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 #include "linker.h" 17 18 #include <android/dlext.h> 19 #include <dlfcn.h> 20 21 #define LOG_TAG "vndksupport" 22 #include <log/log.h> 23 24 extern struct android_namespace_t* android_get_exported_namespace(const char*); 25 26 static const char* namespace_name = NULL; 27 28 static struct android_namespace_t* get_vendor_namespace() { 29 const char* namespace_names[] = {"sphal", "default", NULL}; 30 static struct android_namespace_t* vendor_namespace = NULL; 31 if (vendor_namespace == NULL) { 32 int name_idx = 0; 33 while (namespace_names[name_idx] != NULL) { 34 vendor_namespace = android_get_exported_namespace(namespace_names[name_idx]); 35 if (vendor_namespace != NULL) { 36 namespace_name = namespace_names[name_idx]; 37 break; 38 } 39 name_idx++; 40 } 41 } 42 return vendor_namespace; 43 } 44 45 void* android_load_sphal_library(const char* name, int flag) { 46 struct android_namespace_t* vendor_namespace = get_vendor_namespace(); 47 if (vendor_namespace != NULL) { 48 const android_dlextinfo dlextinfo = { 49 .flags = ANDROID_DLEXT_USE_NAMESPACE, .library_namespace = vendor_namespace, 50 }; 51 void* handle = android_dlopen_ext(name, flag, &dlextinfo); 52 if (!handle) { 53 ALOGE("Could not load %s from %s namespace: %s.", name, namespace_name, dlerror()); 54 } 55 return handle; 56 } else { 57 ALOGD("Loading %s from current namespace instead of sphal namespace.", name); 58 return dlopen(name, flag); 59 } 60 } 61 62 int android_unload_sphal_library(void* handle) { 63 return dlclose(handle); 64 } 65
