1 /* 2 * Copyright (C) 2016 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 "plugin.h" 18 19 #include <dlfcn.h> 20 21 #include "android-base/stringprintf.h" 22 23 #include "base/logging.h" 24 25 namespace art { 26 27 using android::base::StringPrintf; 28 29 const char* PLUGIN_INITIALIZATION_FUNCTION_NAME = "ArtPlugin_Initialize"; 30 const char* PLUGIN_DEINITIALIZATION_FUNCTION_NAME = "ArtPlugin_Deinitialize"; 31 32 Plugin::Plugin(const Plugin& other) : library_(other.library_), dlopen_handle_(nullptr) { 33 if (other.IsLoaded()) { 34 std::string err; 35 Load(&err); 36 } 37 } 38 39 bool Plugin::Load(/*out*/std::string* error_msg) { 40 DCHECK(!IsLoaded()); 41 void* res = dlopen(library_.c_str(), RTLD_LAZY); 42 if (res == nullptr) { 43 *error_msg = StringPrintf("dlopen failed: %s", dlerror()); 44 return false; 45 } 46 // Get the initializer function 47 PluginInitializationFunction init = reinterpret_cast<PluginInitializationFunction>( 48 dlsym(res, PLUGIN_INITIALIZATION_FUNCTION_NAME)); 49 if (init != nullptr) { 50 if (!init()) { 51 dlclose(res); 52 *error_msg = StringPrintf("Initialization of plugin failed"); 53 return false; 54 } 55 } else { 56 LOG(WARNING) << this << " does not include an initialization function"; 57 } 58 dlopen_handle_ = res; 59 return true; 60 } 61 62 bool Plugin::Unload() { 63 DCHECK(IsLoaded()); 64 bool ret = true; 65 void* handle = dlopen_handle_; 66 PluginDeinitializationFunction deinit = reinterpret_cast<PluginDeinitializationFunction>( 67 dlsym(handle, PLUGIN_DEINITIALIZATION_FUNCTION_NAME)); 68 if (deinit != nullptr) { 69 if (!deinit()) { 70 LOG(WARNING) << this << " failed deinitialization"; 71 ret = false; 72 } 73 } else { 74 LOG(WARNING) << this << " does not include a deinitialization function"; 75 } 76 dlopen_handle_ = nullptr; 77 if (dlclose(handle) != 0) { 78 LOG(ERROR) << this << " failed to dlclose: " << dlerror(); 79 ret = false; 80 } 81 return ret; 82 } 83 84 std::ostream& operator<<(std::ostream &os, const Plugin* m) { 85 return os << *m; 86 } 87 88 std::ostream& operator<<(std::ostream &os, Plugin const& m) { 89 return os << "Plugin { library=\"" << m.library_ << "\", handle=" << m.dlopen_handle_ << " }"; 90 } 91 92 } // namespace art 93
