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 int IPCThreadState::getOrigCallingUid() 375 { 376 return mOrigCallingUid; 377 } 378 379 int64_t IPCThreadState::clearCallingIdentity() 380 { 381 int64_t token = ((int64_t)mCallingUid<<32) | mCallingPid; 382 clearCaller(); 383 return token; 384 } 385 386 void IPCThreadState::setStrictModePolicy(int32_t policy) 387 { 388 mStrictModePolicy = policy; 389 } 390 391 int32_t IPCThreadState::getStrictModePolicy() const 392 { 393 return mStrictModePolicy; 394 } 395 396 void IPCThreadState::setLastTransactionBinderFlags(int32_t flags) 397 { 398 mLastTransactionBinderFlags = flags; 399 } 400 401 int32_t IPCThreadState::getLastTransactionBinderFlags() const 402 { 403 return mLastTransactionBinderFlags; 404 } 405 406 void IPCThreadState::restoreCallingIdentity(int64_t token) 407 { 408 mCallingUid = (int)(token>>32); 409 mCallingPid = (int)token; 410 } 411 412 void IPCThreadState::clearCaller() 413 { 414 mCallingPid = getpid(); 415 mCallingUid = getuid(); 416 } 417 418 void IPCThreadState::flushCommands() 419 { 420 if (mProcess->mDriverFD <= 0) 421 return; 422 talkWithDriver(false); 423 } 424 425 void IPCThreadState::joinThreadPool(bool isMain) 426 { 427 LOG_THREADPOOL("**** THREAD %p (PID %d) IS JOINING THE THREAD POOL\n", (void*)pthread_self(), getpid()); 428 429 mOut.writeInt32(isMain ? BC_ENTER_LOOPER : BC_REGISTER_LOOPER); 430 431 // This thread may have been spawned by a thread that was in the background 432 // scheduling group, so first we will make sure it is in the foreground 433 // one to avoid performing an initial transaction in the background. 434 set_sched_policy(mMyThreadId, SP_FOREGROUND); 435 436 status_t result; 437 do { 438 int32_t cmd; 439 440 // When we've cleared the incoming command queue, process any pending derefs 441 if (mIn.dataPosition() >= mIn.dataSize()) { 442 size_t numPending = mPendingWeakDerefs.size(); 443 if (numPending > 0) { 444 for (size_t i = 0; i < numPending; i++) { 445 RefBase::weakref_type* refs = mPendingWeakDerefs[i]; 446 refs->decWeak(mProcess.get()); 447 } 448 mPendingWeakDerefs.clear(); 449 } 450 451 numPending = mPendingStrongDerefs.size(); 452 if (numPending > 0) { 453 for (size_t i = 0; i < numPending; i++) { 454 BBinder* obj = mPendingStrongDerefs[i]; 455 obj->decStrong(mProcess.get()); 456 } 457 mPendingStrongDerefs.clear(); 458 } 459 } 460 461 // now get the next command to be processed, waiting if necessary 462 result = talkWithDriver(); 463 if (result >= NO_ERROR) { 464 size_t IN = mIn.dataAvail(); 465 if (IN < sizeof(int32_t)) continue; 466 cmd = mIn.readInt32(); 467 IF_LOG_COMMANDS() { 468 alog << "Processing top-level Command: " 469 << getReturnString(cmd) << endl; 470 } 471 472 473 result = executeCommand(cmd); 474 } 475 476 // After executing the command, ensure that the thread is returned to the 477 // foreground cgroup before rejoining the pool. The driver takes care of 478 // restoring the priority, but doesn't do anything with cgroups so we 479 // need to take care of that here in userspace. Note that we do make 480 // sure to go in the foreground after executing a transaction, but 481 // there are other callbacks into user code that could have changed 482 // our group so we want to make absolutely sure it is put back. 483 set_sched_policy(mMyThreadId, SP_FOREGROUND); 484 485 // Let this thread exit the thread pool if it is no longer 486 // needed and it is not the main process thread. 487 if(result == TIMED_OUT && !isMain) { 488 break; 489 } 490 } while (result != -ECONNREFUSED && result != -EBADF); 491 492 LOG_THREADPOOL("**** THREAD %p (PID %d) IS LEAVING THE THREAD POOL err=%p\n", 493 (void*)pthread_self(), getpid(), (void*)result); 494 495 mOut.writeInt32(BC_EXIT_LOOPER); 496 talkWithDriver(false); 497 } 498 499 void IPCThreadState::stopProcess(bool immediate) 500 { 501 //ALOGI("**** STOPPING PROCESS"); 502 flushCommands(); 503 int fd = mProcess->mDriverFD; 504 mProcess->mDriverFD = -1; 505 close(fd); 506 //kill(getpid(), SIGKILL); 507 } 508 509 status_t IPCThreadState::transact(int32_t handle, 510 uint32_t code, const Parcel& data, 511 Parcel* reply, uint32_t flags) 512 { 513 status_t err = data.errorCheck(); 514 515 flags |= TF_ACCEPT_FDS; 516 517 IF_LOG_TRANSACTIONS() { 518 TextOutput::Bundle _b(alog); 519 alog << "BC_TRANSACTION thr " << (void*)pthread_self() << " / hand " 520 << handle << " / code " << TypeCode(code) << ": " 521 << indent << data << dedent << endl; 522 } 523 524 if (err == NO_ERROR) { 525 LOG_ONEWAY(">>>> SEND from pid %d uid %d %s", getpid(), getuid(), 526 (flags & TF_ONE_WAY) == 0 ? "READ REPLY" : "ONE WAY"); 527 err = writeTransactionData(BC_TRANSACTION, flags, handle, code, data, NULL); 528 } 529 530 if (err != NO_ERROR) { 531 if (reply) reply->setError(err); 532 return (mLastError = err); 533 } 534 535 if ((flags & TF_ONE_WAY) == 0) { 536 #if 0 537 if (code == 4) { // relayout 538 ALOGI(">>>>>> CALLING transaction 4"); 539 } else { 540 ALOGI(">>>>>> CALLING transaction %d", code); 541 } 542 #endif 543 if (reply) { 544 err = waitForResponse(reply); 545 } else { 546 Parcel fakeReply; 547 err = waitForResponse(&fakeReply); 548 } 549 #if 0 550 if (code == 4) { // relayout 551 ALOGI("<<<<<< RETURNING transaction 4"); 552 } else { 553 ALOGI("<<<<<< RETURNING transaction %d", code); 554 } 555 #endif 556 557 IF_LOG_TRANSACTIONS() { 558 TextOutput::Bundle _b(alog); 559 alog << "BR_REPLY thr " << (void*)pthread_self() << " / hand " 560 << handle << ": "; 561 if (reply) alog << indent << *reply << dedent << endl; 562 else alog << "(none requested)" << endl; 563 } 564 } else { 565 err = waitForResponse(NULL, NULL); 566 } 567 568 return err; 569 } 570 571 void IPCThreadState::incStrongHandle(int32_t handle) 572 { 573 LOG_REMOTEREFS("IPCThreadState::incStrongHandle(%d)\n", handle); 574 mOut.writeInt32(BC_ACQUIRE); 575 mOut.writeInt32(handle); 576 } 577 578 void IPCThreadState::decStrongHandle(int32_t handle) 579 { 580 LOG_REMOTEREFS("IPCThreadState::decStrongHandle(%d)\n", handle); 581 mOut.writeInt32(BC_RELEASE); 582 mOut.writeInt32(handle); 583 } 584 585 void IPCThreadState::incWeakHandle(int32_t handle) 586 { 587 LOG_REMOTEREFS("IPCThreadState::incWeakHandle(%d)\n", handle); 588 mOut.writeInt32(BC_INCREFS); 589 mOut.writeInt32(handle); 590 } 591 592 void IPCThreadState::decWeakHandle(int32_t handle) 593 { 594 LOG_REMOTEREFS("IPCThreadState::decWeakHandle(%d)\n", handle); 595 mOut.writeInt32(BC_DECREFS); 596 mOut.writeInt32(handle); 597 } 598 599 status_t IPCThreadState::attemptIncStrongHandle(int32_t handle) 600 { 601 LOG_REMOTEREFS("IPCThreadState::attemptIncStrongHandle(%d)\n", handle); 602 mOut.writeInt32(BC_ATTEMPT_ACQUIRE); 603 mOut.writeInt32(0); // xxx was thread priority 604 mOut.writeInt32(handle); 605 status_t result = UNKNOWN_ERROR; 606 607 waitForResponse(NULL, &result); 608 609 #if LOG_REFCOUNTS 610 printf("IPCThreadState::attemptIncStrongHandle(%ld) = %s\n", 611 handle, result == NO_ERROR ? "SUCCESS" : "FAILURE"); 612 #endif 613 614 return result; 615 } 616 617 void IPCThreadState::expungeHandle(int32_t handle, IBinder* binder) 618 { 619 #if LOG_REFCOUNTS 620 printf("IPCThreadState::expungeHandle(%ld)\n", handle); 621 #endif 622 self()->mProcess->expungeHandle(handle, binder); 623 } 624 625 status_t IPCThreadState::requestDeathNotification(int32_t handle, BpBinder* proxy) 626 { 627 mOut.writeInt32(BC_REQUEST_DEATH_NOTIFICATION); 628 mOut.writeInt32((int32_t)handle); 629 mOut.writeInt32((int32_t)proxy); 630 return NO_ERROR; 631 } 632 633 status_t IPCThreadState::clearDeathNotification(int32_t handle, BpBinder* proxy) 634 { 635 mOut.writeInt32(BC_CLEAR_DEATH_NOTIFICATION); 636 mOut.writeInt32((int32_t)handle); 637 mOut.writeInt32((int32_t)proxy); 638 return NO_ERROR; 639 } 640 641 IPCThreadState::IPCThreadState() 642 : mProcess(ProcessState::self()), 643 mMyThreadId(androidGetTid()), 644 mStrictModePolicy(0), 645 mLastTransactionBinderFlags(0) 646 { 647 pthread_setspecific(gTLS, this); 648 clearCaller(); 649 mOrigCallingUid = mCallingUid; 650 mIn.setDataCapacity(256); 651 mOut.setDataCapacity(256); 652 } 653 654 IPCThreadState::~IPCThreadState() 655 { 656 } 657 658 status_t IPCThreadState::sendReply(const Parcel& reply, uint32_t flags) 659 { 660 status_t err; 661 status_t statusBuffer; 662 err = writeTransactionData(BC_REPLY, flags, -1, 0, reply, &statusBuffer); 663 if (err < NO_ERROR) return err; 664 665 return waitForResponse(NULL, NULL); 666 } 667 668 status_t IPCThreadState::waitForResponse(Parcel *reply, status_t *acquireResult) 669 { 670 int32_t cmd; 671 int32_t err; 672 673 while (1) { 674 if ((err=talkWithDriver()) < NO_ERROR) break; 675 err = mIn.errorCheck(); 676 if (err < NO_ERROR) break; 677 if (mIn.dataAvail() == 0) continue; 678 679 cmd = mIn.readInt32(); 680 681 IF_LOG_COMMANDS() { 682 alog << "Processing waitForResponse Command: " 683 << getReturnString(cmd) << endl; 684 } 685 686 switch (cmd) { 687 case BR_TRANSACTION_COMPLETE: 688 if (!reply && !acquireResult) goto finish; 689 break; 690 691 case BR_DEAD_REPLY: 692 err = DEAD_OBJECT; 693 goto finish; 694 695 case BR_FAILED_REPLY: 696 err = FAILED_TRANSACTION; 697 goto finish; 698 699 case BR_ACQUIRE_RESULT: 700 { 701 ALOG_ASSERT(acquireResult != NULL, "Unexpected brACQUIRE_RESULT"); 702 const int32_t result = mIn.readInt32(); 703 if (!acquireResult) continue; 704 *acquireResult = result ? NO_ERROR : INVALID_OPERATION; 705 } 706 goto finish; 707 708 case BR_REPLY: 709 { 710 binder_transaction_data tr; 711 err = mIn.read(&tr, sizeof(tr)); 712 ALOG_ASSERT(err == NO_ERROR, "Not enough command data for brREPLY"); 713 if (err != NO_ERROR) goto finish; 714 715 if (reply) { 716 if ((tr.flags & TF_STATUS_CODE) == 0) { 717 reply->ipcSetDataReference( 718 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 719 tr.data_size, 720 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 721 tr.offsets_size/sizeof(size_t), 722 freeBuffer, this); 723 } else { 724 err = *static_cast<const status_t*>(tr.data.ptr.buffer); 725 freeBuffer(NULL, 726 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 727 tr.data_size, 728 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 729 tr.offsets_size/sizeof(size_t), this); 730 } 731 } else { 732 freeBuffer(NULL, 733 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 734 tr.data_size, 735 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 736 tr.offsets_size/sizeof(size_t), this); 737 continue; 738 } 739 } 740 goto finish; 741 742 default: 743 err = executeCommand(cmd); 744 if (err != NO_ERROR) goto finish; 745 break; 746 } 747 } 748 749 finish: 750 if (err != NO_ERROR) { 751 if (acquireResult) *acquireResult = err; 752 if (reply) reply->setError(err); 753 mLastError = err; 754 } 755 756 return err; 757 } 758 759 status_t IPCThreadState::talkWithDriver(bool doReceive) 760 { 761 ALOG_ASSERT(mProcess->mDriverFD >= 0, "Binder driver is not opened"); 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_LOG_COMMANDS() { 818 alog << "Finished read/write, write size = " << mOut.dataSize() << endl; 819 } 820 } while (err == -EINTR); 821 822 IF_LOG_COMMANDS() { 823 alog << "Our err: " << (void*)err << ", write consumed: " 824 << bwr.write_consumed << " (of " << mOut.dataSize() 825 << "), read consumed: " << bwr.read_consumed << endl; 826 } 827 828 if (err >= NO_ERROR) { 829 if (bwr.write_consumed > 0) { 830 if (bwr.write_consumed < (ssize_t)mOut.dataSize()) 831 mOut.remove(0, bwr.write_consumed); 832 else 833 mOut.setDataSize(0); 834 } 835 if (bwr.read_consumed > 0) { 836 mIn.setDataSize(bwr.read_consumed); 837 mIn.setDataPosition(0); 838 } 839 IF_LOG_COMMANDS() { 840 TextOutput::Bundle _b(alog); 841 alog << "Remaining data size: " << mOut.dataSize() << endl; 842 alog << "Received commands from driver: " << indent; 843 const void* cmds = mIn.data(); 844 const void* end = mIn.data() + mIn.dataSize(); 845 alog << HexDump(cmds, mIn.dataSize()) << endl; 846 while (cmds < end) cmds = printReturnCommand(alog, cmds); 847 alog << dedent; 848 } 849 return NO_ERROR; 850 } 851 852 return err; 853 } 854 855 status_t IPCThreadState::writeTransactionData(int32_t cmd, uint32_t binderFlags, 856 int32_t handle, uint32_t code, const Parcel& data, status_t* statusBuffer) 857 { 858 binder_transaction_data tr; 859 860 tr.target.handle = handle; 861 tr.code = code; 862 tr.flags = binderFlags; 863 tr.cookie = 0; 864 tr.sender_pid = 0; 865 tr.sender_euid = 0; 866 867 const status_t err = data.errorCheck(); 868 if (err == NO_ERROR) { 869 tr.data_size = data.ipcDataSize(); 870 tr.data.ptr.buffer = data.ipcData(); 871 tr.offsets_size = data.ipcObjectsCount()*sizeof(size_t); 872 tr.data.ptr.offsets = data.ipcObjects(); 873 } else if (statusBuffer) { 874 tr.flags |= TF_STATUS_CODE; 875 *statusBuffer = err; 876 tr.data_size = sizeof(status_t); 877 tr.data.ptr.buffer = statusBuffer; 878 tr.offsets_size = 0; 879 tr.data.ptr.offsets = NULL; 880 } else { 881 return (mLastError = err); 882 } 883 884 mOut.writeInt32(cmd); 885 mOut.write(&tr, sizeof(tr)); 886 887 return NO_ERROR; 888 } 889 890 sp<BBinder> the_context_object; 891 892 void setTheContextObject(sp<BBinder> obj) 893 { 894 the_context_object = obj; 895 } 896 897 status_t IPCThreadState::executeCommand(int32_t cmd) 898 { 899 BBinder* obj; 900 RefBase::weakref_type* refs; 901 status_t result = NO_ERROR; 902 903 switch (cmd) { 904 case BR_ERROR: 905 result = mIn.readInt32(); 906 break; 907 908 case BR_OK: 909 break; 910 911 case BR_ACQUIRE: 912 refs = (RefBase::weakref_type*)mIn.readInt32(); 913 obj = (BBinder*)mIn.readInt32(); 914 ALOG_ASSERT(refs->refBase() == obj, 915 "BR_ACQUIRE: object %p does not match cookie %p (expected %p)", 916 refs, obj, refs->refBase()); 917 obj->incStrong(mProcess.get()); 918 IF_LOG_REMOTEREFS() { 919 LOG_REMOTEREFS("BR_ACQUIRE from driver on %p", obj); 920 obj->printRefs(); 921 } 922 mOut.writeInt32(BC_ACQUIRE_DONE); 923 mOut.writeInt32((int32_t)refs); 924 mOut.writeInt32((int32_t)obj); 925 break; 926 927 case BR_RELEASE: 928 refs = (RefBase::weakref_type*)mIn.readInt32(); 929 obj = (BBinder*)mIn.readInt32(); 930 ALOG_ASSERT(refs->refBase() == obj, 931 "BR_RELEASE: object %p does not match cookie %p (expected %p)", 932 refs, obj, refs->refBase()); 933 IF_LOG_REMOTEREFS() { 934 LOG_REMOTEREFS("BR_RELEASE from driver on %p", obj); 935 obj->printRefs(); 936 } 937 mPendingStrongDerefs.push(obj); 938 break; 939 940 case BR_INCREFS: 941 refs = (RefBase::weakref_type*)mIn.readInt32(); 942 obj = (BBinder*)mIn.readInt32(); 943 refs->incWeak(mProcess.get()); 944 mOut.writeInt32(BC_INCREFS_DONE); 945 mOut.writeInt32((int32_t)refs); 946 mOut.writeInt32((int32_t)obj); 947 break; 948 949 case BR_DECREFS: 950 refs = (RefBase::weakref_type*)mIn.readInt32(); 951 obj = (BBinder*)mIn.readInt32(); 952 // NOTE: This assertion is not valid, because the object may no 953 // longer exist (thus the (BBinder*)cast above resulting in a different 954 // memory address). 955 //ALOG_ASSERT(refs->refBase() == obj, 956 // "BR_DECREFS: object %p does not match cookie %p (expected %p)", 957 // refs, obj, refs->refBase()); 958 mPendingWeakDerefs.push(refs); 959 break; 960 961 case BR_ATTEMPT_ACQUIRE: 962 refs = (RefBase::weakref_type*)mIn.readInt32(); 963 obj = (BBinder*)mIn.readInt32(); 964 965 { 966 const bool success = refs->attemptIncStrong(mProcess.get()); 967 ALOG_ASSERT(success && refs->refBase() == obj, 968 "BR_ATTEMPT_ACQUIRE: object %p does not match cookie %p (expected %p)", 969 refs, obj, refs->refBase()); 970 971 mOut.writeInt32(BC_ACQUIRE_RESULT); 972 mOut.writeInt32((int32_t)success); 973 } 974 break; 975 976 case BR_TRANSACTION: 977 { 978 binder_transaction_data tr; 979 result = mIn.read(&tr, sizeof(tr)); 980 ALOG_ASSERT(result == NO_ERROR, 981 "Not enough command data for brTRANSACTION"); 982 if (result != NO_ERROR) break; 983 984 Parcel buffer; 985 buffer.ipcSetDataReference( 986 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 987 tr.data_size, 988 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 989 tr.offsets_size/sizeof(size_t), freeBuffer, this); 990 991 const pid_t origPid = mCallingPid; 992 const uid_t origUid = mCallingUid; 993 994 mCallingPid = tr.sender_pid; 995 mCallingUid = tr.sender_euid; 996 mOrigCallingUid = tr.sender_euid; 997 998 int curPrio = getpriority(PRIO_PROCESS, mMyThreadId); 999 if (gDisableBackgroundScheduling) { 1000 if (curPrio > ANDROID_PRIORITY_NORMAL) { 1001 // We have inherited a reduced priority from the caller, but do not 1002 // want to run in that state in this process. The driver set our 1003 // priority already (though not our scheduling class), so bounce 1004 // it back to the default before invoking the transaction. 1005 setpriority(PRIO_PROCESS, mMyThreadId, ANDROID_PRIORITY_NORMAL); 1006 } 1007 } else { 1008 if (curPrio >= ANDROID_PRIORITY_BACKGROUND) { 1009 // We want to use the inherited priority from the caller. 1010 // Ensure this thread is in the background scheduling class, 1011 // since the driver won't modify scheduling classes for us. 1012 // The scheduling group is reset to default by the caller 1013 // once this method returns after the transaction is complete. 1014 set_sched_policy(mMyThreadId, SP_BACKGROUND); 1015 } 1016 } 1017 1018 //ALOGI(">>>> TRANSACT from pid %d uid %d\n", mCallingPid, mCallingUid); 1019 1020 Parcel reply; 1021 IF_LOG_TRANSACTIONS() { 1022 TextOutput::Bundle _b(alog); 1023 alog << "BR_TRANSACTION thr " << (void*)pthread_self() 1024 << " / obj " << tr.target.ptr << " / code " 1025 << TypeCode(tr.code) << ": " << indent << buffer 1026 << dedent << endl 1027 << "Data addr = " 1028 << reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer) 1029 << ", offsets addr=" 1030 << reinterpret_cast<const size_t*>(tr.data.ptr.offsets) << endl; 1031 } 1032 if (tr.target.ptr) { 1033 sp<BBinder> b((BBinder*)tr.cookie); 1034 const status_t error = b->transact(tr.code, buffer, &reply, tr.flags); 1035 if (error < NO_ERROR) reply.setError(error); 1036 1037 } else { 1038 const status_t error = the_context_object->transact(tr.code, buffer, &reply, tr.flags); 1039 if (error < NO_ERROR) reply.setError(error); 1040 } 1041 1042 //ALOGI("<<<< TRANSACT from pid %d restore pid %d uid %d\n", 1043 // mCallingPid, origPid, origUid); 1044 1045 if ((tr.flags & TF_ONE_WAY) == 0) { 1046 LOG_ONEWAY("Sending reply to %d!", mCallingPid); 1047 sendReply(reply, 0); 1048 } else { 1049 LOG_ONEWAY("NOT sending reply to %d!", mCallingPid); 1050 } 1051 1052 mCallingPid = origPid; 1053 mCallingUid = origUid; 1054 mOrigCallingUid = origUid; 1055 1056 IF_LOG_TRANSACTIONS() { 1057 TextOutput::Bundle _b(alog); 1058 alog << "BC_REPLY thr " << (void*)pthread_self() << " / obj " 1059 << tr.target.ptr << ": " << indent << reply << dedent << endl; 1060 } 1061 1062 } 1063 break; 1064 1065 case BR_DEAD_BINDER: 1066 { 1067 BpBinder *proxy = (BpBinder*)mIn.readInt32(); 1068 proxy->sendObituary(); 1069 mOut.writeInt32(BC_DEAD_BINDER_DONE); 1070 mOut.writeInt32((int32_t)proxy); 1071 } break; 1072 1073 case BR_CLEAR_DEATH_NOTIFICATION_DONE: 1074 { 1075 BpBinder *proxy = (BpBinder*)mIn.readInt32(); 1076 proxy->getWeakRefs()->decWeak(proxy); 1077 } break; 1078 1079 case BR_FINISHED: 1080 result = TIMED_OUT; 1081 break; 1082 1083 case BR_NOOP: 1084 break; 1085 1086 case BR_SPAWN_LOOPER: 1087 mProcess->spawnPooledThread(false); 1088 break; 1089 1090 default: 1091 printf("*** BAD COMMAND %d received from Binder driver\n", cmd); 1092 result = UNKNOWN_ERROR; 1093 break; 1094 } 1095 1096 if (result != NO_ERROR) { 1097 mLastError = result; 1098 } 1099 1100 return result; 1101 } 1102 1103 void IPCThreadState::threadDestructor(void *st) 1104 { 1105 IPCThreadState* const self = static_cast<IPCThreadState*>(st); 1106 if (self) { 1107 self->flushCommands(); 1108 #if defined(HAVE_ANDROID_OS) 1109 ioctl(self->mProcess->mDriverFD, BINDER_THREAD_EXIT, 0); 1110 #endif 1111 delete self; 1112 } 1113 } 1114 1115 1116 void IPCThreadState::freeBuffer(Parcel* parcel, const uint8_t* data, size_t dataSize, 1117 const size_t* objects, size_t objectsSize, 1118 void* cookie) 1119 { 1120 //ALOGI("Freeing parcel %p", &parcel); 1121 IF_LOG_COMMANDS() { 1122 alog << "Writing BC_FREE_BUFFER for " << data << endl; 1123 } 1124 ALOG_ASSERT(data != NULL, "Called with NULL data"); 1125 if (parcel != NULL) parcel->closeFileDescriptors(); 1126 IPCThreadState* state = self(); 1127 state->mOut.writeInt32(BC_FREE_BUFFER); 1128 state->mOut.writeInt32((int32_t)data); 1129 } 1130 1131 }; // namespace android 1132
