1 /* 2 * Copyright (C) 2013 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 "Drm" 19 20 #include <dlfcn.h> 21 #include <media/stagefright/foundation/ADebug.h> 22 #include <mediadrm/SharedLibrary.h> 23 #include <utils/Log.h> 24 25 namespace android { 26 27 SharedLibrary::SharedLibrary(const String8 &path) { 28 mLibHandle = dlopen(path.string(), RTLD_NOW); 29 } 30 31 SharedLibrary::~SharedLibrary() { 32 if (mLibHandle != NULL) { 33 dlclose(mLibHandle); 34 mLibHandle = NULL; 35 } 36 } 37 38 bool SharedLibrary::operator!() const { 39 return mLibHandle == NULL; 40 } 41 42 void *SharedLibrary::lookup(const char *symbol) const { 43 if (!mLibHandle) { 44 return NULL; 45 } 46 // Clear last error before we load the symbol again, 47 // in case the caller didn't retrieve it. 48 (void)dlerror(); 49 return dlsym(mLibHandle, symbol); 50 } 51 52 const char *SharedLibrary::lastError() const { 53 const char *error = dlerror(); 54 return error ? error : "No errors or unknown error"; 55 } 56 57 }; 58
