40 lines
1.1 KiB
C++
40 lines
1.1 KiB
C++
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// SPDX-FileCopyrightText: Matteo Settenvini <matteo.settenvini@montecristosoftware.eu>
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// SPDX-License-Identifier: GPL-3.0-or-later
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#include "cares_init.hh"
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#include <ares.h>
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#include <string>
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#include <system_error>
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using namespace std::literals;
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auto malcontent::CAresLibrary::instance() -> std::shared_ptr<CAresLibrary> {
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if (auto ret = _instance.lock()) {
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return ret;
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}
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auto ret = std::make_shared<CAresLibrary>(Private{});
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_instance = ret;
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return ret;
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}
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malcontent::CAresLibrary::CAresLibrary(Private) {
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std::lock_guard guard { _init_mutex };
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int ret = ares_library_init(ARES_LIB_INIT_ALL);
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if (ret != ARES_SUCCESS) {
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const auto err = "ares_library_init: "s + ares_strerror(ret);
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throw std::system_error(ret, std::generic_category(), err.c_str());
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}
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}
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malcontent::CAresLibrary::~CAresLibrary() noexcept {
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std::lock_guard guard { _init_mutex };
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ares_library_cleanup();
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}
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std::mutex malcontent::CAresLibrary::_init_mutex{};
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std::weak_ptr<malcontent::CAresLibrary> malcontent::CAresLibrary::_instance{};
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