mirror of
https://github.com/RGBCube/serenity
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f40ee1b03f
This implements more of the dlfcn functionality. Most notably: * It's now possible to dlopen() libraries which were already loaded at program startup time. This does not cause those libraries to be loaded twice. * Errors are reported via dlerror() rather than by crashing the program. * Calls to the dl*() functions are thread-safe.
62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
/*
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* Copyright (c) 2021, Gunnar Beutner <gunnar@beutner.name>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/String.h>
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#include <AK/Types.h>
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#include <LibDl/dlfcn.h>
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#include <LibDl/dlfcn_integration.h>
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#include <string.h>
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// FIXME: use thread_local and a String once TLS works
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__thread char* s_dlerror_text = NULL;
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__thread bool s_dlerror_retrieved = false;
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static void store_error(const String& error)
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{
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free(s_dlerror_text);
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s_dlerror_text = strdup(error.characters());
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s_dlerror_retrieved = false;
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}
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int dlclose(void* handle)
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{
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auto result = __dlclose(handle);
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if (result.is_error()) {
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store_error(result.error().text);
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return -1;
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}
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return 0;
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}
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char* dlerror()
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{
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if (s_dlerror_retrieved) {
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free(s_dlerror_text);
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s_dlerror_text = nullptr;
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}
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s_dlerror_retrieved = true;
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return const_cast<char*>(s_dlerror_text);
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}
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void* dlopen(const char* file_name, int flags)
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{
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auto result = __dlopen(file_name, flags);
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if (result.is_error()) {
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store_error(result.error().text);
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return nullptr;
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}
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return result.value();
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}
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void* dlsym(void* handle, const char* symbol_name)
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{
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auto result = __dlsym(handle, symbol_name);
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if (result.is_error()) {
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store_error(result.error().text);
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return nullptr;
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}
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return result.value();
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}
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