| /* |
| * Copyright (C) 2014 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 "nativebridge/native_bridge.h" |
| |
| #include <dlfcn.h> |
| #include <stdio.h> |
| #include "utils/Mutex.h" |
| |
| |
| namespace android { |
| |
| static Mutex native_bridge_lock("native bridge lock"); |
| |
| // The symbol name exposed by native-bridge with the type of NativeBridgeCallbacks. |
| static constexpr const char* kNativeBridgeInterfaceSymbol = "NativeBridgeItf"; |
| |
| // The path of the library we are supposed to load. |
| static const char* native_bridge_library_path = nullptr; |
| |
| // Whether a native bridge is available (loaded and ready). |
| static bool available = false; |
| // Whether we have already initialized (or tried to). |
| static bool initialized = false; |
| |
| static NativeBridgeCallbacks* callbacks = nullptr; |
| static const NativeBridgeRuntimeCallbacks* runtime_callbacks = nullptr; |
| |
| void SetupNativeBridge(const char* nb_library_path, |
| const NativeBridgeRuntimeCallbacks* runtime_cbs) { |
| Mutex::Autolock auto_lock(native_bridge_lock); |
| |
| native_bridge_library_path = nb_library_path; |
| runtime_callbacks = runtime_cbs; |
| |
| if (native_bridge_library_path == nullptr) { |
| initialized = true; |
| available = false; |
| } |
| } |
| |
| static bool NativeBridgeInitialize() { |
| Mutex::Autolock auto_lock(native_bridge_lock); |
| |
| if (initialized) { |
| // Somebody did it before. |
| return available; |
| } |
| |
| available = false; |
| |
| void* handle = dlopen(native_bridge_library_path, RTLD_LAZY); |
| if (handle != nullptr) { |
| callbacks = reinterpret_cast<NativeBridgeCallbacks*>(dlsym(handle, |
| kNativeBridgeInterfaceSymbol)); |
| |
| if (callbacks != nullptr) { |
| available = callbacks->initialize(runtime_callbacks); |
| } |
| |
| if (!available) { |
| dlclose(handle); |
| } |
| } |
| |
| initialized = true; |
| |
| return available; |
| } |
| |
| void* NativeBridgeLoadLibrary(const char* libpath, int flag) { |
| if (NativeBridgeInitialize()) { |
| return callbacks->loadLibrary(libpath, flag); |
| } |
| return nullptr; |
| } |
| |
| void* NativeBridgeGetTrampoline(void* handle, const char* name, const char* shorty, |
| uint32_t len) { |
| if (NativeBridgeInitialize()) { |
| return callbacks->getTrampoline(handle, name, shorty, len); |
| } |
| return nullptr; |
| } |
| |
| bool NativeBridgeIsSupported(const char* libpath) { |
| if (NativeBridgeInitialize()) { |
| return callbacks->isSupported(libpath); |
| } |
| return false; |
| } |
| |
| }; // namespace android |