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	88639x	complete_io_op(Op& op)
40		{
41	88639x	op.stop_cb.reset();
42	88639x	op.socket_impl_->desc_state_.scheduler_->reset_inline_budget();
43
44	88639x	if (op.cancelled.load(std::memory_order_acquire))
45	307x	*op.ec_out = capy::error::canceled;
46	88332x	else if (op.errn != 0)
47	✗	*op.ec_out = make_err(op.errn);
48	88332x	else if (op.is_read_operation() && op.bytes_transferred == 0)
49	✗	*op.ec_out = capy::error::eof;
50		else
51	88332x	*op.ec_out = {};
52
53	88639x	*op.bytes_out = op.bytes_transferred;
54
55	88639x	capy::executor_ref saved_ex(op.ex);
56	88639x	std::coroutine_handle<> saved_h(op.h);
57	88639x	auto prevent = std::move(op.impl_ptr);
58	88639x	dispatch_coro(saved_ex, saved_h).resume();
59	88639x	}
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	7993x	complete_connect_op(Op& op)
73		{
74	7993x	op.stop_cb.reset();
75	7993x	op.socket_impl_->desc_state_.scheduler_->reset_inline_budget();
76
77	7993x	bool success =
78	7993x	(op.errn == 0 && !op.cancelled.load(std::memory_order_acquire));
79
80	7993x	if (success && op.socket_impl_)
81		{
82	7989x	endpoint local_ep;
83	7989x	sockaddr_storage local_storage{};
84	7989x	socklen_t local_len = sizeof(local_storage);
85	7989x	if (::getsockname(
86		op.fd, reinterpret_cast<sockaddr*>(&local_storage),
87	7989x	&local_len) == 0)
88	7989x	local_ep = from_sockaddr(local_storage);
89	7989x	op.socket_impl_->set_endpoints(local_ep, op.target_endpoint);
90		}
91
92	7993x	if (op.cancelled.load(std::memory_order_acquire))
93	✗	*op.ec_out = capy::error::canceled;
94	7993x	else if (op.errn != 0)
95	4x	*op.ec_out = make_err(op.errn);
96		else
97	7989x	*op.ec_out = {};
98
99	7993x	capy::executor_ref saved_ex(op.ex);
100	7993x	std::coroutine_handle<> saved_h(op.h);
101	7993x	auto prevent = std::move(op.impl_ptr);
102	7993x	dispatch_coro(saved_ex, saved_h).resume();
103	7993x	}
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	7979x	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	7979x	auto* socket_svc = acceptor_impl->service().tcp_service();
130	7979x	if (!socket_svc)
131		{
132	✗	*ec_out = make_err(ENOENT);
133	✗	return false;
134		}
135
136	7979x	auto& impl = static_cast<SocketImpl&>(*socket_svc->construct());
137	7979x	impl.set_socket(accepted_fd);
138
139	7979x	impl.desc_state_.fd = accepted_fd;
140		{
141	7979x	std::lock_guard lock(impl.desc_state_.mutex);
142	7979x	impl.desc_state_.read_op = nullptr;
143	7979x	impl.desc_state_.write_op = nullptr;
144	7979x	impl.desc_state_.connect_op = nullptr;
145	7979x	}
146	7979x	socket_svc->scheduler().register_descriptor(accepted_fd, &impl.desc_state_);
147
148	7979x	impl.set_endpoints(
149		acceptor_impl->local_endpoint(), from_sockaddr(peer_storage));
150
151	7979x	if (impl_out)
152	7979x	*impl_out = &impl;
153	7979x	accepted_fd = -1;
154	7979x	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	7991x	complete_accept_op(Op& op)
169		{
170	7991x	op.stop_cb.reset();
171	7991x	op.acceptor_impl_->desc_state_.scheduler_->reset_inline_budget();
172
173	7991x	bool success =
174	7991x	(op.errn == 0 && !op.cancelled.load(std::memory_order_acquire));
175
176	7991x	if (op.cancelled.load(std::memory_order_acquire))
177	12x	*op.ec_out = capy::error::canceled;
178	7979x	else if (op.errn != 0)
179	✗	*op.ec_out = make_err(op.errn);
180		else
181	7979x	*op.ec_out = {};
182
183	7991x	if (success && op.accepted_fd >= 0 && op.acceptor_impl_)
184		{
185	7979x	if (!setup_accepted_socket<SocketImpl>(
186	7979x	op.acceptor_impl_, op.accepted_fd, op.peer_storage, op.impl_out,
187		op.ec_out))
188	✗	success = false;
189		}
190
191	7991x	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	7991x	capy::executor_ref saved_ex(op.ex);
203	7991x	std::coroutine_handle<> saved_h(op.h);
204	7991x	auto prevent = std::move(op.impl_ptr);
205	7991x	dispatch_coro(saved_ex, saved_h).resume();
206	7991x	}
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