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d510d2aeb2
Since DynamicLoader is compiled with -fdata-sections and --gc-sections, unused thread_local variables won't create TLS section in it anymore.
80 lines
2 KiB
C++
80 lines
2 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/ByteString.h>
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#include <AK/Result.h>
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#include <AK/Types.h>
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#include <bits/dlfcn_integration.h>
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#include <dlfcn.h>
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#include <string.h>
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[[gnu::weak]] Result<void, DlErrorMessage> __dlclose(void*) asm("__dlclose");
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[[gnu::weak]] Result<void*, DlErrorMessage> __dlopen(char const*, int) asm("__dlopen");
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[[gnu::weak]] Result<void*, DlErrorMessage> __dlsym(void*, char const*) asm("__dlsym");
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[[gnu::weak]] Result<void, DlErrorMessage> __dladdr(void const*, Dl_info*) asm("__dladdr");
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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(ByteString const& 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(char const* filename, int flags)
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{
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auto result = __dlopen(filename, 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, char const* 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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int dladdr(void const* addr, Dl_info* info)
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{
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auto result = __dladdr(addr, info);
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if (result.is_error()) {
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// FIXME: According to the man page glibc does _not_ make the error
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// available via dlerror(), however we do. Does this break anything?
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store_error(result.error().text);
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return 0;
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}
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return 1;
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}
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