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91 lines
2.8 KiB
91 lines
2.8 KiB
4 months ago
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "plugin.h"
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#include <dlfcn.h>
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#include "android-base/stringprintf.h"
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#include "base/locks.h"
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#include "base/mutex.h"
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#include "thread-current-inl.h"
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namespace art {
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using android::base::StringPrintf;
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const char* PLUGIN_INITIALIZATION_FUNCTION_NAME = "ArtPlugin_Initialize";
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const char* PLUGIN_DEINITIALIZATION_FUNCTION_NAME = "ArtPlugin_Deinitialize";
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Plugin::Plugin(const Plugin& other) : library_(other.library_), dlopen_handle_(nullptr) {
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CHECK(!other.IsLoaded()) << "Should not copy loaded plugins.";
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}
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bool Plugin::Load(/*out*/std::string* error_msg) {
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Locks::mutator_lock_->AssertNotHeld(Thread::Current());
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DCHECK(!IsLoaded());
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void* res = dlopen(library_.c_str(), RTLD_LAZY);
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if (res == nullptr) {
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*error_msg = StringPrintf("dlopen failed: %s", dlerror());
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return false;
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}
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// Get the initializer function
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PluginInitializationFunction init = reinterpret_cast<PluginInitializationFunction>(
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dlsym(res, PLUGIN_INITIALIZATION_FUNCTION_NAME));
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if (init != nullptr) {
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if (!init()) {
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dlclose(res);
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*error_msg = StringPrintf("Initialization of plugin failed");
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return false;
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}
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} else {
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LOG(WARNING) << this << " does not include an initialization function";
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}
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dlopen_handle_ = res;
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return true;
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}
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bool Plugin::Unload() {
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Locks::mutator_lock_->AssertNotHeld(Thread::Current());
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DCHECK(IsLoaded());
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bool ret = true;
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void* handle = dlopen_handle_;
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PluginDeinitializationFunction deinit = reinterpret_cast<PluginDeinitializationFunction>(
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dlsym(handle, PLUGIN_DEINITIALIZATION_FUNCTION_NAME));
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if (deinit != nullptr) {
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if (!deinit()) {
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LOG(WARNING) << this << " failed deinitialization";
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ret = false;
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}
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} else {
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LOG(WARNING) << this << " does not include a deinitialization function";
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}
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dlopen_handle_ = nullptr;
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// Don't bother to actually dlclose since we are shutting down anyway and there might be small
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// amounts of processing still being done.
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return ret;
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}
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std::ostream& operator<<(std::ostream &os, const Plugin* m) {
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return os << *m;
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}
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std::ostream& operator<<(std::ostream &os, Plugin const& m) {
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return os << "Plugin { library=\"" << m.library_ << "\", handle=" << m.dlopen_handle_ << " }";
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}
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} // namespace art
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