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 }; 120 121 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 } 128 129 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 } 136 137 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 } 155 156 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 } 216 217 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; 297 298 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 } 321 322 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 } 331 332 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 } 346 347 void IPCThreadState::disableBackgroundScheduling(bool disable) 348 { 349 gDisableBackgroundScheduling = disable; 350 } 351 352 sp<ProcessState> IPCThreadState::process() 353 { 354 return mProcess; 355 } 356 357 status_t IPCThreadState::clearLastError() 358 { 359 const status_t err = mLastError; 360 mLastError = NO_ERROR; 361 return err; 362 } 363 364 int IPCThreadState::getCallingPid() 365 { 366 return mCallingPid; 367 } 368 369 int IPCThreadState::getCallingUid() 370 { 371 return mCallingUid; 372 } 373 374 int64_t IPCThreadState::clearCallingIdentity() 375 { 376 int64_t token = ((int64_t)mCallingUid<<32) | mCallingPid; 377 clearCaller(); 378 return token; 379 } 380 381 void IPCThreadState::setStrictModePolicy(int32_t policy) 382 { 383 mStrictModePolicy = policy; 384 } 385 386 int32_t IPCThreadState::getStrictModePolicy() const 387 { 388 return mStrictModePolicy; 389 } 390 391 void IPCThreadState::setLastTransactionBinderFlags(int32_t flags) 392 { 393 mLastTransactionBinderFlags = flags; 394 } 395 396 int32_t IPCThreadState::getLastTransactionBinderFlags() const 397 { 398 return mLastTransactionBinderFlags; 399 } 400 401 void IPCThreadState::restoreCallingIdentity(int64_t token) 402 { 403 mCallingUid = (int)(token>>32); 404 mCallingPid = (int)token; 405 } 406 407 void IPCThreadState::clearCaller() 408 { 409 mCallingPid = getpid(); 410 mCallingUid = getuid(); 411 } 412 413 void IPCThreadState::flushCommands() 414 { 415 if (mProcess->mDriverFD <= 0) 416 return; 417 talkWithDriver(false); 418 } 419 420 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 } 493 494 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 } 503 504 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 } 565 566 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 } 572 573 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 } 579 580 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 } 586 587 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 } 593 594 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 } 611 612 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 } 619 620 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 } 627 628 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 } 635 636 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 } 647 648 IPCThreadState::~IPCThreadState() 649 { 650 } 651 652 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 } 661 662 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 } 752 753 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 bwr.read_buffer = 0; 777 } 778 779 IF_LOG_COMMANDS() { 780 TextOutput::Bundle _b(alog); 781 if (outAvail != 0) { 782 alog << "Sending commands to driver: " << indent; 783 const void* cmds = (const void*)bwr.write_buffer; 784 const void* end = ((const uint8_t*)cmds)+bwr.write_size; 785 alog << HexDump(cmds, bwr.write_size) << endl; 786 while (cmds < end) cmds = printCommand(alog, cmds); 787 alog << dedent; 788 } 789 alog << "Size of receive buffer: " << bwr.read_size 790 << ", needRead: " << needRead << ", doReceive: " << doReceive << endl; 791 } 792 793 // Return immediately if there is nothing to do. 794 if ((bwr.write_size == 0) && (bwr.read_size == 0)) return NO_ERROR; 795 796 bwr.write_consumed = 0; 797 bwr.read_consumed = 0; 798 status_t err; 799 do { 800 IF_LOG_COMMANDS() { 801 alog << "About to read/write, write size = " << mOut.dataSize() << endl; 802 } 803 #if defined(HAVE_ANDROID_OS) 804 if (ioctl(mProcess->mDriverFD, BINDER_WRITE_READ, &bwr) >= 0) 805 err = NO_ERROR; 806 else 807 err = -errno; 808 #else 809 err = INVALID_OPERATION; 810 #endif 811 IF_LOG_COMMANDS() { 812 alog << "Finished read/write, write size = " << mOut.dataSize() << endl; 813 } 814 } while (err == -EINTR); 815 816 IF_LOG_COMMANDS() { 817 alog << "Our err: " << (void*)err << ", write consumed: " 818 << bwr.write_consumed << " (of " << mOut.dataSize() 819 << "), read consumed: " << bwr.read_consumed << endl; 820 } 821 822 if (err >= NO_ERROR) { 823 if (bwr.write_consumed > 0) { 824 if (bwr.write_consumed < (ssize_t)mOut.dataSize()) 825 mOut.remove(0, bwr.write_consumed); 826 else 827 mOut.setDataSize(0); 828 } 829 if (bwr.read_consumed > 0) { 830 mIn.setDataSize(bwr.read_consumed); 831 mIn.setDataPosition(0); 832 } 833 IF_LOG_COMMANDS() { 834 TextOutput::Bundle _b(alog); 835 alog << "Remaining data size: " << mOut.dataSize() << endl; 836 alog << "Received commands from driver: " << indent; 837 const void* cmds = mIn.data(); 838 const void* end = mIn.data() + mIn.dataSize(); 839 alog << HexDump(cmds, mIn.dataSize()) << endl; 840 while (cmds < end) cmds = printReturnCommand(alog, cmds); 841 alog << dedent; 842 } 843 return NO_ERROR; 844 } 845 846 return err; 847 } 848 849 status_t IPCThreadState::writeTransactionData(int32_t cmd, uint32_t binderFlags, 850 int32_t handle, uint32_t code, const Parcel& data, status_t* statusBuffer) 851 { 852 binder_transaction_data tr; 853 854 tr.target.handle = handle; 855 tr.code = code; 856 tr.flags = binderFlags; 857 tr.cookie = 0; 858 tr.sender_pid = 0; 859 tr.sender_euid = 0; 860 861 const status_t err = data.errorCheck(); 862 if (err == NO_ERROR) { 863 tr.data_size = data.ipcDataSize(); 864 tr.data.ptr.buffer = data.ipcData(); 865 tr.offsets_size = data.ipcObjectsCount()*sizeof(size_t); 866 tr.data.ptr.offsets = data.ipcObjects(); 867 } else if (statusBuffer) { 868 tr.flags |= TF_STATUS_CODE; 869 *statusBuffer = err; 870 tr.data_size = sizeof(status_t); 871 tr.data.ptr.buffer = statusBuffer; 872 tr.offsets_size = 0; 873 tr.data.ptr.offsets = NULL; 874 } else { 875 return (mLastError = err); 876 } 877 878 mOut.writeInt32(cmd); 879 mOut.write(&tr, sizeof(tr)); 880 881 return NO_ERROR; 882 } 883 884 sp<BBinder> the_context_object; 885 886 void setTheContextObject(sp<BBinder> obj) 887 { 888 the_context_object = obj; 889 } 890 891 status_t IPCThreadState::executeCommand(int32_t cmd) 892 { 893 BBinder* obj; 894 RefBase::weakref_type* refs; 895 status_t result = NO_ERROR; 896 897 switch (cmd) { 898 case BR_ERROR: 899 result = mIn.readInt32(); 900 break; 901 902 case BR_OK: 903 break; 904 905 case BR_ACQUIRE: 906 refs = (RefBase::weakref_type*)mIn.readInt32(); 907 obj = (BBinder*)mIn.readInt32(); 908 LOG_ASSERT(refs->refBase() == obj, 909 "BR_ACQUIRE: object %p does not match cookie %p (expected %p)", 910 refs, obj, refs->refBase()); 911 obj->incStrong(mProcess.get()); 912 IF_LOG_REMOTEREFS() { 913 LOG_REMOTEREFS("BR_ACQUIRE from driver on %p", obj); 914 obj->printRefs(); 915 } 916 mOut.writeInt32(BC_ACQUIRE_DONE); 917 mOut.writeInt32((int32_t)refs); 918 mOut.writeInt32((int32_t)obj); 919 break; 920 921 case BR_RELEASE: 922 refs = (RefBase::weakref_type*)mIn.readInt32(); 923 obj = (BBinder*)mIn.readInt32(); 924 LOG_ASSERT(refs->refBase() == obj, 925 "BR_RELEASE: object %p does not match cookie %p (expected %p)", 926 refs, obj, refs->refBase()); 927 IF_LOG_REMOTEREFS() { 928 LOG_REMOTEREFS("BR_RELEASE from driver on %p", obj); 929 obj->printRefs(); 930 } 931 mPendingStrongDerefs.push(obj); 932 break; 933 934 case BR_INCREFS: 935 refs = (RefBase::weakref_type*)mIn.readInt32(); 936 obj = (BBinder*)mIn.readInt32(); 937 refs->incWeak(mProcess.get()); 938 mOut.writeInt32(BC_INCREFS_DONE); 939 mOut.writeInt32((int32_t)refs); 940 mOut.writeInt32((int32_t)obj); 941 break; 942 943 case BR_DECREFS: 944 refs = (RefBase::weakref_type*)mIn.readInt32(); 945 obj = (BBinder*)mIn.readInt32(); 946 // NOTE: This assertion is not valid, because the object may no 947 // longer exist (thus the (BBinder*)cast above resulting in a different 948 // memory address). 949 //LOG_ASSERT(refs->refBase() == obj, 950 // "BR_DECREFS: object %p does not match cookie %p (expected %p)", 951 // refs, obj, refs->refBase()); 952 mPendingWeakDerefs.push(refs); 953 break; 954 955 case BR_ATTEMPT_ACQUIRE: 956 refs = (RefBase::weakref_type*)mIn.readInt32(); 957 obj = (BBinder*)mIn.readInt32(); 958 959 { 960 const bool success = refs->attemptIncStrong(mProcess.get()); 961 LOG_ASSERT(success && refs->refBase() == obj, 962 "BR_ATTEMPT_ACQUIRE: object %p does not match cookie %p (expected %p)", 963 refs, obj, refs->refBase()); 964 965 mOut.writeInt32(BC_ACQUIRE_RESULT); 966 mOut.writeInt32((int32_t)success); 967 } 968 break; 969 970 case BR_TRANSACTION: 971 { 972 binder_transaction_data tr; 973 result = mIn.read(&tr, sizeof(tr)); 974 LOG_ASSERT(result == NO_ERROR, 975 "Not enough command data for brTRANSACTION"); 976 if (result != NO_ERROR) break; 977 978 Parcel buffer; 979 buffer.ipcSetDataReference( 980 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 981 tr.data_size, 982 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 983 tr.offsets_size/sizeof(size_t), freeBuffer, this); 984 985 const pid_t origPid = mCallingPid; 986 const uid_t origUid = mCallingUid; 987 988 mCallingPid = tr.sender_pid; 989 mCallingUid = tr.sender_euid; 990 991 int curPrio = getpriority(PRIO_PROCESS, mMyThreadId); 992 if (gDisableBackgroundScheduling) { 993 if (curPrio > ANDROID_PRIORITY_NORMAL) { 994 // We have inherited a reduced priority from the caller, but do not 995 // want to run in that state in this process. The driver set our 996 // priority already (though not our scheduling class), so bounce 997 // it back to the default before invoking the transaction. 998 setpriority(PRIO_PROCESS, mMyThreadId, ANDROID_PRIORITY_NORMAL); 999 } 1000 } else { 1001 if (curPrio >= ANDROID_PRIORITY_BACKGROUND) { 1002 // We want to use the inherited priority from the caller. 1003 // Ensure this thread is in the background scheduling class, 1004 // since the driver won't modify scheduling classes for us. 1005 // The scheduling group is reset to default by the caller 1006 // once this method returns after the transaction is complete. 1007 androidSetThreadSchedulingGroup(mMyThreadId, 1008 ANDROID_TGROUP_BG_NONINTERACT); 1009 } 1010 } 1011 1012 //LOGI(">>>> TRANSACT from pid %d uid %d\n", mCallingPid, mCallingUid); 1013 1014 Parcel reply; 1015 IF_LOG_TRANSACTIONS() { 1016 TextOutput::Bundle _b(alog); 1017 alog << "BR_TRANSACTION thr " << (void*)pthread_self() 1018 << " / obj " << tr.target.ptr << " / code " 1019 << TypeCode(tr.code) << ": " << indent << buffer 1020 << dedent << endl 1021 << "Data addr = " 1022 << reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer) 1023 << ", offsets addr=" 1024 << reinterpret_cast<const size_t*>(tr.data.ptr.offsets) << endl; 1025 } 1026 if (tr.target.ptr) { 1027 sp<BBinder> b((BBinder*)tr.cookie); 1028 const status_t error = b->transact(tr.code, buffer, &reply, tr.flags); 1029 if (error < NO_ERROR) reply.setError(error); 1030 1031 } else { 1032 const status_t error = the_context_object->transact(tr.code, buffer, &reply, tr.flags); 1033 if (error < NO_ERROR) reply.setError(error); 1034 } 1035 1036 //LOGI("<<<< TRANSACT from pid %d restore pid %d uid %d\n", 1037 // mCallingPid, origPid, origUid); 1038 1039 if ((tr.flags & TF_ONE_WAY) == 0) { 1040 LOG_ONEWAY("Sending reply to %d!", mCallingPid); 1041 sendReply(reply, 0); 1042 } else { 1043 LOG_ONEWAY("NOT sending reply to %d!", mCallingPid); 1044 } 1045 1046 mCallingPid = origPid; 1047 mCallingUid = origUid; 1048 1049 IF_LOG_TRANSACTIONS() { 1050 TextOutput::Bundle _b(alog); 1051 alog << "BC_REPLY thr " << (void*)pthread_self() << " / obj " 1052 << tr.target.ptr << ": " << indent << reply << dedent << endl; 1053 } 1054 1055 } 1056 break; 1057 1058 case BR_DEAD_BINDER: 1059 { 1060 BpBinder *proxy = (BpBinder*)mIn.readInt32(); 1061 proxy->sendObituary(); 1062 mOut.writeInt32(BC_DEAD_BINDER_DONE); 1063 mOut.writeInt32((int32_t)proxy); 1064 } break; 1065 1066 case BR_CLEAR_DEATH_NOTIFICATION_DONE: 1067 { 1068 BpBinder *proxy = (BpBinder*)mIn.readInt32(); 1069 proxy->getWeakRefs()->decWeak(proxy); 1070 } break; 1071 1072 case BR_FINISHED: 1073 result = TIMED_OUT; 1074 break; 1075 1076 case BR_NOOP: 1077 break; 1078 1079 case BR_SPAWN_LOOPER: 1080 mProcess->spawnPooledThread(false); 1081 break; 1082 1083 default: 1084 printf("*** BAD COMMAND %d received from Binder driver\n", cmd); 1085 result = UNKNOWN_ERROR; 1086 break; 1087 } 1088 1089 if (result != NO_ERROR) { 1090 mLastError = result; 1091 } 1092 1093 return result; 1094 } 1095 1096 void IPCThreadState::threadDestructor(void *st) 1097 { 1098 IPCThreadState* const self = static_cast<IPCThreadState*>(st); 1099 if (self) { 1100 self->flushCommands(); 1101 #if defined(HAVE_ANDROID_OS) 1102 ioctl(self->mProcess->mDriverFD, BINDER_THREAD_EXIT, 0); 1103 #endif 1104 delete self; 1105 } 1106 } 1107 1108 1109 void IPCThreadState::freeBuffer(Parcel* parcel, const uint8_t* data, size_t dataSize, 1110 const size_t* objects, size_t objectsSize, 1111 void* cookie) 1112 { 1113 //LOGI("Freeing parcel %p", &parcel); 1114 IF_LOG_COMMANDS() { 1115 alog << "Writing BC_FREE_BUFFER for " << data << endl; 1116 } 1117 LOG_ASSERT(data != NULL, "Called with NULL data"); 1118 if (parcel != NULL) parcel->closeFileDescriptors(); 1119 IPCThreadState* state = self(); 1120 state->mOut.writeInt32(BC_FREE_BUFFER); 1121 state->mOut.writeInt32((int32_t)data); 1122 } 1123 1124 }; // namespace android 1125
