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//
 
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// Copyright (c) 2026 Steve Gerbino
 
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//
 
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
 
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
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//
 
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// Official repository: https://github.com/cppalliance/corosio
 
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//
 
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#ifndef BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_SOCKET_HPP
 
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#define BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_SOCKET_HPP
 
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#include <boost/corosio/detail/platform.hpp>
 
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#if BOOST_COROSIO_HAS_EPOLL
 
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#include <boost/corosio/tcp_socket.hpp>
 
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#include <boost/capy/ex/executor_ref.hpp>
 
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#include <boost/corosio/detail/intrusive.hpp>
 
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#include <boost/corosio/native/detail/epoll/epoll_op.hpp>
 
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#include <memory>
 
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namespace boost::corosio::detail {
 
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class epoll_socket_service;
 
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/// Socket implementation for epoll backend.
 
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class epoll_socket final
 
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    : public tcp_socket::implementation
 
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    , public std::enable_shared_from_this<epoll_socket>
 
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    , public intrusive_list<epoll_socket>::node
 
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{
 
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    friend class epoll_socket_service;
 
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public:
 
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    explicit epoll_socket(epoll_socket_service& svc) noexcept;
 
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    ~epoll_socket() override;
 
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    std::coroutine_handle<> connect(
 
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        std::coroutine_handle<>,
 
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        capy::executor_ref,
 
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        endpoint,
 
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        std::stop_token,
 
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        std::error_code*) override;
 
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    std::coroutine_handle<> read_some(
 
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        std::coroutine_handle<>,
 
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        capy::executor_ref,
 
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        io_buffer_param,
 
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        std::stop_token,
 
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        std::error_code*,
 
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        std::size_t*) override;
 
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    std::coroutine_handle<> write_some(
 
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        std::coroutine_handle<>,
 
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        capy::executor_ref,
 
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        io_buffer_param,
 
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        std::stop_token,
 
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        std::error_code*,
 
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        std::size_t*) override;
 
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    std::error_code shutdown(tcp_socket::shutdown_type what) noexcept override;
 
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    native_handle_type native_handle() const noexcept override
 
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    {
 
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        return fd_;
 
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    }
 
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    // Socket options
 
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    std::error_code set_no_delay(bool value) noexcept override;
 
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    bool no_delay(std::error_code& ec) const noexcept override;
 
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    std::error_code set_keep_alive(bool value) noexcept override;
 
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    bool keep_alive(std::error_code& ec) const noexcept override;
 
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    std::error_code set_receive_buffer_size(int size) noexcept override;
 
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    int receive_buffer_size(std::error_code& ec) const noexcept override;
 
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    std::error_code set_send_buffer_size(int size) noexcept override;
 
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    int send_buffer_size(std::error_code& ec) const noexcept override;
 
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    std::error_code set_linger(bool enabled, int timeout) noexcept override;
 
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    tcp_socket::linger_options
 
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    linger(std::error_code& ec) const noexcept override;
 
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    endpoint local_endpoint() const noexcept override
 
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    {
 
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        return local_endpoint_;
 
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    }
 
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    endpoint remote_endpoint() const noexcept override
 
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    {
 
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        return remote_endpoint_;
 
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    }
 
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    bool is_open() const noexcept
 
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    {
 
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        return fd_ >= 0;
 
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    }
 
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    void cancel() noexcept override;
 
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    void cancel_single_op(epoll_op& op) noexcept;
 
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    void close_socket() noexcept;
 
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    void set_socket(int fd) noexcept
 
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    {
 
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        fd_ = fd;
 
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    }
 
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    void set_endpoints(endpoint local, endpoint remote) noexcept
 
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    {
 
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        local_endpoint_  = local;
 
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        remote_endpoint_ = remote;
 
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    }
 
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    epoll_connect_op conn_;
 
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    epoll_read_op rd_;
 
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    epoll_write_op wr_;
 
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    /// Per-descriptor state for persistent epoll registration
 
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    descriptor_state desc_state_;
 
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private:
 
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    epoll_socket_service& svc_;
 
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    int fd_ = -1;
 
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    endpoint local_endpoint_;
 
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    endpoint remote_endpoint_;
 
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    void register_op(
 
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        epoll_op& op,
 
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        epoll_op*& desc_slot,
 
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        bool& ready_flag,
 
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        bool& cancel_flag) noexcept;
 
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    friend struct epoll_op;
 
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    friend struct epoll_connect_op;
 
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};
 
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} // namespace boost::corosio::detail
 
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#endif // BOOST_COROSIO_HAS_EPOLL
 
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#endif // BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_SOCKET_HPP