1 /*
2 * Copyright (c) 2024-2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "library_loader.h"
17 #include "power_log.h"
18
19 namespace OHOS {
20 namespace PowerMgr {
21 static constexpr uint32_t FAILURE_RETRY_TIMES = 3;
22
LibraryLoader(const std::string & libPath,int32_t flags)23 LibraryLoader::LibraryLoader(const std::string& libPath, int32_t flags) : libPath_(libPath)
24 {
25 for (uint32_t i = 0; i < FAILURE_RETRY_TIMES; ++i) {
26 libHandle_ = dlopen(libPath.c_str(), flags);
27 if (libHandle_ != nullptr) {
28 return;
29 }
30 POWER_HILOGE(COMP_SVC, "Failed to dlopen %{public}s, reason: %{public}s, try again(%{public}u)",
31 libPath_.c_str(), dlerror(), i + 1);
32 }
33 }
34
~LibraryLoader()35 LibraryLoader::~LibraryLoader() noexcept
36 {
37 if (libHandle_ == nullptr) {
38 return;
39 }
40 for (uint32_t i = 0; i < FAILURE_RETRY_TIMES; ++i) {
41 int32_t ret = dlclose(libHandle_);
42 if (ret == 0) {
43 break;
44 }
45 POWER_HILOGE(COMP_SVC, "Failed to dlclose %{public}s, reason: %{public}s, try again(%{public}u)",
46 libPath_.c_str(), dlerror(), i + 1);
47 }
48 libHandle_ = nullptr;
49 }
50
LoadInterface(const char * symbolName)51 void* LibraryLoader::LoadInterface(const char* symbolName)
52 {
53 if (libHandle_ == nullptr || symbolName == nullptr) {
54 POWER_HILOGE(COMP_SVC, "library handle or symbol name is invalid");
55 return nullptr;
56 }
57 for (uint32_t i = 0; i < FAILURE_RETRY_TIMES; ++i) {
58 void* funcPtr = dlsym(libHandle_, symbolName);
59 if (funcPtr != nullptr) {
60 return funcPtr;
61 }
62 POWER_HILOGE(COMP_SVC, "Failed to dlsym %{public}s, reason: %{public}s, try again(%{public}u)", symbolName,
63 dlerror(), i + 1);
64 }
65 return nullptr;
66 }
67
68 } // namespace PowerMgr
69 } // namespace OHOS