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 <binder/TextOutput.h> 24 25 #include <cutils/sched_policy.h> 26 #include <utils/Log.h> 27 #include <utils/SystemClock.h> 28 #include <utils/threads.h> 29 30 #include <private/binder/binder_module.h> 31 #include <private/binder/Static.h> 32 33 #include <errno.h> 34 #include <inttypes.h> 35 #include <pthread.h> 36 #include <sched.h> 37 #include <signal.h> 38 #include <stdio.h> 39 #include <sys/ioctl.h> 40 #include <sys/resource.h> 41 #include <unistd.h> 42 43 #if LOG_NDEBUG 44 45 #define IF_LOG_TRANSACTIONS() if (false) 46 #define IF_LOG_COMMANDS() if (false) 47 #define LOG_REMOTEREFS(...) 48 #define IF_LOG_REMOTEREFS() if (false) 49 #define LOG_THREADPOOL(...) 50 #define LOG_ONEWAY(...) 51 52 #else 53 54 #define IF_LOG_TRANSACTIONS() IF_ALOG(LOG_VERBOSE, "transact") 55 #define IF_LOG_COMMANDS() IF_ALOG(LOG_VERBOSE, "ipc") 56 #define LOG_REMOTEREFS(...) ALOG(LOG_DEBUG, "remoterefs", __VA_ARGS__) 57 #define IF_LOG_REMOTEREFS() IF_ALOG(LOG_DEBUG, "remoterefs") 58 #define LOG_THREADPOOL(...) ALOG(LOG_DEBUG, "threadpool", __VA_ARGS__) 59 #define LOG_ONEWAY(...) ALOG(LOG_DEBUG, "ipc", __VA_ARGS__) 60 61 #endif 62 63 // --------------------------------------------------------------------------- 64 65 namespace android { 66 67 static const char* getReturnString(size_t idx); 68 static const void* printReturnCommand(TextOutput& out, const void* _cmd); 69 static const void* printCommand(TextOutput& out, const void* _cmd); 70 71 // Static const and functions will be optimized out if not used, 72 // when LOG_NDEBUG and references in IF_LOG_COMMANDS() are optimized out. 73 static const char *kReturnStrings[] = { 74 "BR_ERROR", 75 "BR_OK", 76 "BR_TRANSACTION", 77 "BR_REPLY", 78 "BR_ACQUIRE_RESULT", 79 "BR_DEAD_REPLY", 80 "BR_TRANSACTION_COMPLETE", 81 "BR_INCREFS", 82 "BR_ACQUIRE", 83 "BR_RELEASE", 84 "BR_DECREFS", 85 "BR_ATTEMPT_ACQUIRE", 86 "BR_NOOP", 87 "BR_SPAWN_LOOPER", 88 "BR_FINISHED", 89 "BR_DEAD_BINDER", 90 "BR_CLEAR_DEATH_NOTIFICATION_DONE", 91 "BR_FAILED_REPLY" 92 }; 93 94 static const char *kCommandStrings[] = { 95 "BC_TRANSACTION", 96 "BC_REPLY", 97 "BC_ACQUIRE_RESULT", 98 "BC_FREE_BUFFER", 99 "BC_INCREFS", 100 "BC_ACQUIRE", 101 "BC_RELEASE", 102 "BC_DECREFS", 103 "BC_INCREFS_DONE", 104 "BC_ACQUIRE_DONE", 105 "BC_ATTEMPT_ACQUIRE", 106 "BC_REGISTER_LOOPER", 107 "BC_ENTER_LOOPER", 108 "BC_EXIT_LOOPER", 109 "BC_REQUEST_DEATH_NOTIFICATION", 110 "BC_CLEAR_DEATH_NOTIFICATION", 111 "BC_DEAD_BINDER_DONE" 112 }; 113 114 static const char* getReturnString(size_t idx) 115 { 116 if (idx < sizeof(kReturnStrings) / sizeof(kReturnStrings[0])) 117 return kReturnStrings[idx]; 118 else 119 return "unknown"; 120 } 121 122 static const void* printBinderTransactionData(TextOutput& out, const void* data) 123 { 124 const binder_transaction_data* btd = 125 (const binder_transaction_data*)data; 126 if (btd->target.handle < 1024) { 127 /* want to print descriptors in decimal; guess based on value */ 128 out << "target.desc=" << btd->target.handle; 129 } else { 130 out << "target.ptr=" << btd->target.ptr; 131 } 132 out << " (cookie " << btd->cookie << ")" << endl 133 << "code=" << TypeCode(btd->code) << ", flags=" << (void*)(long)btd->flags << endl 134 << "data=" << btd->data.ptr.buffer << " (" << (void*)btd->data_size 135 << " bytes)" << endl 136 << "offsets=" << btd->data.ptr.offsets << " (" << (void*)btd->offsets_size 137 << " bytes)"; 138 return btd+1; 139 } 140 141 static const void* printReturnCommand(TextOutput& out, const void* _cmd) 142 { 143 static const size_t N = sizeof(kReturnStrings)/sizeof(kReturnStrings[0]); 144 const int32_t* cmd = (const int32_t*)_cmd; 145 uint32_t code = (uint32_t)*cmd++; 146 size_t cmdIndex = code & 0xff; 147 if (code == BR_ERROR) { 148 out << "BR_ERROR: " << (void*)(long)(*cmd++) << endl; 149 return cmd; 150 } else if (cmdIndex >= N) { 151 out << "Unknown reply: " << code << endl; 152 return cmd; 153 } 154 out << kReturnStrings[cmdIndex]; 155 156 switch (code) { 157 case BR_TRANSACTION: 158 case BR_REPLY: { 159 out << ": " << indent; 160 cmd = (const int32_t *)printBinderTransactionData(out, cmd); 161 out << dedent; 162 } break; 163 164 case BR_ACQUIRE_RESULT: { 165 const int32_t res = *cmd++; 166 out << ": " << res << (res ? " (SUCCESS)" : " (FAILURE)"); 167 } break; 168 169 case BR_INCREFS: 170 case BR_ACQUIRE: 171 case BR_RELEASE: 172 case BR_DECREFS: { 173 const int32_t b = *cmd++; 174 const int32_t c = *cmd++; 175 out << ": target=" << (void*)(long)b << " (cookie " << (void*)(long)c << ")"; 176 } break; 177 178 case BR_ATTEMPT_ACQUIRE: { 179 const int32_t p = *cmd++; 180 const int32_t b = *cmd++; 181 const int32_t c = *cmd++; 182 out << ": target=" << (void*)(long)b << " (cookie " << (void*)(long)c 183 << "), pri=" << p; 184 } break; 185 186 case BR_DEAD_BINDER: 187 case BR_CLEAR_DEATH_NOTIFICATION_DONE: { 188 const int32_t c = *cmd++; 189 out << ": death cookie " << (void*)(long)c; 190 } break; 191 192 default: 193 // no details to show for: BR_OK, BR_DEAD_REPLY, 194 // BR_TRANSACTION_COMPLETE, BR_FINISHED 195 break; 196 } 197 198 out << endl; 199 return cmd; 200 } 201 202 static const void* printCommand(TextOutput& out, const void* _cmd) 203 { 204 static const size_t N = sizeof(kCommandStrings)/sizeof(kCommandStrings[0]); 205 const int32_t* cmd = (const int32_t*)_cmd; 206 uint32_t code = (uint32_t)*cmd++; 207 size_t cmdIndex = code & 0xff; 208 209 if (cmdIndex >= N) { 210 out << "Unknown command: " << code << endl; 211 return cmd; 212 } 213 out << kCommandStrings[cmdIndex]; 214 215 switch (code) { 216 case BC_TRANSACTION: 217 case BC_REPLY: { 218 out << ": " << indent; 219 cmd = (const int32_t *)printBinderTransactionData(out, cmd); 220 out << dedent; 221 } break; 222 223 case BC_ACQUIRE_RESULT: { 224 const int32_t res = *cmd++; 225 out << ": " << res << (res ? " (SUCCESS)" : " (FAILURE)"); 226 } break; 227 228 case BC_FREE_BUFFER: { 229 const int32_t buf = *cmd++; 230 out << ": buffer=" << (void*)(long)buf; 231 } break; 232 233 case BC_INCREFS: 234 case BC_ACQUIRE: 235 case BC_RELEASE: 236 case BC_DECREFS: { 237 const int32_t d = *cmd++; 238 out << ": desc=" << d; 239 } break; 240 241 case BC_INCREFS_DONE: 242 case BC_ACQUIRE_DONE: { 243 const int32_t b = *cmd++; 244 const int32_t c = *cmd++; 245 out << ": target=" << (void*)(long)b << " (cookie " << (void*)(long)c << ")"; 246 } break; 247 248 case BC_ATTEMPT_ACQUIRE: { 249 const int32_t p = *cmd++; 250 const int32_t d = *cmd++; 251 out << ": desc=" << d << ", pri=" << p; 252 } break; 253 254 case BC_REQUEST_DEATH_NOTIFICATION: 255 case BC_CLEAR_DEATH_NOTIFICATION: { 256 const int32_t h = *cmd++; 257 const int32_t c = *cmd++; 258 out << ": handle=" << h << " (death cookie " << (void*)(long)c << ")"; 259 } break; 260 261 case BC_DEAD_BINDER_DONE: { 262 const int32_t c = *cmd++; 263 out << ": death cookie " << (void*)(long)c; 264 } break; 265 266 default: 267 // no details to show for: BC_REGISTER_LOOPER, BC_ENTER_LOOPER, 268 // BC_EXIT_LOOPER 269 break; 270 } 271 272 out << endl; 273 return cmd; 274 } 275 276 static pthread_mutex_t gTLSMutex = PTHREAD_MUTEX_INITIALIZER; 277 static bool gHaveTLS = false; 278 static pthread_key_t gTLS = 0; 279 static bool gShutdown = false; 280 static bool gDisableBackgroundScheduling = false; 281 282 IPCThreadState* IPCThreadState::self() 283 { 284 if (gHaveTLS) { 285 restart: 286 const pthread_key_t k = gTLS; 287 IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k); 288 if (st) return st; 289 return new IPCThreadState; 290 } 291 292 if (gShutdown) { 293 ALOGW("Calling IPCThreadState::self() during shutdown is dangerous, expect a crash.\n"); 294 return NULL; 295 } 296 297 pthread_mutex_lock(&gTLSMutex); 298 if (!gHaveTLS) { 299 int key_create_value = pthread_key_create(&gTLS, threadDestructor); 300 if (key_create_value != 0) { 301 pthread_mutex_unlock(&gTLSMutex); 302 ALOGW("IPCThreadState::self() unable to create TLS key, expect a crash: %s\n", 303 strerror(key_create_value)); 304 return NULL; 305 } 306 gHaveTLS = true; 307 } 308 pthread_mutex_unlock(&gTLSMutex); 309 goto restart; 310 } 311 312 IPCThreadState* IPCThreadState::selfOrNull() 313 { 314 if (gHaveTLS) { 315 const pthread_key_t k = gTLS; 316 IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k); 317 return st; 318 } 319 return NULL; 320 } 321 322 void IPCThreadState::shutdown() 323 { 324 gShutdown = true; 325 326 if (gHaveTLS) { 327 // XXX Need to wait for all thread pool threads to exit! 328 IPCThreadState* st = (IPCThreadState*)pthread_getspecific(gTLS); 329 if (st) { 330 delete st; 331 pthread_setspecific(gTLS, NULL); 332 } 333 gHaveTLS = false; 334 } 335 } 336 337 void IPCThreadState::disableBackgroundScheduling(bool disable) 338 { 339 gDisableBackgroundScheduling = disable; 340 } 341 342 sp<ProcessState> IPCThreadState::process() 343 { 344 return mProcess; 345 } 346 347 status_t IPCThreadState::clearLastError() 348 { 349 const status_t err = mLastError; 350 mLastError = NO_ERROR; 351 return err; 352 } 353 354 pid_t IPCThreadState::getCallingPid() const 355 { 356 return mCallingPid; 357 } 358 359 uid_t IPCThreadState::getCallingUid() const 360 { 361 return mCallingUid; 362 } 363 364 int64_t IPCThreadState::clearCallingIdentity() 365 { 366 int64_t token = ((int64_t)mCallingUid<<32) | mCallingPid; 367 clearCaller(); 368 return token; 369 } 370 371 void IPCThreadState::setStrictModePolicy(int32_t policy) 372 { 373 mStrictModePolicy = policy; 374 } 375 376 int32_t IPCThreadState::getStrictModePolicy() const 377 { 378 return mStrictModePolicy; 379 } 380 381 void IPCThreadState::setLastTransactionBinderFlags(int32_t flags) 382 { 383 mLastTransactionBinderFlags = flags; 384 } 385 386 int32_t IPCThreadState::getLastTransactionBinderFlags() const 387 { 388 return mLastTransactionBinderFlags; 389 } 390 391 void IPCThreadState::restoreCallingIdentity(int64_t token) 392 { 393 mCallingUid = (int)(token>>32); 394 mCallingPid = (int)token; 395 } 396 397 void IPCThreadState::clearCaller() 398 { 399 mCallingPid = getpid(); 400 mCallingUid = getuid(); 401 } 402 403 void IPCThreadState::flushCommands() 404 { 405 if (mProcess->mDriverFD <= 0) 406 return; 407 talkWithDriver(false); 408 } 409 410 void IPCThreadState::blockUntilThreadAvailable() 411 { 412 pthread_mutex_lock(&mProcess->mThreadCountLock); 413 while (mProcess->mExecutingThreadsCount >= mProcess->mMaxThreads) { 414 ALOGW("Waiting for thread to be free. mExecutingThreadsCount=%lu mMaxThreads=%lu\n", 415 static_cast<unsigned long>(mProcess->mExecutingThreadsCount), 416 static_cast<unsigned long>(mProcess->mMaxThreads)); 417 pthread_cond_wait(&mProcess->mThreadCountDecrement, &mProcess->mThreadCountLock); 418 } 419 pthread_mutex_unlock(&mProcess->mThreadCountLock); 420 } 421 422 status_t IPCThreadState::getAndExecuteCommand() 423 { 424 status_t result; 425 int32_t cmd; 426 427 result = talkWithDriver(); 428 if (result >= NO_ERROR) { 429 size_t IN = mIn.dataAvail(); 430 if (IN < sizeof(int32_t)) return result; 431 cmd = mIn.readInt32(); 432 IF_LOG_COMMANDS() { 433 alog << "Processing top-level Command: " 434 << getReturnString(cmd) << endl; 435 } 436 437 pthread_mutex_lock(&mProcess->mThreadCountLock); 438 mProcess->mExecutingThreadsCount++; 439 if (mProcess->mExecutingThreadsCount >= mProcess->mMaxThreads && 440 mProcess->mStarvationStartTimeMs == 0) { 441 mProcess->mStarvationStartTimeMs = uptimeMillis(); 442 } 443 pthread_mutex_unlock(&mProcess->mThreadCountLock); 444 445 result = executeCommand(cmd); 446 447 pthread_mutex_lock(&mProcess->mThreadCountLock); 448 mProcess->mExecutingThreadsCount--; 449 if (mProcess->mExecutingThreadsCount < mProcess->mMaxThreads && 450 mProcess->mStarvationStartTimeMs != 0) { 451 int64_t starvationTimeMs = uptimeMillis() - mProcess->mStarvationStartTimeMs; 452 if (starvationTimeMs > 100) { 453 ALOGE("binder thread pool (%zu threads) starved for %" PRId64 " ms", 454 mProcess->mMaxThreads, starvationTimeMs); 455 } 456 mProcess->mStarvationStartTimeMs = 0; 457 } 458 pthread_cond_broadcast(&mProcess->mThreadCountDecrement); 459 pthread_mutex_unlock(&mProcess->mThreadCountLock); 460 461 // After executing the command, ensure that the thread is returned to the 462 // foreground cgroup before rejoining the pool. The driver takes care of 463 // restoring the priority, but doesn't do anything with cgroups so we 464 // need to take care of that here in userspace. Note that we do make 465 // sure to go in the foreground after executing a transaction, but 466 // there are other callbacks into user code that could have changed 467 // our group so we want to make absolutely sure it is put back. 468 set_sched_policy(mMyThreadId, SP_FOREGROUND); 469 } 470 471 return result; 472 } 473 474 // When we've cleared the incoming command queue, process any pending derefs 475 void IPCThreadState::processPendingDerefs() 476 { 477 if (mIn.dataPosition() >= mIn.dataSize()) { 478 size_t numPending = mPendingWeakDerefs.size(); 479 if (numPending > 0) { 480 for (size_t i = 0; i < numPending; i++) { 481 RefBase::weakref_type* refs = mPendingWeakDerefs[i]; 482 refs->decWeak(mProcess.get()); 483 } 484 mPendingWeakDerefs.clear(); 485 } 486 487 numPending = mPendingStrongDerefs.size(); 488 if (numPending > 0) { 489 for (size_t i = 0; i < numPending; i++) { 490 BBinder* obj = mPendingStrongDerefs[i]; 491 obj->decStrong(mProcess.get()); 492 } 493 mPendingStrongDerefs.clear(); 494 } 495 } 496 } 497 498 void IPCThreadState::joinThreadPool(bool isMain) 499 { 500 LOG_THREADPOOL("**** THREAD %p (PID %d) IS JOINING THE THREAD POOL\n", (void*)pthread_self(), getpid()); 501 502 mOut.writeInt32(isMain ? BC_ENTER_LOOPER : BC_REGISTER_LOOPER); 503 504 // This thread may have been spawned by a thread that was in the background 505 // scheduling group, so first we will make sure it is in the foreground 506 // one to avoid performing an initial transaction in the background. 507 set_sched_policy(mMyThreadId, SP_FOREGROUND); 508 509 status_t result; 510 do { 511 processPendingDerefs(); 512 // now get the next command to be processed, waiting if necessary 513 result = getAndExecuteCommand(); 514 515 if (result < NO_ERROR && result != TIMED_OUT && result != -ECONNREFUSED && result != -EBADF) { 516 ALOGE("getAndExecuteCommand(fd=%d) returned unexpected error %d, aborting", 517 mProcess->mDriverFD, result); 518 abort(); 519 } 520 521 // Let this thread exit the thread pool if it is no longer 522 // needed and it is not the main process thread. 523 if(result == TIMED_OUT && !isMain) { 524 break; 525 } 526 } while (result != -ECONNREFUSED && result != -EBADF); 527 528 LOG_THREADPOOL("**** THREAD %p (PID %d) IS LEAVING THE THREAD POOL err=%p\n", 529 (void*)pthread_self(), getpid(), (void*)result); 530 531 mOut.writeInt32(BC_EXIT_LOOPER); 532 talkWithDriver(false); 533 } 534 535 int IPCThreadState::setupPolling(int* fd) 536 { 537 if (mProcess->mDriverFD <= 0) { 538 return -EBADF; 539 } 540 541 mOut.writeInt32(BC_ENTER_LOOPER); 542 *fd = mProcess->mDriverFD; 543 return 0; 544 } 545 546 status_t IPCThreadState::handlePolledCommands() 547 { 548 status_t result; 549 550 do { 551 result = getAndExecuteCommand(); 552 } while (mIn.dataPosition() < mIn.dataSize()); 553 554 processPendingDerefs(); 555 flushCommands(); 556 return result; 557 } 558 559 void IPCThreadState::stopProcess(bool /*immediate*/) 560 { 561 //ALOGI("**** STOPPING PROCESS"); 562 flushCommands(); 563 int fd = mProcess->mDriverFD; 564 mProcess->mDriverFD = -1; 565 close(fd); 566 //kill(getpid(), SIGKILL); 567 } 568 569 status_t IPCThreadState::transact(int32_t handle, 570 uint32_t code, const Parcel& data, 571 Parcel* reply, uint32_t flags) 572 { 573 status_t err = data.errorCheck(); 574 575 flags |= TF_ACCEPT_FDS; 576 577 IF_LOG_TRANSACTIONS() { 578 TextOutput::Bundle _b(alog); 579 alog << "BC_TRANSACTION thr " << (void*)pthread_self() << " / hand " 580 << handle << " / code " << TypeCode(code) << ": " 581 << indent << data << dedent << endl; 582 } 583 584 if (err == NO_ERROR) { 585 LOG_ONEWAY(">>>> SEND from pid %d uid %d %s", getpid(), getuid(), 586 (flags & TF_ONE_WAY) == 0 ? "READ REPLY" : "ONE WAY"); 587 err = writeTransactionData(BC_TRANSACTION, flags, handle, code, data, NULL); 588 } 589 590 if (err != NO_ERROR) { 591 if (reply) reply->setError(err); 592 return (mLastError = err); 593 } 594 595 if ((flags & TF_ONE_WAY) == 0) { 596 #if 0 597 if (code == 4) { // relayout 598 ALOGI(">>>>>> CALLING transaction 4"); 599 } else { 600 ALOGI(">>>>>> CALLING transaction %d", code); 601 } 602 #endif 603 if (reply) { 604 err = waitForResponse(reply); 605 } else { 606 Parcel fakeReply; 607 err = waitForResponse(&fakeReply); 608 } 609 #if 0 610 if (code == 4) { // relayout 611 ALOGI("<<<<<< RETURNING transaction 4"); 612 } else { 613 ALOGI("<<<<<< RETURNING transaction %d", code); 614 } 615 #endif 616 617 IF_LOG_TRANSACTIONS() { 618 TextOutput::Bundle _b(alog); 619 alog << "BR_REPLY thr " << (void*)pthread_self() << " / hand " 620 << handle << ": "; 621 if (reply) alog << indent << *reply << dedent << endl; 622 else alog << "(none requested)" << endl; 623 } 624 } else { 625 err = waitForResponse(NULL, NULL); 626 } 627 628 return err; 629 } 630 631 void IPCThreadState::incStrongHandle(int32_t handle) 632 { 633 LOG_REMOTEREFS("IPCThreadState::incStrongHandle(%d)\n", handle); 634 mOut.writeInt32(BC_ACQUIRE); 635 mOut.writeInt32(handle); 636 } 637 638 void IPCThreadState::decStrongHandle(int32_t handle) 639 { 640 LOG_REMOTEREFS("IPCThreadState::decStrongHandle(%d)\n", handle); 641 mOut.writeInt32(BC_RELEASE); 642 mOut.writeInt32(handle); 643 } 644 645 void IPCThreadState::incWeakHandle(int32_t handle) 646 { 647 LOG_REMOTEREFS("IPCThreadState::incWeakHandle(%d)\n", handle); 648 mOut.writeInt32(BC_INCREFS); 649 mOut.writeInt32(handle); 650 } 651 652 void IPCThreadState::decWeakHandle(int32_t handle) 653 { 654 LOG_REMOTEREFS("IPCThreadState::decWeakHandle(%d)\n", handle); 655 mOut.writeInt32(BC_DECREFS); 656 mOut.writeInt32(handle); 657 } 658 659 status_t IPCThreadState::attemptIncStrongHandle(int32_t handle) 660 { 661 #if HAS_BC_ATTEMPT_ACQUIRE 662 LOG_REMOTEREFS("IPCThreadState::attemptIncStrongHandle(%d)\n", handle); 663 mOut.writeInt32(BC_ATTEMPT_ACQUIRE); 664 mOut.writeInt32(0); // xxx was thread priority 665 mOut.writeInt32(handle); 666 status_t result = UNKNOWN_ERROR; 667 668 waitForResponse(NULL, &result); 669 670 #if LOG_REFCOUNTS 671 printf("IPCThreadState::attemptIncStrongHandle(%ld) = %s\n", 672 handle, result == NO_ERROR ? "SUCCESS" : "FAILURE"); 673 #endif 674 675 return result; 676 #else 677 (void)handle; 678 ALOGE("%s(%d): Not supported\n", __func__, handle); 679 return INVALID_OPERATION; 680 #endif 681 } 682 683 void IPCThreadState::expungeHandle(int32_t handle, IBinder* binder) 684 { 685 #if LOG_REFCOUNTS 686 printf("IPCThreadState::expungeHandle(%ld)\n", handle); 687 #endif 688 self()->mProcess->expungeHandle(handle, binder); 689 } 690 691 status_t IPCThreadState::requestDeathNotification(int32_t handle, BpBinder* proxy) 692 { 693 mOut.writeInt32(BC_REQUEST_DEATH_NOTIFICATION); 694 mOut.writeInt32((int32_t)handle); 695 mOut.writePointer((uintptr_t)proxy); 696 return NO_ERROR; 697 } 698 699 status_t IPCThreadState::clearDeathNotification(int32_t handle, BpBinder* proxy) 700 { 701 mOut.writeInt32(BC_CLEAR_DEATH_NOTIFICATION); 702 mOut.writeInt32((int32_t)handle); 703 mOut.writePointer((uintptr_t)proxy); 704 return NO_ERROR; 705 } 706 707 IPCThreadState::IPCThreadState() 708 : mProcess(ProcessState::self()), 709 mMyThreadId(gettid()), 710 mStrictModePolicy(0), 711 mLastTransactionBinderFlags(0) 712 { 713 pthread_setspecific(gTLS, this); 714 clearCaller(); 715 mIn.setDataCapacity(256); 716 mOut.setDataCapacity(256); 717 } 718 719 IPCThreadState::~IPCThreadState() 720 { 721 } 722 723 status_t IPCThreadState::sendReply(const Parcel& reply, uint32_t flags) 724 { 725 status_t err; 726 status_t statusBuffer; 727 err = writeTransactionData(BC_REPLY, flags, -1, 0, reply, &statusBuffer); 728 if (err < NO_ERROR) return err; 729 730 return waitForResponse(NULL, NULL); 731 } 732 733 status_t IPCThreadState::waitForResponse(Parcel *reply, status_t *acquireResult) 734 { 735 uint32_t cmd; 736 int32_t err; 737 738 while (1) { 739 if ((err=talkWithDriver()) < NO_ERROR) break; 740 err = mIn.errorCheck(); 741 if (err < NO_ERROR) break; 742 if (mIn.dataAvail() == 0) continue; 743 744 cmd = (uint32_t)mIn.readInt32(); 745 746 IF_LOG_COMMANDS() { 747 alog << "Processing waitForResponse Command: " 748 << getReturnString(cmd) << endl; 749 } 750 751 switch (cmd) { 752 case BR_TRANSACTION_COMPLETE: 753 if (!reply && !acquireResult) goto finish; 754 break; 755 756 case BR_DEAD_REPLY: 757 err = DEAD_OBJECT; 758 goto finish; 759 760 case BR_FAILED_REPLY: 761 err = FAILED_TRANSACTION; 762 goto finish; 763 764 case BR_ACQUIRE_RESULT: 765 { 766 ALOG_ASSERT(acquireResult != NULL, "Unexpected brACQUIRE_RESULT"); 767 const int32_t result = mIn.readInt32(); 768 if (!acquireResult) continue; 769 *acquireResult = result ? NO_ERROR : INVALID_OPERATION; 770 } 771 goto finish; 772 773 case BR_REPLY: 774 { 775 binder_transaction_data tr; 776 err = mIn.read(&tr, sizeof(tr)); 777 ALOG_ASSERT(err == NO_ERROR, "Not enough command data for brREPLY"); 778 if (err != NO_ERROR) goto finish; 779 780 if (reply) { 781 if ((tr.flags & TF_STATUS_CODE) == 0) { 782 reply->ipcSetDataReference( 783 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 784 tr.data_size, 785 reinterpret_cast<const binder_size_t*>(tr.data.ptr.offsets), 786 tr.offsets_size/sizeof(binder_size_t), 787 freeBuffer, this); 788 } else { 789 err = *reinterpret_cast<const status_t*>(tr.data.ptr.buffer); 790 freeBuffer(NULL, 791 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 792 tr.data_size, 793 reinterpret_cast<const binder_size_t*>(tr.data.ptr.offsets), 794 tr.offsets_size/sizeof(binder_size_t), this); 795 } 796 } else { 797 freeBuffer(NULL, 798 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 799 tr.data_size, 800 reinterpret_cast<const binder_size_t*>(tr.data.ptr.offsets), 801 tr.offsets_size/sizeof(binder_size_t), this); 802 continue; 803 } 804 } 805 goto finish; 806 807 default: 808 err = executeCommand(cmd); 809 if (err != NO_ERROR) goto finish; 810 break; 811 } 812 } 813 814 finish: 815 if (err != NO_ERROR) { 816 if (acquireResult) *acquireResult = err; 817 if (reply) reply->setError(err); 818 mLastError = err; 819 } 820 821 return err; 822 } 823 824 status_t IPCThreadState::talkWithDriver(bool doReceive) 825 { 826 if (mProcess->mDriverFD <= 0) { 827 return -EBADF; 828 } 829 830 binder_write_read bwr; 831 832 // Is the read buffer empty? 833 const bool needRead = mIn.dataPosition() >= mIn.dataSize(); 834 835 // We don't want to write anything if we are still reading 836 // from data left in the input buffer and the caller 837 // has requested to read the next data. 838 const size_t outAvail = (!doReceive || needRead) ? mOut.dataSize() : 0; 839 840 bwr.write_size = outAvail; 841 bwr.write_buffer = (uintptr_t)mOut.data(); 842 843 // This is what we'll read. 844 if (doReceive && needRead) { 845 bwr.read_size = mIn.dataCapacity(); 846 bwr.read_buffer = (uintptr_t)mIn.data(); 847 } else { 848 bwr.read_size = 0; 849 bwr.read_buffer = 0; 850 } 851 852 IF_LOG_COMMANDS() { 853 TextOutput::Bundle _b(alog); 854 if (outAvail != 0) { 855 alog << "Sending commands to driver: " << indent; 856 const void* cmds = (const void*)bwr.write_buffer; 857 const void* end = ((const uint8_t*)cmds)+bwr.write_size; 858 alog << HexDump(cmds, bwr.write_size) << endl; 859 while (cmds < end) cmds = printCommand(alog, cmds); 860 alog << dedent; 861 } 862 alog << "Size of receive buffer: " << bwr.read_size 863 << ", needRead: " << needRead << ", doReceive: " << doReceive << endl; 864 } 865 866 // Return immediately if there is nothing to do. 867 if ((bwr.write_size == 0) && (bwr.read_size == 0)) return NO_ERROR; 868 869 bwr.write_consumed = 0; 870 bwr.read_consumed = 0; 871 status_t err; 872 do { 873 IF_LOG_COMMANDS() { 874 alog << "About to read/write, write size = " << mOut.dataSize() << endl; 875 } 876 #if defined(__ANDROID__) 877 if (ioctl(mProcess->mDriverFD, BINDER_WRITE_READ, &bwr) >= 0) 878 err = NO_ERROR; 879 else 880 err = -errno; 881 #else 882 err = INVALID_OPERATION; 883 #endif 884 if (mProcess->mDriverFD <= 0) { 885 err = -EBADF; 886 } 887 IF_LOG_COMMANDS() { 888 alog << "Finished read/write, write size = " << mOut.dataSize() << endl; 889 } 890 } while (err == -EINTR); 891 892 IF_LOG_COMMANDS() { 893 alog << "Our err: " << (void*)(intptr_t)err << ", write consumed: " 894 << bwr.write_consumed << " (of " << mOut.dataSize() 895 << "), read consumed: " << bwr.read_consumed << endl; 896 } 897 898 if (err >= NO_ERROR) { 899 if (bwr.write_consumed > 0) { 900 if (bwr.write_consumed < mOut.dataSize()) 901 mOut.remove(0, bwr.write_consumed); 902 else 903 mOut.setDataSize(0); 904 } 905 if (bwr.read_consumed > 0) { 906 mIn.setDataSize(bwr.read_consumed); 907 mIn.setDataPosition(0); 908 } 909 IF_LOG_COMMANDS() { 910 TextOutput::Bundle _b(alog); 911 alog << "Remaining data size: " << mOut.dataSize() << endl; 912 alog << "Received commands from driver: " << indent; 913 const void* cmds = mIn.data(); 914 const void* end = mIn.data() + mIn.dataSize(); 915 alog << HexDump(cmds, mIn.dataSize()) << endl; 916 while (cmds < end) cmds = printReturnCommand(alog, cmds); 917 alog << dedent; 918 } 919 return NO_ERROR; 920 } 921 922 return err; 923 } 924 925 status_t IPCThreadState::writeTransactionData(int32_t cmd, uint32_t binderFlags, 926 int32_t handle, uint32_t code, const Parcel& data, status_t* statusBuffer) 927 { 928 binder_transaction_data tr; 929 930 tr.target.ptr = 0; /* Don't pass uninitialized stack data to a remote process */ 931 tr.target.handle = handle; 932 tr.code = code; 933 tr.flags = binderFlags; 934 tr.cookie = 0; 935 tr.sender_pid = 0; 936 tr.sender_euid = 0; 937 938 const status_t err = data.errorCheck(); 939 if (err == NO_ERROR) { 940 tr.data_size = data.ipcDataSize(); 941 tr.data.ptr.buffer = data.ipcData(); 942 tr.offsets_size = data.ipcObjectsCount()*sizeof(binder_size_t); 943 tr.data.ptr.offsets = data.ipcObjects(); 944 } else if (statusBuffer) { 945 tr.flags |= TF_STATUS_CODE; 946 *statusBuffer = err; 947 tr.data_size = sizeof(status_t); 948 tr.data.ptr.buffer = reinterpret_cast<uintptr_t>(statusBuffer); 949 tr.offsets_size = 0; 950 tr.data.ptr.offsets = 0; 951 } else { 952 return (mLastError = err); 953 } 954 955 mOut.writeInt32(cmd); 956 mOut.write(&tr, sizeof(tr)); 957 958 return NO_ERROR; 959 } 960 961 sp<BBinder> the_context_object; 962 963 void setTheContextObject(sp<BBinder> obj) 964 { 965 the_context_object = obj; 966 } 967 968 status_t IPCThreadState::executeCommand(int32_t cmd) 969 { 970 BBinder* obj; 971 RefBase::weakref_type* refs; 972 status_t result = NO_ERROR; 973 974 switch ((uint32_t)cmd) { 975 case BR_ERROR: 976 result = mIn.readInt32(); 977 break; 978 979 case BR_OK: 980 break; 981 982 case BR_ACQUIRE: 983 refs = (RefBase::weakref_type*)mIn.readPointer(); 984 obj = (BBinder*)mIn.readPointer(); 985 ALOG_ASSERT(refs->refBase() == obj, 986 "BR_ACQUIRE: object %p does not match cookie %p (expected %p)", 987 refs, obj, refs->refBase()); 988 obj->incStrong(mProcess.get()); 989 IF_LOG_REMOTEREFS() { 990 LOG_REMOTEREFS("BR_ACQUIRE from driver on %p", obj); 991 obj->printRefs(); 992 } 993 mOut.writeInt32(BC_ACQUIRE_DONE); 994 mOut.writePointer((uintptr_t)refs); 995 mOut.writePointer((uintptr_t)obj); 996 break; 997 998 case BR_RELEASE: 999 refs = (RefBase::weakref_type*)mIn.readPointer(); 1000 obj = (BBinder*)mIn.readPointer(); 1001 ALOG_ASSERT(refs->refBase() == obj, 1002 "BR_RELEASE: object %p does not match cookie %p (expected %p)", 1003 refs, obj, refs->refBase()); 1004 IF_LOG_REMOTEREFS() { 1005 LOG_REMOTEREFS("BR_RELEASE from driver on %p", obj); 1006 obj->printRefs(); 1007 } 1008 mPendingStrongDerefs.push(obj); 1009 break; 1010 1011 case BR_INCREFS: 1012 refs = (RefBase::weakref_type*)mIn.readPointer(); 1013 obj = (BBinder*)mIn.readPointer(); 1014 refs->incWeak(mProcess.get()); 1015 mOut.writeInt32(BC_INCREFS_DONE); 1016 mOut.writePointer((uintptr_t)refs); 1017 mOut.writePointer((uintptr_t)obj); 1018 break; 1019 1020 case BR_DECREFS: 1021 refs = (RefBase::weakref_type*)mIn.readPointer(); 1022 obj = (BBinder*)mIn.readPointer(); 1023 // NOTE: This assertion is not valid, because the object may no 1024 // longer exist (thus the (BBinder*)cast above resulting in a different 1025 // memory address). 1026 //ALOG_ASSERT(refs->refBase() == obj, 1027 // "BR_DECREFS: object %p does not match cookie %p (expected %p)", 1028 // refs, obj, refs->refBase()); 1029 mPendingWeakDerefs.push(refs); 1030 break; 1031 1032 case BR_ATTEMPT_ACQUIRE: 1033 refs = (RefBase::weakref_type*)mIn.readPointer(); 1034 obj = (BBinder*)mIn.readPointer(); 1035 1036 { 1037 const bool success = refs->attemptIncStrong(mProcess.get()); 1038 ALOG_ASSERT(success && refs->refBase() == obj, 1039 "BR_ATTEMPT_ACQUIRE: object %p does not match cookie %p (expected %p)", 1040 refs, obj, refs->refBase()); 1041 1042 mOut.writeInt32(BC_ACQUIRE_RESULT); 1043 mOut.writeInt32((int32_t)success); 1044 } 1045 break; 1046 1047 case BR_TRANSACTION: 1048 { 1049 binder_transaction_data tr; 1050 result = mIn.read(&tr, sizeof(tr)); 1051 ALOG_ASSERT(result == NO_ERROR, 1052 "Not enough command data for brTRANSACTION"); 1053 if (result != NO_ERROR) break; 1054 1055 Parcel buffer; 1056 buffer.ipcSetDataReference( 1057 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 1058 tr.data_size, 1059 reinterpret_cast<const binder_size_t*>(tr.data.ptr.offsets), 1060 tr.offsets_size/sizeof(binder_size_t), freeBuffer, this); 1061 1062 const pid_t origPid = mCallingPid; 1063 const uid_t origUid = mCallingUid; 1064 const int32_t origStrictModePolicy = mStrictModePolicy; 1065 const int32_t origTransactionBinderFlags = mLastTransactionBinderFlags; 1066 1067 mCallingPid = tr.sender_pid; 1068 mCallingUid = tr.sender_euid; 1069 mLastTransactionBinderFlags = tr.flags; 1070 1071 int curPrio = getpriority(PRIO_PROCESS, mMyThreadId); 1072 if (gDisableBackgroundScheduling) { 1073 if (curPrio > ANDROID_PRIORITY_NORMAL) { 1074 // We have inherited a reduced priority from the caller, but do not 1075 // want to run in that state in this process. The driver set our 1076 // priority already (though not our scheduling class), so bounce 1077 // it back to the default before invoking the transaction. 1078 setpriority(PRIO_PROCESS, mMyThreadId, ANDROID_PRIORITY_NORMAL); 1079 } 1080 } else { 1081 if (curPrio >= ANDROID_PRIORITY_BACKGROUND) { 1082 // We want to use the inherited priority from the caller. 1083 // Ensure this thread is in the background scheduling class, 1084 // since the driver won't modify scheduling classes for us. 1085 // The scheduling group is reset to default by the caller 1086 // once this method returns after the transaction is complete. 1087 set_sched_policy(mMyThreadId, SP_BACKGROUND); 1088 } 1089 } 1090 1091 //ALOGI(">>>> TRANSACT from pid %d uid %d\n", mCallingPid, mCallingUid); 1092 1093 Parcel reply; 1094 status_t error; 1095 IF_LOG_TRANSACTIONS() { 1096 TextOutput::Bundle _b(alog); 1097 alog << "BR_TRANSACTION thr " << (void*)pthread_self() 1098 << " / obj " << tr.target.ptr << " / code " 1099 << TypeCode(tr.code) << ": " << indent << buffer 1100 << dedent << endl 1101 << "Data addr = " 1102 << reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer) 1103 << ", offsets addr=" 1104 << reinterpret_cast<const size_t*>(tr.data.ptr.offsets) << endl; 1105 } 1106 if (tr.target.ptr) { 1107 // We only have a weak reference on the target object, so we must first try to 1108 // safely acquire a strong reference before doing anything else with it. 1109 if (reinterpret_cast<RefBase::weakref_type*>( 1110 tr.target.ptr)->attemptIncStrong(this)) { 1111 error = reinterpret_cast<BBinder*>(tr.cookie)->transact(tr.code, buffer, 1112 &reply, tr.flags); 1113 reinterpret_cast<BBinder*>(tr.cookie)->decStrong(this); 1114 } else { 1115 error = UNKNOWN_TRANSACTION; 1116 } 1117 1118 } else { 1119 error = the_context_object->transact(tr.code, buffer, &reply, tr.flags); 1120 } 1121 1122 //ALOGI("<<<< TRANSACT from pid %d restore pid %d uid %d\n", 1123 // mCallingPid, origPid, origUid); 1124 1125 if ((tr.flags & TF_ONE_WAY) == 0) { 1126 LOG_ONEWAY("Sending reply to %d!", mCallingPid); 1127 if (error < NO_ERROR) reply.setError(error); 1128 sendReply(reply, 0); 1129 } else { 1130 LOG_ONEWAY("NOT sending reply to %d!", mCallingPid); 1131 } 1132 1133 mCallingPid = origPid; 1134 mCallingUid = origUid; 1135 mStrictModePolicy = origStrictModePolicy; 1136 mLastTransactionBinderFlags = origTransactionBinderFlags; 1137 1138 IF_LOG_TRANSACTIONS() { 1139 TextOutput::Bundle _b(alog); 1140 alog << "BC_REPLY thr " << (void*)pthread_self() << " / obj " 1141 << tr.target.ptr << ": " << indent << reply << dedent << endl; 1142 } 1143 1144 } 1145 break; 1146 1147 case BR_DEAD_BINDER: 1148 { 1149 BpBinder *proxy = (BpBinder*)mIn.readPointer(); 1150 proxy->sendObituary(); 1151 mOut.writeInt32(BC_DEAD_BINDER_DONE); 1152 mOut.writePointer((uintptr_t)proxy); 1153 } break; 1154 1155 case BR_CLEAR_DEATH_NOTIFICATION_DONE: 1156 { 1157 BpBinder *proxy = (BpBinder*)mIn.readPointer(); 1158 proxy->getWeakRefs()->decWeak(proxy); 1159 } break; 1160 1161 case BR_FINISHED: 1162 result = TIMED_OUT; 1163 break; 1164 1165 case BR_NOOP: 1166 break; 1167 1168 case BR_SPAWN_LOOPER: 1169 mProcess->spawnPooledThread(false); 1170 break; 1171 1172 default: 1173 printf("*** BAD COMMAND %d received from Binder driver\n", cmd); 1174 result = UNKNOWN_ERROR; 1175 break; 1176 } 1177 1178 if (result != NO_ERROR) { 1179 mLastError = result; 1180 } 1181 1182 return result; 1183 } 1184 1185 void IPCThreadState::threadDestructor(void *st) 1186 { 1187 IPCThreadState* const self = static_cast<IPCThreadState*>(st); 1188 if (self) { 1189 self->flushCommands(); 1190 #if defined(__ANDROID__) 1191 if (self->mProcess->mDriverFD > 0) { 1192 ioctl(self->mProcess->mDriverFD, BINDER_THREAD_EXIT, 0); 1193 } 1194 #endif 1195 delete self; 1196 } 1197 } 1198 1199 1200 void IPCThreadState::freeBuffer(Parcel* parcel, const uint8_t* data, 1201 size_t /*dataSize*/, 1202 const binder_size_t* /*objects*/, 1203 size_t /*objectsSize*/, void* /*cookie*/) 1204 { 1205 //ALOGI("Freeing parcel %p", &parcel); 1206 IF_LOG_COMMANDS() { 1207 alog << "Writing BC_FREE_BUFFER for " << data << endl; 1208 } 1209 ALOG_ASSERT(data != NULL, "Called with NULL data"); 1210 if (parcel != NULL) parcel->closeFileDescriptors(); 1211 IPCThreadState* state = self(); 1212 state->mOut.writeInt32(BC_FREE_BUFFER); 1213 state->mOut.writePointer((uintptr_t)data); 1214 } 1215 1216 }; // namespace android 1217
