IPCThreadState.cpp revision 440fd870b20b4720e11c9ea71d2a3284f8cf2f59
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 70namespace android { 71 72static const char* getReturnString(size_t idx); 73static const char* getCommandString(size_t idx); 74static const void* printReturnCommand(TextOutput& out, const void* _cmd); 75static 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 80static const char *kReturnStrings[] = { 81#if 1 /* TODO: error update strings */ 82 "unknown", 83#else 84 "BR_OK", 85 "BR_TIMEOUT", 86 "BR_WAKEUP", 87 "BR_TRANSACTION", 88 "BR_REPLY", 89 "BR_ACQUIRE_RESULT", 90 "BR_DEAD_REPLY", 91 "BR_TRANSACTION_COMPLETE", 92 "BR_INCREFS", 93 "BR_ACQUIRE", 94 "BR_RELEASE", 95 "BR_DECREFS", 96 "BR_ATTEMPT_ACQUIRE", 97 "BR_EVENT_OCCURRED", 98 "BR_NOOP", 99 "BR_SPAWN_LOOPER", 100 "BR_FINISHED", 101 "BR_DEAD_BINDER", 102 "BR_CLEAR_DEATH_NOTIFICATION_DONE" 103#endif 104}; 105 106static const char *kCommandStrings[] = { 107#if 1 /* TODO: error update strings */ 108 "unknown", 109#else 110 "BC_NOOP", 111 "BC_TRANSACTION", 112 "BC_REPLY", 113 "BC_ACQUIRE_RESULT", 114 "BC_FREE_BUFFER", 115 "BC_TRANSACTION_COMPLETE", 116 "BC_INCREFS", 117 "BC_ACQUIRE", 118 "BC_RELEASE", 119 "BC_DECREFS", 120 "BC_INCREFS_DONE", 121 "BC_ACQUIRE_DONE", 122 "BC_ATTEMPT_ACQUIRE", 123 "BC_RETRIEVE_ROOT_OBJECT", 124 "BC_SET_THREAD_ENTRY", 125 "BC_REGISTER_LOOPER", 126 "BC_ENTER_LOOPER", 127 "BC_EXIT_LOOPER", 128 "BC_SYNC", 129 "BC_STOP_PROCESS", 130 "BC_STOP_SELF", 131 "BC_REQUEST_DEATH_NOTIFICATION", 132 "BC_CLEAR_DEATH_NOTIFICATION", 133 "BC_DEAD_BINDER_DONE" 134#endif 135}; 136 137static const char* getReturnString(size_t idx) 138{ 139 if (idx < sizeof(kReturnStrings) / sizeof(kReturnStrings[0])) 140 return kReturnStrings[idx]; 141 else 142 return "unknown"; 143} 144 145static const char* getCommandString(size_t idx) 146{ 147 if (idx < sizeof(kCommandStrings) / sizeof(kCommandStrings[0])) 148 return kCommandStrings[idx]; 149 else 150 return "unknown"; 151} 152 153static const void* printBinderTransactionData(TextOutput& out, const void* data) 154{ 155 const binder_transaction_data* btd = 156 (const binder_transaction_data*)data; 157 out << "target=" << btd->target.ptr << " (cookie " << btd->cookie << ")" << endl 158 << "code=" << TypeCode(btd->code) << ", flags=" << (void*)btd->flags << endl 159 << "data=" << btd->data.ptr.buffer << " (" << (void*)btd->data_size 160 << " bytes)" << endl 161 << "offsets=" << btd->data.ptr.offsets << " (" << (void*)btd->offsets_size 162 << " bytes)" << endl; 163 return btd+1; 164} 165 166static const void* printReturnCommand(TextOutput& out, const void* _cmd) 167{ 168 static const int32_t N = sizeof(kReturnStrings)/sizeof(kReturnStrings[0]); 169 170 const int32_t* cmd = (const int32_t*)_cmd; 171 int32_t code = *cmd++; 172 if (code == BR_ERROR) { 173 out << "BR_ERROR: " << (void*)(*cmd++) << endl; 174 return cmd; 175 } else if (code < 0 || code >= N) { 176 out << "Unknown reply: " << code << endl; 177 return cmd; 178 } 179 180 out << kReturnStrings[code]; 181 switch (code) { 182 case BR_TRANSACTION: 183 case BR_REPLY: { 184 out << ": " << indent; 185 cmd = (const int32_t *)printBinderTransactionData(out, cmd); 186 out << dedent; 187 } break; 188 189 case BR_ACQUIRE_RESULT: { 190 const int32_t res = *cmd++; 191 out << ": " << res << (res ? " (SUCCESS)" : " (FAILURE)"); 192 } break; 193 194 case BR_INCREFS: 195 case BR_ACQUIRE: 196 case BR_RELEASE: 197 case BR_DECREFS: { 198 const int32_t b = *cmd++; 199 const int32_t c = *cmd++; 200 out << ": target=" << (void*)b << " (cookie " << (void*)c << ")"; 201 } break; 202 203 case BR_ATTEMPT_ACQUIRE: { 204 const int32_t p = *cmd++; 205 const int32_t b = *cmd++; 206 const int32_t c = *cmd++; 207 out << ": target=" << (void*)b << " (cookie " << (void*)c 208 << "), pri=" << p; 209 } break; 210 211 case BR_DEAD_BINDER: 212 case BR_CLEAR_DEATH_NOTIFICATION_DONE: { 213 const int32_t c = *cmd++; 214 out << ": death cookie " << (void*)c; 215 } break; 216 } 217 218 out << endl; 219 return cmd; 220} 221 222static const void* printCommand(TextOutput& out, const void* _cmd) 223{ 224 static const int32_t N = sizeof(kCommandStrings)/sizeof(kCommandStrings[0]); 225 226 const int32_t* cmd = (const int32_t*)_cmd; 227 int32_t code = *cmd++; 228 if (code < 0 || code >= N) { 229 out << "Unknown command: " << code << endl; 230 return cmd; 231 } 232 233 out << kCommandStrings[code]; 234 switch (code) { 235 case BC_TRANSACTION: 236 case BC_REPLY: { 237 out << ": " << indent; 238 cmd = (const int32_t *)printBinderTransactionData(out, cmd); 239 out << dedent; 240 } break; 241 242 case BC_ACQUIRE_RESULT: { 243 const int32_t res = *cmd++; 244 out << ": " << res << (res ? " (SUCCESS)" : " (FAILURE)"); 245 } break; 246 247 case BC_FREE_BUFFER: { 248 const int32_t buf = *cmd++; 249 out << ": buffer=" << (void*)buf; 250 } break; 251 252 case BC_INCREFS: 253 case BC_ACQUIRE: 254 case BC_RELEASE: 255 case BC_DECREFS: { 256 const int32_t d = *cmd++; 257 out << ": descriptor=" << (void*)d; 258 } break; 259 260 case BC_INCREFS_DONE: 261 case BC_ACQUIRE_DONE: { 262 const int32_t b = *cmd++; 263 const int32_t c = *cmd++; 264 out << ": target=" << (void*)b << " (cookie " << (void*)c << ")"; 265 } break; 266 267 case BC_ATTEMPT_ACQUIRE: { 268 const int32_t p = *cmd++; 269 const int32_t d = *cmd++; 270 out << ": decriptor=" << (void*)d << ", pri=" << p; 271 } break; 272 273 case BC_REQUEST_DEATH_NOTIFICATION: 274 case BC_CLEAR_DEATH_NOTIFICATION: { 275 const int32_t h = *cmd++; 276 const int32_t c = *cmd++; 277 out << ": handle=" << h << " (death cookie " << (void*)c << ")"; 278 } break; 279 280 case BC_DEAD_BINDER_DONE: { 281 const int32_t c = *cmd++; 282 out << ": death cookie " << (void*)c; 283 } break; 284 } 285 286 out << endl; 287 return cmd; 288} 289#endif 290 291static pthread_mutex_t gTLSMutex = PTHREAD_MUTEX_INITIALIZER; 292static bool gHaveTLS = false; 293static pthread_key_t gTLS = 0; 294static bool gShutdown = false; 295static bool gDisableBackgroundScheduling = false; 296 297IPCThreadState* IPCThreadState::self() 298{ 299 if (gHaveTLS) { 300restart: 301 const pthread_key_t k = gTLS; 302 IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k); 303 if (st) return st; 304 return new IPCThreadState; 305 } 306 307 if (gShutdown) return NULL; 308 309 pthread_mutex_lock(&gTLSMutex); 310 if (!gHaveTLS) { 311 if (pthread_key_create(&gTLS, threadDestructor) != 0) { 312 pthread_mutex_unlock(&gTLSMutex); 313 return NULL; 314 } 315 gHaveTLS = true; 316 } 317 pthread_mutex_unlock(&gTLSMutex); 318 goto restart; 319} 320 321void IPCThreadState::shutdown() 322{ 323 gShutdown = true; 324 325 if (gHaveTLS) { 326 // XXX Need to wait for all thread pool threads to exit! 327 IPCThreadState* st = (IPCThreadState*)pthread_getspecific(gTLS); 328 if (st) { 329 delete st; 330 pthread_setspecific(gTLS, NULL); 331 } 332 gHaveTLS = false; 333 } 334} 335 336void IPCThreadState::disableBackgroundScheduling(bool disable) 337{ 338 gDisableBackgroundScheduling = disable; 339} 340 341sp<ProcessState> IPCThreadState::process() 342{ 343 return mProcess; 344} 345 346status_t IPCThreadState::clearLastError() 347{ 348 const status_t err = mLastError; 349 mLastError = NO_ERROR; 350 return err; 351} 352 353int IPCThreadState::getCallingPid() 354{ 355 return mCallingPid; 356} 357 358int IPCThreadState::getCallingUid() 359{ 360 return mCallingUid; 361} 362 363int64_t IPCThreadState::clearCallingIdentity() 364{ 365 int64_t token = ((int64_t)mCallingUid<<32) | mCallingPid; 366 clearCaller(); 367 return token; 368} 369 370void IPCThreadState::restoreCallingIdentity(int64_t token) 371{ 372 mCallingUid = (int)(token>>32); 373 mCallingPid = (int)token; 374} 375 376void IPCThreadState::clearCaller() 377{ 378 mCallingPid = getpid(); 379 mCallingUid = getuid(); 380} 381 382void IPCThreadState::flushCommands() 383{ 384 if (mProcess->mDriverFD <= 0) 385 return; 386 talkWithDriver(false); 387} 388 389void IPCThreadState::joinThreadPool(bool isMain) 390{ 391 LOG_THREADPOOL("**** THREAD %p (PID %d) IS JOINING THE THREAD POOL\n", (void*)pthread_self(), getpid()); 392 393 mOut.writeInt32(isMain ? BC_ENTER_LOOPER : BC_REGISTER_LOOPER); 394 395 // This thread may have been spawned by a thread that was in the background 396 // scheduling group, so first we will make sure it is in the default/foreground 397 // one to avoid performing an initial transaction in the background. 398 androidSetThreadSchedulingGroup(mMyThreadId, ANDROID_TGROUP_DEFAULT); 399 400 status_t result; 401 do { 402 int32_t cmd; 403 404 // When we've cleared the incoming command queue, process any pending derefs 405 if (mIn.dataPosition() >= mIn.dataSize()) { 406 size_t numPending = mPendingWeakDerefs.size(); 407 if (numPending > 0) { 408 for (size_t i = 0; i < numPending; i++) { 409 RefBase::weakref_type* refs = mPendingWeakDerefs[i]; 410 refs->decWeak(mProcess.get()); 411 } 412 mPendingWeakDerefs.clear(); 413 } 414 415 numPending = mPendingStrongDerefs.size(); 416 if (numPending > 0) { 417 for (size_t i = 0; i < numPending; i++) { 418 BBinder* obj = mPendingStrongDerefs[i]; 419 obj->decStrong(mProcess.get()); 420 } 421 mPendingStrongDerefs.clear(); 422 } 423 } 424 425 // now get the next command to be processed, waiting if necessary 426 result = talkWithDriver(); 427 if (result >= NO_ERROR) { 428 size_t IN = mIn.dataAvail(); 429 if (IN < sizeof(int32_t)) continue; 430 cmd = mIn.readInt32(); 431 IF_LOG_COMMANDS() { 432 alog << "Processing top-level Command: " 433 << getReturnString(cmd) << endl; 434 } 435 436 437 result = executeCommand(cmd); 438 } 439 440 // After executing the command, ensure that the thread is returned to the 441 // default cgroup before rejoining the pool. The driver takes care of 442 // restoring the priority, but doesn't do anything with cgroups so we 443 // need to take care of that here in userspace. Note that we do make 444 // sure to go in the foreground after executing a transaction, but 445 // there are other callbacks into user code that could have changed 446 // our group so we want to make absolutely sure it is put back. 447 androidSetThreadSchedulingGroup(mMyThreadId, ANDROID_TGROUP_DEFAULT); 448 449 // Let this thread exit the thread pool if it is no longer 450 // needed and it is not the main process thread. 451 if(result == TIMED_OUT && !isMain) { 452 break; 453 } 454 } while (result != -ECONNREFUSED && result != -EBADF); 455 456 LOG_THREADPOOL("**** THREAD %p (PID %d) IS LEAVING THE THREAD POOL err=%p\n", 457 (void*)pthread_self(), getpid(), (void*)result); 458 459 mOut.writeInt32(BC_EXIT_LOOPER); 460 talkWithDriver(false); 461} 462 463void IPCThreadState::stopProcess(bool immediate) 464{ 465 //LOGI("**** STOPPING PROCESS"); 466 flushCommands(); 467 int fd = mProcess->mDriverFD; 468 mProcess->mDriverFD = -1; 469 close(fd); 470 //kill(getpid(), SIGKILL); 471} 472 473status_t IPCThreadState::transact(int32_t handle, 474 uint32_t code, const Parcel& data, 475 Parcel* reply, uint32_t flags) 476{ 477 status_t err = data.errorCheck(); 478 479 flags |= TF_ACCEPT_FDS; 480 481 IF_LOG_TRANSACTIONS() { 482 TextOutput::Bundle _b(alog); 483 alog << "BC_TRANSACTION thr " << (void*)pthread_self() << " / hand " 484 << handle << " / code " << TypeCode(code) << ": " 485 << indent << data << dedent << endl; 486 } 487 488 if (err == NO_ERROR) { 489 LOG_ONEWAY(">>>> SEND from pid %d uid %d %s", getpid(), getuid(), 490 (flags & TF_ONE_WAY) == 0 ? "READ REPLY" : "ONE WAY"); 491 err = writeTransactionData(BC_TRANSACTION, flags, handle, code, data, NULL); 492 } 493 494 if (err != NO_ERROR) { 495 if (reply) reply->setError(err); 496 return (mLastError = err); 497 } 498 499 if ((flags & TF_ONE_WAY) == 0) { 500 if (reply) { 501 err = waitForResponse(reply); 502 } else { 503 Parcel fakeReply; 504 err = waitForResponse(&fakeReply); 505 } 506 507 IF_LOG_TRANSACTIONS() { 508 TextOutput::Bundle _b(alog); 509 alog << "BR_REPLY thr " << (void*)pthread_self() << " / hand " 510 << handle << ": "; 511 if (reply) alog << indent << *reply << dedent << endl; 512 else alog << "(none requested)" << endl; 513 } 514 } else { 515 err = waitForResponse(NULL, NULL); 516 } 517 518 return err; 519} 520 521void IPCThreadState::incStrongHandle(int32_t handle) 522{ 523 LOG_REMOTEREFS("IPCThreadState::incStrongHandle(%d)\n", handle); 524 mOut.writeInt32(BC_ACQUIRE); 525 mOut.writeInt32(handle); 526} 527 528void IPCThreadState::decStrongHandle(int32_t handle) 529{ 530 LOG_REMOTEREFS("IPCThreadState::decStrongHandle(%d)\n", handle); 531 mOut.writeInt32(BC_RELEASE); 532 mOut.writeInt32(handle); 533} 534 535void IPCThreadState::incWeakHandle(int32_t handle) 536{ 537 LOG_REMOTEREFS("IPCThreadState::incWeakHandle(%d)\n", handle); 538 mOut.writeInt32(BC_INCREFS); 539 mOut.writeInt32(handle); 540} 541 542void IPCThreadState::decWeakHandle(int32_t handle) 543{ 544 LOG_REMOTEREFS("IPCThreadState::decWeakHandle(%d)\n", handle); 545 mOut.writeInt32(BC_DECREFS); 546 mOut.writeInt32(handle); 547} 548 549status_t IPCThreadState::attemptIncStrongHandle(int32_t handle) 550{ 551 mOut.writeInt32(BC_ATTEMPT_ACQUIRE); 552 mOut.writeInt32(0); // xxx was thread priority 553 mOut.writeInt32(handle); 554 status_t result = UNKNOWN_ERROR; 555 556 waitForResponse(NULL, &result); 557 558#if LOG_REFCOUNTS 559 printf("IPCThreadState::attemptIncStrongHandle(%ld) = %s\n", 560 handle, result == NO_ERROR ? "SUCCESS" : "FAILURE"); 561#endif 562 563 return result; 564} 565 566void IPCThreadState::expungeHandle(int32_t handle, IBinder* binder) 567{ 568#if LOG_REFCOUNTS 569 printf("IPCThreadState::expungeHandle(%ld)\n", handle); 570#endif 571 self()->mProcess->expungeHandle(handle, binder); 572} 573 574status_t IPCThreadState::requestDeathNotification(int32_t handle, BpBinder* proxy) 575{ 576 mOut.writeInt32(BC_REQUEST_DEATH_NOTIFICATION); 577 mOut.writeInt32((int32_t)handle); 578 mOut.writeInt32((int32_t)proxy); 579 return NO_ERROR; 580} 581 582status_t IPCThreadState::clearDeathNotification(int32_t handle, BpBinder* proxy) 583{ 584 mOut.writeInt32(BC_CLEAR_DEATH_NOTIFICATION); 585 mOut.writeInt32((int32_t)handle); 586 mOut.writeInt32((int32_t)proxy); 587 return NO_ERROR; 588} 589 590IPCThreadState::IPCThreadState() 591 : mProcess(ProcessState::self()), mMyThreadId(androidGetTid()) 592{ 593 pthread_setspecific(gTLS, this); 594 clearCaller(); 595 mIn.setDataCapacity(256); 596 mOut.setDataCapacity(256); 597} 598 599IPCThreadState::~IPCThreadState() 600{ 601} 602 603status_t IPCThreadState::sendReply(const Parcel& reply, uint32_t flags) 604{ 605 status_t err; 606 status_t statusBuffer; 607 err = writeTransactionData(BC_REPLY, flags, -1, 0, reply, &statusBuffer); 608 if (err < NO_ERROR) return err; 609 610 return waitForResponse(NULL, NULL); 611} 612 613status_t IPCThreadState::waitForResponse(Parcel *reply, status_t *acquireResult) 614{ 615 int32_t cmd; 616 int32_t err; 617 618 while (1) { 619 if ((err=talkWithDriver()) < NO_ERROR) break; 620 err = mIn.errorCheck(); 621 if (err < NO_ERROR) break; 622 if (mIn.dataAvail() == 0) continue; 623 624 cmd = mIn.readInt32(); 625 626 IF_LOG_COMMANDS() { 627 alog << "Processing waitForResponse Command: " 628 << getReturnString(cmd) << endl; 629 } 630 631 switch (cmd) { 632 case BR_TRANSACTION_COMPLETE: 633 if (!reply && !acquireResult) goto finish; 634 break; 635 636 case BR_DEAD_REPLY: 637 err = DEAD_OBJECT; 638 goto finish; 639 640 case BR_FAILED_REPLY: 641 err = FAILED_TRANSACTION; 642 goto finish; 643 644 case BR_ACQUIRE_RESULT: 645 { 646 LOG_ASSERT(acquireResult != NULL, "Unexpected brACQUIRE_RESULT"); 647 const int32_t result = mIn.readInt32(); 648 if (!acquireResult) continue; 649 *acquireResult = result ? NO_ERROR : INVALID_OPERATION; 650 } 651 goto finish; 652 653 case BR_REPLY: 654 { 655 binder_transaction_data tr; 656 err = mIn.read(&tr, sizeof(tr)); 657 LOG_ASSERT(err == NO_ERROR, "Not enough command data for brREPLY"); 658 if (err != NO_ERROR) goto finish; 659 660 if (reply) { 661 if ((tr.flags & TF_STATUS_CODE) == 0) { 662 reply->ipcSetDataReference( 663 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 664 tr.data_size, 665 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 666 tr.offsets_size/sizeof(size_t), 667 freeBuffer, this); 668 } else { 669 err = *static_cast<const status_t*>(tr.data.ptr.buffer); 670 freeBuffer(NULL, 671 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 672 tr.data_size, 673 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 674 tr.offsets_size/sizeof(size_t), this); 675 } 676 } else { 677 freeBuffer(NULL, 678 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 679 tr.data_size, 680 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 681 tr.offsets_size/sizeof(size_t), this); 682 continue; 683 } 684 } 685 goto finish; 686 687 default: 688 err = executeCommand(cmd); 689 if (err != NO_ERROR) goto finish; 690 break; 691 } 692 } 693 694finish: 695 if (err != NO_ERROR) { 696 if (acquireResult) *acquireResult = err; 697 if (reply) reply->setError(err); 698 mLastError = err; 699 } 700 701 return err; 702} 703 704status_t IPCThreadState::talkWithDriver(bool doReceive) 705{ 706 LOG_ASSERT(mProcess->mDriverFD >= 0, "Binder driver is not opened"); 707 708 binder_write_read bwr; 709 710 // Is the read buffer empty? 711 const bool needRead = mIn.dataPosition() >= mIn.dataSize(); 712 713 // We don't want to write anything if we are still reading 714 // from data left in the input buffer and the caller 715 // has requested to read the next data. 716 const size_t outAvail = (!doReceive || needRead) ? mOut.dataSize() : 0; 717 718 bwr.write_size = outAvail; 719 bwr.write_buffer = (long unsigned int)mOut.data(); 720 721 // This is what we'll read. 722 if (doReceive && needRead) { 723 bwr.read_size = mIn.dataCapacity(); 724 bwr.read_buffer = (long unsigned int)mIn.data(); 725 } else { 726 bwr.read_size = 0; 727 } 728 729 IF_LOG_COMMANDS() { 730 TextOutput::Bundle _b(alog); 731 if (outAvail != 0) { 732 alog << "Sending commands to driver: " << indent; 733 const void* cmds = (const void*)bwr.write_buffer; 734 const void* end = ((const uint8_t*)cmds)+bwr.write_size; 735 alog << HexDump(cmds, bwr.write_size) << endl; 736 while (cmds < end) cmds = printCommand(alog, cmds); 737 alog << dedent; 738 } 739 alog << "Size of receive buffer: " << bwr.read_size 740 << ", needRead: " << needRead << ", doReceive: " << doReceive << endl; 741 } 742 743 // Return immediately if there is nothing to do. 744 if ((bwr.write_size == 0) && (bwr.read_size == 0)) return NO_ERROR; 745 746 bwr.write_consumed = 0; 747 bwr.read_consumed = 0; 748 status_t err; 749 do { 750 IF_LOG_COMMANDS() { 751 alog << "About to read/write, write size = " << mOut.dataSize() << endl; 752 } 753#if defined(HAVE_ANDROID_OS) 754 if (ioctl(mProcess->mDriverFD, BINDER_WRITE_READ, &bwr) >= 0) 755 err = NO_ERROR; 756 else 757 err = -errno; 758#else 759 err = INVALID_OPERATION; 760#endif 761 IF_LOG_COMMANDS() { 762 alog << "Finished read/write, write size = " << mOut.dataSize() << endl; 763 } 764 } while (err == -EINTR); 765 766 IF_LOG_COMMANDS() { 767 alog << "Our err: " << (void*)err << ", write consumed: " 768 << bwr.write_consumed << " (of " << mOut.dataSize() 769 << "), read consumed: " << bwr.read_consumed << endl; 770 } 771 772 if (err >= NO_ERROR) { 773 if (bwr.write_consumed > 0) { 774 if (bwr.write_consumed < (ssize_t)mOut.dataSize()) 775 mOut.remove(0, bwr.write_consumed); 776 else 777 mOut.setDataSize(0); 778 } 779 if (bwr.read_consumed > 0) { 780 mIn.setDataSize(bwr.read_consumed); 781 mIn.setDataPosition(0); 782 } 783 IF_LOG_COMMANDS() { 784 TextOutput::Bundle _b(alog); 785 alog << "Remaining data size: " << mOut.dataSize() << endl; 786 alog << "Received commands from driver: " << indent; 787 const void* cmds = mIn.data(); 788 const void* end = mIn.data() + mIn.dataSize(); 789 alog << HexDump(cmds, mIn.dataSize()) << endl; 790 while (cmds < end) cmds = printReturnCommand(alog, cmds); 791 alog << dedent; 792 } 793 return NO_ERROR; 794 } 795 796 return err; 797} 798 799status_t IPCThreadState::writeTransactionData(int32_t cmd, uint32_t binderFlags, 800 int32_t handle, uint32_t code, const Parcel& data, status_t* statusBuffer) 801{ 802 binder_transaction_data tr; 803 804 tr.target.handle = handle; 805 tr.code = code; 806 tr.flags = binderFlags; 807 808 const status_t err = data.errorCheck(); 809 if (err == NO_ERROR) { 810 tr.data_size = data.ipcDataSize(); 811 tr.data.ptr.buffer = data.ipcData(); 812 tr.offsets_size = data.ipcObjectsCount()*sizeof(size_t); 813 tr.data.ptr.offsets = data.ipcObjects(); 814 } else if (statusBuffer) { 815 tr.flags |= TF_STATUS_CODE; 816 *statusBuffer = err; 817 tr.data_size = sizeof(status_t); 818 tr.data.ptr.buffer = statusBuffer; 819 tr.offsets_size = 0; 820 tr.data.ptr.offsets = NULL; 821 } else { 822 return (mLastError = err); 823 } 824 825 mOut.writeInt32(cmd); 826 mOut.write(&tr, sizeof(tr)); 827 828 return NO_ERROR; 829} 830 831sp<BBinder> the_context_object; 832 833void setTheContextObject(sp<BBinder> obj) 834{ 835 the_context_object = obj; 836} 837 838status_t IPCThreadState::executeCommand(int32_t cmd) 839{ 840 BBinder* obj; 841 RefBase::weakref_type* refs; 842 status_t result = NO_ERROR; 843 844 switch (cmd) { 845 case BR_ERROR: 846 result = mIn.readInt32(); 847 break; 848 849 case BR_OK: 850 break; 851 852 case BR_ACQUIRE: 853 refs = (RefBase::weakref_type*)mIn.readInt32(); 854 obj = (BBinder*)mIn.readInt32(); 855 LOG_ASSERT(refs->refBase() == obj, 856 "BR_ACQUIRE: object %p does not match cookie %p (expected %p)", 857 refs, obj, refs->refBase()); 858 obj->incStrong(mProcess.get()); 859 IF_LOG_REMOTEREFS() { 860 LOG_REMOTEREFS("BR_ACQUIRE from driver on %p", obj); 861 obj->printRefs(); 862 } 863 mOut.writeInt32(BC_ACQUIRE_DONE); 864 mOut.writeInt32((int32_t)refs); 865 mOut.writeInt32((int32_t)obj); 866 break; 867 868 case BR_RELEASE: 869 refs = (RefBase::weakref_type*)mIn.readInt32(); 870 obj = (BBinder*)mIn.readInt32(); 871 LOG_ASSERT(refs->refBase() == obj, 872 "BR_RELEASE: object %p does not match cookie %p (expected %p)", 873 refs, obj, refs->refBase()); 874 IF_LOG_REMOTEREFS() { 875 LOG_REMOTEREFS("BR_RELEASE from driver on %p", obj); 876 obj->printRefs(); 877 } 878 mPendingStrongDerefs.push(obj); 879 break; 880 881 case BR_INCREFS: 882 refs = (RefBase::weakref_type*)mIn.readInt32(); 883 obj = (BBinder*)mIn.readInt32(); 884 refs->incWeak(mProcess.get()); 885 mOut.writeInt32(BC_INCREFS_DONE); 886 mOut.writeInt32((int32_t)refs); 887 mOut.writeInt32((int32_t)obj); 888 break; 889 890 case BR_DECREFS: 891 refs = (RefBase::weakref_type*)mIn.readInt32(); 892 obj = (BBinder*)mIn.readInt32(); 893 // NOTE: This assertion is not valid, because the object may no 894 // longer exist (thus the (BBinder*)cast above resulting in a different 895 // memory address). 896 //LOG_ASSERT(refs->refBase() == obj, 897 // "BR_DECREFS: object %p does not match cookie %p (expected %p)", 898 // refs, obj, refs->refBase()); 899 mPendingWeakDerefs.push(refs); 900 break; 901 902 case BR_ATTEMPT_ACQUIRE: 903 refs = (RefBase::weakref_type*)mIn.readInt32(); 904 obj = (BBinder*)mIn.readInt32(); 905 906 { 907 const bool success = refs->attemptIncStrong(mProcess.get()); 908 LOG_ASSERT(success && refs->refBase() == obj, 909 "BR_ATTEMPT_ACQUIRE: object %p does not match cookie %p (expected %p)", 910 refs, obj, refs->refBase()); 911 912 mOut.writeInt32(BC_ACQUIRE_RESULT); 913 mOut.writeInt32((int32_t)success); 914 } 915 break; 916 917 case BR_TRANSACTION: 918 { 919 binder_transaction_data tr; 920 result = mIn.read(&tr, sizeof(tr)); 921 LOG_ASSERT(result == NO_ERROR, 922 "Not enough command data for brTRANSACTION"); 923 if (result != NO_ERROR) break; 924 925 Parcel buffer; 926 buffer.ipcSetDataReference( 927 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 928 tr.data_size, 929 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 930 tr.offsets_size/sizeof(size_t), freeBuffer, this); 931 932 const pid_t origPid = mCallingPid; 933 const uid_t origUid = mCallingUid; 934 935 mCallingPid = tr.sender_pid; 936 mCallingUid = tr.sender_euid; 937 938 int curPrio = getpriority(PRIO_PROCESS, mMyThreadId); 939 if (gDisableBackgroundScheduling) { 940 if (curPrio > ANDROID_PRIORITY_NORMAL) { 941 // We have inherited a reduced priority from the caller, but do not 942 // want to run in that state in this process. The driver set our 943 // priority already (though not our scheduling class), so bounce 944 // it back to the default before invoking the transaction. 945 setpriority(PRIO_PROCESS, mMyThreadId, ANDROID_PRIORITY_NORMAL); 946 } 947 } else { 948 if (curPrio >= ANDROID_PRIORITY_BACKGROUND) { 949 // We want to use the inherited priority from the caller. 950 // Ensure this thread is in the background scheduling class, 951 // since the driver won't modify scheduling classes for us. 952 // The scheduling group is reset to default by the caller 953 // once this method returns after the transaction is complete. 954 androidSetThreadSchedulingGroup(mMyThreadId, 955 ANDROID_TGROUP_BG_NONINTERACT); 956 } 957 } 958 959 //LOGI(">>>> TRANSACT from pid %d uid %d\n", mCallingPid, mCallingUid); 960 961 Parcel reply; 962 IF_LOG_TRANSACTIONS() { 963 TextOutput::Bundle _b(alog); 964 alog << "BR_TRANSACTION thr " << (void*)pthread_self() 965 << " / obj " << tr.target.ptr << " / code " 966 << TypeCode(tr.code) << ": " << indent << buffer 967 << dedent << endl 968 << "Data addr = " 969 << reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer) 970 << ", offsets addr=" 971 << reinterpret_cast<const size_t*>(tr.data.ptr.offsets) << endl; 972 } 973 if (tr.target.ptr) { 974 sp<BBinder> b((BBinder*)tr.cookie); 975 const status_t error = b->transact(tr.code, buffer, &reply, 0); 976 if (error < NO_ERROR) reply.setError(error); 977 978 } else { 979 const status_t error = the_context_object->transact(tr.code, buffer, &reply, 0); 980 if (error < NO_ERROR) reply.setError(error); 981 } 982 983 //LOGI("<<<< TRANSACT from pid %d restore pid %d uid %d\n", 984 // mCallingPid, origPid, origUid); 985 986 if ((tr.flags & TF_ONE_WAY) == 0) { 987 LOG_ONEWAY("Sending reply to %d!", mCallingPid); 988 sendReply(reply, 0); 989 } else { 990 LOG_ONEWAY("NOT sending reply to %d!", mCallingPid); 991 } 992 993 mCallingPid = origPid; 994 mCallingUid = origUid; 995 996 IF_LOG_TRANSACTIONS() { 997 TextOutput::Bundle _b(alog); 998 alog << "BC_REPLY thr " << (void*)pthread_self() << " / obj " 999 << tr.target.ptr << ": " << indent << reply << dedent << endl; 1000 } 1001 1002 } 1003 break; 1004 1005 case BR_DEAD_BINDER: 1006 { 1007 BpBinder *proxy = (BpBinder*)mIn.readInt32(); 1008 proxy->sendObituary(); 1009 mOut.writeInt32(BC_DEAD_BINDER_DONE); 1010 mOut.writeInt32((int32_t)proxy); 1011 } break; 1012 1013 case BR_CLEAR_DEATH_NOTIFICATION_DONE: 1014 { 1015 BpBinder *proxy = (BpBinder*)mIn.readInt32(); 1016 proxy->getWeakRefs()->decWeak(proxy); 1017 } break; 1018 1019 case BR_FINISHED: 1020 result = TIMED_OUT; 1021 break; 1022 1023 case BR_NOOP: 1024 break; 1025 1026 case BR_SPAWN_LOOPER: 1027 mProcess->spawnPooledThread(false); 1028 break; 1029 1030 default: 1031 printf("*** BAD COMMAND %d received from Binder driver\n", cmd); 1032 result = UNKNOWN_ERROR; 1033 break; 1034 } 1035 1036 if (result != NO_ERROR) { 1037 mLastError = result; 1038 } 1039 1040 return result; 1041} 1042 1043void IPCThreadState::threadDestructor(void *st) 1044{ 1045 IPCThreadState* const self = static_cast<IPCThreadState*>(st); 1046 if (self) { 1047 self->flushCommands(); 1048#if defined(HAVE_ANDROID_OS) 1049 ioctl(self->mProcess->mDriverFD, BINDER_THREAD_EXIT, 0); 1050#endif 1051 delete self; 1052 } 1053} 1054 1055 1056void IPCThreadState::freeBuffer(Parcel* parcel, const uint8_t* data, size_t dataSize, 1057 const size_t* objects, size_t objectsSize, 1058 void* cookie) 1059{ 1060 //LOGI("Freeing parcel %p", &parcel); 1061 IF_LOG_COMMANDS() { 1062 alog << "Writing BC_FREE_BUFFER for " << data << endl; 1063 } 1064 LOG_ASSERT(data != NULL, "Called with NULL data"); 1065 if (parcel != NULL) parcel->closeFileDescriptors(); 1066 IPCThreadState* state = self(); 1067 state->mOut.writeInt32(BC_FREE_BUFFER); 1068 state->mOut.writeInt32((int32_t)data); 1069} 1070 1071}; // namespace android 1072