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	96279x	complete_io_op(Op& op)
40		{
41	96279x	op.stop_cb.reset();
42	96279x	op.socket_impl_->desc_state_.scheduler_->reset_inline_budget();
43
44	96279x	if (op.cancelled.load(std::memory_order_acquire))
45	1026x	*op.ec_out = capy::error::canceled;
46	95253x	else if (op.errn != 0)
47	4x	*op.ec_out = make_err(op.errn);
48	95249x	else if (op.is_read_operation() && op.bytes_transferred == 0)
49	✗	*op.ec_out = capy::error::eof;
50		else
51	95249x	*op.ec_out = {};
52
53	96279x	*op.bytes_out = op.bytes_transferred;
54
55	96279x	capy::executor_ref saved_ex(op.ex);
56	96279x	std::coroutine_handle<> saved_h(op.h);
57	96279x	auto prevent = std::move(op.impl_ptr);
58	96279x	dispatch_coro(saved_ex, saved_h).resume();
59	96279x	}
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	10073x	complete_connect_op(Op& op)
73		{
74	10073x	op.stop_cb.reset();
75	10073x	op.socket_impl_->desc_state_.scheduler_->reset_inline_budget();
76
77	10073x	bool success =
78	10073x	(op.errn == 0 && !op.cancelled.load(std::memory_order_acquire));
79
80	10073x	if (success && op.socket_impl_)
81		{
82	10069x	endpoint local_ep;
83	10069x	sockaddr_storage local_storage{};
84	10069x	socklen_t local_len = sizeof(local_storage);
85	10069x	if (::getsockname(
86		op.fd, reinterpret_cast<sockaddr*>(&local_storage),
87	10069x	&local_len) == 0)
88	10069x	local_ep = from_sockaddr(local_storage);
89	10069x	op.socket_impl_->set_endpoints(local_ep, op.target_endpoint);
90		}
91
92	10073x	if (op.cancelled.load(std::memory_order_acquire))
93	✗	*op.ec_out = capy::error::canceled;
94	10073x	else if (op.errn != 0)
95	4x	*op.ec_out = make_err(op.errn);
96		else
97	10069x	*op.ec_out = {};
98
99	10073x	capy::executor_ref saved_ex(op.ex);
100	10073x	std::coroutine_handle<> saved_h(op.h);
101	10073x	auto prevent = std::move(op.impl_ptr);
102	10073x	dispatch_coro(saved_ex, saved_h).resume();
103	10073x	}
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	10059x	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	10059x	auto* socket_svc = acceptor_impl->service().tcp_service();
130	10059x	if (!socket_svc)
131		{
132	✗	*ec_out = make_err(ENOENT);
133	✗	return false;
134		}
135
136	10059x	auto& impl = static_cast<SocketImpl&>(*socket_svc->construct());
137	10059x	impl.set_socket(accepted_fd);
138
139	10059x	impl.desc_state_.fd = accepted_fd;
140		{
141	10059x	std::lock_guard lock(impl.desc_state_.mutex);
142	10059x	impl.desc_state_.read_op = nullptr;
143	10059x	impl.desc_state_.write_op = nullptr;
144	10059x	impl.desc_state_.connect_op = nullptr;
145	10059x	}
146	10059x	socket_svc->scheduler().register_descriptor(accepted_fd, &impl.desc_state_);
147
148	10059x	impl.set_endpoints(
149		acceptor_impl->local_endpoint(), from_sockaddr(peer_storage));
150
151	10059x	if (impl_out)
152	10059x	*impl_out = &impl;
153	10059x	accepted_fd = -1;
154	10059x	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	10071x	complete_accept_op(Op& op)
169		{
170	10071x	op.stop_cb.reset();
171	10071x	op.acceptor_impl_->desc_state_.scheduler_->reset_inline_budget();
172
173	10071x	bool success =
174	10071x	(op.errn == 0 && !op.cancelled.load(std::memory_order_acquire));
175
176	10071x	if (op.cancelled.load(std::memory_order_acquire))
177	12x	*op.ec_out = capy::error::canceled;
178	10059x	else if (op.errn != 0)
179	✗	*op.ec_out = make_err(op.errn);
180		else
181	10059x	*op.ec_out = {};
182
183	10071x	if (success && op.accepted_fd >= 0 && op.acceptor_impl_)
184		{
185	10059x	if (!setup_accepted_socket<SocketImpl>(
186	10059x	op.acceptor_impl_, op.accepted_fd, op.peer_storage, op.impl_out,
187		op.ec_out))
188	✗	success = false;
189		}
190
191	10071x	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	10071x	capy::executor_ref saved_ex(op.ex);
203	10071x	std::coroutine_handle<> saved_h(op.h);
204	10071x	auto prevent = std::move(op.impl_ptr);
205	10071x	dispatch_coro(saved_ex, saved_h).resume();
206	10071x	}
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