1 /* 2 * Copyright (C) 2022 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 "android.hardware.cas-SharedLibrary" 18 19 #include "SharedLibrary.h" 20 #include <dlfcn.h> 21 #include <utils/Log.h> 22 23 namespace aidl { 24 namespace android { 25 namespace hardware { 26 namespace cas { 27 SharedLibrary(const String8 & path)28SharedLibrary::SharedLibrary(const String8& path) { 29 mLibHandle = dlopen(path.c_str(), RTLD_NOW); 30 } 31 ~SharedLibrary()32SharedLibrary::~SharedLibrary() { 33 if (mLibHandle != NULL) { 34 dlclose(mLibHandle); 35 mLibHandle = NULL; 36 } 37 } 38 operator !() const39bool SharedLibrary::operator!() const { 40 return mLibHandle == NULL; 41 } 42 lookup(const char * symbol) const43void* SharedLibrary::lookup(const char* symbol) const { 44 if (!mLibHandle) { 45 return NULL; 46 } 47 // Clear last error before we load the symbol again, 48 // in case the caller didn't retrieve it. 49 (void)dlerror(); 50 return dlsym(mLibHandle, symbol); 51 } 52 lastError() const53const char* SharedLibrary::lastError() const { 54 const char* error = dlerror(); 55 return error ? error : "No errors or unknown error"; 56 } 57 58 } // namespace cas 59 } // namespace hardware 60 } // namespace android 61 } // namespace aidl 62