| /* |
| * Copyright (C) 2016 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 "HidlInternal" |
| |
| #include <hidl/HidlInternal.h> |
| |
| #include <android-base/logging.h> |
| #include <cutils/properties.h> |
| |
| #ifdef LIBHIDL_TARGET_DEBUGGABLE |
| #include <dirent.h> |
| #include <dlfcn.h> |
| #include <regex> |
| #endif |
| |
| namespace android { |
| namespace hardware { |
| namespace details { |
| |
| void logAlwaysFatal(const char *message) { |
| LOG(FATAL) << message; |
| } |
| |
| // ---------------------------------------------------------------------- |
| // HidlInstrumentor implementation. |
| HidlInstrumentor::HidlInstrumentor(const std::string& package, const std::string& interface) |
| : mEnableInstrumentation(false), |
| mInstrumentationLibPackage(package), |
| mInterfaceName(interface) { |
| configureInstrumentation(false); |
| } |
| |
| HidlInstrumentor:: ~HidlInstrumentor() {} |
| |
| void HidlInstrumentor::configureInstrumentation(bool log) { |
| bool enableInstrumentation = property_get_bool( |
| "hal.instrumentation.enable", |
| false); |
| if (enableInstrumentation != mEnableInstrumentation) { |
| mEnableInstrumentation = enableInstrumentation; |
| if (mEnableInstrumentation) { |
| if (log) { |
| LOG(INFO) << "Enable instrumentation."; |
| } |
| registerInstrumentationCallbacks (&mInstrumentationCallbacks); |
| } else { |
| if (log) { |
| LOG(INFO) << "Disable instrumentation."; |
| } |
| mInstrumentationCallbacks.clear(); |
| } |
| } |
| } |
| |
| void HidlInstrumentor::registerInstrumentationCallbacks( |
| std::vector<InstrumentationCallback> *instrumentationCallbacks) { |
| #ifdef LIBHIDL_TARGET_DEBUGGABLE |
| std::vector<std::string> instrumentationLibPaths; |
| char instrumentationLibPath[PROPERTY_VALUE_MAX]; |
| if (property_get("hal.instrumentation.lib.path", |
| instrumentationLibPath, |
| "") > 0) { |
| instrumentationLibPaths.push_back(instrumentationLibPath); |
| } else { |
| instrumentationLibPaths.push_back(HAL_LIBRARY_PATH_SYSTEM); |
| instrumentationLibPaths.push_back(HAL_LIBRARY_PATH_VNDK_SP); |
| instrumentationLibPaths.push_back(HAL_LIBRARY_PATH_VENDOR); |
| instrumentationLibPaths.push_back(HAL_LIBRARY_PATH_ODM); |
| } |
| |
| for (auto path : instrumentationLibPaths) { |
| DIR *dir = opendir(path.c_str()); |
| if (dir == 0) { |
| LOG(WARNING) << path << " does not exist. "; |
| return; |
| } |
| |
| struct dirent *file; |
| while ((file = readdir(dir)) != NULL) { |
| if (!isInstrumentationLib(file)) |
| continue; |
| |
| void *handle = dlopen((path + file->d_name).c_str(), RTLD_NOW); |
| char *error; |
| if (handle == nullptr) { |
| LOG(WARNING) << "couldn't load file: " << file->d_name |
| << " error: " << dlerror(); |
| continue; |
| } |
| |
| dlerror(); /* Clear any existing error */ |
| |
| using cbFun = void (*)( |
| const InstrumentationEvent, |
| const char *, |
| const char *, |
| const char *, |
| const char *, |
| std::vector<void *> *); |
| std::string package = mInstrumentationLibPackage; |
| for (size_t i = 0; i < package.size(); i++) { |
| if (package[i] == '.') { |
| package[i] = '_'; |
| continue; |
| } |
| |
| if (package[i] == '@') { |
| package[i] = '_'; |
| package.insert(i + 1, "V"); |
| continue; |
| } |
| } |
| auto cb = (cbFun)dlsym(handle, ("HIDL_INSTRUMENTATION_FUNCTION_" |
| + package + "_" + mInterfaceName).c_str()); |
| if ((error = dlerror()) != NULL) { |
| LOG(WARNING) |
| << "couldn't find symbol: HIDL_INSTRUMENTATION_FUNCTION_" |
| << package << "_" << mInterfaceName << ", error: " << error; |
| continue; |
| } |
| instrumentationCallbacks->push_back(cb); |
| LOG(INFO) << "Register instrumentation callback from " |
| << file->d_name; |
| } |
| closedir(dir); |
| } |
| #else |
| // No-op for user builds. |
| (void) instrumentationCallbacks; |
| return; |
| #endif |
| } |
| |
| bool HidlInstrumentor::isInstrumentationLib(const dirent *file) { |
| #ifdef LIBHIDL_TARGET_DEBUGGABLE |
| if (file->d_type != DT_REG) return false; |
| std::cmatch cm; |
| std::regex e("^" + mInstrumentationLibPackage + "(.*).profiler.so$"); |
| if (std::regex_match(file->d_name, cm, e)) return true; |
| #else |
| (void) file; |
| #endif |
| return false; |
| } |
| |
| } // namespace details |
| } // namespace hardware |
| } // namespace android |