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/*
* Copyright (C) 2016 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 "plugin.h"
#include <dlfcn.h>
#include "android-base/stringprintf.h"
namespace art {
using android::base::StringPrintf;
const char* PLUGIN_INITIALIZATION_FUNCTION_NAME = "ArtPlugin_Initialize";
const char* PLUGIN_DEINITIALIZATION_FUNCTION_NAME = "ArtPlugin_Deinitialize";
Plugin::Plugin(const Plugin& other) : library_(other.library_), dlopen_handle_(nullptr) {
CHECK(!other.IsLoaded()) << "Should not copy loaded plugins.";
}
bool Plugin::Load(/*out*/std::string* error_msg) {
DCHECK(!IsLoaded());
void* res = dlopen(library_.c_str(), RTLD_LAZY);
if (res == nullptr) {
*error_msg = StringPrintf("dlopen failed: %s", dlerror());
return false;
}
// Get the initializer function
PluginInitializationFunction init = reinterpret_cast<PluginInitializationFunction>(
dlsym(res, PLUGIN_INITIALIZATION_FUNCTION_NAME));
if (init != nullptr) {
if (!init()) {
dlclose(res);
*error_msg = StringPrintf("Initialization of plugin failed");
return false;
}
} else {
LOG(WARNING) << this << " does not include an initialization function";
}
dlopen_handle_ = res;
return true;
}
bool Plugin::Unload() {
DCHECK(IsLoaded());
bool ret = true;
void* handle = dlopen_handle_;
PluginDeinitializationFunction deinit = reinterpret_cast<PluginDeinitializationFunction>(
dlsym(handle, PLUGIN_DEINITIALIZATION_FUNCTION_NAME));
if (deinit != nullptr) {
if (!deinit()) {
LOG(WARNING) << this << " failed deinitialization";
ret = false;
}
} else {
LOG(WARNING) << this << " does not include a deinitialization function";
}
dlopen_handle_ = nullptr;
// Don't bother to actually dlclose since we are shutting down anyway and there might be small
// amounts of processing still being done.
return ret;
}
std::ostream& operator<<(std::ostream &os, const Plugin* m) {
return os << *m;
}
std::ostream& operator<<(std::ostream &os, Plugin const& m) {
return os << "Plugin { library=\"" << m.library_ << "\", handle=" << m.dlopen_handle_ << " }";
}
} // namespace art
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