1 /* 2 * Copyright (C) 2015 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 #include <dlfcn.h> 18 19 static const char* g_local_string = "This string is local to root library"; 20 extern "C" const char* g_private_extern_string; 21 extern "C" const char* g_public_extern_string; 22 23 bool g_dlopened = false; 24 ns_get_local_string()25extern "C" const char* ns_get_local_string() { 26 return g_local_string; 27 } 28 ns_get_private_extern_string()29extern "C" const char* ns_get_private_extern_string() { 30 return g_private_extern_string; 31 } 32 ns_get_public_extern_string()33extern "C" const char* ns_get_public_extern_string() { 34 return g_public_extern_string; 35 } 36 ns_get_dlopened_string()37extern "C" const char* ns_get_dlopened_string() { 38 void* handle = dlopen("libnstest_dlopened.so", RTLD_NOW | RTLD_GLOBAL); 39 if (handle == nullptr) { 40 return nullptr; 41 } 42 43 const char** result = static_cast<const char**>(dlsym(handle, "g_private_dlopened_string")); 44 if (result == nullptr) { 45 return nullptr; 46 } else { 47 g_dlopened = true; 48 } 49 50 return *result; 51 } 52