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

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epoll_local_stream_acceptor_service.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_EPOLL_EPOLL_LOCAL_STREAM_ACCEPTOR_SERVICE_HPP
11		#define BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_LOCAL_STREAM_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/local_stream_acceptor_service.hpp>
20
21		#include <boost/corosio/native/detail/epoll/epoll_local_stream_acceptor.hpp>
22		#include <boost/corosio/native/detail/epoll/epoll_local_stream_service.hpp>
23		#include <boost/corosio/native/detail/epoll/epoll_scheduler.hpp>
24		#include <boost/corosio/native/detail/reactor/reactor_acceptor_service.hpp>
25		#include <boost/corosio/native/detail/reactor/reactor_op_complete.hpp>
26
27		#include <memory>
28		#include <mutex>
29		#include <utility>
30
31		#include <errno.h>
32		#include <sys/socket.h>
33		#include <sys/un.h>
34		#include <unistd.h>
35
36		namespace boost::corosio::detail {
37
38		/* epoll local stream acceptor service implementation.
39
40		Inherits from local_stream_acceptor_service to enable runtime
41		polymorphism. Uses key_type = local_stream_acceptor_service
42		for service lookup.
43		*/
44		class BOOST_COROSIO_DECL epoll_local_stream_acceptor_service final
45		: public reactor_acceptor_service<
46		epoll_local_stream_acceptor_service,
47		local_stream_acceptor_service,
48		epoll_scheduler,
49		epoll_local_stream_acceptor,
50		epoll_local_stream_service>
51		{
52		using base_type = reactor_acceptor_service<
53		epoll_local_stream_acceptor_service,
54		local_stream_acceptor_service,
55		epoll_scheduler,
56		epoll_local_stream_acceptor,
57		epoll_local_stream_service>;
58		friend base_type;
59
60		public:
61		explicit epoll_local_stream_acceptor_service(capy::execution_context& ctx);
62		~epoll_local_stream_acceptor_service() override;
63
64		std::error_code open_acceptor_socket(
65		local_stream_acceptor::implementation& impl,
66		int family,
67		int type,
68		int protocol) override;
69		std::error_code bind_acceptor(
70		local_stream_acceptor::implementation& impl,
71		corosio::local_endpoint ep) override;
72		std::error_code listen_acceptor(
73		local_stream_acceptor::implementation& impl,
74		int backlog) override;
75		};
76
77		inline void
78	✗	epoll_local_accept_op::cancel() noexcept
79		{
80	✗	if (acceptor_impl_)
81	✗	acceptor_impl_->cancel_single_op(*this);
82		else
83	✗	request_cancel();
84	✗	}
85
86		inline void
87	2x	epoll_local_accept_op::operator()()
88		{
89	2x	complete_accept_op<epoll_local_stream_socket>(*this);
90	2x	}
91
92	6x	inline epoll_local_stream_acceptor::epoll_local_stream_acceptor(
93	6x	epoll_local_stream_acceptor_service& svc) noexcept
94	6x	: reactor_acceptor(svc)
95		{
96	6x	}
97
98		inline std::coroutine_handle<>
99	2x	epoll_local_stream_acceptor::accept(
100		std::coroutine_handle<> h,
101		capy::executor_ref ex,
102		std::stop_token token,
103		std::error_code* ec,
104		io_object::implementation** impl_out)
105		{
106	2x	auto& op = acc_;
107	2x	op.reset();
108	2x	op.h = h;
109	2x	op.ex = ex;
110	2x	op.ec_out = ec;
111	2x	op.impl_out = impl_out;
112	2x	op.fd = fd_;
113	2x	op.start(token, this);
114
115	2x	sockaddr_storage peer_storage{};
116	2x	socklen_t addrlen = sizeof(peer_storage);
117		int accepted;
118		do
119		{
120	2x	accepted = ::accept4(
121		fd_, reinterpret_cast<sockaddr*>(&peer_storage), &addrlen,
122		SOCK_NONBLOCK \| SOCK_CLOEXEC);
123		}
124	2x	while (accepted < 0 && errno == EINTR);
125
126	2x	if (accepted >= 0)
127		{
128		{
129	✗	std::lock_guard lock(desc_state_.mutex);
130	✗	desc_state_.read_ready = false;
131	✗	}
132
133	✗	if (svc_.scheduler().try_consume_inline_budget())
134		{
135	✗	auto* socket_svc = svc_.stream_service();
136	✗	if (socket_svc)
137		{
138		auto& impl =
139		static_cast<epoll_local_stream_socket&>(
140	✗	*socket_svc->construct());
141	✗	impl.set_socket(accepted);
142
143	✗	impl.desc_state_.fd = accepted;
144		{
145	✗	std::lock_guard lock(impl.desc_state_.mutex);
146	✗	impl.desc_state_.read_op = nullptr;
147	✗	impl.desc_state_.write_op = nullptr;
148	✗	impl.desc_state_.connect_op = nullptr;
149	✗	}
150	✗	socket_svc->scheduler().register_descriptor(
151		accepted, &impl.desc_state_);
152
153	✗	impl.set_endpoints(
154		local_endpoint_,
155	✗	from_sockaddr_as(peer_storage, addrlen, corosio::local_endpoint{}));
156
157	✗	if (ec)
158	✗	*ec = {};
159	✗	if (impl_out)
160	✗	*impl_out = &impl;
161		}
162		else
163		{
164	✗	::close(accepted);
165	✗	if (ec)
166	✗	*ec = make_err(ENOENT);
167	✗	if (impl_out)
168	✗	*impl_out = nullptr;
169		}
170	✗	op.cont_op.cont.h = h;
171	✗	return dispatch_coro(ex, op.cont_op.cont);
172		}
173
174	✗	op.accepted_fd = accepted;
175	✗	op.peer_storage = peer_storage;
176	✗	op.peer_addrlen = addrlen;
177	✗	op.complete(0, 0);
178	✗	op.impl_ptr = shared_from_this();
179	✗	svc_.post(&op);
180	✗	return std::noop_coroutine();
181		}
182
183	2x	if (errno == EAGAIN \|\| errno == EWOULDBLOCK)
184		{
185	2x	op.impl_ptr = shared_from_this();
186	2x	svc_.work_started();
187
188	2x	std::lock_guard lock(desc_state_.mutex);
189	2x	bool io_done = false;
190	2x	if (desc_state_.read_ready)
191		{
192	✗	desc_state_.read_ready = false;
193	✗	op.perform_io();
194	✗	io_done = (op.errn != EAGAIN && op.errn != EWOULDBLOCK);
195	✗	if (!io_done)
196	✗	op.errn = 0;
197		}
198
199	2x	if (io_done \|\| op.cancelled.load(std::memory_order_acquire))
200		{
201	✗	svc_.post(&op);
202	✗	svc_.work_finished();
203		}
204		else
205		{
206	2x	desc_state_.read_op = &op;
207		}
208	2x	return std::noop_coroutine();
209	2x	}
210
211	✗	op.complete(errno, 0);
212	✗	op.impl_ptr = shared_from_this();
213	✗	svc_.post(&op);
214		// completion is always posted to scheduler queue, never inline.
215	✗	return std::noop_coroutine();
216		}
217
218		inline void
219	✗	epoll_local_stream_acceptor::cancel() noexcept
220		{
221	✗	do_cancel();
222	✗	}
223
224		inline void
225	24x	epoll_local_stream_acceptor::close_socket() noexcept
226		{
227	24x	do_close_socket();
228	24x	}
229
230		inline native_handle_type
231	✗	epoll_local_stream_acceptor::release_socket() noexcept
232		{
233	✗	return this->do_release_socket();
234		}
235
236	356x	inline epoll_local_stream_acceptor_service::
237	356x	epoll_local_stream_acceptor_service(capy::execution_context& ctx)
238	356x	: base_type(ctx)
239		{
240	356x	auto* svc = ctx_.find_service<detail::local_stream_service>();
241	356x	stream_svc_ = svc
242	356x	? dynamic_cast<epoll_local_stream_service*>(svc)
243		: nullptr;
244	356x	assert(stream_svc_ &&
245		"local_stream_service must be registered before acceptor service");
246	356x	}
247
248	712x	inline epoll_local_stream_acceptor_service::
249	712x	~epoll_local_stream_acceptor_service() {}
250
251		inline std::error_code
252	6x	epoll_local_stream_acceptor_service::open_acceptor_socket(
253		local_stream_acceptor::implementation& impl,
254		int family,
255		int type,
256		int protocol)
257		{
258	6x	auto* epoll_impl = static_cast<epoll_local_stream_acceptor*>(&impl);
259	6x	epoll_impl->close_socket();
260
261	6x	int fd = ::socket(family, type \| SOCK_NONBLOCK \| SOCK_CLOEXEC, protocol);
262	6x	if (fd < 0)
263	✗	return make_err(errno);
264
265	6x	epoll_impl->fd_ = fd;
266
267		// Set up descriptor state but do NOT register with epoll yet
268	6x	epoll_impl->desc_state_.fd = fd;
269		{
270	6x	std::lock_guard lock(epoll_impl->desc_state_.mutex);
271	6x	epoll_impl->desc_state_.read_op = nullptr;
272	6x	}
273
274	6x	return {};
275		}
276
277		inline std::error_code
278	6x	epoll_local_stream_acceptor_service::bind_acceptor(
279		local_stream_acceptor::implementation& impl, corosio::local_endpoint ep)
280		{
281	6x	return static_cast<epoll_local_stream_acceptor*>(&impl)->do_bind(ep);
282		}
283
284		inline std::error_code
285	2x	epoll_local_stream_acceptor_service::listen_acceptor(
286		local_stream_acceptor::implementation& impl, int backlog)
287		{
288	2x	return static_cast<epoll_local_stream_acceptor*>(&impl)->do_listen(backlog);
289		}
290
291
292		} // namespace boost::corosio::detail
293
294		#endif // BOOST_COROSIO_HAS_EPOLL
295
296		#endif // BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_LOCAL_STREAM_ACCEPTOR_SERVICE_HPP
297