1 /** 2 * Copyright (c) 2021-2022 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 "os/library_loader.h" 17 18 #include <dlfcn.h> 19 #include <iosfwd> 20 #include <string> 21 #include <string_view> 22 23 #include "os/error.h" 24 #include "utils/expected.h" 25 26 namespace panda::os::library_loader { 27 ResolveSymbol(const LibraryHandle & handle,std::string_view name)28Expected<void *, Error> ResolveSymbol(const LibraryHandle &handle, std::string_view name) 29 { 30 void *p = dlsym(handle.GetNativeHandle(), name.data()); 31 if (p != nullptr) { 32 return p; 33 } 34 char *msg = dlerror(); 35 return msg != nullptr ? Unexpected(Error(msg)) : Unexpected(Error("no error message")); 36 } 37 CloseHandle(void * handle)38void CloseHandle(void *handle) 39 { 40 if (handle != nullptr) { 41 dlclose(handle); 42 } 43 } 44 } // namespace panda::os::library_loader 45