| /* |
| * Copyright (C) 2020 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 "DlHelp.h" |
| |
| #include <stdbool.h> |
| |
| #ifdef WIN32_LEAN_AND_MEAN |
| #include <stdio.h> |
| #include <windows.h> |
| #else |
| #include <dlfcn.h> |
| #endif |
| |
| DlLibrary DlOpenLibrary(const char* filename) { |
| #ifdef _WIN32 |
| return LoadLibrary(filename); |
| #else |
| // Load with RTLD_NODELETE in order to ensure that libart.so is not unmapped when it is closed. |
| // This is due to the fact that it is possible that some threads might have yet to finish |
| // exiting even after JNI_DeleteJavaVM returns, which can lead to segfaults if the library is |
| // unloaded. |
| return dlopen(filename, RTLD_NOW | RTLD_NODELETE); |
| #endif |
| } |
| |
| bool DlCloseLibrary(DlLibrary library) { |
| #ifdef _WIN32 |
| return (FreeLibrary(library) == TRUE); |
| #else |
| return (dlclose(library) == 0); |
| #endif |
| } |
| |
| DlSymbol DlGetSymbol(DlLibrary handle, const char* symbol) { |
| #ifdef _WIN32 |
| return (DlSymbol) GetProcAddress(handle, symbol); |
| #else |
| return dlsym(handle, symbol); |
| #endif |
| } |
| |
| const char* DlGetError() { |
| #ifdef _WIN32 |
| static char buffer[256]; |
| |
| DWORD cause = GetLastError(); |
| DWORD flags = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS; |
| DWORD length = FormatMessageA(flags, NULL, cause, 0, buffer, sizeof(buffer), NULL); |
| if (length == 0) { |
| snprintf(buffer, sizeof(buffer), |
| "Error %lu while retrieving message for error %lu", |
| GetLastError(), cause); |
| length = strlen(buffer); |
| } |
| |
| // Trim trailing whitespace. |
| for (DWORD i = length - 1; i > 0; --i) { |
| if (!isspace(buffer[i])) { |
| break; |
| } |
| buffer[i] = '\0'; |
| } |
| |
| return buffer; |
| #else |
| return dlerror(); |
| #endif |
| } |