blob: 7d86f1d5dc37aed852d56002ac290476b5d7d2a4 [file] [log] [blame]
Alex Light185d1342016-08-11 10:48:03 -07001/*
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>
Andreas Gampe46ee31b2016-12-14 10:11:49 -080020
21#include "android-base/stringprintf.h"
22
Alex Light185d1342016-08-11 10:48:03 -070023namespace art {
24
Andreas Gampe46ee31b2016-12-14 10:11:49 -080025using android::base::StringPrintf;
26
Alex Light185d1342016-08-11 10:48:03 -070027const char* PLUGIN_INITIALIZATION_FUNCTION_NAME = "ArtPlugin_Initialize";
28const char* PLUGIN_DEINITIALIZATION_FUNCTION_NAME = "ArtPlugin_Deinitialize";
29
30Plugin::Plugin(const Plugin& other) : library_(other.library_), dlopen_handle_(nullptr) {
31 if (other.IsLoaded()) {
32 std::string err;
33 Load(&err);
34 }
35}
36
37bool Plugin::Load(/*out*/std::string* error_msg) {
38 DCHECK(!IsLoaded());
39 void* res = dlopen(library_.c_str(), RTLD_LAZY);
40 if (res == nullptr) {
41 *error_msg = StringPrintf("dlopen failed: %s", dlerror());
42 return false;
43 }
44 // Get the initializer function
45 PluginInitializationFunction init = reinterpret_cast<PluginInitializationFunction>(
46 dlsym(res, PLUGIN_INITIALIZATION_FUNCTION_NAME));
47 if (init != nullptr) {
48 if (!init()) {
49 dlclose(res);
50 *error_msg = StringPrintf("Initialization of plugin failed");
51 return false;
52 }
53 } else {
54 LOG(WARNING) << this << " does not include an initialization function";
55 }
56 dlopen_handle_ = res;
57 return true;
58}
59
60bool Plugin::Unload() {
61 DCHECK(IsLoaded());
62 bool ret = true;
63 void* handle = dlopen_handle_;
64 PluginDeinitializationFunction deinit = reinterpret_cast<PluginDeinitializationFunction>(
65 dlsym(handle, PLUGIN_DEINITIALIZATION_FUNCTION_NAME));
66 if (deinit != nullptr) {
67 if (!deinit()) {
68 LOG(WARNING) << this << " failed deinitialization";
69 ret = false;
70 }
71 } else {
72 LOG(WARNING) << this << " does not include a deinitialization function";
73 }
74 dlopen_handle_ = nullptr;
Alex Light5b803582017-10-16 10:59:26 -070075 // Don't bother to actually dlclose since we are shutting down anyway and there might be small
76 // amounts of processing still being done.
Alex Light185d1342016-08-11 10:48:03 -070077 return ret;
78}
79
80std::ostream& operator<<(std::ostream &os, const Plugin* m) {
81 return os << *m;
82}
83
84std::ostream& operator<<(std::ostream &os, Plugin const& m) {
85 return os << "Plugin { library=\"" << m.library_ << "\", handle=" << m.dlopen_handle_ << " }";
86}
87
88} // namespace art