#endif
}

static void TestExtension() {
  fprintf(stderr, "==== Test setting log file extension\n");
  string dest = FLAGS_test_tmpdir + "/logging_test_extension";
  DeleteFiles(dest + "*");

  SetLogDestination(GLOG_INFO, dest.c_str());
  SetLogFilenameExtension("specialextension");
  LOG(INFO) << "message to new extension";
  FlushLogFiles(GLOG_INFO);
  CheckFile(dest, "message to new extension");

  // Check that file name ends with extension
  vector<string> filenames;
  GetFiles(dest + "*", &filenames);
  CHECK_EQ(filenames.size(), 1UL);
  CHECK(strstr(filenames[0].c_str(), "specialextension") != NULL);

  // Release file handle for the destination file to unlock the file in Windows.
  LogToStderr();
  DeleteFiles(dest + "*");
}

struct MyLogger : public base::Logger {
  string data;

  virtual void Write(bool /* should_flush */,
                     time_t /* timestamp */,
                     const char* message,
                     int length) {
    data.append(message, length);
  }

  virtual void Flush() { }

  virtual uint32 LogSize() { return data.length(); }
};

static void TestWrapper() {
  fprintf(stderr, "==== Test log wrapper\n");

  MyLogger my_logger;
  base::Logger* old_logger = base::GetLogger(GLOG_INFO);
  base::SetLogger(GLOG_INFO, &my_logger);
  LOG(INFO) << "Send to wrapped logger";
  FlushLogFiles(GLOG_INFO);
  base::SetLogger(GLOG_INFO, old_logger);

  CHECK(strstr(my_logger.data.c_str(), "Send to wrapped logger") != NULL);
}

static void TestErrno() {
  fprintf(stderr, "==== Test errno preservation\n");

  errno = ENOENT;
  TestLogging(false);
  CHECK_EQ(errno, ENOENT);
}

static void TestOneTruncate(const char *path, int64 limit, int64 keep,
                            int64 dsize, int64 ksize, int64 expect) {
  int fd;
  CHECK_ERR(fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0600));

  const char *discardstr = "DISCARDME!", *keepstr = "KEEPME!";
  const size_t discard_size = strlen(discardstr), keep_size = strlen(keepstr);

  // Fill the file with the requested data; first discard data, then kept data
  int64 written = 0;
  while (written < dsize) {
    int bytes = min<int64>(dsize - written, discard_size);
    CHECK_ERR(write(fd, discardstr, bytes));
    written += bytes;
  }
  written = 0;
  while (written < ksize) {
    int bytes = min<int64>(ksize - written, keep_size);
    CHECK_ERR(write(fd, keepstr, bytes));
    written += bytes;
  }

  TruncateLogFile(path, limit, keep);

  // File should now be shorter
  struct stat statbuf;
  CHECK_ERR(fstat(fd, &statbuf));
  CHECK_EQ(statbuf.st_size, expect);
  CHECK_ERR(lseek(fd, 0, SEEK_SET));

  // File should contain the suffix of the original file
  const size_t buf_size = statbuf.st_size + 1;
  char* buf = new char[buf_size];
  memset(buf, 0, buf_size);
  CHECK_ERR(read(fd, buf, buf_size));

  const char *p = buf;
  int64 checked = 0;
  while (checked < expect) {
    int bytes = min<int64>(expect - checked, keep_size);
    CHECK(!memcmp(p, keepstr, bytes));
    checked += bytes;
  }
  close(fd);
  delete[] buf;
}

static void TestTruncate() {
#ifdef HAVE_UNISTD_H
  fprintf(stderr, "==== Test log truncation\n");
  string path = FLAGS_test_tmpdir + "/truncatefile";

  // Test on a small file
  TestOneTruncate(path.c_str(), 10, 10, 10, 10, 10);

  // And a big file (multiple blocks to copy)
  TestOneTruncate(path.c_str(), 2<<20, 4<<10, 3<<20, 4<<10, 4<<10);

  // Check edge-case limits
  TestOneTruncate(path.c_str(), 10, 20, 0, 20, 20);
  TestOneTruncate(path.c_str(), 10, 0, 0, 0, 0);
  TestOneTruncate(path.c_str(), 10, 50, 0, 10, 10);
  TestOneTruncate(path.c_str(), 50, 100, 0, 30, 30);

  // MacOSX 10.4 doesn't fail in this case.
  // Windows doesn't have symlink.
  // Let's just ignore this test for these cases.
#if !defined(OS_MACOSX) && !defined(OS_WINDOWS)
  // Through a symlink should fail to truncate
  string linkname = path + ".link";
  unlink(linkname.c_str());
  CHECK_ERR(symlink(path.c_str(), linkname.c_str()));
  TestOneTruncate(linkname.c_str(), 10, 10, 0, 30, 30);
#endif

  // The /proc/self path makes sense only for linux.
#if defined(OS_LINUX)
  // Through an open fd symlink should work
  int fd;
  CHECK_ERR(fd = open(path.c_str(), O_APPEND | O_WRONLY));
  char fdpath[64];
  snprintf(fdpath, sizeof(fdpath), "/proc/self/fd/%d", fd);
  TestOneTruncate(fdpath, 10, 10, 10, 10, 10);
#endif

#endif
}

struct RecordDeletionLogger : public base::Logger {
  RecordDeletionLogger(bool* set_on_destruction,
                       base::Logger* wrapped_logger) :
      set_on_destruction_(set_on_destruction),
      wrapped_logger_(wrapped_logger)
  {
    *set_on_destruction_ = false;
  }
  virtual ~RecordDeletionLogger() {
    *set_on_destruction_ = true;
  }
  virtual void Write(bool force_flush,
                     time_t timestamp,
                     const char* message,
                     int length) {
    wrapped_logger_->Write(force_flush, timestamp, message, length);
  }
  virtual void Flush() { wrapped_logger_->Flush(); }
  virtual uint32 LogSize() { return wrapped_logger_->LogSize(); }
 private:
  bool* set_on_destruction_;
  base::Logger* wrapped_logger_;
};

static void TestCustomLoggerDeletionOnShutdown() {
  bool custom_logger_deleted = false;
  base::SetLogger(GLOG_INFO,
                  new RecordDeletionLogger(&custom_logger_deleted,
                                           base::GetLogger(GLOG_INFO)));
  ShutdownGoogleLogging();
  EXPECT_TRUE(custom_logger_deleted);
}

_START_GOOGLE_NAMESPACE_
namespace glog_internal_namespace_ {
extern  // in logging.cc
bool SafeFNMatch_(const char* pattern, size_t patt_len,
                  const char* str, size_t str_len);
} // namespace glog_internal_namespace_
using glog_internal_namespace_::SafeFNMatch_;
_END_GOOGLE_NAMESPACE_

static bool WrapSafeFNMatch(string pattern, string str) {
  pattern += "abc";
  str += "defgh";
  return SafeFNMatch_(pattern.data(), pattern.size() - 3,
                      str.data(), str.size() - 5);
}

TEST(SafeFNMatch, logging) {
  CHECK(WrapSafeFNMatch("foo", "foo"));
  CHECK(!WrapSafeFNMatch("foo", "bar"));
  CHECK(!WrapSafeFNMatch("foo", "fo"));
  CHECK(!WrapSafeFNMatch("foo", "foo2"));
  CHECK(WrapSafeFNMatch("bar/foo.ext", "bar/foo.ext"));
  CHECK(WrapSafeFNMatch("*ba*r/fo*o.ext*", "bar/foo.ext"));
  CHECK(!WrapSafeFNMatch("bar/foo.ext", "bar/baz.ext"));
  CHECK(!WrapSafeFNMatch("bar/foo.ext", "bar/foo"));
  CHECK(!WrapSafeFNMatch("bar/foo.ext", "bar/foo.ext.zip"));
  CHECK(WrapSafeFNMatch("ba?/*.ext", "bar/foo.ext"));
  CHECK(WrapSafeFNMatch("ba?/*.ext", "baZ/FOO.ext"));
  CHECK(!WrapSafeFNMatch("ba?/*.ext", "barr/foo.ext"));
  CHECK(!WrapSafeFNMatch("ba?/*.ext", "bar/foo.ext2"));
  CHECK(WrapSafeFNMatch("ba?/*", "bar/foo.ext2"));
  CHECK(WrapSafeFNMatch("ba?/*", "bar/"));
  CHECK(!WrapSafeFNMatch("ba?/?", "bar/"));
  CHECK(!WrapSafeFNMatch("ba?/*", "bar"));
}

// TestWaitingLogSink will save messages here
// No lock: Accessed only by TestLogSinkWriter thread
// and after its demise by its creator.
static vector<string> global_messages;

// helper for TestWaitingLogSink below.
// Thread that does the logic of TestWaitingLogSink
// It's free to use LOG() itself.
class TestLogSinkWriter : public Thread {
 public:

  TestLogSinkWriter() : should_exit_(false) {
    SetJoinable(true);
    Start();
  }

  // Just buffer it (can't use LOG() here).
  void Buffer(const string& message) {
    mutex_.Lock();
    RAW_LOG(INFO, "Buffering");
    messages_.push(message);
    mutex_.Unlock();
    RAW_LOG(INFO, "Buffered");
  }

  // Wait for the buffer to clear (can't use LOG() here).
  void Wait() {
    RAW_LOG(INFO, "Waiting");
    mutex_.Lock();
    while (!NoWork()) {
      mutex_.Unlock();
      SleepForMilliseconds(1);
      mutex_.Lock();
    }
    RAW_LOG(INFO, "Waited");
    mutex_.Unlock();
  }

  // Trigger thread exit.
  void Stop() {
    MutexLock l(&mutex_);
    should_exit_ = true;
  }

 private:

  // helpers ---------------

  // For creating a "Condition".
  bool NoWork() { return messages_.empty(); }
  bool HaveWork() { return !messages_.empty() || should_exit_; }

  // Thread body; CAN use LOG() here!
  virtual void Run() {
    while (1) {
      mutex_.Lock();
      while (!HaveWork()) {
        mutex_.Unlock();
        SleepForMilliseconds(1);
        mutex_.Lock();
      }
      if (should_exit_ && messages_.empty()) {
        mutex_.Unlock();
        break;
      }
      // Give the main thread time to log its message,
      // so that we get a reliable log capture to compare to golden file.
      // Same for the other sleep below.
      SleepForMilliseconds(20);
      RAW_LOG(INFO, "Sink got a messages");  // only RAW_LOG under mutex_ here
      string message = messages_.front();
      messages_.pop();
      // Normally this would be some more real/involved logging logic
      // where LOG() usage can't be eliminated,
      // e.g. pushing the message over with an RPC:
      int messages_left = messages_.size();
      mutex_.Unlock();
      SleepForMilliseconds(20);
      // May not use LOG while holding mutex_, because Buffer()
      // acquires mutex_, and Buffer is called from LOG(),
      // which has its own internal mutex:
      // LOG()->LogToSinks()->TestWaitingLogSink::send()->Buffer()
      LOG(INFO) << "Sink is sending out a message: " << message;
      LOG(INFO) << "Have " << messages_left << " left";
      global_messages.push_back(message);
    }
  }

  // data ---------------

  Mutex mutex_;
  bool should_exit_;
  queue<string> messages_;  // messages to be logged
};

// A log sink that exercises WaitTillSent:
// it pushes data to a buffer and wakes up another thread to do the logging
// (that other thread can than use LOG() itself),
class TestWaitingLogSink : public LogSink {
 public:

  TestWaitingLogSink() {
    tid_ = pthread_self();  // for thread-specific behavior
    AddLogSink(this);
  }
  ~TestWaitingLogSink() {
    RemoveLogSink(this);
    writer_.Stop();
    writer_.Join();
  }

  // (re)define LogSink interface

  virtual void send(LogSeverity severity, const char* /* full_filename */,
                    const char* base_filename, int line,
                    const struct tm* tm_time,
                    const char* message, size_t message_len, int usecs) {
    // Push it to Writer thread if we are the original logging thread.
    // Note: Something like ThreadLocalLogSink is a better choice
    //       to do thread-specific LogSink logic for real.
    if (pthread_equal(tid_, pthread_self())) {
      writer_.Buffer(ToString(severity, base_filename, line,
                              tm_time, message, message_len, usecs));
    }
  }

  virtual void send(LogSeverity severity, const char* full_filename,
                    const char* base_filename, int line,
                    const struct tm* tm_time,
                    const char* message, size_t message_len) {
    send(severity, full_filename, base_filename, line, tm_time, message, message_len);
  }

  virtual void WaitTillSent() {
    // Wait for Writer thread if we are the original logging thread.
    if (pthread_equal(tid_, pthread_self()))  writer_.Wait();
  }

 private:

  pthread_t tid_;
  TestLogSinkWriter writer_;
};

// Check that LogSink::WaitTillSent can be used in the advertised way.
// We also do golden-stderr comparison.
static void TestLogSinkWaitTillSent() {
  { TestWaitingLogSink sink;
    // Sleeps give the sink threads time to do all their work,
    // so that we get a reliable log capture to compare to the golden file.
    LOG(INFO) << "Message 1";
    SleepForMilliseconds(60);
    LOG(ERROR) << "Message 2";
    SleepForMilliseconds(60);
    LOG(WARNING) << "Message 3";
    SleepForMilliseconds(60);
  }
  for (size_t i = 0; i < global_messages.size(); ++i) {
    LOG(INFO) << "Sink capture: " << global_messages[i];
  }
  CHECK_EQ(global_messages.size(), 3UL);
}

TEST(Strerror, logging) {
  int errcode = EINTR;
  char *msg = strdup(strerror(errcode));
  const size_t buf_size = strlen(msg) + 1;
  char *buf = new char[buf_size];
  CHECK_EQ(posix_strerror_r(errcode, NULL, 0), -1);
  buf[0] = 'A';
  CHECK_EQ(posix_strerror_r(errcode, buf, 0), -1);
  CHECK_EQ(buf[0], 'A');
  CHECK_EQ(posix_strerror_r(errcode, NULL, buf_size), -1);
#if defined(OS_MACOSX) || defined(OS_FREEBSD) || defined(OS_OPENBSD)
  // MacOSX or FreeBSD considers this case is an error since there is
  // no enough space.
  CHECK_EQ(posix_strerror_r(errcode, buf, 1), -1);
#else
  CHECK_EQ(posix_strerror_r(errcode, buf, 1), 0);
#endif
  CHECK_STREQ(buf, "");
  CHECK_EQ(posix_strerror_r(errcode, buf, buf_size), 0);
  CHECK_STREQ(buf, msg);
  delete[] buf;
  CHECK_EQ(msg, StrError(errcode));
  free(msg);
}

// Simple routines to look at the sizes of generated code for LOG(FATAL) and
// CHECK(..) via objdump
/*
static void MyFatal() {
  LOG(FATAL) << "Failed";
}
static void MyCheck(bool a, bool b) {
  CHECK_EQ(a, b);
}
*/
#ifdef HAVE_LIB_GMOCK

TEST(DVLog, Basic) {
  ScopedMockLog log;

#if NDEBUG
  // We are expecting that nothing is logged.
  EXPECT_CALL(log, Log(_, _, _)).Times(0);
#else
  EXPECT_CALL(log, Log(INFO, __FILE__, "debug log"));
#endif

  FLAGS_v = 1;
  DVLOG(1) << "debug log";
}

TEST(DVLog, V0) {
  ScopedMockLog log;

  // We are expecting that nothing is logged.
  EXPECT_CALL(log, Log(_, _, _)).Times(0);

  FLAGS_v = 0;
  DVLOG(1) << "debug log";
}

TEST(LogAtLevel, Basic) {
  ScopedMockLog log;

  // The function version outputs "logging.h" as a file name.
  EXPECT_CALL(log, Log(WARNING, StrNe(__FILE__), "function version"));
  EXPECT_CALL(log, Log(INFO, __FILE__, "macro version"));

  int severity = WARNING;
  LogAtLevel(severity, "function version");

  severity = INFO;
  // We can use the macro version as a C++ stream.
  LOG_AT_LEVEL(severity) << "macro" << ' ' << "version";
}

TEST(TestExitOnDFatal, ToBeOrNotToBe) {
  // Check the default setting...
  EXPECT_TRUE(base::internal::GetExitOnDFatal());

  // Turn off...
  base::internal::SetExitOnDFatal(false);
  EXPECT_FALSE(base::internal::GetExitOnDFatal());

  // We don't die.
  {
    ScopedMockLog log;
    //EXPECT_CALL(log, Log(_, _, _)).Times(AnyNumber());
    // LOG(DFATAL) has severity FATAL if debugging, but is
    // downgraded to ERROR if not debugging.
    const LogSeverity severity =
#ifdef NDEBUG
        ERROR;
#else
        FATAL;
#endif
    EXPECT_CALL(log, Log(severity, __FILE__, "This should not be fatal"));
    LOG(DFATAL) << "This should not be fatal";
  }

  // Turn back on...
  base::internal::SetExitOnDFatal(true);
  EXPECT_TRUE(base::internal::GetExitOnDFatal());

#ifdef GTEST_HAS_DEATH_TEST
  // Death comes on little cats' feet.
  EXPECT_DEBUG_DEATH({
      LOG(DFATAL) << "This should be fatal in debug mode";
    }, "This should be fatal in debug mode");
#endif
}

#ifdef HAVE_STACKTRACE

static void BacktraceAtHelper() {
  LOG(INFO) << "Not me";

// The vertical spacing of the next 3 lines is significant.
  LOG(INFO) << "Backtrace me";
}
static int kBacktraceAtLine = __LINE__ - 2;  // The line of the LOG(INFO) above

TEST(LogBacktraceAt, DoesNotBacktraceWhenDisabled) {
  StrictMock<ScopedMockLog> log;

  FLAGS_log_backtrace_at = "";

  EXPECT_CALL(log, Log(_, _, "Backtrace me"));
  EXPECT_CALL(log, Log(_, _, "Not me"));

  BacktraceAtHelper();
}

TEST(LogBacktraceAt, DoesBacktraceAtRightLineWhenEnabled) {
  StrictMock<ScopedMockLog> log;

  char where[100];
  snprintf(where, 100, "%s:%d", const_basename(__FILE__), kBacktraceAtLine);
  FLAGS_log_backtrace_at = where;

  // The LOG at the specified line should include a stacktrace which includes
  // the name of the containing function, followed by the log message.
  // We use HasSubstr()s instead of ContainsRegex() for environments
  // which don't have regexp.
  EXPECT_CALL(log, Log(_, _, AllOf(HasSubstr("stacktrace:"),
                                   HasSubstr("BacktraceAtHelper"),
                                   HasSubstr("main"),
                                   HasSubstr("Backtrace me"))));
  // Other LOGs should not include a backtrace.
  EXPECT_CALL(log, Log(_, _, "Not me"));

  BacktraceAtHelper();
}

#endif // HAVE_STACKTRACE

#endif // HAVE_LIB_GMOCK

struct UserDefinedClass {
  bool operator==(const UserDefinedClass&) const { return true; }
};

inline ostream& operator<<(ostream& out, const UserDefinedClass&) {
  out << "OK";
  return out;
}

TEST(UserDefinedClass, logging) {
  UserDefinedClass u;
  vector<string> buf;
  LOG_STRING(INFO, &buf) << u;
  CHECK_EQ(1UL, buf.size());
  CHECK(buf[0].find("OK") != string::npos);

  // We must be able to compile this.
  CHECK_EQ(u, u);
}