include/boost/corosio/native/detail/reactor/reactor_op_complete.hpp

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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	62362x	complete_io_op(Op& op)
40		{
41	62362x	op.stop_cb.reset();
42	62362x	op.socket_impl_->desc_state_.scheduler_->reset_inline_budget();
43
44	62362x	if (op.cancelled.load(std::memory_order_acquire))
45	272x	*op.ec_out = capy::error::canceled;
46	62090x	else if (op.errn != 0)
47	✗	*op.ec_out = make_err(op.errn);
48	62090x	else if (op.is_read_operation() && op.bytes_transferred == 0)
49	✗	*op.ec_out = capy::error::eof;
50		else
51	62090x	*op.ec_out = {};
52
53	62362x	*op.bytes_out = op.bytes_transferred;
54
55	62362x	op.cont_op.cont.h = op.h;
56	62362x	capy::executor_ref saved_ex(op.ex);
57	62362x	auto prevent = std::move(op.impl_ptr);
58	62362x	dispatch_coro(saved_ex, op.cont_op.cont).resume();
59	62362x	}
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	4084x	complete_connect_op(Op& op)
73		{
74	4084x	op.stop_cb.reset();
75	4084x	op.socket_impl_->desc_state_.scheduler_->reset_inline_budget();
76
77	4084x	bool success =
78	4084x	(op.errn == 0 && !op.cancelled.load(std::memory_order_acquire));
79
80	4084x	if (success && op.socket_impl_)
81		{
82	4079x	endpoint local_ep;
83	4079x	sockaddr_storage local_storage{};
84	4079x	socklen_t local_len = sizeof(local_storage);
85	4079x	if (::getsockname(
86		op.fd, reinterpret_cast<sockaddr*>(&local_storage),
87	4079x	&local_len) == 0)
88	4079x	local_ep = from_sockaddr(local_storage);
89	4079x	op.socket_impl_->set_endpoints(local_ep, op.target_endpoint);
90		}
91
92	4084x	if (op.cancelled.load(std::memory_order_acquire))
93	✗	*op.ec_out = capy::error::canceled;
94	4084x	else if (op.errn != 0)
95	5x	*op.ec_out = make_err(op.errn);
96		else
97	4079x	*op.ec_out = {};
98
99	4084x	op.cont_op.cont.h = op.h;
100	4084x	capy::executor_ref saved_ex(op.ex);
101	4084x	auto prevent = std::move(op.impl_ptr);
102	4084x	dispatch_coro(saved_ex, op.cont_op.cont).resume();
103	4084x	}
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	4069x	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	4069x	auto* socket_svc = acceptor_impl->service().tcp_service();
130	4069x	if (!socket_svc)
131		{
132	✗	*ec_out = make_err(ENOENT);
133	✗	return false;
134		}
135
136	4069x	auto& impl = static_cast<SocketImpl&>(*socket_svc->construct());
137	4069x	impl.set_socket(accepted_fd);
138
139	4069x	impl.desc_state_.fd = accepted_fd;
140		{
141	4069x	std::lock_guard lock(impl.desc_state_.mutex);
142	4069x	impl.desc_state_.read_op = nullptr;
143	4069x	impl.desc_state_.write_op = nullptr;
144	4069x	impl.desc_state_.connect_op = nullptr;
145	4069x	}
146	4069x	socket_svc->scheduler().register_descriptor(accepted_fd, &impl.desc_state_);
147
148	4069x	impl.set_endpoints(
149		acceptor_impl->local_endpoint(), from_sockaddr(peer_storage));
150
151	4069x	if (impl_out)
152	4069x	*impl_out = &impl;
153	4069x	accepted_fd = -1;
154	4069x	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	4081x	complete_accept_op(Op& op)
169		{
170	4081x	op.stop_cb.reset();
171	4081x	op.acceptor_impl_->desc_state_.scheduler_->reset_inline_budget();
172
173	4081x	bool success =
174	4081x	(op.errn == 0 && !op.cancelled.load(std::memory_order_acquire));
175
176	4081x	if (op.cancelled.load(std::memory_order_acquire))
177	12x	*op.ec_out = capy::error::canceled;
178	4069x	else if (op.errn != 0)
179	✗	*op.ec_out = make_err(op.errn);
180		else
181	4069x	*op.ec_out = {};
182
183	4081x	if (success && op.accepted_fd >= 0 && op.acceptor_impl_)
184		{
185	4069x	if (!setup_accepted_socket<SocketImpl>(
186	4069x	op.acceptor_impl_, op.accepted_fd, op.peer_storage, op.impl_out,
187		op.ec_out))
188	✗	success = false;
189		}
190
191	4081x	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	4081x	op.cont_op.cont.h = op.h;
203	4081x	capy::executor_ref saved_ex(op.ex);
204	4081x	auto prevent = std::move(op.impl_ptr);
205	4081x	dispatch_coro(saved_ex, op.cont_op.cont).resume();
206	4081x	}
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	op.cont_op.cont.h = op.h;
240	14x	capy::executor_ref saved_ex(op.ex);
241	14x	auto prevent = std::move(op.impl_ptr);
242	14x	dispatch_coro(saved_ex, op.cont_op.cont).resume();
243	14x	}
244
245		} // namespace boost::corosio::detail
246
247		#endif // BOOST_COROSIO_NATIVE_DETAIL_REACTOR_REACTOR_OP_COMPLETE_HPP
248