include/boost/corosio/native/detail/native_socket_base.hpp

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native_socket_base.hpp

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1		//
2		// Copyright (c) 2026 Michael Vandeberg
3		//
4		// Distributed under the Boost Software License, Version 1.0. (See accompanying
5		// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6		//
7		// Official repository: https://github.com/cppalliance/corosio
8		//
9
10		#ifndef BOOST_COROSIO_NATIVE_DETAIL_NATIVE_SOCKET_BASE_HPP
11		#define BOOST_COROSIO_NATIVE_DETAIL_NATIVE_SOCKET_BASE_HPP
12
13		#include <boost/corosio/detail/native_handle.hpp>
14		#include <boost/corosio/endpoint.hpp>
15		#include <boost/corosio/native/detail/endpoint_convert.hpp>
16		#include <boost/corosio/native/detail/make_err.hpp>
17
18		#include <memory>
19		#include <system_error>
20
21		#include <errno.h>
22		#include <sys/socket.h>
23
24		/*
25		Readiness/completion-agnostic socket base for the POSIX-fd backends.
26
27		Holds the part of a socket impl that does not care whether the backend
28		is readiness-based (epoll/kqueue/select, which park ops on a
29		descriptor_state) or completion-based (io_uring, which submits SQEs):
30		the file descriptor, the cached local endpoint, the impl lifecycle
31		bases (enable_shared_from_this + the service's intrusive tracking node),
32		and the synchronous accessors (native_handle / options / bind).
33
34		reactor_basic_socket derives from this and adds the readiness machinery
35		(descriptor_state, register_op, the cancel/close that deregister from
36		the reactor). io_uring's socket impls derive from it and add their op
37		slots + SQE submission. This is the socket-layer analogue of io_uring
38		deriving from reactor_scheduler: io_uring sockets share the reactor's
39		readiness-agnostic socket surface, while the on-EAGAIN action (park vs
40		submit-SQE) and the op model stay backend-specific.
41
42		@tparam Derived The concrete socket type (CRTP, for shared_from_this
43		and the intrusive node).
44		@tparam ImplBase The public vtable base (tcp_socket::implementation,
45		udp_socket::implementation, ...).
46		@tparam Endpoint The endpoint type (endpoint or local_endpoint).
47		*/
48
49		namespace boost::corosio::detail {
50
51		template<class Derived, class ImplBase, class Endpoint = endpoint>
52		class native_socket_base
53		: public ImplBase
54		, public std::enable_shared_from_this<Derived>
55		{
56		protected:
57		// CRTP base: not publicly constructible. The check's preferred fix
58		// (private ctor + `friend Derived`) is infeasible here — the reactor
59		// sockets reach this base through intermediate templates
60		// (reactor_stream_socket -> reactor_basic_socket) that are not `Derived`,
61		// so a private ctor would stop those intermediates from constructing it.
62		// Protected is the correct access; suppress the private-only suggestion.
63	21888x	native_socket_base() = default; // NOLINT(bugprone-crtp-constructor-accessibility)
64
65		int fd_ = -1;
66		// mutable so a derived const local_endpoint() override can lazily fill
67		// it via getsockname() on first read (io_uring's lazy_pending state).
68		mutable Endpoint local_endpoint_;
69
70		public:
71	21888x	~native_socket_base() override = default;
72
73		/// Return the underlying file descriptor.
74	66551x	native_handle_type native_handle() const noexcept override
75		{
76	66551x	return fd_;
77		}
78
79		/// Return the cached local endpoint.
80	106x	Endpoint local_endpoint() const noexcept override
81		{
82	106x	return local_endpoint_;
83		}
84
85		/// Return true if the socket has an open file descriptor.
86		bool is_open() const noexcept
87		{
88		return fd_ >= 0;
89		}
90
91		/// Set a socket option.
92	66x	std::error_code set_option(
93		int level, int optname, void const* data, std::size_t size)
94		noexcept override
95		{
96	66x	if (::setsockopt(
97	66x	fd_, level, optname, data, static_cast<socklen_t>(size)) != 0)
98	2x	return make_err(errno);
99	64x	return {};
100		}
101
102		/// Get a socket option.
103	102x	std::error_code get_option(
104		int level, int optname, void* data, std::size_t* size)
105		const noexcept override
106		{
107	102x	socklen_t len = static_cast<socklen_t>(*size);
108	102x	if (::getsockopt(fd_, level, optname, data, &len) != 0)
109	✗	return make_err(errno);
110	102x	*size = static_cast<std::size_t>(len);
111	102x	return {};
112		}
113
114		/// Assign the file descriptor.
115	7113x	void set_socket(int fd) noexcept
116		{
117	7113x	fd_ = fd;
118	7113x	}
119
120		/// Cache the local endpoint.
121		void set_local_endpoint(Endpoint ep) noexcept
122		{
123		local_endpoint_ = ep;
124		}
125
126		/** Bind the socket to a local endpoint.
127
128		Calls ::bind() and caches the resulting local endpoint via
129		getsockname(). Readiness-agnostic; usable by any fd backend.
130
131		@param ep The endpoint to bind to.
132		@return Error code on failure, empty on success.
133		*/
134	136x	std::error_code do_bind(Endpoint const& ep) noexcept
135		{
136	136x	sockaddr_storage storage{};
137	136x	socklen_t addrlen = to_sockaddr(ep, socket_family(fd_), storage);
138	136x	if (::bind(fd_, reinterpret_cast<sockaddr*>(&storage), addrlen) != 0)
139	10x	return make_err(errno);
140
141	126x	sockaddr_storage local_storage{};
142	126x	socklen_t local_len = sizeof(local_storage);
143	126x	if (::getsockname(
144		fd_, reinterpret_cast<sockaddr*>(&local_storage), &local_len)
145	126x	== 0)
146	96x	local_endpoint_ =
147	126x	from_sockaddr_as(local_storage, local_len, Endpoint{});
148
149	126x	return {};
150		}
151		};
152
153		} // namespace boost::corosio::detail
154
155		#endif // BOOST_COROSIO_NATIVE_DETAIL_NATIVE_SOCKET_BASE_HPP
156