include/boost/corosio/native/detail/reactor/reactor_op_complete.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_REACTOR_REACTOR_OP_COMPLETE_HPP
11		#define BOOST_COROSIO_NATIVE_DETAIL_REACTOR_REACTOR_OP_COMPLETE_HPP
12
13		#include <boost/corosio/detail/dispatch_coro.hpp>
14		#include <boost/corosio/native/detail/endpoint_convert.hpp>
15		#include <boost/corosio/native/detail/make_err.hpp>
16		#include <boost/corosio/io/io_object.hpp>
17
18		#include <coroutine>
19		#include <mutex>
20		#include <utility>
21
22		#include <netinet/in.h>
23		#include <sys/socket.h>
24		#include <unistd.h>
25
26		namespace boost::corosio::detail {
27
28		/** Complete a base read/write operation.
29
30		Translates the recorded errno and cancellation state into
31		an error_code, stores the byte count, then resumes the
32		caller via symmetric transfer.
33
34		@tparam Op The concrete operation type.
35		@param op The operation to complete.
36		*/
37		template<typename Op>
38		void
39	88866x	complete_io_op(Op& op)
40		{
41	88866x	op.stop_cb.reset();
42	88866x	op.socket_impl_->desc_state_.scheduler_->reset_inline_budget();
43
44	88866x	if (op.cancelled.load(std::memory_order_acquire))
45	308x	*op.ec_out = capy::error::canceled;
46	88558x	else if (op.errn != 0)
47	✗	*op.ec_out = make_err(op.errn);
48	88558x	else if (op.is_read_operation() && op.bytes_transferred == 0)
49	✗	*op.ec_out = capy::error::eof;
50		else
51	88558x	*op.ec_out = {};
52
53	88866x	*op.bytes_out = op.bytes_transferred;
54
55	88866x	capy::executor_ref saved_ex(op.ex);
56	88866x	std::coroutine_handle<> saved_h(op.h);
57	88866x	auto prevent = std::move(op.impl_ptr);
58	88866x	dispatch_coro(saved_ex, saved_h).resume();
59	88866x	}
60
61		/** Complete a connect operation with endpoint caching.
62
63		On success, queries the local endpoint via getsockname and
64		caches both endpoints in the socket impl. Then resumes the
65		caller via symmetric transfer.
66
67		@tparam Op The concrete connect operation type.
68		@param op The operation to complete.
69		*/
70		template<typename Op>
71		void
72	4500x	complete_connect_op(Op& op)
73		{
74	4500x	op.stop_cb.reset();
75	4500x	op.socket_impl_->desc_state_.scheduler_->reset_inline_budget();
76
77	4500x	bool success =
78	4500x	(op.errn == 0 && !op.cancelled.load(std::memory_order_acquire));
79
80	4500x	if (success && op.socket_impl_)
81		{
82	4494x	endpoint local_ep;
83	4494x	sockaddr_storage local_storage{};
84	4494x	socklen_t local_len = sizeof(local_storage);
85	4494x	if (::getsockname(
86		op.fd, reinterpret_cast<sockaddr*>(&local_storage),
87	4494x	&local_len) == 0)
88	4494x	local_ep = from_sockaddr(local_storage);
89	4494x	op.socket_impl_->set_endpoints(local_ep, op.target_endpoint);
90		}
91
92	4500x	if (op.cancelled.load(std::memory_order_acquire))
93	✗	*op.ec_out = capy::error::canceled;
94	4500x	else if (op.errn != 0)
95	6x	*op.ec_out = make_err(op.errn);
96		else
97	4494x	*op.ec_out = {};
98
99	4500x	capy::executor_ref saved_ex(op.ex);
100	4500x	std::coroutine_handle<> saved_h(op.h);
101	4500x	auto prevent = std::move(op.impl_ptr);
102	4500x	dispatch_coro(saved_ex, saved_h).resume();
103	4500x	}
104
105		/** Construct and register a peer socket from an accepted fd.
106
107		Creates a new socket impl via the acceptor's associated
108		socket service, registers it with the scheduler, and caches
109		the local and remote endpoints.
110
111		@tparam SocketImpl The concrete socket implementation type.
112		@tparam AcceptorImpl The concrete acceptor implementation type.
113		@param acceptor_impl The acceptor that accepted the connection.
114		@param accepted_fd The accepted file descriptor (set to -1 on success).
115		@param peer_storage The peer address from accept().
116		@param impl_out Output pointer for the new socket impl.
117		@param ec_out Output pointer for any error.
118		@return True on success, false on failure.
119		*/
120		template<typename SocketImpl, typename AcceptorImpl>
121		bool
122	4484x	setup_accepted_socket(
123		AcceptorImpl* acceptor_impl,
124		int& accepted_fd,
125		sockaddr_storage const& peer_storage,
126		io_object::implementation** impl_out,
127		std::error_code* ec_out)
128		{
129	4484x	auto* socket_svc = acceptor_impl->service().tcp_service();
130	4484x	if (!socket_svc)
131		{
132	✗	*ec_out = make_err(ENOENT);
133	✗	return false;
134		}
135
136	4484x	auto& impl = static_cast<SocketImpl&>(*socket_svc->construct());
137	4484x	impl.set_socket(accepted_fd);
138
139	4484x	impl.desc_state_.fd = accepted_fd;
140		{
141	4484x	std::lock_guard lock(impl.desc_state_.mutex);
142	4484x	impl.desc_state_.read_op = nullptr;
143	4484x	impl.desc_state_.write_op = nullptr;
144	4484x	impl.desc_state_.connect_op = nullptr;
145	4484x	}
146	4484x	socket_svc->scheduler().register_descriptor(accepted_fd, &impl.desc_state_);
147
148	4484x	impl.set_endpoints(
149		acceptor_impl->local_endpoint(), from_sockaddr(peer_storage));
150
151	4484x	if (impl_out)
152	4484x	*impl_out = &impl;
153	4484x	accepted_fd = -1;
154	4484x	return true;
155		}
156
157		/** Complete an accept operation.
158
159		Sets up the peer socket on success, or closes the accepted
160		fd on failure. Then resumes the caller via symmetric transfer.
161
162		@tparam SocketImpl The concrete socket implementation type.
163		@tparam Op The concrete accept operation type.
164		@param op The operation to complete.
165		*/
166		template<typename SocketImpl, typename Op>
167		void
168	4496x	complete_accept_op(Op& op)
169		{
170	4496x	op.stop_cb.reset();
171	4496x	op.acceptor_impl_->desc_state_.scheduler_->reset_inline_budget();
172
173	4496x	bool success =
174	4496x	(op.errn == 0 && !op.cancelled.load(std::memory_order_acquire));
175
176	4496x	if (op.cancelled.load(std::memory_order_acquire))
177	12x	*op.ec_out = capy::error::canceled;
178	4484x	else if (op.errn != 0)
179	✗	*op.ec_out = make_err(op.errn);
180		else
181	4484x	*op.ec_out = {};
182
183	4496x	if (success && op.accepted_fd >= 0 && op.acceptor_impl_)
184		{
185	4484x	if (!setup_accepted_socket<SocketImpl>(
186	4484x	op.acceptor_impl_, op.accepted_fd, op.peer_storage, op.impl_out,
187		op.ec_out))
188	✗	success = false;
189		}
190
191	4496x	if (!success \|\| !op.acceptor_impl_)
192		{
193	12x	if (op.accepted_fd >= 0)
194		{
195	✗	::close(op.accepted_fd);
196	✗	op.accepted_fd = -1;
197		}
198	12x	if (op.impl_out)
199	12x	*op.impl_out = nullptr;
200		}
201
202	4496x	capy::executor_ref saved_ex(op.ex);
203	4496x	std::coroutine_handle<> saved_h(op.h);
204	4496x	auto prevent = std::move(op.impl_ptr);
205	4496x	dispatch_coro(saved_ex, saved_h).resume();
206	4496x	}
207
208		/** Complete a datagram operation (send_to or recv_from).
209
210		For recv_from operations, writes the source endpoint from the
211		recorded sockaddr_storage into the caller's endpoint pointer.
212		Then resumes the caller via symmetric transfer.
213
214		@tparam Op The concrete datagram operation type.
215		@param op The operation to complete.
216		@param source_out Optional pointer to store source endpoint
217		(non-null for recv_from, null for send_to).
218		*/
219		template<typename Op>
220		void
221	14x	complete_datagram_op(Op& op, endpoint* source_out)
222		{
223	14x	op.stop_cb.reset();
224	14x	op.socket_impl_->desc_state_.scheduler_->reset_inline_budget();
225
226	14x	if (op.cancelled.load(std::memory_order_acquire))
227	6x	*op.ec_out = capy::error::canceled;
228	8x	else if (op.errn != 0)
229	✗	*op.ec_out = make_err(op.errn);
230		else
231	8x	*op.ec_out = {};
232
233	14x	*op.bytes_out = op.bytes_transferred;
234
235	20x	if (source_out && !op.cancelled.load(std::memory_order_acquire) &&
236	6x	op.errn == 0)
237	6x	*source_out = from_sockaddr(op.source_storage);
238
239	14x	capy::executor_ref saved_ex(op.ex);
240	14x	std::coroutine_handle<> saved_h(op.h);
241	14x	auto prevent = std::move(op.impl_ptr);
242	14x	dispatch_coro(saved_ex, saved_h).resume();
243	14x	}
244
245		} // namespace boost::corosio::detail
246
247		#endif // BOOST_COROSIO_NATIVE_DETAIL_REACTOR_REACTOR_OP_COMPLETE_HPP
248