1 /*
2 * Copyright (C) 2005 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "IPCThreadState"
18
19 #include <binder/IPCThreadState.h>
20
21 #include <binder/Binder.h>
22 #include <binder/BpBinder.h>
23 #include <cutils/sched_policy.h>
24 #include <utils/Debug.h>
25 #include <utils/Log.h>
26 #include <utils/TextOutput.h>
27 #include <utils/threads.h>
28
29 #include <private/binder/binder_module.h>
30 #include <private/binder/Static.h>
31
32 #include <sys/ioctl.h>
33 #include <signal.h>
34 #include <errno.h>
35 #include <stdio.h>
36 #include <unistd.h>
37
38 #ifdef HAVE_PTHREADS
39 #include <pthread.h>
40 #include <sched.h>
41 #include <sys/resource.h>
42 #endif
43 #ifdef HAVE_WIN32_THREADS
44 #include <windows.h>
45 #endif
46
47
48 #if LOG_NDEBUG
49
50 #define IF_LOG_TRANSACTIONS() if (false)
51 #define IF_LOG_COMMANDS() if (false)
52 #define LOG_REMOTEREFS(...)
53 #define IF_LOG_REMOTEREFS() if (false)
54 #define LOG_THREADPOOL(...)
55 #define LOG_ONEWAY(...)
56
57 #else
58
59 #define IF_LOG_TRANSACTIONS() IF_LOG(LOG_VERBOSE, "transact")
60 #define IF_LOG_COMMANDS() IF_LOG(LOG_VERBOSE, "ipc")
61 #define LOG_REMOTEREFS(...) LOG(LOG_DEBUG, "remoterefs", __VA_ARGS__)
62 #define IF_LOG_REMOTEREFS() IF_LOG(LOG_DEBUG, "remoterefs")
63 #define LOG_THREADPOOL(...) LOG(LOG_DEBUG, "threadpool", __VA_ARGS__)
64 #define LOG_ONEWAY(...) LOG(LOG_DEBUG, "ipc", __VA_ARGS__)
65
66 #endif
67
68 // ---------------------------------------------------------------------------
69
70 namespace android {
71
72 static const char* getReturnString(size_t idx);
73 static const char* getCommandString(size_t idx);
74 static const void* printReturnCommand(TextOutput& out, const void* _cmd);
75 static const void* printCommand(TextOutput& out, const void* _cmd);
76
77 // This will result in a missing symbol failure if the IF_LOG_COMMANDS()
78 // conditionals don't get stripped... but that is probably what we want.
79 #if !LOG_NDEBUG
80 static const char *kReturnStrings[] = {
81 "BR_ERROR",
82 "BR_OK",
83 "BR_TRANSACTION",
84 "BR_REPLY",
85 "BR_ACQUIRE_RESULT",
86 "BR_DEAD_REPLY",
87 "BR_TRANSACTION_COMPLETE",
88 "BR_INCREFS",
89 "BR_ACQUIRE",
90 "BR_RELEASE",
91 "BR_DECREFS",
92 "BR_ATTEMPT_ACQUIRE",
93 "BR_NOOP",
94 "BR_SPAWN_LOOPER",
95 "BR_FINISHED",
96 "BR_DEAD_BINDER",
97 "BR_CLEAR_DEATH_NOTIFICATION_DONE",
98 "BR_FAILED_REPLY"
99 };
100
101 static const char *kCommandStrings[] = {
102 "BC_TRANSACTION",
103 "BC_REPLY",
104 "BC_ACQUIRE_RESULT",
105 "BC_FREE_BUFFER",
106 "BC_INCREFS",
107 "BC_ACQUIRE",
108 "BC_RELEASE",
109 "BC_DECREFS",
110 "BC_INCREFS_DONE",
111 "BC_ACQUIRE_DONE",
112 "BC_ATTEMPT_ACQUIRE",
113 "BC_REGISTER_LOOPER",
114 "BC_ENTER_LOOPER",
115 "BC_EXIT_LOOPER",
116 "BC_REQUEST_DEATH_NOTIFICATION",
117 "BC_CLEAR_DEATH_NOTIFICATION",
118 "BC_DEAD_BINDER_DONE"
119 };
120
getReturnString(size_t idx)121 static const char* getReturnString(size_t idx)
122 {
123 if (idx < sizeof(kReturnStrings) / sizeof(kReturnStrings[0]))
124 return kReturnStrings[idx];
125 else
126 return "unknown";
127 }
128
getCommandString(size_t idx)129 static const char* getCommandString(size_t idx)
130 {
131 if (idx < sizeof(kCommandStrings) / sizeof(kCommandStrings[0]))
132 return kCommandStrings[idx];
133 else
134 return "unknown";
135 }
136
printBinderTransactionData(TextOutput & out,const void * data)137 static const void* printBinderTransactionData(TextOutput& out, const void* data)
138 {
139 const binder_transaction_data* btd =
140 (const binder_transaction_data*)data;
141 if (btd->target.handle < 1024) {
142 /* want to print descriptors in decimal; guess based on value */
143 out << "target.desc=" << btd->target.handle;
144 } else {
145 out << "target.ptr=" << btd->target.ptr;
146 }
147 out << " (cookie " << btd->cookie << ")" << endl
148 << "code=" << TypeCode(btd->code) << ", flags=" << (void*)btd->flags << endl
149 << "data=" << btd->data.ptr.buffer << " (" << (void*)btd->data_size
150 << " bytes)" << endl
151 << "offsets=" << btd->data.ptr.offsets << " (" << (void*)btd->offsets_size
152 << " bytes)";
153 return btd+1;
154 }
155
printReturnCommand(TextOutput & out,const void * _cmd)156 static const void* printReturnCommand(TextOutput& out, const void* _cmd)
157 {
158 static const size_t N = sizeof(kReturnStrings)/sizeof(kReturnStrings[0]);
159 const int32_t* cmd = (const int32_t*)_cmd;
160 int32_t code = *cmd++;
161 size_t cmdIndex = code & 0xff;
162 if (code == (int32_t) BR_ERROR) {
163 out << "BR_ERROR: " << (void*)(*cmd++) << endl;
164 return cmd;
165 } else if (cmdIndex >= N) {
166 out << "Unknown reply: " << code << endl;
167 return cmd;
168 }
169 out << kReturnStrings[cmdIndex];
170
171 switch (code) {
172 case BR_TRANSACTION:
173 case BR_REPLY: {
174 out << ": " << indent;
175 cmd = (const int32_t *)printBinderTransactionData(out, cmd);
176 out << dedent;
177 } break;
178
179 case BR_ACQUIRE_RESULT: {
180 const int32_t res = *cmd++;
181 out << ": " << res << (res ? " (SUCCESS)" : " (FAILURE)");
182 } break;
183
184 case BR_INCREFS:
185 case BR_ACQUIRE:
186 case BR_RELEASE:
187 case BR_DECREFS: {
188 const int32_t b = *cmd++;
189 const int32_t c = *cmd++;
190 out << ": target=" << (void*)b << " (cookie " << (void*)c << ")";
191 } break;
192
193 case BR_ATTEMPT_ACQUIRE: {
194 const int32_t p = *cmd++;
195 const int32_t b = *cmd++;
196 const int32_t c = *cmd++;
197 out << ": target=" << (void*)b << " (cookie " << (void*)c
198 << "), pri=" << p;
199 } break;
200
201 case BR_DEAD_BINDER:
202 case BR_CLEAR_DEATH_NOTIFICATION_DONE: {
203 const int32_t c = *cmd++;
204 out << ": death cookie " << (void*)c;
205 } break;
206
207 default:
208 // no details to show for: BR_OK, BR_DEAD_REPLY,
209 // BR_TRANSACTION_COMPLETE, BR_FINISHED
210 break;
211 }
212
213 out << endl;
214 return cmd;
215 }
216
printCommand(TextOutput & out,const void * _cmd)217 static const void* printCommand(TextOutput& out, const void* _cmd)
218 {
219 static const size_t N = sizeof(kCommandStrings)/sizeof(kCommandStrings[0]);
220 const int32_t* cmd = (const int32_t*)_cmd;
221 int32_t code = *cmd++;
222 size_t cmdIndex = code & 0xff;
223
224 if (cmdIndex >= N) {
225 out << "Unknown command: " << code << endl;
226 return cmd;
227 }
228 out << kCommandStrings[cmdIndex];
229
230 switch (code) {
231 case BC_TRANSACTION:
232 case BC_REPLY: {
233 out << ": " << indent;
234 cmd = (const int32_t *)printBinderTransactionData(out, cmd);
235 out << dedent;
236 } break;
237
238 case BC_ACQUIRE_RESULT: {
239 const int32_t res = *cmd++;
240 out << ": " << res << (res ? " (SUCCESS)" : " (FAILURE)");
241 } break;
242
243 case BC_FREE_BUFFER: {
244 const int32_t buf = *cmd++;
245 out << ": buffer=" << (void*)buf;
246 } break;
247
248 case BC_INCREFS:
249 case BC_ACQUIRE:
250 case BC_RELEASE:
251 case BC_DECREFS: {
252 const int32_t d = *cmd++;
253 out << ": desc=" << d;
254 } break;
255
256 case BC_INCREFS_DONE:
257 case BC_ACQUIRE_DONE: {
258 const int32_t b = *cmd++;
259 const int32_t c = *cmd++;
260 out << ": target=" << (void*)b << " (cookie " << (void*)c << ")";
261 } break;
262
263 case BC_ATTEMPT_ACQUIRE: {
264 const int32_t p = *cmd++;
265 const int32_t d = *cmd++;
266 out << ": desc=" << d << ", pri=" << p;
267 } break;
268
269 case BC_REQUEST_DEATH_NOTIFICATION:
270 case BC_CLEAR_DEATH_NOTIFICATION: {
271 const int32_t h = *cmd++;
272 const int32_t c = *cmd++;
273 out << ": handle=" << h << " (death cookie " << (void*)c << ")";
274 } break;
275
276 case BC_DEAD_BINDER_DONE: {
277 const int32_t c = *cmd++;
278 out << ": death cookie " << (void*)c;
279 } break;
280
281 default:
282 // no details to show for: BC_REGISTER_LOOPER, BC_ENTER_LOOPER,
283 // BC_EXIT_LOOPER
284 break;
285 }
286
287 out << endl;
288 return cmd;
289 }
290 #endif
291
292 static pthread_mutex_t gTLSMutex = PTHREAD_MUTEX_INITIALIZER;
293 static bool gHaveTLS = false;
294 static pthread_key_t gTLS = 0;
295 static bool gShutdown = false;
296 static bool gDisableBackgroundScheduling = false;
297
self()298 IPCThreadState* IPCThreadState::self()
299 {
300 if (gHaveTLS) {
301 restart:
302 const pthread_key_t k = gTLS;
303 IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k);
304 if (st) return st;
305 return new IPCThreadState;
306 }
307
308 if (gShutdown) return NULL;
309
310 pthread_mutex_lock(&gTLSMutex);
311 if (!gHaveTLS) {
312 if (pthread_key_create(&gTLS, threadDestructor) != 0) {
313 pthread_mutex_unlock(&gTLSMutex);
314 return NULL;
315 }
316 gHaveTLS = true;
317 }
318 pthread_mutex_unlock(&gTLSMutex);
319 goto restart;
320 }
321
selfOrNull()322 IPCThreadState* IPCThreadState::selfOrNull()
323 {
324 if (gHaveTLS) {
325 const pthread_key_t k = gTLS;
326 IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k);
327 return st;
328 }
329 return NULL;
330 }
331
shutdown()332 void IPCThreadState::shutdown()
333 {
334 gShutdown = true;
335
336 if (gHaveTLS) {
337 // XXX Need to wait for all thread pool threads to exit!
338 IPCThreadState* st = (IPCThreadState*)pthread_getspecific(gTLS);
339 if (st) {
340 delete st;
341 pthread_setspecific(gTLS, NULL);
342 }
343 gHaveTLS = false;
344 }
345 }
346
disableBackgroundScheduling(bool disable)347 void IPCThreadState::disableBackgroundScheduling(bool disable)
348 {
349 gDisableBackgroundScheduling = disable;
350 }
351
process()352 sp<ProcessState> IPCThreadState::process()
353 {
354 return mProcess;
355 }
356
clearLastError()357 status_t IPCThreadState::clearLastError()
358 {
359 const status_t err = mLastError;
360 mLastError = NO_ERROR;
361 return err;
362 }
363
getCallingPid()364 int IPCThreadState::getCallingPid()
365 {
366 return mCallingPid;
367 }
368
getCallingUid()369 int IPCThreadState::getCallingUid()
370 {
371 return mCallingUid;
372 }
373
clearCallingIdentity()374 int64_t IPCThreadState::clearCallingIdentity()
375 {
376 int64_t token = ((int64_t)mCallingUid<<32) | mCallingPid;
377 clearCaller();
378 return token;
379 }
380
setStrictModePolicy(int32_t policy)381 void IPCThreadState::setStrictModePolicy(int32_t policy)
382 {
383 mStrictModePolicy = policy;
384 }
385
getStrictModePolicy() const386 int32_t IPCThreadState::getStrictModePolicy() const
387 {
388 return mStrictModePolicy;
389 }
390
setLastTransactionBinderFlags(int32_t flags)391 void IPCThreadState::setLastTransactionBinderFlags(int32_t flags)
392 {
393 mLastTransactionBinderFlags = flags;
394 }
395
getLastTransactionBinderFlags() const396 int32_t IPCThreadState::getLastTransactionBinderFlags() const
397 {
398 return mLastTransactionBinderFlags;
399 }
400
restoreCallingIdentity(int64_t token)401 void IPCThreadState::restoreCallingIdentity(int64_t token)
402 {
403 mCallingUid = (int)(token>>32);
404 mCallingPid = (int)token;
405 }
406
clearCaller()407 void IPCThreadState::clearCaller()
408 {
409 mCallingPid = getpid();
410 mCallingUid = getuid();
411 }
412
flushCommands()413 void IPCThreadState::flushCommands()
414 {
415 if (mProcess->mDriverFD <= 0)
416 return;
417 talkWithDriver(false);
418 }
419
joinThreadPool(bool isMain)420 void IPCThreadState::joinThreadPool(bool isMain)
421 {
422 LOG_THREADPOOL("**** THREAD %p (PID %d) IS JOINING THE THREAD POOL\n", (void*)pthread_self(), getpid());
423
424 mOut.writeInt32(isMain ? BC_ENTER_LOOPER : BC_REGISTER_LOOPER);
425
426 // This thread may have been spawned by a thread that was in the background
427 // scheduling group, so first we will make sure it is in the default/foreground
428 // one to avoid performing an initial transaction in the background.
429 androidSetThreadSchedulingGroup(mMyThreadId, ANDROID_TGROUP_DEFAULT);
430
431 status_t result;
432 do {
433 int32_t cmd;
434
435 // When we've cleared the incoming command queue, process any pending derefs
436 if (mIn.dataPosition() >= mIn.dataSize()) {
437 size_t numPending = mPendingWeakDerefs.size();
438 if (numPending > 0) {
439 for (size_t i = 0; i < numPending; i++) {
440 RefBase::weakref_type* refs = mPendingWeakDerefs[i];
441 refs->decWeak(mProcess.get());
442 }
443 mPendingWeakDerefs.clear();
444 }
445
446 numPending = mPendingStrongDerefs.size();
447 if (numPending > 0) {
448 for (size_t i = 0; i < numPending; i++) {
449 BBinder* obj = mPendingStrongDerefs[i];
450 obj->decStrong(mProcess.get());
451 }
452 mPendingStrongDerefs.clear();
453 }
454 }
455
456 // now get the next command to be processed, waiting if necessary
457 result = talkWithDriver();
458 if (result >= NO_ERROR) {
459 size_t IN = mIn.dataAvail();
460 if (IN < sizeof(int32_t)) continue;
461 cmd = mIn.readInt32();
462 IF_LOG_COMMANDS() {
463 alog << "Processing top-level Command: "
464 << getReturnString(cmd) << endl;
465 }
466
467
468 result = executeCommand(cmd);
469 }
470
471 // After executing the command, ensure that the thread is returned to the
472 // default cgroup before rejoining the pool. The driver takes care of
473 // restoring the priority, but doesn't do anything with cgroups so we
474 // need to take care of that here in userspace. Note that we do make
475 // sure to go in the foreground after executing a transaction, but
476 // there are other callbacks into user code that could have changed
477 // our group so we want to make absolutely sure it is put back.
478 androidSetThreadSchedulingGroup(mMyThreadId, ANDROID_TGROUP_DEFAULT);
479
480 // Let this thread exit the thread pool if it is no longer
481 // needed and it is not the main process thread.
482 if(result == TIMED_OUT && !isMain) {
483 break;
484 }
485 } while (result != -ECONNREFUSED && result != -EBADF);
486
487 LOG_THREADPOOL("**** THREAD %p (PID %d) IS LEAVING THE THREAD POOL err=%p\n",
488 (void*)pthread_self(), getpid(), (void*)result);
489
490 mOut.writeInt32(BC_EXIT_LOOPER);
491 talkWithDriver(false);
492 }
493
stopProcess(bool immediate)494 void IPCThreadState::stopProcess(bool immediate)
495 {
496 //LOGI("**** STOPPING PROCESS");
497 flushCommands();
498 int fd = mProcess->mDriverFD;
499 mProcess->mDriverFD = -1;
500 close(fd);
501 //kill(getpid(), SIGKILL);
502 }
503
transact(int32_t handle,uint32_t code,const Parcel & data,Parcel * reply,uint32_t flags)504 status_t IPCThreadState::transact(int32_t handle,
505 uint32_t code, const Parcel& data,
506 Parcel* reply, uint32_t flags)
507 {
508 status_t err = data.errorCheck();
509
510 flags |= TF_ACCEPT_FDS;
511
512 IF_LOG_TRANSACTIONS() {
513 TextOutput::Bundle _b(alog);
514 alog << "BC_TRANSACTION thr " << (void*)pthread_self() << " / hand "
515 << handle << " / code " << TypeCode(code) << ": "
516 << indent << data << dedent << endl;
517 }
518
519 if (err == NO_ERROR) {
520 LOG_ONEWAY(">>>> SEND from pid %d uid %d %s", getpid(), getuid(),
521 (flags & TF_ONE_WAY) == 0 ? "READ REPLY" : "ONE WAY");
522 err = writeTransactionData(BC_TRANSACTION, flags, handle, code, data, NULL);
523 }
524
525 if (err != NO_ERROR) {
526 if (reply) reply->setError(err);
527 return (mLastError = err);
528 }
529
530 if ((flags & TF_ONE_WAY) == 0) {
531 #if 0
532 if (code == 4) { // relayout
533 LOGI(">>>>>> CALLING transaction 4");
534 } else {
535 LOGI(">>>>>> CALLING transaction %d", code);
536 }
537 #endif
538 if (reply) {
539 err = waitForResponse(reply);
540 } else {
541 Parcel fakeReply;
542 err = waitForResponse(&fakeReply);
543 }
544 #if 0
545 if (code == 4) { // relayout
546 LOGI("<<<<<< RETURNING transaction 4");
547 } else {
548 LOGI("<<<<<< RETURNING transaction %d", code);
549 }
550 #endif
551
552 IF_LOG_TRANSACTIONS() {
553 TextOutput::Bundle _b(alog);
554 alog << "BR_REPLY thr " << (void*)pthread_self() << " / hand "
555 << handle << ": ";
556 if (reply) alog << indent << *reply << dedent << endl;
557 else alog << "(none requested)" << endl;
558 }
559 } else {
560 err = waitForResponse(NULL, NULL);
561 }
562
563 return err;
564 }
565
incStrongHandle(int32_t handle)566 void IPCThreadState::incStrongHandle(int32_t handle)
567 {
568 LOG_REMOTEREFS("IPCThreadState::incStrongHandle(%d)\n", handle);
569 mOut.writeInt32(BC_ACQUIRE);
570 mOut.writeInt32(handle);
571 }
572
decStrongHandle(int32_t handle)573 void IPCThreadState::decStrongHandle(int32_t handle)
574 {
575 LOG_REMOTEREFS("IPCThreadState::decStrongHandle(%d)\n", handle);
576 mOut.writeInt32(BC_RELEASE);
577 mOut.writeInt32(handle);
578 }
579
incWeakHandle(int32_t handle)580 void IPCThreadState::incWeakHandle(int32_t handle)
581 {
582 LOG_REMOTEREFS("IPCThreadState::incWeakHandle(%d)\n", handle);
583 mOut.writeInt32(BC_INCREFS);
584 mOut.writeInt32(handle);
585 }
586
decWeakHandle(int32_t handle)587 void IPCThreadState::decWeakHandle(int32_t handle)
588 {
589 LOG_REMOTEREFS("IPCThreadState::decWeakHandle(%d)\n", handle);
590 mOut.writeInt32(BC_DECREFS);
591 mOut.writeInt32(handle);
592 }
593
attemptIncStrongHandle(int32_t handle)594 status_t IPCThreadState::attemptIncStrongHandle(int32_t handle)
595 {
596 LOG_REMOTEREFS("IPCThreadState::attemptIncStrongHandle(%d)\n", handle);
597 mOut.writeInt32(BC_ATTEMPT_ACQUIRE);
598 mOut.writeInt32(0); // xxx was thread priority
599 mOut.writeInt32(handle);
600 status_t result = UNKNOWN_ERROR;
601
602 waitForResponse(NULL, &result);
603
604 #if LOG_REFCOUNTS
605 printf("IPCThreadState::attemptIncStrongHandle(%ld) = %s\n",
606 handle, result == NO_ERROR ? "SUCCESS" : "FAILURE");
607 #endif
608
609 return result;
610 }
611
expungeHandle(int32_t handle,IBinder * binder)612 void IPCThreadState::expungeHandle(int32_t handle, IBinder* binder)
613 {
614 #if LOG_REFCOUNTS
615 printf("IPCThreadState::expungeHandle(%ld)\n", handle);
616 #endif
617 self()->mProcess->expungeHandle(handle, binder);
618 }
619
requestDeathNotification(int32_t handle,BpBinder * proxy)620 status_t IPCThreadState::requestDeathNotification(int32_t handle, BpBinder* proxy)
621 {
622 mOut.writeInt32(BC_REQUEST_DEATH_NOTIFICATION);
623 mOut.writeInt32((int32_t)handle);
624 mOut.writeInt32((int32_t)proxy);
625 return NO_ERROR;
626 }
627
clearDeathNotification(int32_t handle,BpBinder * proxy)628 status_t IPCThreadState::clearDeathNotification(int32_t handle, BpBinder* proxy)
629 {
630 mOut.writeInt32(BC_CLEAR_DEATH_NOTIFICATION);
631 mOut.writeInt32((int32_t)handle);
632 mOut.writeInt32((int32_t)proxy);
633 return NO_ERROR;
634 }
635
IPCThreadState()636 IPCThreadState::IPCThreadState()
637 : mProcess(ProcessState::self()),
638 mMyThreadId(androidGetTid()),
639 mStrictModePolicy(0),
640 mLastTransactionBinderFlags(0)
641 {
642 pthread_setspecific(gTLS, this);
643 clearCaller();
644 mIn.setDataCapacity(256);
645 mOut.setDataCapacity(256);
646 }
647
~IPCThreadState()648 IPCThreadState::~IPCThreadState()
649 {
650 }
651
sendReply(const Parcel & reply,uint32_t flags)652 status_t IPCThreadState::sendReply(const Parcel& reply, uint32_t flags)
653 {
654 status_t err;
655 status_t statusBuffer;
656 err = writeTransactionData(BC_REPLY, flags, -1, 0, reply, &statusBuffer);
657 if (err < NO_ERROR) return err;
658
659 return waitForResponse(NULL, NULL);
660 }
661
waitForResponse(Parcel * reply,status_t * acquireResult)662 status_t IPCThreadState::waitForResponse(Parcel *reply, status_t *acquireResult)
663 {
664 int32_t cmd;
665 int32_t err;
666
667 while (1) {
668 if ((err=talkWithDriver()) < NO_ERROR) break;
669 err = mIn.errorCheck();
670 if (err < NO_ERROR) break;
671 if (mIn.dataAvail() == 0) continue;
672
673 cmd = mIn.readInt32();
674
675 IF_LOG_COMMANDS() {
676 alog << "Processing waitForResponse Command: "
677 << getReturnString(cmd) << endl;
678 }
679
680 switch (cmd) {
681 case BR_TRANSACTION_COMPLETE:
682 if (!reply && !acquireResult) goto finish;
683 break;
684
685 case BR_DEAD_REPLY:
686 err = DEAD_OBJECT;
687 goto finish;
688
689 case BR_FAILED_REPLY:
690 err = FAILED_TRANSACTION;
691 goto finish;
692
693 case BR_ACQUIRE_RESULT:
694 {
695 LOG_ASSERT(acquireResult != NULL, "Unexpected brACQUIRE_RESULT");
696 const int32_t result = mIn.readInt32();
697 if (!acquireResult) continue;
698 *acquireResult = result ? NO_ERROR : INVALID_OPERATION;
699 }
700 goto finish;
701
702 case BR_REPLY:
703 {
704 binder_transaction_data tr;
705 err = mIn.read(&tr, sizeof(tr));
706 LOG_ASSERT(err == NO_ERROR, "Not enough command data for brREPLY");
707 if (err != NO_ERROR) goto finish;
708
709 if (reply) {
710 if ((tr.flags & TF_STATUS_CODE) == 0) {
711 reply->ipcSetDataReference(
712 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
713 tr.data_size,
714 reinterpret_cast<const size_t*>(tr.data.ptr.offsets),
715 tr.offsets_size/sizeof(size_t),
716 freeBuffer, this);
717 } else {
718 err = *static_cast<const status_t*>(tr.data.ptr.buffer);
719 freeBuffer(NULL,
720 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
721 tr.data_size,
722 reinterpret_cast<const size_t*>(tr.data.ptr.offsets),
723 tr.offsets_size/sizeof(size_t), this);
724 }
725 } else {
726 freeBuffer(NULL,
727 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
728 tr.data_size,
729 reinterpret_cast<const size_t*>(tr.data.ptr.offsets),
730 tr.offsets_size/sizeof(size_t), this);
731 continue;
732 }
733 }
734 goto finish;
735
736 default:
737 err = executeCommand(cmd);
738 if (err != NO_ERROR) goto finish;
739 break;
740 }
741 }
742
743 finish:
744 if (err != NO_ERROR) {
745 if (acquireResult) *acquireResult = err;
746 if (reply) reply->setError(err);
747 mLastError = err;
748 }
749
750 return err;
751 }
752
talkWithDriver(bool doReceive)753 status_t IPCThreadState::talkWithDriver(bool doReceive)
754 {
755 LOG_ASSERT(mProcess->mDriverFD >= 0, "Binder driver is not opened");
756
757 binder_write_read bwr;
758
759 // Is the read buffer empty?
760 const bool needRead = mIn.dataPosition() >= mIn.dataSize();
761
762 // We don't want to write anything if we are still reading
763 // from data left in the input buffer and the caller
764 // has requested to read the next data.
765 const size_t outAvail = (!doReceive || needRead) ? mOut.dataSize() : 0;
766
767 bwr.write_size = outAvail;
768 bwr.write_buffer = (long unsigned int)mOut.data();
769
770 // This is what we'll read.
771 if (doReceive && needRead) {
772 bwr.read_size = mIn.dataCapacity();
773 bwr.read_buffer = (long unsigned int)mIn.data();
774 } else {
775 bwr.read_size = 0;
776 }
777
778 IF_LOG_COMMANDS() {
779 TextOutput::Bundle _b(alog);
780 if (outAvail != 0) {
781 alog << "Sending commands to driver: " << indent;
782 const void* cmds = (const void*)bwr.write_buffer;
783 const void* end = ((const uint8_t*)cmds)+bwr.write_size;
784 alog << HexDump(cmds, bwr.write_size) << endl;
785 while (cmds < end) cmds = printCommand(alog, cmds);
786 alog << dedent;
787 }
788 alog << "Size of receive buffer: " << bwr.read_size
789 << ", needRead: " << needRead << ", doReceive: " << doReceive << endl;
790 }
791
792 // Return immediately if there is nothing to do.
793 if ((bwr.write_size == 0) && (bwr.read_size == 0)) return NO_ERROR;
794
795 bwr.write_consumed = 0;
796 bwr.read_consumed = 0;
797 status_t err;
798 do {
799 IF_LOG_COMMANDS() {
800 alog << "About to read/write, write size = " << mOut.dataSize() << endl;
801 }
802 #if defined(HAVE_ANDROID_OS)
803 if (ioctl(mProcess->mDriverFD, BINDER_WRITE_READ, &bwr) >= 0)
804 err = NO_ERROR;
805 else
806 err = -errno;
807 #else
808 err = INVALID_OPERATION;
809 #endif
810 IF_LOG_COMMANDS() {
811 alog << "Finished read/write, write size = " << mOut.dataSize() << endl;
812 }
813 } while (err == -EINTR);
814
815 IF_LOG_COMMANDS() {
816 alog << "Our err: " << (void*)err << ", write consumed: "
817 << bwr.write_consumed << " (of " << mOut.dataSize()
818 << "), read consumed: " << bwr.read_consumed << endl;
819 }
820
821 if (err >= NO_ERROR) {
822 if (bwr.write_consumed > 0) {
823 if (bwr.write_consumed < (ssize_t)mOut.dataSize())
824 mOut.remove(0, bwr.write_consumed);
825 else
826 mOut.setDataSize(0);
827 }
828 if (bwr.read_consumed > 0) {
829 mIn.setDataSize(bwr.read_consumed);
830 mIn.setDataPosition(0);
831 }
832 IF_LOG_COMMANDS() {
833 TextOutput::Bundle _b(alog);
834 alog << "Remaining data size: " << mOut.dataSize() << endl;
835 alog << "Received commands from driver: " << indent;
836 const void* cmds = mIn.data();
837 const void* end = mIn.data() + mIn.dataSize();
838 alog << HexDump(cmds, mIn.dataSize()) << endl;
839 while (cmds < end) cmds = printReturnCommand(alog, cmds);
840 alog << dedent;
841 }
842 return NO_ERROR;
843 }
844
845 return err;
846 }
847
writeTransactionData(int32_t cmd,uint32_t binderFlags,int32_t handle,uint32_t code,const Parcel & data,status_t * statusBuffer)848 status_t IPCThreadState::writeTransactionData(int32_t cmd, uint32_t binderFlags,
849 int32_t handle, uint32_t code, const Parcel& data, status_t* statusBuffer)
850 {
851 binder_transaction_data tr;
852
853 tr.target.handle = handle;
854 tr.code = code;
855 tr.flags = binderFlags;
856 tr.cookie = 0;
857 tr.sender_pid = 0;
858 tr.sender_euid = 0;
859
860 const status_t err = data.errorCheck();
861 if (err == NO_ERROR) {
862 tr.data_size = data.ipcDataSize();
863 tr.data.ptr.buffer = data.ipcData();
864 tr.offsets_size = data.ipcObjectsCount()*sizeof(size_t);
865 tr.data.ptr.offsets = data.ipcObjects();
866 } else if (statusBuffer) {
867 tr.flags |= TF_STATUS_CODE;
868 *statusBuffer = err;
869 tr.data_size = sizeof(status_t);
870 tr.data.ptr.buffer = statusBuffer;
871 tr.offsets_size = 0;
872 tr.data.ptr.offsets = NULL;
873 } else {
874 return (mLastError = err);
875 }
876
877 mOut.writeInt32(cmd);
878 mOut.write(&tr, sizeof(tr));
879
880 return NO_ERROR;
881 }
882
883 sp<BBinder> the_context_object;
884
setTheContextObject(sp<BBinder> obj)885 void setTheContextObject(sp<BBinder> obj)
886 {
887 the_context_object = obj;
888 }
889
executeCommand(int32_t cmd)890 status_t IPCThreadState::executeCommand(int32_t cmd)
891 {
892 BBinder* obj;
893 RefBase::weakref_type* refs;
894 status_t result = NO_ERROR;
895
896 switch (cmd) {
897 case BR_ERROR:
898 result = mIn.readInt32();
899 break;
900
901 case BR_OK:
902 break;
903
904 case BR_ACQUIRE:
905 refs = (RefBase::weakref_type*)mIn.readInt32();
906 obj = (BBinder*)mIn.readInt32();
907 LOG_ASSERT(refs->refBase() == obj,
908 "BR_ACQUIRE: object %p does not match cookie %p (expected %p)",
909 refs, obj, refs->refBase());
910 obj->incStrong(mProcess.get());
911 IF_LOG_REMOTEREFS() {
912 LOG_REMOTEREFS("BR_ACQUIRE from driver on %p", obj);
913 obj->printRefs();
914 }
915 mOut.writeInt32(BC_ACQUIRE_DONE);
916 mOut.writeInt32((int32_t)refs);
917 mOut.writeInt32((int32_t)obj);
918 break;
919
920 case BR_RELEASE:
921 refs = (RefBase::weakref_type*)mIn.readInt32();
922 obj = (BBinder*)mIn.readInt32();
923 LOG_ASSERT(refs->refBase() == obj,
924 "BR_RELEASE: object %p does not match cookie %p (expected %p)",
925 refs, obj, refs->refBase());
926 IF_LOG_REMOTEREFS() {
927 LOG_REMOTEREFS("BR_RELEASE from driver on %p", obj);
928 obj->printRefs();
929 }
930 mPendingStrongDerefs.push(obj);
931 break;
932
933 case BR_INCREFS:
934 refs = (RefBase::weakref_type*)mIn.readInt32();
935 obj = (BBinder*)mIn.readInt32();
936 refs->incWeak(mProcess.get());
937 mOut.writeInt32(BC_INCREFS_DONE);
938 mOut.writeInt32((int32_t)refs);
939 mOut.writeInt32((int32_t)obj);
940 break;
941
942 case BR_DECREFS:
943 refs = (RefBase::weakref_type*)mIn.readInt32();
944 obj = (BBinder*)mIn.readInt32();
945 // NOTE: This assertion is not valid, because the object may no
946 // longer exist (thus the (BBinder*)cast above resulting in a different
947 // memory address).
948 //LOG_ASSERT(refs->refBase() == obj,
949 // "BR_DECREFS: object %p does not match cookie %p (expected %p)",
950 // refs, obj, refs->refBase());
951 mPendingWeakDerefs.push(refs);
952 break;
953
954 case BR_ATTEMPT_ACQUIRE:
955 refs = (RefBase::weakref_type*)mIn.readInt32();
956 obj = (BBinder*)mIn.readInt32();
957
958 {
959 const bool success = refs->attemptIncStrong(mProcess.get());
960 LOG_ASSERT(success && refs->refBase() == obj,
961 "BR_ATTEMPT_ACQUIRE: object %p does not match cookie %p (expected %p)",
962 refs, obj, refs->refBase());
963
964 mOut.writeInt32(BC_ACQUIRE_RESULT);
965 mOut.writeInt32((int32_t)success);
966 }
967 break;
968
969 case BR_TRANSACTION:
970 {
971 binder_transaction_data tr;
972 result = mIn.read(&tr, sizeof(tr));
973 LOG_ASSERT(result == NO_ERROR,
974 "Not enough command data for brTRANSACTION");
975 if (result != NO_ERROR) break;
976
977 Parcel buffer;
978 buffer.ipcSetDataReference(
979 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer),
980 tr.data_size,
981 reinterpret_cast<const size_t*>(tr.data.ptr.offsets),
982 tr.offsets_size/sizeof(size_t), freeBuffer, this);
983
984 const pid_t origPid = mCallingPid;
985 const uid_t origUid = mCallingUid;
986
987 mCallingPid = tr.sender_pid;
988 mCallingUid = tr.sender_euid;
989
990 int curPrio = getpriority(PRIO_PROCESS, mMyThreadId);
991 if (gDisableBackgroundScheduling) {
992 if (curPrio > ANDROID_PRIORITY_NORMAL) {
993 // We have inherited a reduced priority from the caller, but do not
994 // want to run in that state in this process. The driver set our
995 // priority already (though not our scheduling class), so bounce
996 // it back to the default before invoking the transaction.
997 setpriority(PRIO_PROCESS, mMyThreadId, ANDROID_PRIORITY_NORMAL);
998 }
999 } else {
1000 if (curPrio >= ANDROID_PRIORITY_BACKGROUND) {
1001 // We want to use the inherited priority from the caller.
1002 // Ensure this thread is in the background scheduling class,
1003 // since the driver won't modify scheduling classes for us.
1004 // The scheduling group is reset to default by the caller
1005 // once this method returns after the transaction is complete.
1006 androidSetThreadSchedulingGroup(mMyThreadId,
1007 ANDROID_TGROUP_BG_NONINTERACT);
1008 }
1009 }
1010
1011 //LOGI(">>>> TRANSACT from pid %d uid %d\n", mCallingPid, mCallingUid);
1012
1013 Parcel reply;
1014 IF_LOG_TRANSACTIONS() {
1015 TextOutput::Bundle _b(alog);
1016 alog << "BR_TRANSACTION thr " << (void*)pthread_self()
1017 << " / obj " << tr.target.ptr << " / code "
1018 << TypeCode(tr.code) << ": " << indent << buffer
1019 << dedent << endl
1020 << "Data addr = "
1021 << reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer)
1022 << ", offsets addr="
1023 << reinterpret_cast<const size_t*>(tr.data.ptr.offsets) << endl;
1024 }
1025 if (tr.target.ptr) {
1026 sp<BBinder> b((BBinder*)tr.cookie);
1027 const status_t error = b->transact(tr.code, buffer, &reply, tr.flags);
1028 if (error < NO_ERROR) reply.setError(error);
1029
1030 } else {
1031 const status_t error = the_context_object->transact(tr.code, buffer, &reply, tr.flags);
1032 if (error < NO_ERROR) reply.setError(error);
1033 }
1034
1035 //LOGI("<<<< TRANSACT from pid %d restore pid %d uid %d\n",
1036 // mCallingPid, origPid, origUid);
1037
1038 if ((tr.flags & TF_ONE_WAY) == 0) {
1039 LOG_ONEWAY("Sending reply to %d!", mCallingPid);
1040 sendReply(reply, 0);
1041 } else {
1042 LOG_ONEWAY("NOT sending reply to %d!", mCallingPid);
1043 }
1044
1045 mCallingPid = origPid;
1046 mCallingUid = origUid;
1047
1048 IF_LOG_TRANSACTIONS() {
1049 TextOutput::Bundle _b(alog);
1050 alog << "BC_REPLY thr " << (void*)pthread_self() << " / obj "
1051 << tr.target.ptr << ": " << indent << reply << dedent << endl;
1052 }
1053
1054 }
1055 break;
1056
1057 case BR_DEAD_BINDER:
1058 {
1059 BpBinder *proxy = (BpBinder*)mIn.readInt32();
1060 proxy->sendObituary();
1061 mOut.writeInt32(BC_DEAD_BINDER_DONE);
1062 mOut.writeInt32((int32_t)proxy);
1063 } break;
1064
1065 case BR_CLEAR_DEATH_NOTIFICATION_DONE:
1066 {
1067 BpBinder *proxy = (BpBinder*)mIn.readInt32();
1068 proxy->getWeakRefs()->decWeak(proxy);
1069 } break;
1070
1071 case BR_FINISHED:
1072 result = TIMED_OUT;
1073 break;
1074
1075 case BR_NOOP:
1076 break;
1077
1078 case BR_SPAWN_LOOPER:
1079 mProcess->spawnPooledThread(false);
1080 break;
1081
1082 default:
1083 printf("*** BAD COMMAND %d received from Binder driver\n", cmd);
1084 result = UNKNOWN_ERROR;
1085 break;
1086 }
1087
1088 if (result != NO_ERROR) {
1089 mLastError = result;
1090 }
1091
1092 return result;
1093 }
1094
threadDestructor(void * st)1095 void IPCThreadState::threadDestructor(void *st)
1096 {
1097 IPCThreadState* const self = static_cast<IPCThreadState*>(st);
1098 if (self) {
1099 self->flushCommands();
1100 #if defined(HAVE_ANDROID_OS)
1101 ioctl(self->mProcess->mDriverFD, BINDER_THREAD_EXIT, 0);
1102 #endif
1103 delete self;
1104 }
1105 }
1106
1107
freeBuffer(Parcel * parcel,const uint8_t * data,size_t dataSize,const size_t * objects,size_t objectsSize,void * cookie)1108 void IPCThreadState::freeBuffer(Parcel* parcel, const uint8_t* data, size_t dataSize,
1109 const size_t* objects, size_t objectsSize,
1110 void* cookie)
1111 {
1112 //LOGI("Freeing parcel %p", &parcel);
1113 IF_LOG_COMMANDS() {
1114 alog << "Writing BC_FREE_BUFFER for " << data << endl;
1115 }
1116 LOG_ASSERT(data != NULL, "Called with NULL data");
1117 if (parcel != NULL) parcel->closeFileDescriptors();
1118 IPCThreadState* state = self();
1119 state->mOut.writeInt32(BC_FREE_BUFFER);
1120 state->mOut.writeInt32((int32_t)data);
1121 }
1122
1123 }; // namespace android
1124