IPCThreadState.cpp revision 0845d0245e09548110cacb0f20e9934753388aab
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 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 "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 101static 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 121static 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 129static 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 137static 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 156static 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 217static 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 292static pthread_mutex_t gTLSMutex = PTHREAD_MUTEX_INITIALIZER; 293static bool gHaveTLS = false; 294static pthread_key_t gTLS = 0; 295static bool gShutdown = false; 296static bool gDisableBackgroundScheduling = false; 297 298IPCThreadState* IPCThreadState::self() 299{ 300 if (gHaveTLS) { 301restart: 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 322IPCThreadState* 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 332void 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 347void IPCThreadState::disableBackgroundScheduling(bool disable) 348{ 349 gDisableBackgroundScheduling = disable; 350} 351 352sp<ProcessState> IPCThreadState::process() 353{ 354 return mProcess; 355} 356 357status_t IPCThreadState::clearLastError() 358{ 359 const status_t err = mLastError; 360 mLastError = NO_ERROR; 361 return err; 362} 363 364int IPCThreadState::getCallingPid() 365{ 366 return mCallingPid; 367} 368 369int IPCThreadState::getCallingUid() 370{ 371 return mCallingUid; 372} 373 374int64_t IPCThreadState::clearCallingIdentity() 375{ 376 int64_t token = ((int64_t)mCallingUid<<32) | mCallingPid; 377 clearCaller(); 378 return token; 379} 380 381void IPCThreadState::setStrictModePolicy(int32_t policy) 382{ 383 mStrictModePolicy = policy; 384} 385 386int32_t IPCThreadState::getStrictModePolicy() const 387{ 388 return mStrictModePolicy; 389} 390 391void IPCThreadState::setLastTransactionBinderFlags(int32_t flags) 392{ 393 mLastTransactionBinderFlags = flags; 394} 395 396int32_t IPCThreadState::getLastTransactionBinderFlags() const 397{ 398 return mLastTransactionBinderFlags; 399} 400 401void IPCThreadState::restoreCallingIdentity(int64_t token) 402{ 403 mCallingUid = (int)(token>>32); 404 mCallingPid = (int)token; 405} 406 407void IPCThreadState::clearCaller() 408{ 409 mCallingPid = getpid(); 410 mCallingUid = getuid(); 411} 412 413void IPCThreadState::flushCommands() 414{ 415 if (mProcess->mDriverFD <= 0) 416 return; 417 talkWithDriver(false); 418} 419 420void 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 } 470 471 // After executing the command, ensure that the thread is returned to the 472 // foreground cgroup before rejoining the pool. The driver takes care of 473 // restoring the priority, but doesn't do anything with cgroups so we 474 // need to take care of that here in userspace. Note that we do make 475 // sure to go in the foreground after executing a transaction, but 476 // there are other callbacks into user code that could have changed 477 // our group so we want to make absolutely sure it is put back. 478 set_sched_policy(mMyThreadId, SP_FOREGROUND); 479 480 // Let this thread exit the thread pool if it is no longer 481 // needed and it is not the main process thread. 482 if(result == TIMED_OUT && !isMain) { 483 break; 484 } 485 486 // HACK HACK HACK HACK HACK HACK HACK HACK HACK HACK HACK HACK HACK 487 // FIXME: we sometimes get unexplained EINVAL which causes this 488 // thread to spin forever. TEMPORARILY allow it to exit. 489 // We should probably assert on eng builds 490 if(result == -EINVAL && !isMain) { 491 ALOGE("**** THREAD %p (PID %d) ERROR (%d) LEAVING THE THREAD POOL\n", 492 (void*)pthread_self(), getpid(), result); 493 break; 494 } 495 // HACK HACK HACK HACK HACK HACK HACK HACK HACK HACK HACK HACK HACK 496 497 } while (result != -ECONNREFUSED && result != -EBADF); 498 499 LOG_THREADPOOL("**** THREAD %p (PID %d) IS LEAVING THE THREAD POOL err=%p\n", 500 (void*)pthread_self(), getpid(), (void*)result); 501 502 mOut.writeInt32(BC_EXIT_LOOPER); 503 talkWithDriver(false); 504} 505 506void IPCThreadState::stopProcess(bool immediate) 507{ 508 //ALOGI("**** STOPPING PROCESS"); 509 flushCommands(); 510 int fd = mProcess->mDriverFD; 511 mProcess->mDriverFD = -1; 512 close(fd); 513 //kill(getpid(), SIGKILL); 514} 515 516status_t IPCThreadState::transact(int32_t handle, 517 uint32_t code, const Parcel& data, 518 Parcel* reply, uint32_t flags) 519{ 520 status_t err = data.errorCheck(); 521 522 flags |= TF_ACCEPT_FDS; 523 524 IF_LOG_TRANSACTIONS() { 525 TextOutput::Bundle _b(alog); 526 alog << "BC_TRANSACTION thr " << (void*)pthread_self() << " / hand " 527 << handle << " / code " << TypeCode(code) << ": " 528 << indent << data << dedent << endl; 529 } 530 531 if (err == NO_ERROR) { 532 LOG_ONEWAY(">>>> SEND from pid %d uid %d %s", getpid(), getuid(), 533 (flags & TF_ONE_WAY) == 0 ? "READ REPLY" : "ONE WAY"); 534 err = writeTransactionData(BC_TRANSACTION, flags, handle, code, data, NULL); 535 } 536 537 if (err != NO_ERROR) { 538 if (reply) reply->setError(err); 539 return (mLastError = err); 540 } 541 542 if ((flags & TF_ONE_WAY) == 0) { 543 #if 0 544 if (code == 4) { // relayout 545 ALOGI(">>>>>> CALLING transaction 4"); 546 } else { 547 ALOGI(">>>>>> CALLING transaction %d", code); 548 } 549 #endif 550 if (reply) { 551 err = waitForResponse(reply); 552 } else { 553 Parcel fakeReply; 554 err = waitForResponse(&fakeReply); 555 } 556 #if 0 557 if (code == 4) { // relayout 558 ALOGI("<<<<<< RETURNING transaction 4"); 559 } else { 560 ALOGI("<<<<<< RETURNING transaction %d", code); 561 } 562 #endif 563 564 IF_LOG_TRANSACTIONS() { 565 TextOutput::Bundle _b(alog); 566 alog << "BR_REPLY thr " << (void*)pthread_self() << " / hand " 567 << handle << ": "; 568 if (reply) alog << indent << *reply << dedent << endl; 569 else alog << "(none requested)" << endl; 570 } 571 } else { 572 err = waitForResponse(NULL, NULL); 573 } 574 575 return err; 576} 577 578void IPCThreadState::incStrongHandle(int32_t handle) 579{ 580 LOG_REMOTEREFS("IPCThreadState::incStrongHandle(%d)\n", handle); 581 mOut.writeInt32(BC_ACQUIRE); 582 mOut.writeInt32(handle); 583} 584 585void IPCThreadState::decStrongHandle(int32_t handle) 586{ 587 LOG_REMOTEREFS("IPCThreadState::decStrongHandle(%d)\n", handle); 588 mOut.writeInt32(BC_RELEASE); 589 mOut.writeInt32(handle); 590} 591 592void IPCThreadState::incWeakHandle(int32_t handle) 593{ 594 LOG_REMOTEREFS("IPCThreadState::incWeakHandle(%d)\n", handle); 595 mOut.writeInt32(BC_INCREFS); 596 mOut.writeInt32(handle); 597} 598 599void IPCThreadState::decWeakHandle(int32_t handle) 600{ 601 LOG_REMOTEREFS("IPCThreadState::decWeakHandle(%d)\n", handle); 602 mOut.writeInt32(BC_DECREFS); 603 mOut.writeInt32(handle); 604} 605 606status_t IPCThreadState::attemptIncStrongHandle(int32_t handle) 607{ 608 LOG_REMOTEREFS("IPCThreadState::attemptIncStrongHandle(%d)\n", handle); 609 mOut.writeInt32(BC_ATTEMPT_ACQUIRE); 610 mOut.writeInt32(0); // xxx was thread priority 611 mOut.writeInt32(handle); 612 status_t result = UNKNOWN_ERROR; 613 614 waitForResponse(NULL, &result); 615 616#if LOG_REFCOUNTS 617 printf("IPCThreadState::attemptIncStrongHandle(%ld) = %s\n", 618 handle, result == NO_ERROR ? "SUCCESS" : "FAILURE"); 619#endif 620 621 return result; 622} 623 624void IPCThreadState::expungeHandle(int32_t handle, IBinder* binder) 625{ 626#if LOG_REFCOUNTS 627 printf("IPCThreadState::expungeHandle(%ld)\n", handle); 628#endif 629 self()->mProcess->expungeHandle(handle, binder); 630} 631 632status_t IPCThreadState::requestDeathNotification(int32_t handle, BpBinder* proxy) 633{ 634 mOut.writeInt32(BC_REQUEST_DEATH_NOTIFICATION); 635 mOut.writeInt32((int32_t)handle); 636 mOut.writeInt32((int32_t)proxy); 637 return NO_ERROR; 638} 639 640status_t IPCThreadState::clearDeathNotification(int32_t handle, BpBinder* proxy) 641{ 642 mOut.writeInt32(BC_CLEAR_DEATH_NOTIFICATION); 643 mOut.writeInt32((int32_t)handle); 644 mOut.writeInt32((int32_t)proxy); 645 return NO_ERROR; 646} 647 648IPCThreadState::IPCThreadState() 649 : mProcess(ProcessState::self()), 650 mMyThreadId(androidGetTid()), 651 mStrictModePolicy(0), 652 mLastTransactionBinderFlags(0) 653{ 654 pthread_setspecific(gTLS, this); 655 clearCaller(); 656 mIn.setDataCapacity(256); 657 mOut.setDataCapacity(256); 658} 659 660IPCThreadState::~IPCThreadState() 661{ 662} 663 664status_t IPCThreadState::sendReply(const Parcel& reply, uint32_t flags) 665{ 666 status_t err; 667 status_t statusBuffer; 668 err = writeTransactionData(BC_REPLY, flags, -1, 0, reply, &statusBuffer); 669 if (err < NO_ERROR) return err; 670 671 return waitForResponse(NULL, NULL); 672} 673 674status_t IPCThreadState::waitForResponse(Parcel *reply, status_t *acquireResult) 675{ 676 int32_t cmd; 677 int32_t err; 678 679 while (1) { 680 if ((err=talkWithDriver()) < NO_ERROR) break; 681 err = mIn.errorCheck(); 682 if (err < NO_ERROR) break; 683 if (mIn.dataAvail() == 0) continue; 684 685 cmd = mIn.readInt32(); 686 687 IF_LOG_COMMANDS() { 688 alog << "Processing waitForResponse Command: " 689 << getReturnString(cmd) << endl; 690 } 691 692 switch (cmd) { 693 case BR_TRANSACTION_COMPLETE: 694 if (!reply && !acquireResult) goto finish; 695 break; 696 697 case BR_DEAD_REPLY: 698 err = DEAD_OBJECT; 699 goto finish; 700 701 case BR_FAILED_REPLY: 702 err = FAILED_TRANSACTION; 703 goto finish; 704 705 case BR_ACQUIRE_RESULT: 706 { 707 ALOG_ASSERT(acquireResult != NULL, "Unexpected brACQUIRE_RESULT"); 708 const int32_t result = mIn.readInt32(); 709 if (!acquireResult) continue; 710 *acquireResult = result ? NO_ERROR : INVALID_OPERATION; 711 } 712 goto finish; 713 714 case BR_REPLY: 715 { 716 binder_transaction_data tr; 717 err = mIn.read(&tr, sizeof(tr)); 718 ALOG_ASSERT(err == NO_ERROR, "Not enough command data for brREPLY"); 719 if (err != NO_ERROR) goto finish; 720 721 if (reply) { 722 if ((tr.flags & TF_STATUS_CODE) == 0) { 723 reply->ipcSetDataReference( 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), 728 freeBuffer, this); 729 } else { 730 err = *static_cast<const status_t*>(tr.data.ptr.buffer); 731 freeBuffer(NULL, 732 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 733 tr.data_size, 734 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 735 tr.offsets_size/sizeof(size_t), this); 736 } 737 } else { 738 freeBuffer(NULL, 739 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 740 tr.data_size, 741 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 742 tr.offsets_size/sizeof(size_t), this); 743 continue; 744 } 745 } 746 goto finish; 747 748 default: 749 err = executeCommand(cmd); 750 if (err != NO_ERROR) goto finish; 751 break; 752 } 753 } 754 755finish: 756 if (err != NO_ERROR) { 757 if (acquireResult) *acquireResult = err; 758 if (reply) reply->setError(err); 759 mLastError = err; 760 } 761 762 return err; 763} 764 765status_t IPCThreadState::talkWithDriver(bool doReceive) 766{ 767 if (mProcess->mDriverFD <= 0) { 768 return -EBADF; 769 } 770 771 binder_write_read bwr; 772 773 // Is the read buffer empty? 774 const bool needRead = mIn.dataPosition() >= mIn.dataSize(); 775 776 // We don't want to write anything if we are still reading 777 // from data left in the input buffer and the caller 778 // has requested to read the next data. 779 const size_t outAvail = (!doReceive || needRead) ? mOut.dataSize() : 0; 780 781 bwr.write_size = outAvail; 782 bwr.write_buffer = (long unsigned int)mOut.data(); 783 784 // This is what we'll read. 785 if (doReceive && needRead) { 786 bwr.read_size = mIn.dataCapacity(); 787 bwr.read_buffer = (long unsigned int)mIn.data(); 788 } else { 789 bwr.read_size = 0; 790 bwr.read_buffer = 0; 791 } 792 793 IF_LOG_COMMANDS() { 794 TextOutput::Bundle _b(alog); 795 if (outAvail != 0) { 796 alog << "Sending commands to driver: " << indent; 797 const void* cmds = (const void*)bwr.write_buffer; 798 const void* end = ((const uint8_t*)cmds)+bwr.write_size; 799 alog << HexDump(cmds, bwr.write_size) << endl; 800 while (cmds < end) cmds = printCommand(alog, cmds); 801 alog << dedent; 802 } 803 alog << "Size of receive buffer: " << bwr.read_size 804 << ", needRead: " << needRead << ", doReceive: " << doReceive << endl; 805 } 806 807 // Return immediately if there is nothing to do. 808 if ((bwr.write_size == 0) && (bwr.read_size == 0)) return NO_ERROR; 809 810 bwr.write_consumed = 0; 811 bwr.read_consumed = 0; 812 status_t err; 813 do { 814 IF_LOG_COMMANDS() { 815 alog << "About to read/write, write size = " << mOut.dataSize() << endl; 816 } 817#if defined(HAVE_ANDROID_OS) 818 if (ioctl(mProcess->mDriverFD, BINDER_WRITE_READ, &bwr) >= 0) 819 err = NO_ERROR; 820 else 821 err = -errno; 822#else 823 err = INVALID_OPERATION; 824#endif 825 if (mProcess->mDriverFD <= 0) { 826 err = -EBADF; 827 } 828 IF_LOG_COMMANDS() { 829 alog << "Finished read/write, write size = " << mOut.dataSize() << endl; 830 } 831 } while (err == -EINTR); 832 833 IF_LOG_COMMANDS() { 834 alog << "Our err: " << (void*)err << ", write consumed: " 835 << bwr.write_consumed << " (of " << mOut.dataSize() 836 << "), read consumed: " << bwr.read_consumed << endl; 837 } 838 839 if (err >= NO_ERROR) { 840 if (bwr.write_consumed > 0) { 841 if (bwr.write_consumed < (ssize_t)mOut.dataSize()) 842 mOut.remove(0, bwr.write_consumed); 843 else 844 mOut.setDataSize(0); 845 } 846 if (bwr.read_consumed > 0) { 847 mIn.setDataSize(bwr.read_consumed); 848 mIn.setDataPosition(0); 849 } 850 IF_LOG_COMMANDS() { 851 TextOutput::Bundle _b(alog); 852 alog << "Remaining data size: " << mOut.dataSize() << endl; 853 alog << "Received commands from driver: " << indent; 854 const void* cmds = mIn.data(); 855 const void* end = mIn.data() + mIn.dataSize(); 856 alog << HexDump(cmds, mIn.dataSize()) << endl; 857 while (cmds < end) cmds = printReturnCommand(alog, cmds); 858 alog << dedent; 859 } 860 return NO_ERROR; 861 } 862 863 return err; 864} 865 866status_t IPCThreadState::writeTransactionData(int32_t cmd, uint32_t binderFlags, 867 int32_t handle, uint32_t code, const Parcel& data, status_t* statusBuffer) 868{ 869 binder_transaction_data tr; 870 871 tr.target.handle = handle; 872 tr.code = code; 873 tr.flags = binderFlags; 874 tr.cookie = 0; 875 tr.sender_pid = 0; 876 tr.sender_euid = 0; 877 878 const status_t err = data.errorCheck(); 879 if (err == NO_ERROR) { 880 tr.data_size = data.ipcDataSize(); 881 tr.data.ptr.buffer = data.ipcData(); 882 tr.offsets_size = data.ipcObjectsCount()*sizeof(size_t); 883 tr.data.ptr.offsets = data.ipcObjects(); 884 } else if (statusBuffer) { 885 tr.flags |= TF_STATUS_CODE; 886 *statusBuffer = err; 887 tr.data_size = sizeof(status_t); 888 tr.data.ptr.buffer = statusBuffer; 889 tr.offsets_size = 0; 890 tr.data.ptr.offsets = NULL; 891 } else { 892 return (mLastError = err); 893 } 894 895 mOut.writeInt32(cmd); 896 mOut.write(&tr, sizeof(tr)); 897 898 return NO_ERROR; 899} 900 901sp<BBinder> the_context_object; 902 903void setTheContextObject(sp<BBinder> obj) 904{ 905 the_context_object = obj; 906} 907 908status_t IPCThreadState::executeCommand(int32_t cmd) 909{ 910 BBinder* obj; 911 RefBase::weakref_type* refs; 912 status_t result = NO_ERROR; 913 914 switch (cmd) { 915 case BR_ERROR: 916 result = mIn.readInt32(); 917 break; 918 919 case BR_OK: 920 break; 921 922 case BR_ACQUIRE: 923 refs = (RefBase::weakref_type*)mIn.readInt32(); 924 obj = (BBinder*)mIn.readInt32(); 925 ALOG_ASSERT(refs->refBase() == obj, 926 "BR_ACQUIRE: object %p does not match cookie %p (expected %p)", 927 refs, obj, refs->refBase()); 928 obj->incStrong(mProcess.get()); 929 IF_LOG_REMOTEREFS() { 930 LOG_REMOTEREFS("BR_ACQUIRE from driver on %p", obj); 931 obj->printRefs(); 932 } 933 mOut.writeInt32(BC_ACQUIRE_DONE); 934 mOut.writeInt32((int32_t)refs); 935 mOut.writeInt32((int32_t)obj); 936 break; 937 938 case BR_RELEASE: 939 refs = (RefBase::weakref_type*)mIn.readInt32(); 940 obj = (BBinder*)mIn.readInt32(); 941 ALOG_ASSERT(refs->refBase() == obj, 942 "BR_RELEASE: object %p does not match cookie %p (expected %p)", 943 refs, obj, refs->refBase()); 944 IF_LOG_REMOTEREFS() { 945 LOG_REMOTEREFS("BR_RELEASE from driver on %p", obj); 946 obj->printRefs(); 947 } 948 mPendingStrongDerefs.push(obj); 949 break; 950 951 case BR_INCREFS: 952 refs = (RefBase::weakref_type*)mIn.readInt32(); 953 obj = (BBinder*)mIn.readInt32(); 954 refs->incWeak(mProcess.get()); 955 mOut.writeInt32(BC_INCREFS_DONE); 956 mOut.writeInt32((int32_t)refs); 957 mOut.writeInt32((int32_t)obj); 958 break; 959 960 case BR_DECREFS: 961 refs = (RefBase::weakref_type*)mIn.readInt32(); 962 obj = (BBinder*)mIn.readInt32(); 963 // NOTE: This assertion is not valid, because the object may no 964 // longer exist (thus the (BBinder*)cast above resulting in a different 965 // memory address). 966 //ALOG_ASSERT(refs->refBase() == obj, 967 // "BR_DECREFS: object %p does not match cookie %p (expected %p)", 968 // refs, obj, refs->refBase()); 969 mPendingWeakDerefs.push(refs); 970 break; 971 972 case BR_ATTEMPT_ACQUIRE: 973 refs = (RefBase::weakref_type*)mIn.readInt32(); 974 obj = (BBinder*)mIn.readInt32(); 975 976 { 977 const bool success = refs->attemptIncStrong(mProcess.get()); 978 ALOG_ASSERT(success && refs->refBase() == obj, 979 "BR_ATTEMPT_ACQUIRE: object %p does not match cookie %p (expected %p)", 980 refs, obj, refs->refBase()); 981 982 mOut.writeInt32(BC_ACQUIRE_RESULT); 983 mOut.writeInt32((int32_t)success); 984 } 985 break; 986 987 case BR_TRANSACTION: 988 { 989 binder_transaction_data tr; 990 result = mIn.read(&tr, sizeof(tr)); 991 ALOG_ASSERT(result == NO_ERROR, 992 "Not enough command data for brTRANSACTION"); 993 if (result != NO_ERROR) break; 994 995 Parcel buffer; 996 buffer.ipcSetDataReference( 997 reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), 998 tr.data_size, 999 reinterpret_cast<const size_t*>(tr.data.ptr.offsets), 1000 tr.offsets_size/sizeof(size_t), freeBuffer, this); 1001 1002 const pid_t origPid = mCallingPid; 1003 const uid_t origUid = mCallingUid; 1004 1005 mCallingPid = tr.sender_pid; 1006 mCallingUid = tr.sender_euid; 1007 1008 int curPrio = getpriority(PRIO_PROCESS, mMyThreadId); 1009 if (gDisableBackgroundScheduling) { 1010 if (curPrio > ANDROID_PRIORITY_NORMAL) { 1011 // We have inherited a reduced priority from the caller, but do not 1012 // want to run in that state in this process. The driver set our 1013 // priority already (though not our scheduling class), so bounce 1014 // it back to the default before invoking the transaction. 1015 setpriority(PRIO_PROCESS, mMyThreadId, ANDROID_PRIORITY_NORMAL); 1016 } 1017 } else { 1018 if (curPrio >= ANDROID_PRIORITY_BACKGROUND) { 1019 // We want to use the inherited priority from the caller. 1020 // Ensure this thread is in the background scheduling class, 1021 // since the driver won't modify scheduling classes for us. 1022 // The scheduling group is reset to default by the caller 1023 // once this method returns after the transaction is complete. 1024 set_sched_policy(mMyThreadId, SP_BACKGROUND); 1025 } 1026 } 1027 1028 //ALOGI(">>>> TRANSACT from pid %d uid %d\n", mCallingPid, mCallingUid); 1029 1030 Parcel reply; 1031 IF_LOG_TRANSACTIONS() { 1032 TextOutput::Bundle _b(alog); 1033 alog << "BR_TRANSACTION thr " << (void*)pthread_self() 1034 << " / obj " << tr.target.ptr << " / code " 1035 << TypeCode(tr.code) << ": " << indent << buffer 1036 << dedent << endl 1037 << "Data addr = " 1038 << reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer) 1039 << ", offsets addr=" 1040 << reinterpret_cast<const size_t*>(tr.data.ptr.offsets) << endl; 1041 } 1042 if (tr.target.ptr) { 1043 sp<BBinder> b((BBinder*)tr.cookie); 1044 const status_t error = b->transact(tr.code, buffer, &reply, tr.flags); 1045 if (error < NO_ERROR) reply.setError(error); 1046 1047 } else { 1048 const status_t error = the_context_object->transact(tr.code, buffer, &reply, tr.flags); 1049 if (error < NO_ERROR) reply.setError(error); 1050 } 1051 1052 //ALOGI("<<<< TRANSACT from pid %d restore pid %d uid %d\n", 1053 // mCallingPid, origPid, origUid); 1054 1055 if ((tr.flags & TF_ONE_WAY) == 0) { 1056 LOG_ONEWAY("Sending reply to %d!", mCallingPid); 1057 sendReply(reply, 0); 1058 } else { 1059 LOG_ONEWAY("NOT sending reply to %d!", mCallingPid); 1060 } 1061 1062 mCallingPid = origPid; 1063 mCallingUid = origUid; 1064 1065 IF_LOG_TRANSACTIONS() { 1066 TextOutput::Bundle _b(alog); 1067 alog << "BC_REPLY thr " << (void*)pthread_self() << " / obj " 1068 << tr.target.ptr << ": " << indent << reply << dedent << endl; 1069 } 1070 1071 } 1072 break; 1073 1074 case BR_DEAD_BINDER: 1075 { 1076 BpBinder *proxy = (BpBinder*)mIn.readInt32(); 1077 proxy->sendObituary(); 1078 mOut.writeInt32(BC_DEAD_BINDER_DONE); 1079 mOut.writeInt32((int32_t)proxy); 1080 } break; 1081 1082 case BR_CLEAR_DEATH_NOTIFICATION_DONE: 1083 { 1084 BpBinder *proxy = (BpBinder*)mIn.readInt32(); 1085 proxy->getWeakRefs()->decWeak(proxy); 1086 } break; 1087 1088 case BR_FINISHED: 1089 result = TIMED_OUT; 1090 break; 1091 1092 case BR_NOOP: 1093 break; 1094 1095 case BR_SPAWN_LOOPER: 1096 mProcess->spawnPooledThread(false); 1097 break; 1098 1099 default: 1100 printf("*** BAD COMMAND %d received from Binder driver\n", cmd); 1101 result = UNKNOWN_ERROR; 1102 break; 1103 } 1104 1105 if (result != NO_ERROR) { 1106 mLastError = result; 1107 } 1108 1109 return result; 1110} 1111 1112void IPCThreadState::threadDestructor(void *st) 1113{ 1114 IPCThreadState* const self = static_cast<IPCThreadState*>(st); 1115 if (self) { 1116 self->flushCommands(); 1117#if defined(HAVE_ANDROID_OS) 1118 if (self->mProcess->mDriverFD > 0) { 1119 ioctl(self->mProcess->mDriverFD, BINDER_THREAD_EXIT, 0); 1120 } 1121#endif 1122 delete self; 1123 } 1124} 1125 1126 1127void IPCThreadState::freeBuffer(Parcel* parcel, const uint8_t* data, size_t dataSize, 1128 const size_t* objects, size_t objectsSize, 1129 void* cookie) 1130{ 1131 //ALOGI("Freeing parcel %p", &parcel); 1132 IF_LOG_COMMANDS() { 1133 alog << "Writing BC_FREE_BUFFER for " << data << endl; 1134 } 1135 ALOG_ASSERT(data != NULL, "Called with NULL data"); 1136 if (parcel != NULL) parcel->closeFileDescriptors(); 1137 IPCThreadState* state = self(); 1138 state->mOut.writeInt32(BC_FREE_BUFFER); 1139 state->mOut.writeInt32((int32_t)data); 1140} 1141 1142}; // namespace android 1143