1 /* 2 * Copyright (C) 2017 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 18 #include "SharedLibrary.h" 19 20 #include <dlfcn.h> 21 22 namespace android { 23 namespace hardware { 24 namespace drm { 25 namespace V1_0 { 26 namespace helper { 27 28 SharedLibrary::SharedLibrary(const String8& path) { 29 mLibHandle = dlopen(path.string(), RTLD_NOW); 30 } 31 32 SharedLibrary::~SharedLibrary() { 33 if (mLibHandle != NULL) { 34 dlclose(mLibHandle); 35 mLibHandle = NULL; 36 } 37 } 38 39 bool SharedLibrary::operator!() const { 40 return mLibHandle == NULL; 41 } 42 43 void* SharedLibrary::lookup(const char* symbol) const { 44 if (!mLibHandle) { 45 return NULL; 46 } 47 48 // Clear last error before we load the symbol again, 49 // in case the caller didn't retrieve it. 50 (void)dlerror(); 51 return dlsym(mLibHandle, symbol); 52 } 53 54 const char* SharedLibrary::lastError() const { 55 const char* error = dlerror(); 56 return error ? error : "No errors or unknown error"; 57 } 58 59 } 60 } 61 } 62 } 63 } // namespace android 64
