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	81311x	complete_io_op(Op& op)
40		{
41	81311x	op.stop_cb.reset();
42	81311x	op.socket_impl_->desc_state_.scheduler_->reset_inline_budget();
43
44	81311x	if (op.cancelled.load(std::memory_order_acquire))
45	306x	*op.ec_out = capy::error::canceled;
46	81005x	else if (op.errn != 0)
47	✗	*op.ec_out = make_err(op.errn);
48	81005x	else if (op.is_read_operation() && op.bytes_transferred == 0)
49	✗	*op.ec_out = capy::error::eof;
50		else
51	81005x	*op.ec_out = {};
52
53	81311x	*op.bytes_out = op.bytes_transferred;
54
55	81311x	op.cont_op.cont.h = op.h;
56	81311x	capy::executor_ref saved_ex(op.ex);
57	81311x	auto prevent = std::move(op.impl_ptr);
58	81311x	dispatch_coro(saved_ex, op.cont_op.cont).resume();
59	81311x	}
60
61		/** Complete a datagram recv operation (connected mode).
62
63		Like complete_io_op but does not translate zero bytes into
64		EOF. Zero-length datagrams are valid and should be reported
65		as success with 0 bytes transferred.
66
67		@param op The operation to complete.
68		*/
69		template<typename Op>
70		void
71	2x	complete_dgram_recv_op(Op& op)
72		{
73	2x	op.stop_cb.reset();
74	2x	op.socket_impl_->desc_state_.scheduler_->reset_inline_budget();
75
76	2x	if (op.cancelled.load(std::memory_order_acquire))
77	✗	*op.ec_out = capy::error::canceled;
78	2x	else if (op.errn != 0)
79	✗	*op.ec_out = make_err(op.errn);
80		else
81	2x	*op.ec_out = {};
82
83	2x	*op.bytes_out = op.bytes_transferred;
84
85	2x	op.cont_op.cont.h = op.h;
86	2x	capy::executor_ref saved_ex(op.ex);
87	2x	auto prevent = std::move(op.impl_ptr);
88	2x	dispatch_coro(saved_ex, op.cont_op.cont).resume();
89	2x	}
90
91		/** Complete a connect operation with endpoint caching.
92
93		On success, queries the local endpoint via getsockname and
94		caches both endpoints in the socket impl. Then resumes the
95		caller via symmetric transfer.
96
97		@tparam Op The concrete connect operation type.
98		@param op The operation to complete.
99		*/
100		template<typename Op>
101		void
102	6564x	complete_connect_op(Op& op)
103		{
104	6564x	op.stop_cb.reset();
105	6564x	op.socket_impl_->desc_state_.scheduler_->reset_inline_budget();
106
107	6564x	bool success =
108	6564x	(op.errn == 0 && !op.cancelled.load(std::memory_order_acquire));
109
110	6564x	if (success && op.socket_impl_)
111		{
112		using ep_type = decltype(op.target_endpoint);
113	6559x	ep_type local_ep;
114	6559x	sockaddr_storage local_storage{};
115	6559x	socklen_t local_len = sizeof(local_storage);
116	6559x	if (::getsockname(
117		op.fd, reinterpret_cast<sockaddr*>(&local_storage),
118	6559x	&local_len) == 0)
119	6555x	local_ep =
120	6559x	from_sockaddr_as(local_storage, local_len, ep_type{});
121	6559x	op.socket_impl_->set_endpoints(local_ep, op.target_endpoint);
122		}
123
124	6564x	if (op.cancelled.load(std::memory_order_acquire))
125	✗	*op.ec_out = capy::error::canceled;
126	6564x	else if (op.errn != 0)
127	5x	*op.ec_out = make_err(op.errn);
128		else
129	6559x	*op.ec_out = {};
130
131	6564x	op.cont_op.cont.h = op.h;
132	6564x	capy::executor_ref saved_ex(op.ex);
133	6564x	auto prevent = std::move(op.impl_ptr);
134	6564x	dispatch_coro(saved_ex, op.cont_op.cont).resume();
135	6564x	}
136
137		/** Construct and register a peer socket from an accepted fd.
138
139		Creates a new socket impl via the acceptor's associated
140		socket service, registers it with the scheduler, and caches
141		the local and remote endpoints.
142
143		@tparam SocketImpl The concrete socket implementation type.
144		@tparam AcceptorImpl The concrete acceptor implementation type.
145		@param acceptor_impl The acceptor that accepted the connection.
146		@param accepted_fd The accepted file descriptor (set to -1 on success).
147		@param peer_storage The peer address from accept().
148		@param impl_out Output pointer for the new socket impl.
149		@param ec_out Output pointer for any error.
150		@return True on success, false on failure.
151		*/
152		template<typename SocketImpl, typename AcceptorImpl>
153		bool
154	6549x	setup_accepted_socket(
155		AcceptorImpl* acceptor_impl,
156		int& accepted_fd,
157		sockaddr_storage const& peer_storage,
158		socklen_t peer_addrlen,
159		io_object::implementation** impl_out,
160		std::error_code* ec_out)
161		{
162	6549x	auto* socket_svc = acceptor_impl->service().stream_service();
163	6549x	if (!socket_svc)
164		{
165	✗	*ec_out = make_err(ENOENT);
166	✗	return false;
167		}
168
169	6549x	auto& impl = static_cast<SocketImpl&>(*socket_svc->construct());
170	6549x	impl.set_socket(accepted_fd);
171
172	6549x	impl.desc_state_.fd = accepted_fd;
173		{
174	6549x	std::lock_guard lock(impl.desc_state_.mutex);
175	6549x	impl.desc_state_.read_op = nullptr;
176	6549x	impl.desc_state_.write_op = nullptr;
177	6549x	impl.desc_state_.connect_op = nullptr;
178	6549x	}
179	6549x	socket_svc->scheduler().register_descriptor(accepted_fd, &impl.desc_state_);
180
181		using ep_type = decltype(acceptor_impl->local_endpoint());
182	6549x	impl.set_endpoints(
183		acceptor_impl->local_endpoint(),
184	6549x	from_sockaddr_as(
185		peer_storage,
186		peer_addrlen,
187		ep_type{}));
188
189	6549x	if (impl_out)
190	6549x	*impl_out = &impl;
191	6549x	accepted_fd = -1;
192	6549x	return true;
193		}
194
195		/** Complete an accept operation.
196
197		Sets up the peer socket on success, or closes the accepted
198		fd on failure. Then resumes the caller via symmetric transfer.
199
200		@tparam SocketImpl The concrete socket implementation type.
201		@tparam Op The concrete accept operation type.
202		@param op The operation to complete.
203		*/
204		template<typename SocketImpl, typename Op>
205		void
206	6561x	complete_accept_op(Op& op)
207		{
208	6561x	op.stop_cb.reset();
209	6561x	op.acceptor_impl_->desc_state_.scheduler_->reset_inline_budget();
210
211	6561x	bool success =
212	6561x	(op.errn == 0 && !op.cancelled.load(std::memory_order_acquire));
213
214	6561x	if (op.cancelled.load(std::memory_order_acquire))
215	12x	*op.ec_out = capy::error::canceled;
216	6549x	else if (op.errn != 0)
217	✗	*op.ec_out = make_err(op.errn);
218		else
219	6549x	*op.ec_out = {};
220
221	6561x	if (success && op.accepted_fd >= 0 && op.acceptor_impl_)
222		{
223	6549x	if (!setup_accepted_socket<SocketImpl>(
224	6549x	op.acceptor_impl_, op.accepted_fd, op.peer_storage,
225		op.peer_addrlen, op.impl_out, op.ec_out))
226	✗	success = false;
227		}
228
229	6561x	if (!success \|\| !op.acceptor_impl_)
230		{
231	12x	if (op.accepted_fd >= 0)
232		{
233	✗	::close(op.accepted_fd);
234	✗	op.accepted_fd = -1;
235		}
236	12x	if (op.impl_out)
237	12x	*op.impl_out = nullptr;
238		}
239
240	6561x	op.cont_op.cont.h = op.h;
241	6561x	capy::executor_ref saved_ex(op.ex);
242	6561x	auto prevent = std::move(op.impl_ptr);
243	6561x	dispatch_coro(saved_ex, op.cont_op.cont).resume();
244	6561x	}
245
246		/** Complete a datagram operation (send_to or recv_from).
247
248		For recv_from operations, writes the source endpoint from the
249		recorded sockaddr_storage into the caller's endpoint pointer.
250		Then resumes the caller via symmetric transfer.
251
252		@tparam Op The concrete datagram operation type.
253		@param op The operation to complete.
254		@param source_out Optional pointer to store source endpoint
255		(non-null for recv_from, null for send_to).
256		*/
257		template<typename Op, typename Endpoint>
258		void
259	18x	complete_datagram_op(Op& op, Endpoint* source_out)
260		{
261	18x	op.stop_cb.reset();
262	18x	op.socket_impl_->desc_state_.scheduler_->reset_inline_budget();
263
264	18x	if (op.cancelled.load(std::memory_order_acquire))
265	6x	*op.ec_out = capy::error::canceled;
266	12x	else if (op.errn != 0)
267	✗	*op.ec_out = make_err(op.errn);
268		else
269	12x	*op.ec_out = {};
270
271	18x	*op.bytes_out = op.bytes_transferred;
272
273	28x	if (source_out && !op.cancelled.load(std::memory_order_acquire) &&
274	10x	op.errn == 0)
275	20x	*source_out = from_sockaddr_as(
276	10x	op.source_storage,
277		op.source_addrlen,
278		Endpoint{});
279
280	18x	op.cont_op.cont.h = op.h;
281	18x	capy::executor_ref saved_ex(op.ex);
282	18x	auto prevent = std::move(op.impl_ptr);
283	18x	dispatch_coro(saved_ex, op.cont_op.cont).resume();
284	18x	}
285
286		} // namespace boost::corosio::detail
287
288		#endif // BOOST_COROSIO_NATIVE_DETAIL_REACTOR_REACTOR_OP_COMPLETE_HPP
289