. /include/boost/corosio /native /native_local_stream_socket.hpp
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1   // 1   //
2   // Copyright (c) 2026 Steve Gerbino 2   // Copyright (c) 2026 Steve Gerbino
3   // Copyright (c) 2026 Michael Vandeberg 3   // Copyright (c) 2026 Michael Vandeberg
4   // 4   //
5   // Distributed under the Boost Software License, Version 1.0. (See accompanying 5   // Distributed under the Boost Software License, Version 1.0. (See accompanying
6   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7   // 7   //
8   // Official repository: https://github.com/cppalliance/corosio 8   // Official repository: https://github.com/cppalliance/corosio
9   // 9   //
10   10  
11   #ifndef BOOST_COROSIO_NATIVE_NATIVE_LOCAL_STREAM_SOCKET_HPP 11   #ifndef BOOST_COROSIO_NATIVE_NATIVE_LOCAL_STREAM_SOCKET_HPP
12   #define BOOST_COROSIO_NATIVE_NATIVE_LOCAL_STREAM_SOCKET_HPP 12   #define BOOST_COROSIO_NATIVE_NATIVE_LOCAL_STREAM_SOCKET_HPP
13   13  
14   #include <boost/corosio/local_stream_socket.hpp> 14   #include <boost/corosio/local_stream_socket.hpp>
15   #include <boost/corosio/backend.hpp> 15   #include <boost/corosio/backend.hpp>
16   16  
17   #ifndef BOOST_COROSIO_MRDOCS 17   #ifndef BOOST_COROSIO_MRDOCS
18   #if BOOST_COROSIO_HAS_EPOLL 18   #if BOOST_COROSIO_HAS_EPOLL
19   #include <boost/corosio/native/detail/epoll/epoll_types.hpp> 19   #include <boost/corosio/native/detail/epoll/epoll_types.hpp>
20   #endif 20   #endif
21   21  
22   #if BOOST_COROSIO_HAS_SELECT 22   #if BOOST_COROSIO_HAS_SELECT
23   #include <boost/corosio/native/detail/select/select_types.hpp> 23   #include <boost/corosio/native/detail/select/select_types.hpp>
24   #endif 24   #endif
25   25  
26   #if BOOST_COROSIO_HAS_KQUEUE 26   #if BOOST_COROSIO_HAS_KQUEUE
27   #include <boost/corosio/native/detail/kqueue/kqueue_types.hpp> 27   #include <boost/corosio/native/detail/kqueue/kqueue_types.hpp>
28   #endif 28   #endif
29   29  
30 - #if BOOST_COROSIO_HAS_IO_URING 30 + #if BOOST_COROSIO_HAS_URING
31 - #include <boost/corosio/native/detail/io_uring/io_uring_types.hpp> 31 + #include <boost/corosio/native/detail/uring/uring_types.hpp>
32   #endif 32   #endif
33   33  
34   #if BOOST_COROSIO_HAS_IOCP 34   #if BOOST_COROSIO_HAS_IOCP
35   #include <boost/corosio/native/detail/iocp/win_local_stream_service.hpp> 35   #include <boost/corosio/native/detail/iocp/win_local_stream_service.hpp>
36   #endif 36   #endif
37   #endif // !BOOST_COROSIO_MRDOCS 37   #endif // !BOOST_COROSIO_MRDOCS
38   38  
39   namespace boost::corosio { 39   namespace boost::corosio {
40   40  
41   /** An asynchronous Unix stream socket with devirtualized I/O operations. 41   /** An asynchronous Unix stream socket with devirtualized I/O operations.
42   42  
43   This class template inherits from @ref local_stream_socket and 43   This class template inherits from @ref local_stream_socket and
44   shadows the async operations (`read_some`, `write_some`, 44   shadows the async operations (`read_some`, `write_some`,
45   `connect`) with versions that call the backend implementation 45   `connect`) with versions that call the backend implementation
46   directly, allowing the compiler to inline through the entire 46   directly, allowing the compiler to inline through the entire
47   call chain. 47   call chain.
48   48  
49   Non-async operations (`open`, `close`, `cancel`, socket options) 49   Non-async operations (`open`, `close`, `cancel`, socket options)
50   remain unchanged and dispatch through the compiled library. 50   remain unchanged and dispatch through the compiled library.
51   51  
52   A `native_local_stream_socket` IS-A `local_stream_socket` and 52   A `native_local_stream_socket` IS-A `local_stream_socket` and
53   can be passed to any function expecting `local_stream_socket&` 53   can be passed to any function expecting `local_stream_socket&`
54   or `io_stream&`, in which case virtual dispatch is used 54   or `io_stream&`, in which case virtual dispatch is used
55   transparently. 55   transparently.
56   56  
57   @tparam Backend A backend tag value (e.g., `epoll`) whose type 57   @tparam Backend A backend tag value (e.g., `epoll`) whose type
58   provides the concrete implementation types. 58   provides the concrete implementation types.
59   59  
60   @par Thread Safety 60   @par Thread Safety
61   Same as @ref local_stream_socket. 61   Same as @ref local_stream_socket.
62   62  
63   @par Example 63   @par Example
64   @par !example connect 64   @par !example connect
65   65  
66   @see local_stream_socket, epoll_t, iocp_t 66   @see local_stream_socket, epoll_t, iocp_t
67   */ 67   */
68   template<auto Backend> 68   template<auto Backend>
69   class native_local_stream_socket : public local_stream_socket 69   class native_local_stream_socket : public local_stream_socket
70   { 70   {
71   using backend_type = decltype(Backend); 71   using backend_type = decltype(Backend);
72   using impl_type = typename backend_type::local_stream_socket_type; 72   using impl_type = typename backend_type::local_stream_socket_type;
73   using service_type = typename backend_type::local_stream_service_type; 73   using service_type = typename backend_type::local_stream_service_type;
74   74  
HITCBC 75   34 impl_type& get_impl() noexcept 75   34 impl_type& get_impl() noexcept
76   { 76   {
HITCBC 77   34 return *static_cast<impl_type*>(h_.get()); 77   34 return *static_cast<impl_type*>(h_.get());
78   } 78   }
79   79  
80   template<class MutableBufferSequence> 80   template<class MutableBufferSequence>
81   struct native_read_awaitable 81   struct native_read_awaitable
82   { 82   {
83   native_local_stream_socket& self_; 83   native_local_stream_socket& self_;
84   MutableBufferSequence buffers_; 84   MutableBufferSequence buffers_;
85   std::stop_token token_; 85   std::stop_token token_;
86   mutable std::error_code ec_; 86   mutable std::error_code ec_;
87   mutable std::size_t bytes_transferred_ = 0; 87   mutable std::size_t bytes_transferred_ = 0;
88   88  
HITCBC 89   8 native_read_awaitable( 89   8 native_read_awaitable(
90   native_local_stream_socket& self, 90   native_local_stream_socket& self,
91   MutableBufferSequence buffers) noexcept 91   MutableBufferSequence buffers) noexcept
HITCBC 92   8 : self_(self) 92   8 : self_(self)
HITCBC 93   8 , buffers_(std::move(buffers)) 93   8 , buffers_(std::move(buffers))
94   { 94   {
HITCBC 95   8 } 95   8 }
96   96  
HITCBC 97   8 bool await_ready() const noexcept 97   8 bool await_ready() const noexcept
98   { 98   {
99   // A pre-set ec_ means the initiator failed before 99   // A pre-set ec_ means the initiator failed before
100   // dispatch (e.g. a closed object). 100   // dispatch (e.g. a closed object).
HITCBC 101   8 return static_cast<bool>(ec_) || token_.stop_requested(); 101   8 return static_cast<bool>(ec_) || token_.stop_requested();
102   } 102   }
103   103  
HITCBC 104   8 [[nodiscard]] capy::io_result<std::size_t> await_resume() const noexcept 104   8 [[nodiscard]] capy::io_result<std::size_t> await_resume() const noexcept
105   { 105   {
HITCBC 106   8 if (token_.stop_requested()) 106   8 if (token_.stop_requested())
HITCBC 107   2 return {make_error_code(std::errc::operation_canceled), 0}; 107   2 return {make_error_code(std::errc::operation_canceled), 0};
HITCBC 108   6 return {ec_, bytes_transferred_}; 108   6 return {ec_, bytes_transferred_};
109   } 109   }
110   110  
HITCBC 111   8 auto await_suspend(std::coroutine_handle<> h, capy::io_env const* env) 111   8 auto await_suspend(std::coroutine_handle<> h, capy::io_env const* env)
112   -> std::coroutine_handle<> 112   -> std::coroutine_handle<>
113   { 113   {
HITCBC 114   8 token_ = env->stop_token; 114   8 token_ = env->stop_token;
HITCBC 115   24 return self_.get_impl().read_some( 115   24 return self_.get_impl().read_some(
HITCBC 116   24 h, env->executor, buffers_, token_, &ec_, &bytes_transferred_); 116   24 h, env->executor, buffers_, token_, &ec_, &bytes_transferred_);
117   } 117   }
118   }; 118   };
119   119  
120   template<class ConstBufferSequence> 120   template<class ConstBufferSequence>
121   struct native_write_awaitable 121   struct native_write_awaitable
122   { 122   {
123   native_local_stream_socket& self_; 123   native_local_stream_socket& self_;
124   ConstBufferSequence buffers_; 124   ConstBufferSequence buffers_;
125   std::stop_token token_; 125   std::stop_token token_;
126   mutable std::error_code ec_; 126   mutable std::error_code ec_;
127   mutable std::size_t bytes_transferred_ = 0; 127   mutable std::size_t bytes_transferred_ = 0;
128   128  
HITCBC 129   8 native_write_awaitable( 129   8 native_write_awaitable(
130   native_local_stream_socket& self, 130   native_local_stream_socket& self,
131   ConstBufferSequence buffers) noexcept 131   ConstBufferSequence buffers) noexcept
HITCBC 132   8 : self_(self) 132   8 : self_(self)
HITCBC 133   8 , buffers_(std::move(buffers)) 133   8 , buffers_(std::move(buffers))
134   { 134   {
HITCBC 135   8 } 135   8 }
136   136  
HITCBC 137   8 bool await_ready() const noexcept 137   8 bool await_ready() const noexcept
138   { 138   {
139   // A pre-set ec_ means the initiator failed before 139   // A pre-set ec_ means the initiator failed before
140   // dispatch (e.g. a closed object). 140   // dispatch (e.g. a closed object).
HITCBC 141   8 return static_cast<bool>(ec_) || token_.stop_requested(); 141   8 return static_cast<bool>(ec_) || token_.stop_requested();
142   } 142   }
143   143  
HITCBC 144   8 [[nodiscard]] capy::io_result<std::size_t> await_resume() const noexcept 144   8 [[nodiscard]] capy::io_result<std::size_t> await_resume() const noexcept
145   { 145   {
HITCBC 146   8 if (token_.stop_requested()) 146   8 if (token_.stop_requested())
HITCBC 147   2 return {make_error_code(std::errc::operation_canceled), 0}; 147   2 return {make_error_code(std::errc::operation_canceled), 0};
HITCBC 148   6 return {ec_, bytes_transferred_}; 148   6 return {ec_, bytes_transferred_};
149   } 149   }
150   150  
HITCBC 151   8 auto await_suspend(std::coroutine_handle<> h, capy::io_env const* env) 151   8 auto await_suspend(std::coroutine_handle<> h, capy::io_env const* env)
152   -> std::coroutine_handle<> 152   -> std::coroutine_handle<>
153   { 153   {
HITCBC 154   8 token_ = env->stop_token; 154   8 token_ = env->stop_token;
HITCBC 155   24 return self_.get_impl().write_some( 155   24 return self_.get_impl().write_some(
HITCBC 156   24 h, env->executor, buffers_, token_, &ec_, &bytes_transferred_); 156   24 h, env->executor, buffers_, token_, &ec_, &bytes_transferred_);
157   } 157   }
158   }; 158   };
159   159  
160   struct native_wait_awaitable 160   struct native_wait_awaitable
161   { 161   {
162   native_local_stream_socket& self_; 162   native_local_stream_socket& self_;
163   wait_type w_; 163   wait_type w_;
164   std::stop_token token_; 164   std::stop_token token_;
165   mutable std::error_code ec_; 165   mutable std::error_code ec_;
166   166  
HITCBC 167   6 native_wait_awaitable( 167   6 native_wait_awaitable(
168   native_local_stream_socket& self, wait_type w) noexcept 168   native_local_stream_socket& self, wait_type w) noexcept
HITCBC 169   6 : self_(self) 169   6 : self_(self)
HITCBC 170   6 , w_(w) 170   6 , w_(w)
171   { 171   {
HITCBC 172   6 } 172   6 }
173   173  
HITCBC 174   6 bool await_ready() const noexcept 174   6 bool await_ready() const noexcept
175   { 175   {
176   // A pre-set ec_ means the initiator failed before 176   // A pre-set ec_ means the initiator failed before
177   // dispatch (e.g. auto-open). 177   // dispatch (e.g. auto-open).
HITCBC 178   6 return static_cast<bool>(ec_) || token_.stop_requested(); 178   6 return static_cast<bool>(ec_) || token_.stop_requested();
179   } 179   }
180   180  
HITCBC 181   6 [[nodiscard]] capy::io_result<> await_resume() const noexcept 181   6 [[nodiscard]] capy::io_result<> await_resume() const noexcept
182   { 182   {
HITCBC 183   6 if (token_.stop_requested()) 183   6 if (token_.stop_requested())
HITCBC 184   2 return {make_error_code(std::errc::operation_canceled)}; 184   2 return {make_error_code(std::errc::operation_canceled)};
HITCBC 185   4 return {ec_}; 185   4 return {ec_};
186   } 186   }
187   187  
HITCBC 188   6 auto await_suspend(std::coroutine_handle<> h, capy::io_env const* env) 188   6 auto await_suspend(std::coroutine_handle<> h, capy::io_env const* env)
189   -> std::coroutine_handle<> 189   -> std::coroutine_handle<>
190   { 190   {
HITCBC 191   6 token_ = env->stop_token; 191   6 token_ = env->stop_token;
HITCBC 192 - 18 return self_.get_impl().wait( 192 + 6 return self_.get_impl().wait(h, env->executor, w_, token_, &ec_);
DCB 193 - 18 h, env->executor, w_, token_, &ec_);  
194   } 193   }
195   }; 194   };
196   195  
197   struct native_connect_awaitable 196   struct native_connect_awaitable
198   { 197   {
199   native_local_stream_socket& self_; 198   native_local_stream_socket& self_;
200   corosio::local_endpoint endpoint_; 199   corosio::local_endpoint endpoint_;
201   std::stop_token token_; 200   std::stop_token token_;
202   mutable std::error_code ec_; 201   mutable std::error_code ec_;
203   202  
HITCBC 204   12 native_connect_awaitable( 203   12 native_connect_awaitable(
205   native_local_stream_socket& self, 204   native_local_stream_socket& self,
206   corosio::local_endpoint ep) noexcept 205   corosio::local_endpoint ep) noexcept
HITCBC 207   12 : self_(self) 206   12 : self_(self)
HITCBC 208   12 , endpoint_(ep) 207   12 , endpoint_(ep)
209   { 208   {
HITCBC 210   12 } 209   12 }
211   210  
HITCBC 212   12 bool await_ready() const noexcept 211   12 bool await_ready() const noexcept
213   { 212   {
214   // A pre-set ec_ means the initiator failed before 213   // A pre-set ec_ means the initiator failed before
215   // dispatch (e.g. a closed object). 214   // dispatch (e.g. a closed object).
HITCBC 216   12 return static_cast<bool>(ec_) || token_.stop_requested(); 215   12 return static_cast<bool>(ec_) || token_.stop_requested();
217   } 216   }
218   217  
HITCBC 219   12 [[nodiscard]] capy::io_result<> await_resume() const noexcept 218   12 [[nodiscard]] capy::io_result<> await_resume() const noexcept
220   { 219   {
HITCBC 221   12 if (token_.stop_requested()) 220   12 if (token_.stop_requested())
HITCBC 222   2 return {make_error_code(std::errc::operation_canceled)}; 221   2 return {make_error_code(std::errc::operation_canceled)};
HITCBC 223   10 return {ec_}; 222   10 return {ec_};
224   } 223   }
225   224  
HITCBC 226   12 auto await_suspend(std::coroutine_handle<> h, capy::io_env const* env) 225   12 auto await_suspend(std::coroutine_handle<> h, capy::io_env const* env)
227   -> std::coroutine_handle<> 226   -> std::coroutine_handle<>
228   { 227   {
HITCBC 229   12 token_ = env->stop_token; 228   12 token_ = env->stop_token;
HITCBC 230   36 return self_.get_impl().connect( 229   36 return self_.get_impl().connect(
HITCBC 231   36 h, env->executor, endpoint_, token_, &ec_); 230   36 h, env->executor, endpoint_, token_, &ec_);
232   } 231   }
233   }; 232   };
234   233  
235   public: 234   public:
236   /** Construct a native socket from an execution context. 235   /** Construct a native socket from an execution context.
237   236  
238   @param ctx The execution context that will own this socket. 237   @param ctx The execution context that will own this socket.
239   */ 238   */
HITCBC 240   40 explicit native_local_stream_socket(capy::execution_context& ctx) 239   40 explicit native_local_stream_socket(capy::execution_context& ctx)
HITCBC 241   40 : io_object(create_handle<service_type>(ctx)) 240   40 : io_object(create_handle<service_type>(ctx))
242   { 241   {
HITCBC 243   40 } 242   40 }
244   243  
245   /** Construct a native socket from an executor. 244   /** Construct a native socket from an executor.
246   245  
247   @param ex The executor whose context will own the socket. 246   @param ex The executor whose context will own the socket.
248   */ 247   */
249   template<class Ex> 248   template<class Ex>
250   requires(!std::same_as< 249   requires(!std::same_as<
251 - std::remove_cvref_t<Ex>, 250 + std::remove_cvref_t<Ex>,
252 - native_local_stream_socket>) && 251 + native_local_stream_socket>) &&
253   capy::Executor<Ex> 252   capy::Executor<Ex>
254   explicit native_local_stream_socket(Ex const& ex) 253   explicit native_local_stream_socket(Ex const& ex)
255   : native_local_stream_socket(ex.context()) 254   : native_local_stream_socket(ex.context())
256   { 255   {
257   } 256   }
258   257  
259   /// Move construct. 258   /// Move construct.
HITCBC 260   6 native_local_stream_socket(native_local_stream_socket&&) noexcept = default; 259   6 native_local_stream_socket(native_local_stream_socket&&) noexcept = default;
261   260  
262   /// Move assign. 261   /// Move assign.
263   native_local_stream_socket& 262   native_local_stream_socket&
264   operator=(native_local_stream_socket&&) noexcept = default; 263   operator=(native_local_stream_socket&&) noexcept = default;
265   264  
266   native_local_stream_socket(native_local_stream_socket const&) = delete; 265   native_local_stream_socket(native_local_stream_socket const&) = delete;
267   native_local_stream_socket& 266   native_local_stream_socket&
268   operator=(native_local_stream_socket const&) = delete; 267   operator=(native_local_stream_socket const&) = delete;
269   268  
270   /** Asynchronously read data from the socket. 269   /** Asynchronously read data from the socket.
271   270  
272   Calls the backend implementation directly, bypassing virtual 271   Calls the backend implementation directly, bypassing virtual
273   dispatch. Otherwise identical to @ref io_stream::read_some. 272   dispatch. Otherwise identical to @ref io_stream::read_some.
274   273  
275   @param buffers The buffer sequence to read into. 274   @param buffers The buffer sequence to read into.
276   275  
277   @return An awaitable yielding `(error_code, std::size_t)`. 276   @return An awaitable yielding `(error_code, std::size_t)`.
278   */ 277   */
279   template<capy::MutableBufferSequence MB> 278   template<capy::MutableBufferSequence MB>
HITCBC 280   8 [[nodiscard]] auto read_some(MB const& buffers) 279   8 [[nodiscard]] auto read_some(MB const& buffers)
281   { 280   {
HITCBC 282   8 return native_read_awaitable<MB>(*this, buffers); 281   8 return native_read_awaitable<MB>(*this, buffers);
283   } 282   }
284   283  
285   /** Asynchronously write data to the socket. 284   /** Asynchronously write data to the socket.
286   285  
287   Calls the backend implementation directly, bypassing virtual 286   Calls the backend implementation directly, bypassing virtual
288   dispatch. Otherwise identical to @ref io_stream::write_some. 287   dispatch. Otherwise identical to @ref io_stream::write_some.
289   288  
290   @param buffers The buffer sequence to write from. 289   @param buffers The buffer sequence to write from.
291   290  
292   @return An awaitable yielding `(error_code, std::size_t)`. 291   @return An awaitable yielding `(error_code, std::size_t)`.
293   */ 292   */
294   template<capy::ConstBufferSequence CB> 293   template<capy::ConstBufferSequence CB>
HITCBC 295   8 [[nodiscard]] auto write_some(CB const& buffers) 294   8 [[nodiscard]] auto write_some(CB const& buffers)
296   { 295   {
HITCBC 297   8 return native_write_awaitable<CB>(*this, buffers); 296   8 return native_write_awaitable<CB>(*this, buffers);
298   } 297   }
299   298  
300   /** Asynchronously connect to a remote endpoint. 299   /** Asynchronously connect to a remote endpoint.
301   300  
302   Calls the backend implementation directly, bypassing virtual 301   Calls the backend implementation directly, bypassing virtual
303   dispatch. Otherwise identical to @ref local_stream_socket::connect. 302   dispatch. Otherwise identical to @ref local_stream_socket::connect.
304   303  
305   If the socket is not already open, it is opened automatically. 304   If the socket is not already open, it is opened automatically.
306   305  
307   @param ep The local endpoint (path) to connect to. 306   @param ep The local endpoint (path) to connect to.
308   307  
309   @return An awaitable yielding `io_result<>`. 308   @return An awaitable yielding `io_result<>`.
310   309  
311   If the socket needs to be opened and the open fails, the 310   If the socket needs to be opened and the open fails, the
312   awaitable completes immediately with that error. 311   awaitable completes immediately with that error.
313   */ 312   */
HITCBC 314   12 [[nodiscard]] auto connect(corosio::local_endpoint ep) 313   12 [[nodiscard]] auto connect(corosio::local_endpoint ep)
315   { 314   {
HITCBC 316   12 native_connect_awaitable aw(*this, ep); 315   12 native_connect_awaitable aw(*this, ep);
HITCBC 317   12 if (!is_open()) 316   12 if (!is_open())
HITCBC 318   10 aw.ec_ = open(); 317   10 aw.ec_ = open();
HITCBC 319   12 return aw; 318   12 return aw;
320   } 319   }
321   320  
322   /** Asynchronously wait for the socket to be ready. 321   /** Asynchronously wait for the socket to be ready.
323   322  
324   Calls the backend implementation directly, bypassing virtual 323   Calls the backend implementation directly, bypassing virtual
325   dispatch. Otherwise identical to @ref local_stream_socket::wait. 324   dispatch. Otherwise identical to @ref local_stream_socket::wait.
326   325  
327   @param w The wait direction (read, write, or error). 326   @param w The wait direction (read, write, or error).
328   327  
329   @return An awaitable yielding `io_result<>`. 328   @return An awaitable yielding `io_result<>`.
330   */ 329   */
HITCBC 331   6 [[nodiscard]] auto wait(wait_type w) 330   6 [[nodiscard]] auto wait(wait_type w)
332   { 331   {
HITCBC 333   6 return native_wait_awaitable(*this, w); 332   6 return native_wait_awaitable(*this, w);
334   } 333   }
335   }; 334   };
336   335  
337   } // namespace boost::corosio 336   } // namespace boost::corosio
338   337  
339   #endif // BOOST_COROSIO_NATIVE_NATIVE_LOCAL_STREAM_SOCKET_HPP 338   #endif // BOOST_COROSIO_NATIVE_NATIVE_LOCAL_STREAM_SOCKET_HPP