83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
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/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "DlHelp.h"
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#include <stdbool.h>
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#ifdef WIN32_LEAN_AND_MEAN
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#include <stdio.h>
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#include <windows.h>
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#else
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#include <dlfcn.h>
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#endif
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DlLibrary DlOpenLibrary(const char* filename) {
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#ifdef _WIN32
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return LoadLibrary(filename);
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#else
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// Load with RTLD_NODELETE in order to ensure that libart.so is not unmapped when it is closed.
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// This is due to the fact that it is possible that some threads might have yet to finish
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// exiting even after JNI_DeleteJavaVM returns, which can lead to segfaults if the library is
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// unloaded.
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return dlopen(filename, RTLD_NOW | RTLD_NODELETE);
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#endif
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}
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bool DlCloseLibrary(DlLibrary library) {
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#ifdef _WIN32
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return (FreeLibrary(library) == TRUE);
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#else
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return (dlclose(library) == 0);
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#endif
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}
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DlSymbol DlGetSymbol(DlLibrary handle, const char* symbol) {
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#ifdef _WIN32
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return (DlSymbol) GetProcAddress(handle, symbol);
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#else
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return dlsym(handle, symbol);
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#endif
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}
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const char* DlGetError() {
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#ifdef _WIN32
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static char buffer[256];
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DWORD cause = GetLastError();
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DWORD flags = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS;
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DWORD length = FormatMessageA(flags, NULL, cause, 0, buffer, sizeof(buffer), NULL);
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if (length == 0) {
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snprintf(buffer, sizeof(buffer),
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"Error %lu while retrieving message for error %lu",
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GetLastError(), cause);
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length = strlen(buffer);
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}
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// Trim trailing whitespace.
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for (DWORD i = length - 1; i > 0; --i) {
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if (!isspace(buffer[i])) {
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break;
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}
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buffer[i] = '\0';
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}
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return buffer;
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#else
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return dlerror();
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#endif
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}
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