| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #include "linker.h" |
| |
| #include <android/dlext.h> |
| #include <dlfcn.h> |
| |
| #define LOG_TAG "vndksupport" |
| #include <log/log.h> |
| |
| __attribute__((weak)) extern struct android_namespace_t* android_get_exported_namespace(const char*); |
| __attribute__((weak)) extern void* android_dlopen_ext(const char*, int, const android_dlextinfo*); |
| |
| static const char* namespace_name = NULL; |
| |
| static struct android_namespace_t* get_vendor_namespace() { |
| const char* namespace_names[] = {"sphal", "default", NULL}; |
| static struct android_namespace_t* vendor_namespace = NULL; |
| if (vendor_namespace == NULL) { |
| int name_idx = 0; |
| while (namespace_names[name_idx] != NULL) { |
| if (android_get_exported_namespace != NULL) { |
| vendor_namespace = android_get_exported_namespace(namespace_names[name_idx]); |
| } |
| if (vendor_namespace != NULL) { |
| namespace_name = namespace_names[name_idx]; |
| break; |
| } |
| name_idx++; |
| } |
| } |
| return vendor_namespace; |
| } |
| |
| int android_is_in_vendor_process() { |
| if (android_get_exported_namespace == NULL) { |
| ALOGD("android_get_exported_namespace() not available. Assuming system process."); |
| return 0; |
| } |
| |
| // In vendor process, 'vndk' namespace is not visible, whereas in system |
| // process, it is. |
| return android_get_exported_namespace("vndk") == NULL; |
| } |
| |
| void* android_load_sphal_library(const char* name, int flag) { |
| struct android_namespace_t* vendor_namespace = get_vendor_namespace(); |
| if (vendor_namespace != NULL) { |
| const android_dlextinfo dlextinfo = { |
| .flags = ANDROID_DLEXT_USE_NAMESPACE, .library_namespace = vendor_namespace, |
| }; |
| void* handle = NULL; |
| if (android_dlopen_ext != NULL) { |
| handle = android_dlopen_ext(name, flag, &dlextinfo); |
| } |
| if (!handle) { |
| ALOGE("Could not load %s from %s namespace: %s.", name, namespace_name, dlerror()); |
| } |
| return handle; |
| } else { |
| ALOGD("Loading %s from current namespace instead of sphal namespace.", name); |
| return dlopen(name, flag); |
| } |
| } |
| |
| int android_unload_sphal_library(void* handle) { |
| return dlclose(handle); |
| } |