| /* |
| * Copyright (C) 2005 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "IPCThreadState" |
| |
| #include <binder/IPCThreadState.h> |
| |
| #include <binder/Binder.h> |
| #include <binder/BpBinder.h> |
| #include <cutils/sched_policy.h> |
| #include <utils/Debug.h> |
| #include <utils/Log.h> |
| #include <utils/TextOutput.h> |
| #include <utils/threads.h> |
| |
| #include <private/binder/binder_module.h> |
| #include <private/binder/Static.h> |
| |
| #include <sys/ioctl.h> |
| #include <signal.h> |
| #include <errno.h> |
| #include <stdio.h> |
| #include <unistd.h> |
| |
| #ifdef HAVE_PTHREADS |
| #include <pthread.h> |
| #include <sched.h> |
| #include <sys/resource.h> |
| #endif |
| #ifdef HAVE_WIN32_THREADS |
| #include <windows.h> |
| #endif |
| |
| |
| #if LOG_NDEBUG |
| |
| #define IF_LOG_TRANSACTIONS() if (false) |
| #define IF_LOG_COMMANDS() if (false) |
| #define LOG_REMOTEREFS(...) |
| #define IF_LOG_REMOTEREFS() if (false) |
| #define LOG_THREADPOOL(...) |
| #define LOG_ONEWAY(...) |
| |
| #else |
| |
| #define IF_LOG_TRANSACTIONS() IF_ALOG(LOG_VERBOSE, "transact") |
| #define IF_LOG_COMMANDS() IF_ALOG(LOG_VERBOSE, "ipc") |
| #define LOG_REMOTEREFS(...) ALOG(LOG_DEBUG, "remoterefs", __VA_ARGS__) |
| #define IF_LOG_REMOTEREFS() IF_ALOG(LOG_DEBUG, "remoterefs") |
| #define LOG_THREADPOOL(...) ALOG(LOG_DEBUG, "threadpool", __VA_ARGS__) |
| #define LOG_ONEWAY(...) ALOG(LOG_DEBUG, "ipc", __VA_ARGS__) |
| |
| #endif |
| |
| // --------------------------------------------------------------------------- |
| |
| namespace android { |
| |
| static const char* getReturnString(size_t idx); |
| static const char* getCommandString(size_t idx); |
| static const void* printReturnCommand(TextOutput& out, const void* _cmd); |
| static const void* printCommand(TextOutput& out, const void* _cmd); |
| |
| // This will result in a missing symbol failure if the IF_LOG_COMMANDS() |
| // conditionals don't get stripped... but that is probably what we want. |
| #if !LOG_NDEBUG |
| static const char *kReturnStrings[] = { |
| "BR_ERROR", |
| "BR_OK", |
| "BR_TRANSACTION", |
| "BR_REPLY", |
| "BR_ACQUIRE_RESULT", |
| "BR_DEAD_REPLY", |
| "BR_TRANSACTION_COMPLETE", |
| "BR_INCREFS", |
| "BR_ACQUIRE", |
| "BR_RELEASE", |
| "BR_DECREFS", |
| "BR_ATTEMPT_ACQUIRE", |
| "BR_NOOP", |
| "BR_SPAWN_LOOPER", |
| "BR_FINISHED", |
| "BR_DEAD_BINDER", |
| "BR_CLEAR_DEATH_NOTIFICATION_DONE", |
| "BR_FAILED_REPLY" |
| }; |
| |
| static const char *kCommandStrings[] = { |
| "BC_TRANSACTION", |
| "BC_REPLY", |
| "BC_ACQUIRE_RESULT", |
| "BC_FREE_BUFFER", |
| "BC_INCREFS", |
| "BC_ACQUIRE", |
| "BC_RELEASE", |
| "BC_DECREFS", |
| "BC_INCREFS_DONE", |
| "BC_ACQUIRE_DONE", |
| "BC_ATTEMPT_ACQUIRE", |
| "BC_REGISTER_LOOPER", |
| "BC_ENTER_LOOPER", |
| "BC_EXIT_LOOPER", |
| "BC_REQUEST_DEATH_NOTIFICATION", |
| "BC_CLEAR_DEATH_NOTIFICATION", |
| "BC_DEAD_BINDER_DONE" |
| }; |
| |
| static const char* getReturnString(size_t idx) |
| { |
| if (idx < sizeof(kReturnStrings) / sizeof(kReturnStrings[0])) |
| return kReturnStrings[idx]; |
| else |
| return "unknown"; |
| } |
| |
| static const char* getCommandString(size_t idx) |
| { |
| if (idx < sizeof(kCommandStrings) / sizeof(kCommandStrings[0])) |
| return kCommandStrings[idx]; |
| else |
| return "unknown"; |
| } |
| |
| static const void* printBinderTransactionData(TextOutput& out, const void* data) |
| { |
| const binder_transaction_data* btd = |
| (const binder_transaction_data*)data; |
| if (btd->target.handle < 1024) { |
| /* want to print descriptors in decimal; guess based on value */ |
| out << "target.desc=" << btd->target.handle; |
| } else { |
| out << "target.ptr=" << btd->target.ptr; |
| } |
| out << " (cookie " << btd->cookie << ")" << endl |
| << "code=" << TypeCode(btd->code) << ", flags=" << (void*)btd->flags << endl |
| << "data=" << btd->data.ptr.buffer << " (" << (void*)btd->data_size |
| << " bytes)" << endl |
| << "offsets=" << btd->data.ptr.offsets << " (" << (void*)btd->offsets_size |
| << " bytes)"; |
| return btd+1; |
| } |
| |
| static const void* printReturnCommand(TextOutput& out, const void* _cmd) |
| { |
| static const size_t N = sizeof(kReturnStrings)/sizeof(kReturnStrings[0]); |
| const int32_t* cmd = (const int32_t*)_cmd; |
| int32_t code = *cmd++; |
| size_t cmdIndex = code & 0xff; |
| if (code == (int32_t) BR_ERROR) { |
| out << "BR_ERROR: " << (void*)(*cmd++) << endl; |
| return cmd; |
| } else if (cmdIndex >= N) { |
| out << "Unknown reply: " << code << endl; |
| return cmd; |
| } |
| out << kReturnStrings[cmdIndex]; |
| |
| switch (code) { |
| case BR_TRANSACTION: |
| case BR_REPLY: { |
| out << ": " << indent; |
| cmd = (const int32_t *)printBinderTransactionData(out, cmd); |
| out << dedent; |
| } break; |
| |
| case BR_ACQUIRE_RESULT: { |
| const int32_t res = *cmd++; |
| out << ": " << res << (res ? " (SUCCESS)" : " (FAILURE)"); |
| } break; |
| |
| case BR_INCREFS: |
| case BR_ACQUIRE: |
| case BR_RELEASE: |
| case BR_DECREFS: { |
| const int32_t b = *cmd++; |
| const int32_t c = *cmd++; |
| out << ": target=" << (void*)b << " (cookie " << (void*)c << ")"; |
| } break; |
| |
| case BR_ATTEMPT_ACQUIRE: { |
| const int32_t p = *cmd++; |
| const int32_t b = *cmd++; |
| const int32_t c = *cmd++; |
| out << ": target=" << (void*)b << " (cookie " << (void*)c |
| << "), pri=" << p; |
| } break; |
| |
| case BR_DEAD_BINDER: |
| case BR_CLEAR_DEATH_NOTIFICATION_DONE: { |
| const int32_t c = *cmd++; |
| out << ": death cookie " << (void*)c; |
| } break; |
| |
| default: |
| // no details to show for: BR_OK, BR_DEAD_REPLY, |
| // BR_TRANSACTION_COMPLETE, BR_FINISHED |
| break; |
| } |
| |
| out << endl; |
| return cmd; |
| } |
| |
| static const void* printCommand(TextOutput& out, const void* _cmd) |
| { |
| static const size_t N = sizeof(kCommandStrings)/sizeof(kCommandStrings[0]); |
| const int32_t* cmd = (const int32_t*)_cmd; |
| int32_t code = *cmd++; |
| size_t cmdIndex = code & 0xff; |
| |
| if (cmdIndex >= N) { |
| out << "Unknown command: " << code << endl; |
| return cmd; |
| } |
| out << kCommandStrings[cmdIndex]; |
| |
| switch (code) { |
| case BC_TRANSACTION: |
| case BC_REPLY: { |
| out << ": " << indent; |
| cmd = (const int32_t *)printBinderTransactionData(out, cmd); |
| out << dedent; |
| } break; |
| |
| case BC_ACQUIRE_RESULT: { |
| const int32_t res = *cmd++; |
| out << ": " << res << (res ? " (SUCCESS)" : " (FAILURE)"); |
| } break; |
| |
| case BC_FREE_BUFFER: { |
| const int32_t buf = *cmd++; |
| out << ": buffer=" << (void*)buf; |
| } break; |
| |
| case BC_INCREFS: |
| case BC_ACQUIRE: |
| case BC_RELEASE: |
| case BC_DECREFS: { |
| const int32_t d = *cmd++; |
| out << ": desc=" << d; |
| } break; |
| |
| case BC_INCREFS_DONE: |
| case BC_ACQUIRE_DONE: { |
| const int32_t b = *cmd++; |
| const int32_t c = *cmd++; |
| out << ": target=" << (void*)b << " (cookie " << (void*)c << ")"; |
| } break; |
| |
| case BC_ATTEMPT_ACQUIRE: { |
| const int32_t p = *cmd++; |
| const int32_t d = *cmd++; |
| out << ": desc=" << d << ", pri=" << p; |
| } break; |
| |
| case BC_REQUEST_DEATH_NOTIFICATION: |
| case BC_CLEAR_DEATH_NOTIFICATION: { |
| const int32_t h = *cmd++; |
| const int32_t c = *cmd++; |
| out << ": handle=" << h << " (death cookie " << (void*)c << ")"; |
| } break; |
| |
| case BC_DEAD_BINDER_DONE: { |
| const int32_t c = *cmd++; |
| out << ": death cookie " << (void*)c; |
| } break; |
| |
| default: |
| // no details to show for: BC_REGISTER_LOOPER, BC_ENTER_LOOPER, |
| // BC_EXIT_LOOPER |
| break; |
| } |
| |
| out << endl; |
| return cmd; |
| } |
| #endif |
| |
| static pthread_mutex_t gTLSMutex = PTHREAD_MUTEX_INITIALIZER; |
| static bool gHaveTLS = false; |
| static pthread_key_t gTLS = 0; |
| static bool gShutdown = false; |
| static bool gDisableBackgroundScheduling = false; |
| |
| IPCThreadState* IPCThreadState::self() |
| { |
| if (gHaveTLS) { |
| restart: |
| const pthread_key_t k = gTLS; |
| IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k); |
| if (st) return st; |
| return new IPCThreadState; |
| } |
| |
| if (gShutdown) return NULL; |
| |
| pthread_mutex_lock(&gTLSMutex); |
| if (!gHaveTLS) { |
| if (pthread_key_create(&gTLS, threadDestructor) != 0) { |
| pthread_mutex_unlock(&gTLSMutex); |
| return NULL; |
| } |
| gHaveTLS = true; |
| } |
| pthread_mutex_unlock(&gTLSMutex); |
| goto restart; |
| } |
| |
| IPCThreadState* IPCThreadState::selfOrNull() |
| { |
| if (gHaveTLS) { |
| const pthread_key_t k = gTLS; |
| IPCThreadState* st = (IPCThreadState*)pthread_getspecific(k); |
| return st; |
| } |
| return NULL; |
| } |
| |
| void IPCThreadState::shutdown() |
| { |
| gShutdown = true; |
| |
| if (gHaveTLS) { |
| // XXX Need to wait for all thread pool threads to exit! |
| IPCThreadState* st = (IPCThreadState*)pthread_getspecific(gTLS); |
| if (st) { |
| delete st; |
| pthread_setspecific(gTLS, NULL); |
| } |
| gHaveTLS = false; |
| } |
| } |
| |
| void IPCThreadState::disableBackgroundScheduling(bool disable) |
| { |
| gDisableBackgroundScheduling = disable; |
| } |
| |
| sp<ProcessState> IPCThreadState::process() |
| { |
| return mProcess; |
| } |
| |
| status_t IPCThreadState::clearLastError() |
| { |
| const status_t err = mLastError; |
| mLastError = NO_ERROR; |
| return err; |
| } |
| |
| int IPCThreadState::getCallingPid() |
| { |
| return mCallingPid; |
| } |
| |
| int IPCThreadState::getCallingUid() |
| { |
| return mCallingUid; |
| } |
| |
| int64_t IPCThreadState::clearCallingIdentity() |
| { |
| int64_t token = ((int64_t)mCallingUid<<32) | mCallingPid; |
| clearCaller(); |
| return token; |
| } |
| |
| void IPCThreadState::setStrictModePolicy(int32_t policy) |
| { |
| mStrictModePolicy = policy; |
| } |
| |
| int32_t IPCThreadState::getStrictModePolicy() const |
| { |
| return mStrictModePolicy; |
| } |
| |
| void IPCThreadState::setLastTransactionBinderFlags(int32_t flags) |
| { |
| mLastTransactionBinderFlags = flags; |
| } |
| |
| int32_t IPCThreadState::getLastTransactionBinderFlags() const |
| { |
| return mLastTransactionBinderFlags; |
| } |
| |
| void IPCThreadState::restoreCallingIdentity(int64_t token) |
| { |
| mCallingUid = (int)(token>>32); |
| mCallingPid = (int)token; |
| } |
| |
| void IPCThreadState::clearCaller() |
| { |
| mCallingPid = getpid(); |
| mCallingUid = getuid(); |
| } |
| |
| void IPCThreadState::flushCommands() |
| { |
| if (mProcess->mDriverFD <= 0) |
| return; |
| talkWithDriver(false); |
| } |
| |
| void IPCThreadState::joinThreadPool(bool isMain) |
| { |
| LOG_THREADPOOL("**** THREAD %p (PID %d) IS JOINING THE THREAD POOL\n", (void*)pthread_self(), getpid()); |
| |
| mOut.writeInt32(isMain ? BC_ENTER_LOOPER : BC_REGISTER_LOOPER); |
| |
| // This thread may have been spawned by a thread that was in the background |
| // scheduling group, so first we will make sure it is in the foreground |
| // one to avoid performing an initial transaction in the background. |
| set_sched_policy(mMyThreadId, SP_FOREGROUND); |
| |
| status_t result; |
| do { |
| int32_t cmd; |
| |
| // When we've cleared the incoming command queue, process any pending derefs |
| if (mIn.dataPosition() >= mIn.dataSize()) { |
| size_t numPending = mPendingWeakDerefs.size(); |
| if (numPending > 0) { |
| for (size_t i = 0; i < numPending; i++) { |
| RefBase::weakref_type* refs = mPendingWeakDerefs[i]; |
| refs->decWeak(mProcess.get()); |
| } |
| mPendingWeakDerefs.clear(); |
| } |
| |
| numPending = mPendingStrongDerefs.size(); |
| if (numPending > 0) { |
| for (size_t i = 0; i < numPending; i++) { |
| BBinder* obj = mPendingStrongDerefs[i]; |
| obj->decStrong(mProcess.get()); |
| } |
| mPendingStrongDerefs.clear(); |
| } |
| } |
| |
| // now get the next command to be processed, waiting if necessary |
| result = talkWithDriver(); |
| if (result >= NO_ERROR) { |
| size_t IN = mIn.dataAvail(); |
| if (IN < sizeof(int32_t)) continue; |
| cmd = mIn.readInt32(); |
| IF_LOG_COMMANDS() { |
| alog << "Processing top-level Command: " |
| << getReturnString(cmd) << endl; |
| } |
| |
| |
| result = executeCommand(cmd); |
| } |
| |
| // After executing the command, ensure that the thread is returned to the |
| // foreground cgroup before rejoining the pool. The driver takes care of |
| // restoring the priority, but doesn't do anything with cgroups so we |
| // need to take care of that here in userspace. Note that we do make |
| // sure to go in the foreground after executing a transaction, but |
| // there are other callbacks into user code that could have changed |
| // our group so we want to make absolutely sure it is put back. |
| set_sched_policy(mMyThreadId, SP_FOREGROUND); |
| |
| // Let this thread exit the thread pool if it is no longer |
| // needed and it is not the main process thread. |
| if(result == TIMED_OUT && !isMain) { |
| break; |
| } |
| } while (result != -ECONNREFUSED && result != -EBADF); |
| |
| LOG_THREADPOOL("**** THREAD %p (PID %d) IS LEAVING THE THREAD POOL err=%p\n", |
| (void*)pthread_self(), getpid(), (void*)result); |
| |
| mOut.writeInt32(BC_EXIT_LOOPER); |
| talkWithDriver(false); |
| } |
| |
| void IPCThreadState::stopProcess(bool immediate) |
| { |
| //ALOGI("**** STOPPING PROCESS"); |
| flushCommands(); |
| int fd = mProcess->mDriverFD; |
| mProcess->mDriverFD = -1; |
| close(fd); |
| //kill(getpid(), SIGKILL); |
| } |
| |
| status_t IPCThreadState::transact(int32_t handle, |
| uint32_t code, const Parcel& data, |
| Parcel* reply, uint32_t flags) |
| { |
| status_t err = data.errorCheck(); |
| |
| flags |= TF_ACCEPT_FDS; |
| |
| IF_LOG_TRANSACTIONS() { |
| TextOutput::Bundle _b(alog); |
| alog << "BC_TRANSACTION thr " << (void*)pthread_self() << " / hand " |
| << handle << " / code " << TypeCode(code) << ": " |
| << indent << data << dedent << endl; |
| } |
| |
| if (err == NO_ERROR) { |
| LOG_ONEWAY(">>>> SEND from pid %d uid %d %s", getpid(), getuid(), |
| (flags & TF_ONE_WAY) == 0 ? "READ REPLY" : "ONE WAY"); |
| err = writeTransactionData(BC_TRANSACTION, flags, handle, code, data, NULL); |
| } |
| |
| if (err != NO_ERROR) { |
| if (reply) reply->setError(err); |
| return (mLastError = err); |
| } |
| |
| if ((flags & TF_ONE_WAY) == 0) { |
| #if 0 |
| if (code == 4) { // relayout |
| ALOGI(">>>>>> CALLING transaction 4"); |
| } else { |
| ALOGI(">>>>>> CALLING transaction %d", code); |
| } |
| #endif |
| if (reply) { |
| err = waitForResponse(reply); |
| } else { |
| Parcel fakeReply; |
| err = waitForResponse(&fakeReply); |
| } |
| #if 0 |
| if (code == 4) { // relayout |
| ALOGI("<<<<<< RETURNING transaction 4"); |
| } else { |
| ALOGI("<<<<<< RETURNING transaction %d", code); |
| } |
| #endif |
| |
| IF_LOG_TRANSACTIONS() { |
| TextOutput::Bundle _b(alog); |
| alog << "BR_REPLY thr " << (void*)pthread_self() << " / hand " |
| << handle << ": "; |
| if (reply) alog << indent << *reply << dedent << endl; |
| else alog << "(none requested)" << endl; |
| } |
| } else { |
| err = waitForResponse(NULL, NULL); |
| } |
| |
| return err; |
| } |
| |
| void IPCThreadState::incStrongHandle(int32_t handle) |
| { |
| LOG_REMOTEREFS("IPCThreadState::incStrongHandle(%d)\n", handle); |
| mOut.writeInt32(BC_ACQUIRE); |
| mOut.writeInt32(handle); |
| } |
| |
| void IPCThreadState::decStrongHandle(int32_t handle) |
| { |
| LOG_REMOTEREFS("IPCThreadState::decStrongHandle(%d)\n", handle); |
| mOut.writeInt32(BC_RELEASE); |
| mOut.writeInt32(handle); |
| } |
| |
| void IPCThreadState::incWeakHandle(int32_t handle) |
| { |
| LOG_REMOTEREFS("IPCThreadState::incWeakHandle(%d)\n", handle); |
| mOut.writeInt32(BC_INCREFS); |
| mOut.writeInt32(handle); |
| } |
| |
| void IPCThreadState::decWeakHandle(int32_t handle) |
| { |
| LOG_REMOTEREFS("IPCThreadState::decWeakHandle(%d)\n", handle); |
| mOut.writeInt32(BC_DECREFS); |
| mOut.writeInt32(handle); |
| } |
| |
| status_t IPCThreadState::attemptIncStrongHandle(int32_t handle) |
| { |
| LOG_REMOTEREFS("IPCThreadState::attemptIncStrongHandle(%d)\n", handle); |
| mOut.writeInt32(BC_ATTEMPT_ACQUIRE); |
| mOut.writeInt32(0); // xxx was thread priority |
| mOut.writeInt32(handle); |
| status_t result = UNKNOWN_ERROR; |
| |
| waitForResponse(NULL, &result); |
| |
| #if LOG_REFCOUNTS |
| printf("IPCThreadState::attemptIncStrongHandle(%ld) = %s\n", |
| handle, result == NO_ERROR ? "SUCCESS" : "FAILURE"); |
| #endif |
| |
| return result; |
| } |
| |
| void IPCThreadState::expungeHandle(int32_t handle, IBinder* binder) |
| { |
| #if LOG_REFCOUNTS |
| printf("IPCThreadState::expungeHandle(%ld)\n", handle); |
| #endif |
| self()->mProcess->expungeHandle(handle, binder); |
| } |
| |
| status_t IPCThreadState::requestDeathNotification(int32_t handle, BpBinder* proxy) |
| { |
| mOut.writeInt32(BC_REQUEST_DEATH_NOTIFICATION); |
| mOut.writeInt32((int32_t)handle); |
| mOut.writeInt32((int32_t)proxy); |
| return NO_ERROR; |
| } |
| |
| status_t IPCThreadState::clearDeathNotification(int32_t handle, BpBinder* proxy) |
| { |
| mOut.writeInt32(BC_CLEAR_DEATH_NOTIFICATION); |
| mOut.writeInt32((int32_t)handle); |
| mOut.writeInt32((int32_t)proxy); |
| return NO_ERROR; |
| } |
| |
| IPCThreadState::IPCThreadState() |
| : mProcess(ProcessState::self()), |
| mMyThreadId(androidGetTid()), |
| mStrictModePolicy(0), |
| mLastTransactionBinderFlags(0) |
| { |
| pthread_setspecific(gTLS, this); |
| clearCaller(); |
| mIn.setDataCapacity(256); |
| mOut.setDataCapacity(256); |
| } |
| |
| IPCThreadState::~IPCThreadState() |
| { |
| } |
| |
| status_t IPCThreadState::sendReply(const Parcel& reply, uint32_t flags) |
| { |
| status_t err; |
| status_t statusBuffer; |
| err = writeTransactionData(BC_REPLY, flags, -1, 0, reply, &statusBuffer); |
| if (err < NO_ERROR) return err; |
| |
| return waitForResponse(NULL, NULL); |
| } |
| |
| status_t IPCThreadState::waitForResponse(Parcel *reply, status_t *acquireResult) |
| { |
| int32_t cmd; |
| int32_t err; |
| |
| while (1) { |
| if ((err=talkWithDriver()) < NO_ERROR) break; |
| err = mIn.errorCheck(); |
| if (err < NO_ERROR) break; |
| if (mIn.dataAvail() == 0) continue; |
| |
| cmd = mIn.readInt32(); |
| |
| IF_LOG_COMMANDS() { |
| alog << "Processing waitForResponse Command: " |
| << getReturnString(cmd) << endl; |
| } |
| |
| switch (cmd) { |
| case BR_TRANSACTION_COMPLETE: |
| if (!reply && !acquireResult) goto finish; |
| break; |
| |
| case BR_DEAD_REPLY: |
| err = DEAD_OBJECT; |
| goto finish; |
| |
| case BR_FAILED_REPLY: |
| err = FAILED_TRANSACTION; |
| goto finish; |
| |
| case BR_ACQUIRE_RESULT: |
| { |
| ALOG_ASSERT(acquireResult != NULL, "Unexpected brACQUIRE_RESULT"); |
| const int32_t result = mIn.readInt32(); |
| if (!acquireResult) continue; |
| *acquireResult = result ? NO_ERROR : INVALID_OPERATION; |
| } |
| goto finish; |
| |
| case BR_REPLY: |
| { |
| binder_transaction_data tr; |
| err = mIn.read(&tr, sizeof(tr)); |
| ALOG_ASSERT(err == NO_ERROR, "Not enough command data for brREPLY"); |
| if (err != NO_ERROR) goto finish; |
| |
| if (reply) { |
| if ((tr.flags & TF_STATUS_CODE) == 0) { |
| reply->ipcSetDataReference( |
| reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), |
| tr.data_size, |
| reinterpret_cast<const size_t*>(tr.data.ptr.offsets), |
| tr.offsets_size/sizeof(size_t), |
| freeBuffer, this); |
| } else { |
| err = *static_cast<const status_t*>(tr.data.ptr.buffer); |
| freeBuffer(NULL, |
| reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), |
| tr.data_size, |
| reinterpret_cast<const size_t*>(tr.data.ptr.offsets), |
| tr.offsets_size/sizeof(size_t), this); |
| } |
| } else { |
| freeBuffer(NULL, |
| reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), |
| tr.data_size, |
| reinterpret_cast<const size_t*>(tr.data.ptr.offsets), |
| tr.offsets_size/sizeof(size_t), this); |
| continue; |
| } |
| } |
| goto finish; |
| |
| default: |
| err = executeCommand(cmd); |
| if (err != NO_ERROR) goto finish; |
| break; |
| } |
| } |
| |
| finish: |
| if (err != NO_ERROR) { |
| if (acquireResult) *acquireResult = err; |
| if (reply) reply->setError(err); |
| mLastError = err; |
| } |
| |
| return err; |
| } |
| |
| status_t IPCThreadState::talkWithDriver(bool doReceive) |
| { |
| if (mProcess->mDriverFD <= 0) { |
| return -EBADF; |
| } |
| |
| binder_write_read bwr; |
| |
| // Is the read buffer empty? |
| const bool needRead = mIn.dataPosition() >= mIn.dataSize(); |
| |
| // We don't want to write anything if we are still reading |
| // from data left in the input buffer and the caller |
| // has requested to read the next data. |
| const size_t outAvail = (!doReceive || needRead) ? mOut.dataSize() : 0; |
| |
| bwr.write_size = outAvail; |
| bwr.write_buffer = (long unsigned int)mOut.data(); |
| |
| // This is what we'll read. |
| if (doReceive && needRead) { |
| bwr.read_size = mIn.dataCapacity(); |
| bwr.read_buffer = (long unsigned int)mIn.data(); |
| } else { |
| bwr.read_size = 0; |
| bwr.read_buffer = 0; |
| } |
| |
| IF_LOG_COMMANDS() { |
| TextOutput::Bundle _b(alog); |
| if (outAvail != 0) { |
| alog << "Sending commands to driver: " << indent; |
| const void* cmds = (const void*)bwr.write_buffer; |
| const void* end = ((const uint8_t*)cmds)+bwr.write_size; |
| alog << HexDump(cmds, bwr.write_size) << endl; |
| while (cmds < end) cmds = printCommand(alog, cmds); |
| alog << dedent; |
| } |
| alog << "Size of receive buffer: " << bwr.read_size |
| << ", needRead: " << needRead << ", doReceive: " << doReceive << endl; |
| } |
| |
| // Return immediately if there is nothing to do. |
| if ((bwr.write_size == 0) && (bwr.read_size == 0)) return NO_ERROR; |
| |
| bwr.write_consumed = 0; |
| bwr.read_consumed = 0; |
| status_t err; |
| do { |
| IF_LOG_COMMANDS() { |
| alog << "About to read/write, write size = " << mOut.dataSize() << endl; |
| } |
| #if defined(HAVE_ANDROID_OS) |
| if (ioctl(mProcess->mDriverFD, BINDER_WRITE_READ, &bwr) >= 0) |
| err = NO_ERROR; |
| else |
| err = -errno; |
| #else |
| err = INVALID_OPERATION; |
| #endif |
| if (mProcess->mDriverFD <= 0) { |
| err = -EBADF; |
| } |
| IF_LOG_COMMANDS() { |
| alog << "Finished read/write, write size = " << mOut.dataSize() << endl; |
| } |
| } while (err == -EINTR); |
| |
| IF_LOG_COMMANDS() { |
| alog << "Our err: " << (void*)err << ", write consumed: " |
| << bwr.write_consumed << " (of " << mOut.dataSize() |
| << "), read consumed: " << bwr.read_consumed << endl; |
| } |
| |
| if (err >= NO_ERROR) { |
| if (bwr.write_consumed > 0) { |
| if (bwr.write_consumed < (ssize_t)mOut.dataSize()) |
| mOut.remove(0, bwr.write_consumed); |
| else |
| mOut.setDataSize(0); |
| } |
| if (bwr.read_consumed > 0) { |
| mIn.setDataSize(bwr.read_consumed); |
| mIn.setDataPosition(0); |
| } |
| IF_LOG_COMMANDS() { |
| TextOutput::Bundle _b(alog); |
| alog << "Remaining data size: " << mOut.dataSize() << endl; |
| alog << "Received commands from driver: " << indent; |
| const void* cmds = mIn.data(); |
| const void* end = mIn.data() + mIn.dataSize(); |
| alog << HexDump(cmds, mIn.dataSize()) << endl; |
| while (cmds < end) cmds = printReturnCommand(alog, cmds); |
| alog << dedent; |
| } |
| return NO_ERROR; |
| } |
| |
| return err; |
| } |
| |
| status_t IPCThreadState::writeTransactionData(int32_t cmd, uint32_t binderFlags, |
| int32_t handle, uint32_t code, const Parcel& data, status_t* statusBuffer) |
| { |
| binder_transaction_data tr; |
| |
| tr.target.handle = handle; |
| tr.code = code; |
| tr.flags = binderFlags; |
| tr.cookie = 0; |
| tr.sender_pid = 0; |
| tr.sender_euid = 0; |
| |
| const status_t err = data.errorCheck(); |
| if (err == NO_ERROR) { |
| tr.data_size = data.ipcDataSize(); |
| tr.data.ptr.buffer = data.ipcData(); |
| tr.offsets_size = data.ipcObjectsCount()*sizeof(size_t); |
| tr.data.ptr.offsets = data.ipcObjects(); |
| } else if (statusBuffer) { |
| tr.flags |= TF_STATUS_CODE; |
| *statusBuffer = err; |
| tr.data_size = sizeof(status_t); |
| tr.data.ptr.buffer = statusBuffer; |
| tr.offsets_size = 0; |
| tr.data.ptr.offsets = NULL; |
| } else { |
| return (mLastError = err); |
| } |
| |
| mOut.writeInt32(cmd); |
| mOut.write(&tr, sizeof(tr)); |
| |
| return NO_ERROR; |
| } |
| |
| sp<BBinder> the_context_object; |
| |
| void setTheContextObject(sp<BBinder> obj) |
| { |
| the_context_object = obj; |
| } |
| |
| status_t IPCThreadState::executeCommand(int32_t cmd) |
| { |
| BBinder* obj; |
| RefBase::weakref_type* refs; |
| status_t result = NO_ERROR; |
| |
| switch (cmd) { |
| case BR_ERROR: |
| result = mIn.readInt32(); |
| break; |
| |
| case BR_OK: |
| break; |
| |
| case BR_ACQUIRE: |
| refs = (RefBase::weakref_type*)mIn.readInt32(); |
| obj = (BBinder*)mIn.readInt32(); |
| ALOG_ASSERT(refs->refBase() == obj, |
| "BR_ACQUIRE: object %p does not match cookie %p (expected %p)", |
| refs, obj, refs->refBase()); |
| obj->incStrong(mProcess.get()); |
| IF_LOG_REMOTEREFS() { |
| LOG_REMOTEREFS("BR_ACQUIRE from driver on %p", obj); |
| obj->printRefs(); |
| } |
| mOut.writeInt32(BC_ACQUIRE_DONE); |
| mOut.writeInt32((int32_t)refs); |
| mOut.writeInt32((int32_t)obj); |
| break; |
| |
| case BR_RELEASE: |
| refs = (RefBase::weakref_type*)mIn.readInt32(); |
| obj = (BBinder*)mIn.readInt32(); |
| ALOG_ASSERT(refs->refBase() == obj, |
| "BR_RELEASE: object %p does not match cookie %p (expected %p)", |
| refs, obj, refs->refBase()); |
| IF_LOG_REMOTEREFS() { |
| LOG_REMOTEREFS("BR_RELEASE from driver on %p", obj); |
| obj->printRefs(); |
| } |
| mPendingStrongDerefs.push(obj); |
| break; |
| |
| case BR_INCREFS: |
| refs = (RefBase::weakref_type*)mIn.readInt32(); |
| obj = (BBinder*)mIn.readInt32(); |
| refs->incWeak(mProcess.get()); |
| mOut.writeInt32(BC_INCREFS_DONE); |
| mOut.writeInt32((int32_t)refs); |
| mOut.writeInt32((int32_t)obj); |
| break; |
| |
| case BR_DECREFS: |
| refs = (RefBase::weakref_type*)mIn.readInt32(); |
| obj = (BBinder*)mIn.readInt32(); |
| // NOTE: This assertion is not valid, because the object may no |
| // longer exist (thus the (BBinder*)cast above resulting in a different |
| // memory address). |
| //ALOG_ASSERT(refs->refBase() == obj, |
| // "BR_DECREFS: object %p does not match cookie %p (expected %p)", |
| // refs, obj, refs->refBase()); |
| mPendingWeakDerefs.push(refs); |
| break; |
| |
| case BR_ATTEMPT_ACQUIRE: |
| refs = (RefBase::weakref_type*)mIn.readInt32(); |
| obj = (BBinder*)mIn.readInt32(); |
| |
| { |
| const bool success = refs->attemptIncStrong(mProcess.get()); |
| ALOG_ASSERT(success && refs->refBase() == obj, |
| "BR_ATTEMPT_ACQUIRE: object %p does not match cookie %p (expected %p)", |
| refs, obj, refs->refBase()); |
| |
| mOut.writeInt32(BC_ACQUIRE_RESULT); |
| mOut.writeInt32((int32_t)success); |
| } |
| break; |
| |
| case BR_TRANSACTION: |
| { |
| binder_transaction_data tr; |
| result = mIn.read(&tr, sizeof(tr)); |
| ALOG_ASSERT(result == NO_ERROR, |
| "Not enough command data for brTRANSACTION"); |
| if (result != NO_ERROR) break; |
| |
| Parcel buffer; |
| buffer.ipcSetDataReference( |
| reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer), |
| tr.data_size, |
| reinterpret_cast<const size_t*>(tr.data.ptr.offsets), |
| tr.offsets_size/sizeof(size_t), freeBuffer, this); |
| |
| const pid_t origPid = mCallingPid; |
| const uid_t origUid = mCallingUid; |
| |
| mCallingPid = tr.sender_pid; |
| mCallingUid = tr.sender_euid; |
| |
| int curPrio = getpriority(PRIO_PROCESS, mMyThreadId); |
| if (gDisableBackgroundScheduling) { |
| if (curPrio > ANDROID_PRIORITY_NORMAL) { |
| // We have inherited a reduced priority from the caller, but do not |
| // want to run in that state in this process. The driver set our |
| // priority already (though not our scheduling class), so bounce |
| // it back to the default before invoking the transaction. |
| setpriority(PRIO_PROCESS, mMyThreadId, ANDROID_PRIORITY_NORMAL); |
| } |
| } else { |
| if (curPrio >= ANDROID_PRIORITY_BACKGROUND) { |
| // We want to use the inherited priority from the caller. |
| // Ensure this thread is in the background scheduling class, |
| // since the driver won't modify scheduling classes for us. |
| // The scheduling group is reset to default by the caller |
| // once this method returns after the transaction is complete. |
| set_sched_policy(mMyThreadId, SP_BACKGROUND); |
| } |
| } |
| |
| //ALOGI(">>>> TRANSACT from pid %d uid %d\n", mCallingPid, mCallingUid); |
| |
| Parcel reply; |
| IF_LOG_TRANSACTIONS() { |
| TextOutput::Bundle _b(alog); |
| alog << "BR_TRANSACTION thr " << (void*)pthread_self() |
| << " / obj " << tr.target.ptr << " / code " |
| << TypeCode(tr.code) << ": " << indent << buffer |
| << dedent << endl |
| << "Data addr = " |
| << reinterpret_cast<const uint8_t*>(tr.data.ptr.buffer) |
| << ", offsets addr=" |
| << reinterpret_cast<const size_t*>(tr.data.ptr.offsets) << endl; |
| } |
| if (tr.target.ptr) { |
| sp<BBinder> b((BBinder*)tr.cookie); |
| const status_t error = b->transact(tr.code, buffer, &reply, tr.flags); |
| if (error < NO_ERROR) reply.setError(error); |
| |
| } else { |
| const status_t error = the_context_object->transact(tr.code, buffer, &reply, tr.flags); |
| if (error < NO_ERROR) reply.setError(error); |
| } |
| |
| //ALOGI("<<<< TRANSACT from pid %d restore pid %d uid %d\n", |
| // mCallingPid, origPid, origUid); |
| |
| if ((tr.flags & TF_ONE_WAY) == 0) { |
| LOG_ONEWAY("Sending reply to %d!", mCallingPid); |
| sendReply(reply, 0); |
| } else { |
| LOG_ONEWAY("NOT sending reply to %d!", mCallingPid); |
| } |
| |
| mCallingPid = origPid; |
| mCallingUid = origUid; |
| |
| IF_LOG_TRANSACTIONS() { |
| TextOutput::Bundle _b(alog); |
| alog << "BC_REPLY thr " << (void*)pthread_self() << " / obj " |
| << tr.target.ptr << ": " << indent << reply << dedent << endl; |
| } |
| |
| } |
| break; |
| |
| case BR_DEAD_BINDER: |
| { |
| BpBinder *proxy = (BpBinder*)mIn.readInt32(); |
| proxy->sendObituary(); |
| mOut.writeInt32(BC_DEAD_BINDER_DONE); |
| mOut.writeInt32((int32_t)proxy); |
| } break; |
| |
| case BR_CLEAR_DEATH_NOTIFICATION_DONE: |
| { |
| BpBinder *proxy = (BpBinder*)mIn.readInt32(); |
| proxy->getWeakRefs()->decWeak(proxy); |
| } break; |
| |
| case BR_FINISHED: |
| result = TIMED_OUT; |
| break; |
| |
| case BR_NOOP: |
| break; |
| |
| case BR_SPAWN_LOOPER: |
| mProcess->spawnPooledThread(false); |
| break; |
| |
| default: |
| printf("*** BAD COMMAND %d received from Binder driver\n", cmd); |
| result = UNKNOWN_ERROR; |
| break; |
| } |
| |
| if (result != NO_ERROR) { |
| mLastError = result; |
| } |
| |
| return result; |
| } |
| |
| void IPCThreadState::threadDestructor(void *st) |
| { |
| IPCThreadState* const self = static_cast<IPCThreadState*>(st); |
| if (self) { |
| self->flushCommands(); |
| #if defined(HAVE_ANDROID_OS) |
| if (self->mProcess->mDriverFD > 0) { |
| ioctl(self->mProcess->mDriverFD, BINDER_THREAD_EXIT, 0); |
| } |
| #endif |
| delete self; |
| } |
| } |
| |
| |
| void IPCThreadState::freeBuffer(Parcel* parcel, const uint8_t* data, size_t dataSize, |
| const size_t* objects, size_t objectsSize, |
| void* cookie) |
| { |
| //ALOGI("Freeing parcel %p", &parcel); |
| IF_LOG_COMMANDS() { |
| alog << "Writing BC_FREE_BUFFER for " << data << endl; |
| } |
| ALOG_ASSERT(data != NULL, "Called with NULL data"); |
| if (parcel != NULL) parcel->closeFileDescriptors(); |
| IPCThreadState* state = self(); |
| state->mOut.writeInt32(BC_FREE_BUFFER); |
| state->mOut.writeInt32((int32_t)data); |
| } |
| |
| }; // namespace android |
