-
Notifications
You must be signed in to change notification settings - Fork 15
/
IPCThreadState.cpp
1293 lines (1117 loc) · 40.2 KB
/
IPCThreadState.cpp
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
/*
* Copyright (C) 2005 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "hw-IPCThreadState"
#include <hwbinder/IPCThreadState.h>
#include <hwbinder/Binder.h>
#include <hwbinder/BpHwBinder.h>
#include <hwbinder/TextOutput.h>
#include <hwbinder/binder_kernel.h>
#include <utils/Log.h>
#include <utils/SystemClock.h>
#include <utils/threads.h>
#include <private/binder/binder_module.h>
#include <hwbinder/Static.h>
#include <errno.h>
#include <inttypes.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/resource.h>
#include <unistd.h>
#if LOG_NDEBUG
#define IF_LOG_TRANSACTIONS() if (false)
#define IF_LOG_COMMANDS() if (false)
#define LOG_REMOTEREFS(...)
#define IF_LOG_REMOTEREFS() if (false)
#define LOG_THREADPOOL(...)
#define LOG_ONEWAY(...)
#else
#define IF_LOG_TRANSACTIONS() IF_ALOG(LOG_VERBOSE, "transact")
#define IF_LOG_COMMANDS() IF_ALOG(LOG_VERBOSE, "ipc")
#define LOG_REMOTEREFS(...) ALOG(LOG_DEBUG, "remoterefs", __VA_ARGS__)
#define IF_LOG_REMOTEREFS() IF_ALOG(LOG_DEBUG, "remoterefs")
#define LOG_THREADPOOL(...) ALOG(LOG_DEBUG, "threadpool", __VA_ARGS__)
#define LOG_ONEWAY(...) ALOG(LOG_DEBUG, "ipc", __VA_ARGS__)
#endif
// ---------------------------------------------------------------------------
namespace android {
namespace hardware {
// Static const and functions will be optimized out if not used,
// when LOG_NDEBUG and references in IF_LOG_COMMANDS() are optimized out.
static const char *kReturnStrings[] = {
"BR_ERROR",
"BR_OK",
"BR_TRANSACTION",
"BR_REPLY",
"BR_ACQUIRE_RESULT",
"BR_DEAD_REPLY",
"BR_TRANSACTION_COMPLETE",
"BR_INCREFS",
"BR_ACQUIRE",
"BR_RELEASE",
"BR_DECREFS",
"BR_ATTEMPT_ACQUIRE",
"BR_NOOP",
"BR_SPAWN_LOOPER",
"BR_FINISHED",
"BR_DEAD_BINDER",
"BR_CLEAR_DEATH_NOTIFICATION_DONE",
"BR_FAILED_REPLY",
"BR_TRANSACTION_SEC_CTX",
};
static const char *kCommandStrings[] = {
"BC_TRANSACTION",
"BC_REPLY",
"BC_ACQUIRE_RESULT",
"BC_FREE_BUFFER",
"BC_INCREFS",
"BC_ACQUIRE",
"BC_RELEASE",
"BC_DECREFS",
"BC_INCREFS_DONE",
"BC_ACQUIRE_DONE",
"BC_ATTEMPT_ACQUIRE",
"BC_REGISTER_LOOPER",
"BC_ENTER_LOOPER",
"BC_EXIT_LOOPER",
"BC_REQUEST_DEATH_NOTIFICATION",
"BC_CLEAR_DEATH_NOTIFICATION",
"BC_DEAD_BINDER_DONE"
};
static const char* getReturnString(size_t idx)
{
if (idx < sizeof(kReturnStrings) / sizeof(kReturnStrings[0]))
return kReturnStrings[idx];
else
return "unknown";
}
static const void* printBinderTransactionData(TextOutput& out, const void* data)
{
const binder_transaction_data* btd =
(const binder_transaction_data*)data;
if (btd->target.handle < 1024) {
/* want to print descriptors in decimal; guess based on value */
out << "target.desc=" << btd->target.handle;
} else {
out << "target.ptr=" << btd->target.ptr;
}
out << " (cookie " << btd->cookie << ")" << endl
<< "code=" << TypeCode(btd->code) << ", flags=" << (void*)(long)btd->flags << endl
<< "data=" << btd->data.ptr.buffer << " (" << (void*)btd->data_size
<< " bytes)" << endl
<< "offsets=" << btd->data.ptr.offsets << " (" << (void*)btd->offsets_size
<< " bytes)";
return btd+1;
}
static const void* printReturnCommand(TextOutput& out, const void* _cmd)
{
static const size_t N = sizeof(kReturnStrings)/sizeof(kReturnStrings[0]);
const int32_t* cmd = (const int32_t*)_cmd;
uint32_t code = (uint32_t)*cmd++;
size_t cmdIndex = code & 0xff;
if (code == BR_ERROR) {
out << "BR_ERROR: " << (void*)(long)(*cmd++) << endl;
return cmd;
} else if (cmdIndex >= N) {
out << "Unknown reply: " << code << endl;
return cmd;
}
out << kReturnStrings[cmdIndex];
switch (code) {
case BR_TRANSACTION:
case BR_REPLY: {
out << ": " << indent;
cmd = (const int32_t *)printBinderTransactionData(out, cmd);
out << dedent;
} break;
case BR_ACQUIRE_RESULT: {
const int32_t res = *cmd++;
out << ": " << res << (res ? " (SUCCESS)" : " (FAILURE)");
} break;
case BR_INCREFS:
case BR_ACQUIRE:
case BR_RELEASE:
case BR_DECREFS: {
const int32_t b = *cmd++;
const int32_t c = *cmd++;
out << ": target=" << (void*)(long)b << " (cookie " << (void*)(long)c << ")";
} break;
case BR_ATTEMPT_ACQUIRE: {
const int32_t p = *cmd++;
const int32_t b = *cmd++;
const int32_t c = *cmd++;
out << ": target=" << (void*)(long)b << " (cookie " << (void*)(long)c
<< "), pri=" << p;
} break;
case BR_DEAD_BINDER:
case BR_CLEAR_DEATH_NOTIFICATION_DONE: {
const int32_t c = *cmd++;
out << ": death cookie " << (void*)(long)c;
} break;
default:
// no details to show for: BR_OK, BR_DEAD_REPLY,
// BR_TRANSACTION_COMPLETE, BR_FINISHED
break;
}
out << endl;
return cmd;
}
static const void* printCommand(TextOutput& out, const void* _cmd)
{
static const size_t N = sizeof(kCommandStrings)/sizeof(kCommandStrings[0]);
const int32_t* cmd = (const int32_t*)_cmd;
uint32_t code = (uint32_t)*cmd++;
size_t cmdIndex = code & 0xff;
if (cmdIndex >= N) {
out << "Unknown command: " << code << endl;
return cmd;
}
out << kCommandStrings[cmdIndex];
switch (code) {
case BC_TRANSACTION:
case BC_REPLY: {
out << ": " << indent;
cmd = (const int32_t *)printBinderTransactionData(out, cmd);
out << dedent;
} break;
case BC_ACQUIRE_RESULT: {
const int32_t res = *cmd++;
out << ": " << res << (res ? " (SUCCESS)" : " (FAILURE)");
} break;
case BC_FREE_BUFFER: {
const int32_t buf = *cmd++;
out << ": buffer=" << (void*)(long)buf;
} break;
case BC_INCREFS:
case BC_ACQUIRE:
case BC_RELEASE:
case BC_DECREFS: {
const int32_t d = *cmd++;
out << ": desc=" << d;
} break;
case BC_INCREFS_DONE:
case BC_ACQUIRE_DONE: {
const int32_t b = *cmd++;
const int32_t c = *cmd++;
out << ": target=" << (void*)(long)b << " (cookie " << (void*)(long)c << ")";
} break;
case BC_ATTEMPT_ACQUIRE: {
const int32_t p = *cmd++;
const int32_t d = *cmd++;
out << ": desc=" << d << ", pri=" << p;
} break;
case BC_REQUEST_DEATH_NOTIFICATION:
case BC_CLEAR_DEATH_NOTIFICATION: {
const int32_t h = *cmd++;
const int32_t c = *cmd++;
out << ": handle=" << h << " (death cookie " << (void*)(long)c << ")";
} break;
case BC_DEAD_BINDER_DONE: {
const int32_t c = *cmd++;
out << ": death cookie " << (void*)(long)c;
} break;
default:
// no details to show for: BC_REGISTER_LOOPER, BC_ENTER_LOOPER,
// BC_EXIT_LOOPER
break;
}
out << endl;
return cmd;
}
static pthread_mutex_t gTLSMutex = PTHREAD_MUTEX_INITIALIZER;
static bool gHaveTLS = false;
static pthread_key_t gTLS = 0;
static bool gShutdown = false;
static bool gDisableBackgroundScheduling = false;
IPCThreadState* IPCThreadState::self()
{
if (gHaveTLS) {
restart:
const pthread_key_t k = gTLS;
IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k);
if (st) return st;
return new IPCThreadState;
}
if (gShutdown) {
ALOGW("Calling IPCThreadState::self() during shutdown is dangerous, expect a crash.\n");
return NULL;
}
pthread_mutex_lock(&gTLSMutex);
if (!gHaveTLS) {
int key_create_value = pthread_key_create(&gTLS, threadDestructor);
if (key_create_value != 0) {
pthread_mutex_unlock(&gTLSMutex);
ALOGW("IPCThreadState::self() unable to create TLS key, expect a crash: %s\n",
strerror(key_create_value));
return NULL;
}
gHaveTLS = true;
}
pthread_mutex_unlock(&gTLSMutex);
goto restart;
}
IPCThreadState* IPCThreadState::selfOrNull()
{
if (gHaveTLS) {
const pthread_key_t k = gTLS;
IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k);
return st;
}
return NULL;
}
void IPCThreadState::shutdown()
{
gShutdown = true;
if (gHaveTLS) {
// XXX Need to wait for all thread pool threads to exit!
IPCThreadState* st = (IPCThreadState*)pthread_getspecific(gTLS);
if (st) {
delete st;
pthread_setspecific(gTLS, NULL);
}
pthread_key_delete(gTLS);
gHaveTLS = false;
}
}
void IPCThreadState::disableBackgroundScheduling(bool disable)
{
gDisableBackgroundScheduling = disable;
}
sp<ProcessState> IPCThreadState::process()
{
return mProcess;
}
status_t IPCThreadState::clearLastError()
{
const status_t err = mLastError;
mLastError = NO_ERROR;
return err;
}
pid_t IPCThreadState::getCallingPid() const
{
return mCallingPid;
}
const char* IPCThreadState::getCallingSid() const
{
return mCallingSid;
}
uid_t IPCThreadState::getCallingUid() const
{
return mCallingUid;
}
int64_t IPCThreadState::clearCallingIdentity()
{
// ignore mCallingSid for legacy reasons
int64_t token = ((int64_t)mCallingUid<<32) | mCallingPid;
clearCaller();
return token;
}
void IPCThreadState::setStrictModePolicy(int32_t policy)
{
mStrictModePolicy = policy;
}
int32_t IPCThreadState::getStrictModePolicy() const
{
return mStrictModePolicy;
}
void IPCThreadState::setLastTransactionBinderFlags(int32_t flags)
{
mLastTransactionBinderFlags = flags;
}
int32_t IPCThreadState::getLastTransactionBinderFlags() const
{
return mLastTransactionBinderFlags;
}
void IPCThreadState::restoreCallingIdentity(int64_t token)
{
mCallingUid = (int)(token>>32);
mCallingSid = nullptr; // not enough data to restore
mCallingPid = (int)token;
}
void IPCThreadState::clearCaller()
{
mCallingPid = getpid();
mCallingSid = nullptr; // expensive to lookup
mCallingUid = getuid();
}
void IPCThreadState::flushCommands()
{
if (mProcess->mDriverFD <= 0)
return;
talkWithDriver(false);
// The flush could have caused post-write refcount decrements to have
// been executed, which in turn could result in BC_RELEASE/BC_DECREFS
// being queued in mOut. So flush again, if we need to.
if (mOut.dataSize() > 0) {
talkWithDriver(false);
}
if (mOut.dataSize() > 0) {
ALOGW("mOut.dataSize() > 0 after flushCommands()");
}
}
void IPCThreadState::blockUntilThreadAvailable()
{
pthread_mutex_lock(&mProcess->mThreadCountLock);
while (mProcess->mExecutingThreadsCount >= mProcess->mMaxThreads) {
ALOGW("Waiting for thread to be free. mExecutingThreadsCount=%lu mMaxThreads=%lu\n",
static_cast<unsigned long>(mProcess->mExecutingThreadsCount),
static_cast<unsigned long>(mProcess->mMaxThreads));
pthread_cond_wait(&mProcess->mThreadCountDecrement, &mProcess->mThreadCountLock);
}
pthread_mutex_unlock(&mProcess->mThreadCountLock);
}
status_t IPCThreadState::getAndExecuteCommand()
{
status_t result;
int32_t cmd;
result = talkWithDriver();
if (result >= NO_ERROR) {
size_t IN = mIn.dataAvail();
if (IN < sizeof(int32_t)) return result;
cmd = mIn.readInt32();
IF_LOG_COMMANDS() {
alog << "Processing top-level Command: "
<< getReturnString(cmd) << endl;
}
pthread_mutex_lock(&mProcess->mThreadCountLock);
mProcess->mExecutingThreadsCount++;
if (mProcess->mExecutingThreadsCount >= mProcess->mMaxThreads &&
mProcess->mMaxThreads > 1 && mProcess->mStarvationStartTimeMs == 0) {
mProcess->mStarvationStartTimeMs = uptimeMillis();
}
pthread_mutex_unlock(&mProcess->mThreadCountLock);
result = executeCommand(cmd);
pthread_mutex_lock(&mProcess->mThreadCountLock);
mProcess->mExecutingThreadsCount--;
if (mProcess->mExecutingThreadsCount < mProcess->mMaxThreads &&
mProcess->mStarvationStartTimeMs != 0) {
int64_t starvationTimeMs = uptimeMillis() - mProcess->mStarvationStartTimeMs;
if (starvationTimeMs > 100) {
// If there is only a single-threaded client, nobody would be blocked
// on this, and it's not really starvation. (see b/37647467)
ALOGW("All binder threads in pool (%zu threads) busy for %" PRId64 " ms%s",
mProcess->mMaxThreads, starvationTimeMs,
mProcess->mMaxThreads > 1 ? "" : " (may be a false alarm)");
}
mProcess->mStarvationStartTimeMs = 0;
}
pthread_cond_broadcast(&mProcess->mThreadCountDecrement);
pthread_mutex_unlock(&mProcess->mThreadCountLock);
}
return result;
}
// When we've cleared the incoming command queue, process any pending derefs
void IPCThreadState::processPendingDerefs()
{
if (mIn.dataPosition() >= mIn.dataSize()) {
/*
* The decWeak()/decStrong() calls may cause a destructor to run,
* which in turn could have initiated an outgoing transaction,
* which in turn could cause us to add to the pending refs
* vectors; so instead of simply iterating, loop until they're empty.
*
* We do this in an outer loop, because calling decStrong()
* may result in something being added to mPendingWeakDerefs,
* which could be delayed until the next incoming command
* from the driver if we don't process it now.
*/
while (mPendingWeakDerefs.size() > 0 || mPendingStrongDerefs.size() > 0) {
while (mPendingWeakDerefs.size() > 0) {
RefBase::weakref_type* refs = mPendingWeakDerefs[0];
mPendingWeakDerefs.removeAt(0);
refs->decWeak(mProcess.get());
}
if (mPendingStrongDerefs.size() > 0) {
// We don't use while() here because we don't want to re-order
// strong and weak decs at all; if this decStrong() causes both a
// decWeak() and a decStrong() to be queued, we want to process
// the decWeak() first.
BHwBinder* obj = mPendingStrongDerefs[0];
mPendingStrongDerefs.removeAt(0);
obj->decStrong(mProcess.get());
}
}
}
}
void IPCThreadState::processPostWriteDerefs()
{
/*
* libhwbinder has a flushCommands() in the BpHwBinder destructor,
* which makes this function (potentially) reentrant.
* New entries shouldn't be added though, so just iterating until empty
* should be safe.
*/
while (mPostWriteWeakDerefs.size() > 0) {
RefBase::weakref_type* refs = mPostWriteWeakDerefs[0];
mPostWriteWeakDerefs.removeAt(0);
refs->decWeak(mProcess.get());
}
while (mPostWriteStrongDerefs.size() > 0) {
RefBase* obj = mPostWriteStrongDerefs[0];
mPostWriteStrongDerefs.removeAt(0);
obj->decStrong(mProcess.get());
}
}
void IPCThreadState::joinThreadPool(bool isMain)
{
LOG_THREADPOOL("**** THREAD %p (PID %d) IS JOINING THE THREAD POOL\n", (void*)pthread_self(), getpid());
mOut.writeInt32(isMain ? BC_ENTER_LOOPER : BC_REGISTER_LOOPER);
status_t result;
mIsLooper = true;
do {
processPendingDerefs();
// now get the next command to be processed, waiting if necessary
result = getAndExecuteCommand();
if (result < NO_ERROR && result != TIMED_OUT && result != -ECONNREFUSED && result != -EBADF) {
ALOGE("getAndExecuteCommand(fd=%d) returned unexpected error %d, aborting",
mProcess->mDriverFD, result);
abort();
}
// Let this thread exit the thread pool if it is no longer
// needed and it is not the main process thread.
if(result == TIMED_OUT && !isMain) {
break;
}
} while (result != -ECONNREFUSED && result != -EBADF);
LOG_THREADPOOL("**** THREAD %p (PID %d) IS LEAVING THE THREAD POOL err=%d\n",
(void*)pthread_self(), getpid(), result);
mOut.writeInt32(BC_EXIT_LOOPER);
mIsLooper = false;
talkWithDriver(false);
}
int IPCThreadState::setupPolling(int* fd)
{
if (mProcess->mDriverFD <= 0) {
return -EBADF;
}
// Tells the kernel to not spawn any additional binder threads,
// as that won't work with polling. Also, the caller is responsible
// for subsequently calling handlePolledCommands()
mProcess->setThreadPoolConfiguration(1, true /* callerWillJoin */);
mIsPollingThread = true;
mOut.writeInt32(BC_ENTER_LOOPER);
*fd = mProcess->mDriverFD;
return 0;
}
status_t IPCThreadState::handlePolledCommands()
{
status_t result;
do {
result = getAndExecuteCommand();
} while (mIn.dataPosition() < mIn.dataSize());
processPendingDerefs();
flushCommands();
return result;
}
void IPCThreadState::stopProcess(bool /*immediate*/)
{
//ALOGI("**** STOPPING PROCESS");
flushCommands();
int fd = mProcess->mDriverFD;
mProcess->mDriverFD = -1;
close(fd);
//kill(getpid(), SIGKILL);
}
status_t IPCThreadState::transact(int32_t handle,
uint32_t code, const Parcel& data,
Parcel* reply, uint32_t flags)
{
status_t err;
flags |= TF_ACCEPT_FDS;
IF_LOG_TRANSACTIONS() {
alog << "BC_TRANSACTION thr " << (void*)pthread_self() << " / hand "
<< handle << " / code " << TypeCode(code) << ": "
<< indent << data << dedent << endl;
}
LOG_ONEWAY(">>>> SEND from pid %d uid %d %s", getpid(), getuid(),
(flags & TF_ONE_WAY) == 0 ? "READ REPLY" : "ONE WAY");
err = writeTransactionData(BC_TRANSACTION_SG, flags, handle, code, data, NULL);
if (err != NO_ERROR) {
if (reply) reply->setError(err);
return (mLastError = err);
}
if ((flags & TF_ONE_WAY) == 0) {
#if 0
if (code == 4) { // relayout
ALOGI(">>>>>> CALLING transaction 4");
} else {
ALOGI(">>>>>> CALLING transaction %d", code);
}
#endif
if (reply) {
err = waitForResponse(reply);
} else {
Parcel fakeReply;
err = waitForResponse(&fakeReply);
}
#if 0
if (code == 4) { // relayout
ALOGI("<<<<<< RETURNING transaction 4");
} else {
ALOGI("<<<<<< RETURNING transaction %d", code);
}
#endif
IF_LOG_TRANSACTIONS() {
alog << "BR_REPLY thr " << (void*)pthread_self() << " / hand "
<< handle << ": ";
if (reply) alog << indent << *reply << dedent << endl;
else alog << "(none requested)" << endl;
}
} else {
err = waitForResponse(NULL, NULL);
}
return err;
}
void IPCThreadState::incStrongHandle(int32_t handle, BpHwBinder *proxy)
{
LOG_REMOTEREFS("IPCThreadState::incStrongHandle(%d)\n", handle);
mOut.writeInt32(BC_ACQUIRE);
mOut.writeInt32(handle);
// Create a temp reference until the driver has handled this command.
proxy->incStrong(mProcess.get());
mPostWriteStrongDerefs.push(proxy);
}
void IPCThreadState::decStrongHandle(int32_t handle)
{
LOG_REMOTEREFS("IPCThreadState::decStrongHandle(%d)\n", handle);
mOut.writeInt32(BC_RELEASE);
mOut.writeInt32(handle);
}
void IPCThreadState::incWeakHandle(int32_t handle, BpHwBinder *proxy)
{
LOG_REMOTEREFS("IPCThreadState::incWeakHandle(%d)\n", handle);
mOut.writeInt32(BC_INCREFS);
mOut.writeInt32(handle);
// Create a temp reference until the driver has handled this command.
proxy->getWeakRefs()->incWeak(mProcess.get());
mPostWriteWeakDerefs.push(proxy->getWeakRefs());
}
void IPCThreadState::decWeakHandle(int32_t handle)
{
LOG_REMOTEREFS("IPCThreadState::decWeakHandle(%d)\n", handle);
mOut.writeInt32(BC_DECREFS);
mOut.writeInt32(handle);
}
status_t IPCThreadState::attemptIncStrongHandle(int32_t handle)
{
#if HAS_BC_ATTEMPT_ACQUIRE
LOG_REMOTEREFS("IPCThreadState::attemptIncStrongHandle(%d)\n", handle);
mOut.writeInt32(BC_ATTEMPT_ACQUIRE);
mOut.writeInt32(0); // xxx was thread priority
mOut.writeInt32(handle);
status_t result = UNKNOWN_ERROR;
waitForResponse(NULL, &result);
#if LOG_REFCOUNTS
printf("IPCThreadState::attemptIncStrongHandle(%ld) = %s\n",
handle, result == NO_ERROR ? "SUCCESS" : "FAILURE");
#endif
return result;
#else
(void)handle;
ALOGE("%s(%d): Not supported\n", __func__, handle);
return INVALID_OPERATION;
#endif
}
void IPCThreadState::expungeHandle(int32_t handle, IBinder* binder)
{
#if LOG_REFCOUNTS
printf("IPCThreadState::expungeHandle(%ld)\n", handle);
#endif
self()->mProcess->expungeHandle(handle, binder); // NOLINT
}
status_t IPCThreadState::requestDeathNotification(int32_t handle, BpHwBinder* proxy)
{
mOut.writeInt32(BC_REQUEST_DEATH_NOTIFICATION);
mOut.writeInt32((int32_t)handle);
mOut.writePointer((uintptr_t)proxy);
return NO_ERROR;
}
status_t IPCThreadState::clearDeathNotification(int32_t handle, BpHwBinder* proxy)
{
mOut.writeInt32(BC_CLEAR_DEATH_NOTIFICATION);
mOut.writeInt32((int32_t)handle);
mOut.writePointer((uintptr_t)proxy);
return NO_ERROR;
}
IPCThreadState::IPCThreadState()
: mProcess(ProcessState::self()),
mMyThreadId(gettid()),
mStrictModePolicy(0),
mLastTransactionBinderFlags(0),
mIsLooper(false),
mIsPollingThread(false) {
pthread_setspecific(gTLS, this);
clearCaller();
mIn.setDataCapacity(256);
mOut.setDataCapacity(256);
// TODO(b/67742352): remove this variable from the class
(void)mMyThreadId;
}
IPCThreadState::~IPCThreadState()
{
}
status_t IPCThreadState::sendReply(const Parcel& reply, uint32_t flags)
{
status_t err;
status_t statusBuffer;
err = writeTransactionData(BC_REPLY_SG, flags, -1, 0, reply, &statusBuffer);
if (err < NO_ERROR) return err;
return waitForResponse(NULL, NULL);
}
status_t IPCThreadState::waitForResponse(Parcel *reply, status_t *acquireResult)
{
uint32_t cmd;
int32_t err;
while (1) {
if ((err=talkWithDriver()) < NO_ERROR) break;
err = mIn.errorCheck();
if (err < NO_ERROR) break;
if (mIn.dataAvail() == 0) continue;
cmd = (uint32_t)mIn.readInt32();
IF_LOG_COMMANDS() {
alog << "Processing waitForResponse Command: "
<< getReturnString(cmd) << endl;
}
switch (cmd) {
case BR_TRANSACTION_COMPLETE:
if (!reply && !acquireResult) goto finish;
break;
case BR_DEAD_REPLY:
err = DEAD_OBJECT;
goto finish;
case BR_FAILED_REPLY:
err = FAILED_TRANSACTION;
goto finish;
case BR_ACQUIRE_RESULT:
{
ALOG_ASSERT(acquireResult != NULL, "Unexpected brACQUIRE_RESULT");
const int32_t result = mIn.readInt32();
if (!acquireResult) continue;
*acquireResult = result ? NO_ERROR : INVALID_OPERATION;
}
goto finish;
case BR_REPLY:
{
binder_transaction_data tr;
err = mIn.read(&tr, sizeof(tr));
ALOG_ASSERT(err == NO_ERROR, "Not enough command data for brREPLY");
if (err != NO_ERROR) goto finish;
if (reply) {
if ((tr.flags & TF_STATUS_CODE) == 0) {
reply->ipcSetDataReference(
reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
tr.data_size,
reinterpret_cast<const binder_size_t*>(tr.data.ptr.offsets),
tr.offsets_size/sizeof(binder_size_t),
freeBuffer, this);
} else {
err = *reinterpret_cast<const status_t*>(tr.data.ptr.buffer);
freeBuffer(NULL,
reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
tr.data_size,
reinterpret_cast<const binder_size_t*>(tr.data.ptr.offsets),
tr.offsets_size/sizeof(binder_size_t), this);
}
} else {
freeBuffer(NULL,
reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
tr.data_size,
reinterpret_cast<const binder_size_t*>(tr.data.ptr.offsets),
tr.offsets_size/sizeof(binder_size_t), this);
continue;
}
}
goto finish;
default:
err = executeCommand(cmd);
if (err != NO_ERROR) goto finish;
break;
}
}
finish:
if (err != NO_ERROR) {
if (acquireResult) *acquireResult = err;
if (reply) reply->setError(err);
mLastError = err;
}
return err;
}
status_t IPCThreadState::talkWithDriver(bool doReceive)
{
if (mProcess->mDriverFD <= 0) {
return -EBADF;
}
binder_write_read bwr;
// Is the read buffer empty?
const bool needRead = mIn.dataPosition() >= mIn.dataSize();
// We don't want to write anything if we are still reading
// from data left in the input buffer and the caller
// has requested to read the next data.
const size_t outAvail = (!doReceive || needRead) ? mOut.dataSize() : 0;
bwr.write_size = outAvail;
bwr.write_buffer = (uintptr_t)mOut.data();
// This is what we'll read.
if (doReceive && needRead) {
bwr.read_size = mIn.dataCapacity();
bwr.read_buffer = (uintptr_t)mIn.data();
} else {
bwr.read_size = 0;
bwr.read_buffer = 0;
}
IF_LOG_COMMANDS() {
if (outAvail != 0) {
alog << "Sending commands to driver: " << indent;
const void* cmds = (const void*)bwr.write_buffer;
const void* end = ((const uint8_t*)cmds)+bwr.write_size;
alog << HexDump(cmds, bwr.write_size) << endl;
while (cmds < end) cmds = printCommand(alog, cmds);
alog << dedent;
}
alog << "Size of receive buffer: " << bwr.read_size
<< ", needRead: " << needRead << ", doReceive: " << doReceive << endl;
}
// Return immediately if there is nothing to do.
if ((bwr.write_size == 0) && (bwr.read_size == 0)) return NO_ERROR;
bwr.write_consumed = 0;
bwr.read_consumed = 0;
status_t err;
do {
IF_LOG_COMMANDS() {
alog << "About to read/write, write size = " << mOut.dataSize() << endl;
}
#if defined(__ANDROID__)
if (ioctl(mProcess->mDriverFD, BINDER_WRITE_READ, &bwr) >= 0)
err = NO_ERROR;
else
err = -errno;
#else
err = INVALID_OPERATION;
#endif
if (mProcess->mDriverFD <= 0) {
err = -EBADF;
}
IF_LOG_COMMANDS() {
alog << "Finished read/write, write size = " << mOut.dataSize() << endl;
}
} while (err == -EINTR);
IF_LOG_COMMANDS() {
alog << "Our err: " << (void*)(intptr_t)err << ", write consumed: "
<< bwr.write_consumed << " (of " << mOut.dataSize()
<< "), read consumed: " << bwr.read_consumed << endl;
}
if (err >= NO_ERROR) {
if (bwr.write_consumed > 0) {
if (bwr.write_consumed < mOut.dataSize())
mOut.remove(0, bwr.write_consumed);
else {
mOut.setDataSize(0);
processPostWriteDerefs();
}
}
if (bwr.read_consumed > 0) {
mIn.setDataSize(bwr.read_consumed);
mIn.setDataPosition(0);
}
IF_LOG_COMMANDS() {
alog << "Remaining data size: " << mOut.dataSize() << endl;
alog << "Received commands from driver: " << indent;
const void* cmds = mIn.data();
const void* end = mIn.data() + mIn.dataSize();
alog << HexDump(cmds, mIn.dataSize()) << endl;
while (cmds < end) cmds = printReturnCommand(alog, cmds);
alog << dedent;
}
return NO_ERROR;
}
return err;
}
status_t IPCThreadState::writeTransactionData(int32_t cmd, uint32_t binderFlags,
int32_t handle, uint32_t code, const Parcel& data, status_t* statusBuffer)
{
binder_transaction_data_sg tr_sg;
/* Don't pass uninitialized stack data to a remote process */
tr_sg.transaction_data.target.ptr = 0;
tr_sg.transaction_data.target.handle = handle;
tr_sg.transaction_data.code = code;
tr_sg.transaction_data.flags = binderFlags;
tr_sg.transaction_data.cookie = 0;
tr_sg.transaction_data.sender_pid = 0;
tr_sg.transaction_data.sender_euid = 0;
const status_t err = data.errorCheck();
if (err == NO_ERROR) {
tr_sg.transaction_data.data_size = data.ipcDataSize();
tr_sg.transaction_data.data.ptr.buffer = data.ipcData();
tr_sg.transaction_data.offsets_size = data.ipcObjectsCount()*sizeof(binder_size_t);
tr_sg.transaction_data.data.ptr.offsets = data.ipcObjects();
tr_sg.buffers_size = data.ipcBufferSize();
} else if (statusBuffer) {
tr_sg.transaction_data.flags |= TF_STATUS_CODE;
*statusBuffer = err;
tr_sg.transaction_data.data_size = sizeof(status_t);
tr_sg.transaction_data.data.ptr.buffer = reinterpret_cast<uintptr_t>(statusBuffer);