1 /* 2 * Copyright (C) 2019 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_NDEBUG 0 18 #define LOG_TAG "android.hardware.cas (at) 1.1-SharedLibrary" 19 20 #include "SharedLibrary.h" 21 #include <dlfcn.h> 22 #include <media/stagefright/foundation/ADebug.h> 23 #include <utils/Log.h> 24 25 namespace android { 26 namespace hardware { 27 namespace cas { 28 namespace V1_1 { 29 namespace implementation { 30 31 SharedLibrary::SharedLibrary(const String8& path) { 32 mLibHandle = dlopen(path.string(), RTLD_NOW); 33 } 34 35 SharedLibrary::~SharedLibrary() { 36 if (mLibHandle != NULL) { 37 dlclose(mLibHandle); 38 mLibHandle = NULL; 39 } 40 } 41 42 bool SharedLibrary::operator!() const { 43 return mLibHandle == NULL; 44 } 45 46 void* SharedLibrary::lookup(const char* symbol) const { 47 if (!mLibHandle) { 48 return NULL; 49 } 50 // Clear last error before we load the symbol again, 51 // in case the caller didn't retrieve it. 52 (void)dlerror(); 53 return dlsym(mLibHandle, symbol); 54 } 55 56 const char* SharedLibrary::lastError() const { 57 const char* error = dlerror(); 58 return error ? error : "No errors or unknown error"; 59 } 60 61 } // namespace implementation 62 } // namespace V1_1 63 } // namespace cas 64 } // namespace hardware 65 } // namespace android 66
