include/boost/corosio/native/detail/epoll/epoll_tcp_acceptor_service.hpp

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epoll_tcp_acceptor_service.hpp

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1		//
2		// Copyright (c) 2026 Steve Gerbino
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_EPOLL_EPOLL_TCP_ACCEPTOR_SERVICE_HPP
11		#define BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_TCP_ACCEPTOR_SERVICE_HPP
12
13		#include <boost/corosio/detail/platform.hpp>
14
15		#if BOOST_COROSIO_HAS_EPOLL
16
17		#include <boost/corosio/detail/config.hpp>
18		#include <boost/capy/ex/execution_context.hpp>
19		#include <boost/corosio/detail/tcp_acceptor_service.hpp>
20
21		#include <boost/corosio/native/detail/epoll/epoll_tcp_acceptor.hpp>
22		#include <boost/corosio/native/detail/epoll/epoll_tcp_service.hpp>
23		#include <boost/corosio/native/detail/epoll/epoll_scheduler.hpp>
24		#include <boost/corosio/native/detail/reactor/reactor_service_state.hpp>
25
26		#include <boost/corosio/native/detail/reactor/reactor_op_complete.hpp>
27
28		#include <memory>
29		#include <mutex>
30		#include <utility>
31
32		#include <errno.h>
33		#include <netinet/in.h>
34		#include <sys/epoll.h>
35		#include <sys/socket.h>
36		#include <unistd.h>
37
38		namespace boost::corosio::detail {
39
40		/// State for epoll acceptor service.
41		using epoll_tcp_acceptor_state =
42		reactor_service_state<epoll_scheduler, epoll_tcp_acceptor>;
43
44		/** epoll acceptor service implementation.
45
46		Inherits from tcp_acceptor_service to enable runtime polymorphism.
47		Uses key_type = tcp_acceptor_service for service lookup.
48		*/
49		class BOOST_COROSIO_DECL epoll_tcp_acceptor_service final
50		: public tcp_acceptor_service
51		{
52		public:
53		explicit epoll_tcp_acceptor_service(capy::execution_context& ctx);
54		~epoll_tcp_acceptor_service() override;
55
56		epoll_tcp_acceptor_service(epoll_tcp_acceptor_service const&) = delete;
57		epoll_tcp_acceptor_service&
58		operator=(epoll_tcp_acceptor_service const&) = delete;
59
60		void shutdown() override;
61
62		io_object::implementation* construct() override;
63		void destroy(io_object::implementation*) override;
64		void close(io_object::handle&) override;
65		std::error_code open_acceptor_socket(
66		tcp_acceptor::implementation& impl,
67		int family,
68		int type,
69		int protocol) override;
70		std::error_code
71		bind_acceptor(tcp_acceptor::implementation& impl, endpoint ep) override;
72		std::error_code
73		listen_acceptor(tcp_acceptor::implementation& impl, int backlog) override;
74
75	152x	epoll_scheduler& scheduler() const noexcept
76		{
77	152x	return state_->sched_;
78		}
79		void post(scheduler_op* op);
80		void work_started() noexcept;
81		void work_finished() noexcept;
82
83		/** Get the TCP service for creating peer sockets during accept. */
84		epoll_tcp_service* tcp_service() const noexcept;
85
86		private:
87		capy::execution_context& ctx_;
88		std::unique_ptr<epoll_tcp_acceptor_state> state_;
89		};
90
91		inline void
92	6x	epoll_accept_op::cancel() noexcept
93		{
94	6x	if (acceptor_impl_)
95	6x	acceptor_impl_->cancel_single_op(*this);
96		else
97	✗	request_cancel();
98	6x	}
99
100		inline void
101	4381x	epoll_accept_op::operator()()
102		{
103	4381x	complete_accept_op<epoll_tcp_socket>(*this);
104	4381x	}
105
106	80x	inline epoll_tcp_acceptor::epoll_tcp_acceptor(
107	80x	epoll_tcp_acceptor_service& svc) noexcept
108	80x	: reactor_acceptor(svc)
109		{
110	80x	}
111
112		inline std::coroutine_handle<>
113	4381x	epoll_tcp_acceptor::accept(
114		std::coroutine_handle<> h,
115		capy::executor_ref ex,
116		std::stop_token token,
117		std::error_code* ec,
118		io_object::implementation** impl_out)
119		{
120	4381x	auto& op = acc_;
121	4381x	op.reset();
122	4381x	op.h = h;
123	4381x	op.ex = ex;
124	4381x	op.ec_out = ec;
125	4381x	op.impl_out = impl_out;
126	4381x	op.fd = fd_;
127	4381x	op.start(token, this);
128
129	4381x	sockaddr_storage peer_storage{};
130	4381x	socklen_t addrlen = sizeof(peer_storage);
131		int accepted;
132		do
133		{
134	4381x	accepted = ::accept4(
135		fd_, reinterpret_cast<sockaddr*>(&peer_storage), &addrlen,
136		SOCK_NONBLOCK \| SOCK_CLOEXEC);
137		}
138	4381x	while (accepted < 0 && errno == EINTR);
139
140	4381x	if (accepted >= 0)
141		{
142		{
143	2x	std::lock_guard lock(desc_state_.mutex);
144	2x	desc_state_.read_ready = false;
145	2x	}
146
147	2x	if (svc_.scheduler().try_consume_inline_budget())
148		{
149	✗	auto* socket_svc = svc_.tcp_service();
150	✗	if (socket_svc)
151		{
152		auto& impl =
153	✗	static_cast<epoll_tcp_socket&>(*socket_svc->construct());
154	✗	impl.set_socket(accepted);
155
156	✗	impl.desc_state_.fd = accepted;
157		{
158	✗	std::lock_guard lock(impl.desc_state_.mutex);
159	✗	impl.desc_state_.read_op = nullptr;
160	✗	impl.desc_state_.write_op = nullptr;
161	✗	impl.desc_state_.connect_op = nullptr;
162	✗	}
163	✗	socket_svc->scheduler().register_descriptor(
164		accepted, &impl.desc_state_);
165
166	✗	impl.set_endpoints(
167		local_endpoint_, from_sockaddr(peer_storage));
168
169	✗	*ec = {};
170	✗	if (impl_out)
171	✗	*impl_out = &impl;
172		}
173		else
174		{
175	✗	::close(accepted);
176	✗	*ec = make_err(ENOENT);
177	✗	if (impl_out)
178	✗	*impl_out = nullptr;
179		}
180	✗	op.cont_op.cont.h = h;
181	✗	return dispatch_coro(ex, op.cont_op.cont);
182		}
183
184	2x	op.accepted_fd = accepted;
185	2x	op.peer_storage = peer_storage;
186	2x	op.complete(0, 0);
187	2x	op.impl_ptr = shared_from_this();
188	2x	svc_.post(&op);
189	2x	return std::noop_coroutine();
190		}
191
192	4379x	if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
193		{
194	4379x	op.impl_ptr = shared_from_this();
195	4379x	svc_.work_started();
196
197	4379x	std::lock_guard lock(desc_state_.mutex);
198	4379x	bool io_done = false;
199	4379x	if (desc_state_.read_ready)
200		{
201	✗	desc_state_.read_ready = false;
202	✗	op.perform_io();
203	✗	io_done = (op.errn != EAGAIN && op.errn != EWOULDBLOCK);
204	✗	if (!io_done)
205	✗	op.errn = 0;
206		}
207
208	4379x	if (io_done \|\| op.cancelled.load(std::memory_order_acquire))
209		{
210	✗	svc_.post(&op);
211	✗	svc_.work_finished();
212		}
213		else
214		{
215	4379x	desc_state_.read_op = &op;
216		}
217	4379x	return std::noop_coroutine();
218	4379x	}
219
220	✗	op.complete(errno, 0);
221	✗	op.impl_ptr = shared_from_this();
222	✗	svc_.post(&op);
223		// completion is always posted to scheduler queue, never inline.
224	✗	return std::noop_coroutine();
225		}
226
227		inline void
228	2x	epoll_tcp_acceptor::cancel() noexcept
229		{
230	2x	do_cancel();
231	2x	}
232
233		inline void
234	318x	epoll_tcp_acceptor::close_socket() noexcept
235		{
236	318x	do_close_socket();
237	318x	}
238
239	320x	inline epoll_tcp_acceptor_service::epoll_tcp_acceptor_service(
240	320x	capy::execution_context& ctx)
241	320x	: ctx_(ctx)
242	320x	, state_(
243		std::make_unique<epoll_tcp_acceptor_state>(
244	320x	ctx.use_service<epoll_scheduler>()))
245		{
246	320x	}
247
248	640x	inline epoll_tcp_acceptor_service::~epoll_tcp_acceptor_service() {}
249
250		inline void
251	320x	epoll_tcp_acceptor_service::shutdown()
252		{
253	320x	std::lock_guard lock(state_->mutex_);
254
255	320x	while (auto* impl = state_->impl_list_.pop_front())
256	✗	impl->close_socket();
257
258		// Don't clear impl_ptrs_ here — same rationale as
259		// epoll_tcp_service::shutdown(). Let ~state_ release ptrs
260		// after scheduler shutdown has drained all queued ops.
261	320x	}
262
263		inline io_object::implementation*
264	80x	epoll_tcp_acceptor_service::construct()
265		{
266	80x	auto impl = std::make_shared<epoll_tcp_acceptor>(*this);
267	80x	auto* raw = impl.get();
268
269	80x	std::lock_guard lock(state_->mutex_);
270	80x	state_->impl_ptrs_.emplace(raw, std::move(impl));
271	80x	state_->impl_list_.push_back(raw);
272
273	80x	return raw;
274	80x	}
275
276		inline void
277	80x	epoll_tcp_acceptor_service::destroy(io_object::implementation* impl)
278		{
279	80x	auto* epoll_impl = static_cast<epoll_tcp_acceptor*>(impl);
280	80x	epoll_impl->close_socket();
281	80x	std::lock_guard lock(state_->mutex_);
282	80x	state_->impl_list_.remove(epoll_impl);
283	80x	state_->impl_ptrs_.erase(epoll_impl);
284	80x	}
285
286		inline void
287	159x	epoll_tcp_acceptor_service::close(io_object::handle& h)
288		{
289	159x	static_cast<epoll_tcp_acceptor*>(h.get())->close_socket();
290	159x	}
291
292		inline std::error_code
293	79x	epoll_tcp_acceptor_service::open_acceptor_socket(
294		tcp_acceptor::implementation& impl, int family, int type, int protocol)
295		{
296	79x	auto* epoll_impl = static_cast<epoll_tcp_acceptor*>(&impl);
297	79x	epoll_impl->close_socket();
298
299	79x	int fd = ::socket(family, type \| SOCK_NONBLOCK \| SOCK_CLOEXEC, protocol);
300	79x	if (fd < 0)
301	✗	return make_err(errno);
302
303	79x	if (family == AF_INET6)
304		{
305	8x	int val = 0; // dual-stack default
306	8x	::setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
307		}
308
309	79x	epoll_impl->fd_ = fd;
310
311		// Set up descriptor state but do NOT register with epoll yet
312	79x	epoll_impl->desc_state_.fd = fd;
313		{
314	79x	std::lock_guard lock(epoll_impl->desc_state_.mutex);
315	79x	epoll_impl->desc_state_.read_op = nullptr;
316	79x	}
317
318	79x	return {};
319		}
320
321		inline std::error_code
322	78x	epoll_tcp_acceptor_service::bind_acceptor(
323		tcp_acceptor::implementation& impl, endpoint ep)
324		{
325	78x	return static_cast<epoll_tcp_acceptor*>(&impl)->do_bind(ep);
326		}
327
328		inline std::error_code
329	75x	epoll_tcp_acceptor_service::listen_acceptor(
330		tcp_acceptor::implementation& impl, int backlog)
331		{
332	75x	return static_cast<epoll_tcp_acceptor*>(&impl)->do_listen(backlog);
333		}
334
335		inline void
336	11x	epoll_tcp_acceptor_service::post(scheduler_op* op)
337		{
338	11x	state_->sched_.post(op);
339	11x	}
340
341		inline void
342	4379x	epoll_tcp_acceptor_service::work_started() noexcept
343		{
344	4379x	state_->sched_.work_started();
345	4379x	}
346
347		inline void
348	9x	epoll_tcp_acceptor_service::work_finished() noexcept
349		{
350	9x	state_->sched_.work_finished();
351	9x	}
352
353		inline epoll_tcp_service*
354	4372x	epoll_tcp_acceptor_service::tcp_service() const noexcept
355		{
356	4372x	auto* svc = ctx_.find_service<detail::tcp_service>();
357	4372x	return svc ? dynamic_cast<epoll_tcp_service*>(svc) : nullptr;
358		}
359
360		} // namespace boost::corosio::detail
361
362		#endif // BOOST_COROSIO_HAS_EPOLL
363
364		#endif // BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_TCP_ACCEPTOR_SERVICE_HPP
365