/usr/include/asio/ip/host_name.hpp is in libasio-dev 1:1.10.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// ip/host_name.hpp
// ~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef ASIO_IP_HOST_NAME_HPP
#define ASIO_IP_HOST_NAME_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include <string>
#include "asio/error_code.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace ip {
/// Get the current host name.
ASIO_DECL std::string host_name();
/// Get the current host name.
ASIO_DECL std::string host_name(asio::error_code& ec);
} // namespace ip
} // namespace asio
#include "asio/detail/pop_options.hpp"
#if defined(ASIO_HEADER_ONLY)
# include "asio/ip/impl/host_name.ipp"
#endif // defined(ASIO_HEADER_ONLY)
#endif // ASIO_IP_HOST_NAME_HPP
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