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_ALOG(LOG_VERBOSE, "transact") 60 #define IF_LOG_COMMANDS() IF_ALOG(LOG_VERBOSE, "ipc") 61 #define LOG_REMOTEREFS(...) ALOG(LOG_DEBUG, "remoterefs", __VA_ARGS__) 62 #define IF_LOG_REMOTEREFS() IF_ALOG(LOG_DEBUG, "remoterefs") 63 #define LOG_THREADPOOL(...) ALOG(LOG_DEBUG, "threadpool", __VA_ARGS__) 64 #define LOG_ONEWAY(...) ALOG(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 foreground 428 // one to avoid performing an initial transaction in the background. 429 set_sched_policy(mMyThreadId, SP_FOREGROUND); 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 } else if (result != TIMED_OUT && result != -ECONNREFUSED && result != -EBADF) { 470 ALOGE("talkWithDriver(fd=%d) returned unexpected error %d, aborting", 471 mProcess->mDriverFD, result); 472 abort(); 473 } 474 475 // After executing the command, ensure that the thread is returned to the 476 // foreground cgroup before rejoining the pool. The driver takes care of 477 // restoring the priority, but doesn't do anything with cgroups so we 478 // need to take care of that here in userspace. Note that we do make 479 // sure to go in the foreground after executing a transaction, but 480 // there are other callbacks into user code that could have changed 481 // our group so we want to make absolutely sure it is put back. 482 set_sched_policy(mMyThreadId, SP_FOREGROUND); 483 484 // Let this thread exit the thread pool if it is no longer 485 // needed and it is not the main process thread. 486 if(result == TIMED_OUT && !isMain) { 487 break; 488 } 489 } while (result != -ECONNREFUSED && result != -EBADF); 490 491 LOG_THREADPOOL("**** THREAD %p (PID %d) IS LEAVING THE THREAD POOL err=%p\n", 492 (void*)pthread_self(), getpid(), (void*)result); 493 494 mOut.writeInt32(BC_EXIT_LOOPER); 495 talkWithDriver(false); 496 } 497 498 void IPCThreadState::stopProcess(bool immediate) 499 { 500 //ALOGI("**** STOPPING PROCESS"); 501 flushCommands(); 502 int fd = mProcess->mDriverFD; 503 mProcess->mDriverFD = -1; 504 close(fd); 505 //kill(getpid(), SIGKILL); 506 } 507 508 status_t IPCThreadState::transact(int32_t handle, 509 uint32_t code, const Parcel& data, 510 Parcel* reply, uint32_t flags) 511 { 512 status_t err = data.errorCheck(); 513 514 flags |= TF_ACCEPT_FDS; 515 516 IF_LOG_TRANSACTIONS() { 517 TextOutput::Bundle _b(alog); 518 alog << "BC_TRANSACTION thr " << (void*)pthread_self() << " / hand " 519 << handle << " / code " << TypeCode(code) << ": " 520 << indent << data << dedent << endl; 521 } 522 523 if (err == NO_ERROR) { 524 LOG_ONEWAY(">>>> SEND from pid %d uid %d %s", getpid(), getuid(), 525 (flags & TF_ONE_WAY) == 0 ? "READ REPLY" : "ONE WAY"); 526 err = writeTransactionData(BC_TRANSACTION, flags, handle, code, data, NULL); 527 } 528 529 if (err != NO_ERROR) { 530 if (reply) reply->setError(err); 531 return (mLastError = err); 532 } 533 534 if ((flags & TF_ONE_WAY) == 0) { 535 #if 0 536 if (code == 4) { // relayout 537 ALOGI(">>>>>> CALLING transaction 4"); 538 } else { 539 ALOGI(">>>>>> CALLING transaction %d", code); 540 } 541 #endif 542 if (reply) { 543 err = waitForResponse(reply); 544 } else { 545 Parcel fakeReply; 546 err = waitForResponse(&fakeReply); 547 } 548 #if 0 549 if (code == 4) { // relayout 550 ALOGI("<<<<<< RETURNING transaction 4"); 551 } else { 552 ALOGI("<<<<<< RETURNING transaction %d", code); 553 } 554 #endif 555 556 IF_LOG_TRANSACTIONS() { 557 TextOutput::Bundle _b(alog); 558 alog << "BR_REPLY thr " << (void*)pthread_self() << " / hand " 559 << handle << ": "; 560 if (reply) alog << indent << *reply << dedent << endl; 561 else alog << "(none requested)" << endl; 562 } 563 } else { 564 err = waitForResponse(NULL, NULL); 565 } 566 567 return err; 568 } 569 570 void IPCThreadState::incStrongHandle(int32_t handle) 571 { 572 LOG_REMOTEREFS("IPCThreadState::incStrongHandle(%d)\n", handle); 573 mOut.writeInt32(BC_ACQUIRE); 574 mOut.writeInt32(handle); 575 } 576 577 void IPCThreadState::decStrongHandle(int32_t handle) 578 { 579 LOG_REMOTEREFS("IPCThreadState::decStrongHandle(%d)\n", handle); 580 mOut.writeInt32(BC_RELEASE); 581 mOut.writeInt32(handle); 582 } 583 584 void IPCThreadState::incWeakHandle(int32_t handle) 585 { 586 LOG_REMOTEREFS("IPCThreadState::incWeakHandle(%d)\n", handle); 587 mOut.writeInt32(BC_INCREFS); 588 mOut.writeInt32(handle); 589 } 590 591 void IPCThreadState::decWeakHandle(int32_t handle) 592 { 593 LOG_REMOTEREFS("IPCThreadState::decWeakHandle(%d)\n", handle); 594 mOut.writeInt32(BC_DECREFS); 595 mOut.writeInt32(handle); 596 } 597 598 status_t IPCThreadState::attemptIncStrongHandle(int32_t handle) 599 { 600 LOG_REMOTEREFS("IPCThreadState::attemptIncStrongHandle(%d)\n", handle); 601 mOut.writeInt32(BC_ATTEMPT_ACQUIRE); 602 mOut.writeInt32(0); // xxx was thread priority 603 mOut.writeInt32(handle); 604 status_t result = UNKNOWN_ERROR; 605 606 waitForResponse(NULL, &result); 607 608 #if LOG_REFCOUNTS 609 printf("IPCThreadState::attemptIncStrongHandle(%ld) = %s\n", 610 handle, result == NO_ERROR ? "SUCCESS" : "FAILURE"); 611 #endif 612 613 return result; 614 } 615 616 void IPCThreadState::expungeHandle(int32_t handle, IBinder* binder) 617 { 618 #if LOG_REFCOUNTS 619 printf("IPCThreadState::expungeHandle(%ld)\n", handle); 620 #endif 621 self()->mProcess->expungeHandle(handle, binder); 622 } 623 624 status_t IPCThreadState::requestDeathNotification(int32_t handle, BpBinder* proxy) 625 { 626 mOut.writeInt32(BC_REQUEST_DEATH_NOTIFICATION); 627 mOut.writeInt32((int32_t)handle); 628 mOut.writeInt32((int32_t)proxy); 629 return NO_ERROR; 630 } 631 632 status_t IPCThreadState::clearDeathNotification(int32_t handle, BpBinder* proxy) 633 { 634 mOut.writeInt32(BC_CLEAR_DEATH_NOTIFICATION); 635 mOut.writeInt32((int32_t)handle); 636 mOut.writeInt32((int32_t)proxy); 637 return NO_ERROR; 638 } 639 640 IPCThreadState::IPCThreadState() 641 : mProcess(ProcessState::self()), 642 mMyThreadId(androidGetTid()), 643 mStrictModePolicy(0), 644 mLastTransactionBinderFlags(0) 645 { 646 pthread_setspecific(gTLS, this); 647 clearCaller(); 648 mIn.setDataCapacity(256); 649 mOut.setDataCapacity(256); 650 } 651 652 IPCThreadState::~IPCThreadState() 653 { 654 } 655 656 status_t IPCThreadState::sendReply(const Parcel& reply, uint32_t flags) 657 { 658 status_t err; 659 status_t statusBuffer; 660 err = writeTransactionData(BC_REPLY, flags, -1, 0, reply, &statusBuffer); 661 if (err < NO_ERROR) return err; 662 663 return waitForResponse(NULL, NULL); 664 } 665 666 status_t IPCThreadState::waitForResponse(Parcel *reply, status_t *acquireResult) 667 { 668 int32_t cmd; 669 int32_t err; 670 671 while (1) { 672 if ((err=talkWithDriver()) < NO_ERROR) break; 673 err = mIn.errorCheck(); 674 if (err < NO_ERROR) break; 675 if (mIn.dataAvail() == 0) continue; 676 677 cmd = mIn.readInt32(); 678 679 IF_LOG_COMMANDS() { 680 alog << "Processing waitForResponse Command: " 681 << getReturnString(cmd) << endl; 682 } 683 684 switch (cmd) { 685 case BR_TRANSACTION_COMPLETE: 686 if (!reply && !acquireResult) goto finish; 687 break; 688 689 case BR_DEAD_REPLY: 690 err = DEAD_OBJECT; 691 goto finish; 692 693 case BR_FAILED_REPLY: 694 err = FAILED_TRANSACTION; 695 goto finish; 696 697 case BR_ACQUIRE_RESULT: 698 { 699 ALOG_ASSERT(acquireResult != NULL, "Unexpected brACQUIRE_RESULT"); 700 const int32_t result = mIn.readInt32(); 701 if (!acquireResult) continue; 702 *acquireResult = result ? NO_ERROR : INVALID_OPERATION; 703 } 704 goto finish; 705 706 case BR_REPLY: 707 { 708 binder_transaction_data tr; 709 err = mIn.read(&tr, sizeof(tr)); 710 ALOG_ASSERT(err == NO_ERROR, "Not enough command data for brREPLY"); 711 if (err != NO_ERROR) goto finish; 712 713 if (reply) { 714 if ((tr.flags & TF_STATUS_CODE) == 0) { 715 reply->ipcSetDataReference( 716 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 717 tr.data_size, 718 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 719 tr.offsets_size/sizeof(size_t), 720 freeBuffer, this); 721 } else { 722 err = *static_cast<const status_t*>(tr.data.ptr.buffer); 723 freeBuffer(NULL, 724 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 725 tr.data_size, 726 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 727 tr.offsets_size/sizeof(size_t), this); 728 } 729 } else { 730 freeBuffer(NULL, 731 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 732 tr.data_size, 733 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 734 tr.offsets_size/sizeof(size_t), this); 735 continue; 736 } 737 } 738 goto finish; 739 740 default: 741 err = executeCommand(cmd); 742 if (err != NO_ERROR) goto finish; 743 break; 744 } 745 } 746 747 finish: 748 if (err != NO_ERROR) { 749 if (acquireResult) *acquireResult = err; 750 if (reply) reply->setError(err); 751 mLastError = err; 752 } 753 754 return err; 755 } 756 757 status_t IPCThreadState::talkWithDriver(bool doReceive) 758 { 759 if (mProcess->mDriverFD <= 0) { 760 return -EBADF; 761 } 762 763 binder_write_read bwr; 764 765 // Is the read buffer empty? 766 const bool needRead = mIn.dataPosition() >= mIn.dataSize(); 767 768 // We don't want to write anything if we are still reading 769 // from data left in the input buffer and the caller 770 // has requested to read the next data. 771 const size_t outAvail = (!doReceive || needRead) ? mOut.dataSize() : 0; 772 773 bwr.write_size = outAvail; 774 bwr.write_buffer = (long unsigned int)mOut.data(); 775 776 // This is what we'll read. 777 if (doReceive && needRead) { 778 bwr.read_size = mIn.dataCapacity(); 779 bwr.read_buffer = (long unsigned int)mIn.data(); 780 } else { 781 bwr.read_size = 0; 782 bwr.read_buffer = 0; 783 } 784 785 IF_LOG_COMMANDS() { 786 TextOutput::Bundle _b(alog); 787 if (outAvail != 0) { 788 alog << "Sending commands to driver: " << indent; 789 const void* cmds = (const void*)bwr.write_buffer; 790 const void* end = ((const uint8_t*)cmds)+bwr.write_size; 791 alog << HexDump(cmds, bwr.write_size) << endl; 792 while (cmds < end) cmds = printCommand(alog, cmds); 793 alog << dedent; 794 } 795 alog << "Size of receive buffer: " << bwr.read_size 796 << ", needRead: " << needRead << ", doReceive: " << doReceive << endl; 797 } 798 799 // Return immediately if there is nothing to do. 800 if ((bwr.write_size == 0) && (bwr.read_size == 0)) return NO_ERROR; 801 802 bwr.write_consumed = 0; 803 bwr.read_consumed = 0; 804 status_t err; 805 do { 806 IF_LOG_COMMANDS() { 807 alog << "About to read/write, write size = " << mOut.dataSize() << endl; 808 } 809 #if defined(HAVE_ANDROID_OS) 810 if (ioctl(mProcess->mDriverFD, BINDER_WRITE_READ, &bwr) >= 0) 811 err = NO_ERROR; 812 else 813 err = -errno; 814 #else 815 err = INVALID_OPERATION; 816 #endif 817 if (mProcess->mDriverFD <= 0) { 818 err = -EBADF; 819 } 820 IF_LOG_COMMANDS() { 821 alog << "Finished read/write, write size = " << mOut.dataSize() << endl; 822 } 823 } while (err == -EINTR); 824 825 IF_LOG_COMMANDS() { 826 alog << "Our err: " << (void*)err << ", write consumed: " 827 << bwr.write_consumed << " (of " << mOut.dataSize() 828 << "), read consumed: " << bwr.read_consumed << endl; 829 } 830 831 if (err >= NO_ERROR) { 832 if (bwr.write_consumed > 0) { 833 if (bwr.write_consumed < (ssize_t)mOut.dataSize()) 834 mOut.remove(0, bwr.write_consumed); 835 else 836 mOut.setDataSize(0); 837 } 838 if (bwr.read_consumed > 0) { 839 mIn.setDataSize(bwr.read_consumed); 840 mIn.setDataPosition(0); 841 } 842 IF_LOG_COMMANDS() { 843 TextOutput::Bundle _b(alog); 844 alog << "Remaining data size: " << mOut.dataSize() << endl; 845 alog << "Received commands from driver: " << indent; 846 const void* cmds = mIn.data(); 847 const void* end = mIn.data() + mIn.dataSize(); 848 alog << HexDump(cmds, mIn.dataSize()) << endl; 849 while (cmds < end) cmds = printReturnCommand(alog, cmds); 850 alog << dedent; 851 } 852 return NO_ERROR; 853 } 854 855 return err; 856 } 857 858 status_t IPCThreadState::writeTransactionData(int32_t cmd, uint32_t binderFlags, 859 int32_t handle, uint32_t code, const Parcel& data, status_t* statusBuffer) 860 { 861 binder_transaction_data tr; 862 863 tr.target.handle = handle; 864 tr.code = code; 865 tr.flags = binderFlags; 866 tr.cookie = 0; 867 tr.sender_pid = 0; 868 tr.sender_euid = 0; 869 870 const status_t err = data.errorCheck(); 871 if (err == NO_ERROR) { 872 tr.data_size = data.ipcDataSize(); 873 tr.data.ptr.buffer = data.ipcData(); 874 tr.offsets_size = data.ipcObjectsCount()*sizeof(size_t); 875 tr.data.ptr.offsets = data.ipcObjects(); 876 } else if (statusBuffer) { 877 tr.flags |= TF_STATUS_CODE; 878 *statusBuffer = err; 879 tr.data_size = sizeof(status_t); 880 tr.data.ptr.buffer = statusBuffer; 881 tr.offsets_size = 0; 882 tr.data.ptr.offsets = NULL; 883 } else { 884 return (mLastError = err); 885 } 886 887 mOut.writeInt32(cmd); 888 mOut.write(&tr, sizeof(tr)); 889 890 return NO_ERROR; 891 } 892 893 sp<BBinder> the_context_object; 894 895 void setTheContextObject(sp<BBinder> obj) 896 { 897 the_context_object = obj; 898 } 899 900 status_t IPCThreadState::executeCommand(int32_t cmd) 901 { 902 BBinder* obj; 903 RefBase::weakref_type* refs; 904 status_t result = NO_ERROR; 905 906 switch (cmd) { 907 case BR_ERROR: 908 result = mIn.readInt32(); 909 break; 910 911 case BR_OK: 912 break; 913 914 case BR_ACQUIRE: 915 refs = (RefBase::weakref_type*)mIn.readInt32(); 916 obj = (BBinder*)mIn.readInt32(); 917 ALOG_ASSERT(refs->refBase() == obj, 918 "BR_ACQUIRE: object %p does not match cookie %p (expected %p)", 919 refs, obj, refs->refBase()); 920 obj->incStrong(mProcess.get()); 921 IF_LOG_REMOTEREFS() { 922 LOG_REMOTEREFS("BR_ACQUIRE from driver on %p", obj); 923 obj->printRefs(); 924 } 925 mOut.writeInt32(BC_ACQUIRE_DONE); 926 mOut.writeInt32((int32_t)refs); 927 mOut.writeInt32((int32_t)obj); 928 break; 929 930 case BR_RELEASE: 931 refs = (RefBase::weakref_type*)mIn.readInt32(); 932 obj = (BBinder*)mIn.readInt32(); 933 ALOG_ASSERT(refs->refBase() == obj, 934 "BR_RELEASE: object %p does not match cookie %p (expected %p)", 935 refs, obj, refs->refBase()); 936 IF_LOG_REMOTEREFS() { 937 LOG_REMOTEREFS("BR_RELEASE from driver on %p", obj); 938 obj->printRefs(); 939 } 940 mPendingStrongDerefs.push(obj); 941 break; 942 943 case BR_INCREFS: 944 refs = (RefBase::weakref_type*)mIn.readInt32(); 945 obj = (BBinder*)mIn.readInt32(); 946 refs->incWeak(mProcess.get()); 947 mOut.writeInt32(BC_INCREFS_DONE); 948 mOut.writeInt32((int32_t)refs); 949 mOut.writeInt32((int32_t)obj); 950 break; 951 952 case BR_DECREFS: 953 refs = (RefBase::weakref_type*)mIn.readInt32(); 954 obj = (BBinder*)mIn.readInt32(); 955 // NOTE: This assertion is not valid, because the object may no 956 // longer exist (thus the (BBinder*)cast above resulting in a different 957 // memory address). 958 //ALOG_ASSERT(refs->refBase() == obj, 959 // "BR_DECREFS: object %p does not match cookie %p (expected %p)", 960 // refs, obj, refs->refBase()); 961 mPendingWeakDerefs.push(refs); 962 break; 963 964 case BR_ATTEMPT_ACQUIRE: 965 refs = (RefBase::weakref_type*)mIn.readInt32(); 966 obj = (BBinder*)mIn.readInt32(); 967 968 { 969 const bool success = refs->attemptIncStrong(mProcess.get()); 970 ALOG_ASSERT(success && refs->refBase() == obj, 971 "BR_ATTEMPT_ACQUIRE: object %p does not match cookie %p (expected %p)", 972 refs, obj, refs->refBase()); 973 974 mOut.writeInt32(BC_ACQUIRE_RESULT); 975 mOut.writeInt32((int32_t)success); 976 } 977 break; 978 979 case BR_TRANSACTION: 980 { 981 binder_transaction_data tr; 982 result = mIn.read(&tr, sizeof(tr)); 983 ALOG_ASSERT(result == NO_ERROR, 984 "Not enough command data for brTRANSACTION"); 985 if (result != NO_ERROR) break; 986 987 Parcel buffer; 988 buffer.ipcSetDataReference( 989 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 990 tr.data_size, 991 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 992 tr.offsets_size/sizeof(size_t), freeBuffer, this); 993 994 const pid_t origPid = mCallingPid; 995 const uid_t origUid = mCallingUid; 996 997 mCallingPid = tr.sender_pid; 998 mCallingUid = tr.sender_euid; 999 1000 int curPrio = getpriority(PRIO_PROCESS, mMyThreadId); 1001 if (gDisableBackgroundScheduling) { 1002 if (curPrio > ANDROID_PRIORITY_NORMAL) { 1003 // We have inherited a reduced priority from the caller, but do not 1004 // want to run in that state in this process. The driver set our 1005 // priority already (though not our scheduling class), so bounce 1006 // it back to the default before invoking the transaction. 1007 setpriority(PRIO_PROCESS, mMyThreadId, ANDROID_PRIORITY_NORMAL); 1008 } 1009 } else { 1010 if (curPrio >= ANDROID_PRIORITY_BACKGROUND) { 1011 // We want to use the inherited priority from the caller. 1012 // Ensure this thread is in the background scheduling class, 1013 // since the driver won't modify scheduling classes for us. 1014 // The scheduling group is reset to default by the caller 1015 // once this method returns after the transaction is complete. 1016 set_sched_policy(mMyThreadId, SP_BACKGROUND); 1017 } 1018 } 1019 1020 //ALOGI(">>>> TRANSACT from pid %d uid %d\n", mCallingPid, mCallingUid); 1021 1022 Parcel reply; 1023 IF_LOG_TRANSACTIONS() { 1024 TextOutput::Bundle _b(alog); 1025 alog << "BR_TRANSACTION thr " << (void*)pthread_self() 1026 << " / obj " << tr.target.ptr << " / code " 1027 << TypeCode(tr.code) << ": " << indent << buffer 1028 << dedent << endl 1029 << "Data addr = " 1030 << reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer) 1031 << ", offsets addr=" 1032 << reinterpret_cast<const size_t*>(tr.data.ptr.offsets) << endl; 1033 } 1034 if (tr.target.ptr) { 1035 sp<BBinder> b((BBinder*)tr.cookie); 1036 const status_t error = b->transact(tr.code, buffer, &reply, tr.flags); 1037 if (error < NO_ERROR) reply.setError(error); 1038 1039 } else { 1040 const status_t error = the_context_object->transact(tr.code, buffer, &reply, tr.flags); 1041 if (error < NO_ERROR) reply.setError(error); 1042 } 1043 1044 //ALOGI("<<<< TRANSACT from pid %d restore pid %d uid %d\n", 1045 // mCallingPid, origPid, origUid); 1046 1047 if ((tr.flags & TF_ONE_WAY) == 0) { 1048 LOG_ONEWAY("Sending reply to %d!", mCallingPid); 1049 sendReply(reply, 0); 1050 } else { 1051 LOG_ONEWAY("NOT sending reply to %d!", mCallingPid); 1052 } 1053 1054 mCallingPid = origPid; 1055 mCallingUid = origUid; 1056 1057 IF_LOG_TRANSACTIONS() { 1058 TextOutput::Bundle _b(alog); 1059 alog << "BC_REPLY thr " << (void*)pthread_self() << " / obj " 1060 << tr.target.ptr << ": " << indent << reply << dedent << endl; 1061 } 1062 1063 } 1064 break; 1065 1066 case BR_DEAD_BINDER: 1067 { 1068 BpBinder *proxy = (BpBinder*)mIn.readInt32(); 1069 proxy->sendObituary(); 1070 mOut.writeInt32(BC_DEAD_BINDER_DONE); 1071 mOut.writeInt32((int32_t)proxy); 1072 } break; 1073 1074 case BR_CLEAR_DEATH_NOTIFICATION_DONE: 1075 { 1076 BpBinder *proxy = (BpBinder*)mIn.readInt32(); 1077 proxy->getWeakRefs()->decWeak(proxy); 1078 } break; 1079 1080 case BR_FINISHED: 1081 result = TIMED_OUT; 1082 break; 1083 1084 case BR_NOOP: 1085 break; 1086 1087 case BR_SPAWN_LOOPER: 1088 mProcess->spawnPooledThread(false); 1089 break; 1090 1091 default: 1092 printf("*** BAD COMMAND %d received from Binder driver\n", cmd); 1093 result = UNKNOWN_ERROR; 1094 break; 1095 } 1096 1097 if (result != NO_ERROR) { 1098 mLastError = result; 1099 } 1100 1101 return result; 1102 } 1103 1104 void IPCThreadState::threadDestructor(void *st) 1105 { 1106 IPCThreadState* const self = static_cast<IPCThreadState*>(st); 1107 if (self) { 1108 self->flushCommands(); 1109 #if defined(HAVE_ANDROID_OS) 1110 if (self->mProcess->mDriverFD > 0) { 1111 ioctl(self->mProcess->mDriverFD, BINDER_THREAD_EXIT, 0); 1112 } 1113 #endif 1114 delete self; 1115 } 1116 } 1117 1118 1119 void IPCThreadState::freeBuffer(Parcel* parcel, const uint8_t* data, size_t dataSize, 1120 const size_t* objects, size_t objectsSize, 1121 void* cookie) 1122 { 1123 //ALOGI("Freeing parcel %p", &parcel); 1124 IF_LOG_COMMANDS() { 1125 alog << "Writing BC_FREE_BUFFER for " << data << endl; 1126 } 1127 ALOG_ASSERT(data != NULL, "Called with NULL data"); 1128 if (parcel != NULL) parcel->closeFileDescriptors(); 1129 IPCThreadState* state = self(); 1130 state->mOut.writeInt32(BC_FREE_BUFFER); 1131 state->mOut.writeInt32((int32_t)data); 1132 } 1133 1134 }; // namespace android 1135
