ceph/src/boost/boost/asio/detail/reactive_socket_service_base.hpp

   1 //
   2 // detail/reactive_socket_service_base.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #ifndef BOOST_ASIO_DETAIL_REACTIVE_SOCKET_SERVICE_BASE_HPP
  12 #define BOOST_ASIO_DETAIL_REACTIVE_SOCKET_SERVICE_BASE_HPP
  13
  14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  15 # pragma once
  16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  17
  18 #include <boost/asio/detail/config.hpp>
  19
  20 #if !defined(BOOST_ASIO_HAS_IOCP) \
  21   && !defined(BOOST_ASIO_WINDOWS_RUNTIME)
  22
  23 #include <boost/asio/buffer.hpp>
  24 #include <boost/asio/error.hpp>
  25 #include <boost/asio/execution_context.hpp>
  26 #include <boost/asio/socket_base.hpp>
  27 #include <boost/asio/detail/buffer_sequence_adapter.hpp>
  28 #include <boost/asio/detail/memory.hpp>
  29 #include <boost/asio/detail/reactive_null_buffers_op.hpp>
  30 #include <boost/asio/detail/reactive_socket_recv_op.hpp>
  31 #include <boost/asio/detail/reactive_socket_recvmsg_op.hpp>
  32 #include <boost/asio/detail/reactive_socket_send_op.hpp>
  33 #include <boost/asio/detail/reactive_wait_op.hpp>
  34 #include <boost/asio/detail/reactor.hpp>
  35 #include <boost/asio/detail/reactor_op.hpp>
  36 #include <boost/asio/detail/socket_holder.hpp>
  37 #include <boost/asio/detail/socket_ops.hpp>
  38 #include <boost/asio/detail/socket_types.hpp>
  39
  40 #include <boost/asio/detail/push_options.hpp>
  41
  42 namespace boost {
  43 namespace asio {
  44 namespace detail {
  45
  46 class reactive_socket_service_base
  47 {
  48 public:
  49   // The native type of a socket.
  50   typedef socket_type native_handle_type;
  51
  52   // The implementation type of the socket.
  53   struct base_implementation_type
  54   {
  55     // The native socket representation.
  56     socket_type socket_;
  57
  58     // The current state of the socket.
  59     socket_ops::state_type state_;
  60
  61     // Per-descriptor data used by the reactor.
  62     reactor::per_descriptor_data reactor_data_;
  63   };
  64
  65   // Constructor.
  66   BOOST_ASIO_DECL reactive_socket_service_base(execution_context& context);
  67
  68   // Destroy all user-defined handler objects owned by the service.
  69   BOOST_ASIO_DECL void base_shutdown();
  70
  71   // Construct a new socket implementation.
  72   BOOST_ASIO_DECL void construct(base_implementation_type& impl);
  73
  74   // Move-construct a new socket implementation.
  75   BOOST_ASIO_DECL void base_move_construct(base_implementation_type& impl,
  76       base_implementation_type& other_impl) BOOST_ASIO_NOEXCEPT;
  77
  78   // Move-assign from another socket implementation.
  79   BOOST_ASIO_DECL void base_move_assign(base_implementation_type& impl,
  80       reactive_socket_service_base& other_service,
  81       base_implementation_type& other_impl);
  82
  83   // Destroy a socket implementation.
  84   BOOST_ASIO_DECL void destroy(base_implementation_type& impl);
  85
  86   // Determine whether the socket is open.
  87   bool is_open(const base_implementation_type& impl) const
  88   {
  89     return impl.socket_ != invalid_socket;
  90   }
  91
  92   // Destroy a socket implementation.
  93   BOOST_ASIO_DECL boost::system::error_code close(
  94       base_implementation_type& impl, boost::system::error_code& ec);
  95
  96   // Release ownership of the socket.
  97   BOOST_ASIO_DECL socket_type release(
  98       base_implementation_type& impl, boost::system::error_code& ec);
  99
 100   // Get the native socket representation.
 101   native_handle_type native_handle(base_implementation_type& impl)
 102   {
 103     return impl.socket_;
 104   }
 105
 106   // Cancel all operations associated with the socket.
 107   BOOST_ASIO_DECL boost::system::error_code cancel(
 108       base_implementation_type& impl, boost::system::error_code& ec);
 109
 110   // Determine whether the socket is at the out-of-band data mark.
 111   bool at_mark(const base_implementation_type& impl,
 112       boost::system::error_code& ec) const
 113   {
 114     return socket_ops::sockatmark(impl.socket_, ec);
 115   }
 116
 117   // Determine the number of bytes available for reading.
 118   std::size_t available(const base_implementation_type& impl,
 119       boost::system::error_code& ec) const
 120   {
 121     return socket_ops::available(impl.socket_, ec);
 122   }
 123
 124   // Place the socket into the state where it will listen for new connections.
 125   boost::system::error_code listen(base_implementation_type& impl,
 126       int backlog, boost::system::error_code& ec)
 127   {
 128     socket_ops::listen(impl.socket_, backlog, ec);
 129     return ec;
 130   }
 131
 132   // Perform an IO control command on the socket.
 133   template <typename IO_Control_Command>
 134   boost::system::error_code io_control(base_implementation_type& impl,
 135       IO_Control_Command& command, boost::system::error_code& ec)
 136   {
 137     socket_ops::ioctl(impl.socket_, impl.state_, command.name(),
 138         static_cast<ioctl_arg_type*>(command.data()), ec);
 139     return ec;
 140   }
 141
 142   // Gets the non-blocking mode of the socket.
 143   bool non_blocking(const base_implementation_type& impl) const
 144   {
 145     return (impl.state_ & socket_ops::user_set_non_blocking) != 0;
 146   }
 147
 148   // Sets the non-blocking mode of the socket.
 149   boost::system::error_code non_blocking(base_implementation_type& impl,
 150       bool mode, boost::system::error_code& ec)
 151   {
 152     socket_ops::set_user_non_blocking(impl.socket_, impl.state_, mode, ec);
 153     return ec;
 154   }
 155
 156   // Gets the non-blocking mode of the native socket implementation.
 157   bool native_non_blocking(const base_implementation_type& impl) const
 158   {
 159     return (impl.state_ & socket_ops::internal_non_blocking) != 0;
 160   }
 161
 162   // Sets the non-blocking mode of the native socket implementation.
 163   boost::system::error_code native_non_blocking(base_implementation_type& impl,
 164       bool mode, boost::system::error_code& ec)
 165   {
 166     socket_ops::set_internal_non_blocking(impl.socket_, impl.state_, mode, ec);
 167     return ec;
 168   }
 169
 170   // Wait for the socket to become ready to read, ready to write, or to have
 171   // pending error conditions.
 172   boost::system::error_code wait(base_implementation_type& impl,
 173       socket_base::wait_type w, boost::system::error_code& ec)
 174   {
 175     switch (w)
 176     {
 177     case socket_base::wait_read:
 178       socket_ops::poll_read(impl.socket_, impl.state_, -1, ec);
 179       break;
 180     case socket_base::wait_write:
 181       socket_ops::poll_write(impl.socket_, impl.state_, -1, ec);
 182       break;
 183     case socket_base::wait_error:
 184       socket_ops::poll_error(impl.socket_, impl.state_, -1, ec);
 185       break;
 186     default:
 187       ec = boost::asio::error::invalid_argument;
 188       break;
 189     }
 190
 191     return ec;
 192   }
 193
 194   // Asynchronously wait for the socket to become ready to read, ready to
 195   // write, or to have pending error conditions.
 196   template <typename Handler, typename IoExecutor>
 197   void async_wait(base_implementation_type& impl,
 198       socket_base::wait_type w, Handler& handler, const IoExecutor& io_ex)
 199   {
 200     bool is_continuation =
 201       boost_asio_handler_cont_helpers::is_continuation(handler);
 202
 203     // Allocate and construct an operation to wrap the handler.
 204     typedef reactive_wait_op<Handler, IoExecutor> op;
 205     typename op::ptr p = { boost::asio::detail::addressof(handler),
 206       op::ptr::allocate(handler), 0 };
 207     p.p = new (p.v) op(success_ec_, handler, io_ex);
 208
 209     BOOST_ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "socket",
 210           &impl, impl.socket_, "async_wait"));
 211
 212     int op_type;
 213     switch (w)
 214     {
 215       case socket_base::wait_read:
 216         op_type = reactor::read_op;
 217         break;
 218       case socket_base::wait_write:
 219         op_type = reactor::write_op;
 220         break;
 221       case socket_base::wait_error:
 222         op_type = reactor::except_op;
 223         break;
 224       default:
 225         p.p->ec_ = boost::asio::error::invalid_argument;
 226         reactor_.post_immediate_completion(p.p, is_continuation);
 227         p.v = p.p = 0;
 228         return;
 229     }
 230
 231     start_op(impl, op_type, p.p, is_continuation, false, false);
 232     p.v = p.p = 0;
 233   }
 234
 235   // Send the given data to the peer.
 236   template <typename ConstBufferSequence>
 237   size_t send(base_implementation_type& impl,
 238       const ConstBufferSequence& buffers,
 239       socket_base::message_flags flags, boost::system::error_code& ec)
 240   {
 241     typedef buffer_sequence_adapter<boost::asio::const_buffer,
 242         ConstBufferSequence> bufs_type;
 243
 244     if (bufs_type::is_single_buffer)
 245     {
 246       return socket_ops::sync_send1(impl.socket_,
 247           impl.state_, bufs_type::first(buffers).data(),
 248           bufs_type::first(buffers).size(), flags, ec);
 249     }
 250     else
 251     {
 252       bufs_type bufs(buffers);
 253       return socket_ops::sync_send(impl.socket_, impl.state_,
 254           bufs.buffers(), bufs.count(), flags, bufs.all_empty(), ec);
 255     }
 256   }
 257
 258   // Wait until data can be sent without blocking.
 259   size_t send(base_implementation_type& impl, const null_buffers&,
 260       socket_base::message_flags, boost::system::error_code& ec)
 261   {
 262     // Wait for socket to become ready.
 263     socket_ops::poll_write(impl.socket_, impl.state_, -1, ec);
 264
 265     return 0;
 266   }
 267
 268   // Start an asynchronous send. The data being sent must be valid for the
 269   // lifetime of the asynchronous operation.
 270   template <typename ConstBufferSequence, typename Handler, typename IoExecutor>
 271   void async_send(base_implementation_type& impl,
 272       const ConstBufferSequence& buffers, socket_base::message_flags flags,
 273       Handler& handler, const IoExecutor& io_ex)
 274   {
 275     bool is_continuation =
 276       boost_asio_handler_cont_helpers::is_continuation(handler);
 277
 278     // Allocate and construct an operation to wrap the handler.
 279     typedef reactive_socket_send_op<
 280         ConstBufferSequence, Handler, IoExecutor> op;
 281     typename op::ptr p = { boost::asio::detail::addressof(handler),
 282       op::ptr::allocate(handler), 0 };
 283     p.p = new (p.v) op(success_ec_, impl.socket_,
 284         impl.state_, buffers, flags, handler, io_ex);
 285
 286     BOOST_ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "socket",
 287           &impl, impl.socket_, "async_send"));
 288
 289     start_op(impl, reactor::write_op, p.p, is_continuation, true,
 290         ((impl.state_ & socket_ops::stream_oriented)
 291           && buffer_sequence_adapter<boost::asio::const_buffer,
 292             ConstBufferSequence>::all_empty(buffers)));
 293     p.v = p.p = 0;
 294   }
 295
 296   // Start an asynchronous wait until data can be sent without blocking.
 297   template <typename Handler, typename IoExecutor>
 298   void async_send(base_implementation_type& impl, const null_buffers&,
 299       socket_base::message_flags, Handler& handler, const IoExecutor& io_ex)
 300   {
 301     bool is_continuation =
 302       boost_asio_handler_cont_helpers::is_continuation(handler);
 303
 304     // Allocate and construct an operation to wrap the handler.
 305     typedef reactive_null_buffers_op<Handler, IoExecutor> op;
 306     typename op::ptr p = { boost::asio::detail::addressof(handler),
 307       op::ptr::allocate(handler), 0 };
 308     p.p = new (p.v) op(success_ec_, handler, io_ex);
 309
 310     BOOST_ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "socket",
 311           &impl, impl.socket_, "async_send(null_buffers)"));
 312
 313     start_op(impl, reactor::write_op, p.p, is_continuation, false, false);
 314     p.v = p.p = 0;
 315   }
 316
 317   // Receive some data from the peer. Returns the number of bytes received.
 318   template <typename MutableBufferSequence>
 319   size_t receive(base_implementation_type& impl,
 320       const MutableBufferSequence& buffers,
 321       socket_base::message_flags flags, boost::system::error_code& ec)
 322   {
 323     typedef buffer_sequence_adapter<boost::asio::mutable_buffer,
 324         MutableBufferSequence> bufs_type;
 325
 326     if (bufs_type::is_single_buffer)
 327     {
 328       return socket_ops::sync_recv1(impl.socket_,
 329           impl.state_, bufs_type::first(buffers).data(),
 330           bufs_type::first(buffers).size(), flags, ec);
 331     }
 332     else
 333     {
 334       bufs_type bufs(buffers);
 335       return socket_ops::sync_recv(impl.socket_, impl.state_,
 336           bufs.buffers(), bufs.count(), flags, bufs.all_empty(), ec);
 337     }
 338   }
 339
 340   // Wait until data can be received without blocking.
 341   size_t receive(base_implementation_type& impl, const null_buffers&,
 342       socket_base::message_flags, boost::system::error_code& ec)
 343   {
 344     // Wait for socket to become ready.
 345     socket_ops::poll_read(impl.socket_, impl.state_, -1, ec);
 346
 347     return 0;
 348   }
 349
 350   // Start an asynchronous receive. The buffer for the data being received
 351   // must be valid for the lifetime of the asynchronous operation.
 352   template <typename MutableBufferSequence,
 353       typename Handler, typename IoExecutor>
 354   void async_receive(base_implementation_type& impl,
 355       const MutableBufferSequence& buffers, socket_base::message_flags flags,
 356       Handler& handler, const IoExecutor& io_ex)
 357   {
 358     bool is_continuation =
 359       boost_asio_handler_cont_helpers::is_continuation(handler);
 360
 361     // Allocate and construct an operation to wrap the handler.
 362     typedef reactive_socket_recv_op<
 363         MutableBufferSequence, Handler, IoExecutor> op;
 364     typename op::ptr p = { boost::asio::detail::addressof(handler),
 365       op::ptr::allocate(handler), 0 };
 366     p.p = new (p.v) op(success_ec_, impl.socket_,
 367         impl.state_, buffers, flags, handler, io_ex);
 368
 369     BOOST_ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "socket",
 370           &impl, impl.socket_, "async_receive"));
 371
 372     start_op(impl,
 373         (flags & socket_base::message_out_of_band)
 374           ? reactor::except_op : reactor::read_op,
 375         p.p, is_continuation,
 376         (flags & socket_base::message_out_of_band) == 0,
 377         ((impl.state_ & socket_ops::stream_oriented)
 378           && buffer_sequence_adapter<boost::asio::mutable_buffer,
 379             MutableBufferSequence>::all_empty(buffers)));
 380     p.v = p.p = 0;
 381   }
 382
 383   // Wait until data can be received without blocking.
 384   template <typename Handler, typename IoExecutor>
 385   void async_receive(base_implementation_type& impl,
 386       const null_buffers&, socket_base::message_flags flags,
 387       Handler& handler, const IoExecutor& io_ex)
 388   {
 389     bool is_continuation =
 390       boost_asio_handler_cont_helpers::is_continuation(handler);
 391
 392     // Allocate and construct an operation to wrap the handler.
 393     typedef reactive_null_buffers_op<Handler, IoExecutor> op;
 394     typename op::ptr p = { boost::asio::detail::addressof(handler),
 395       op::ptr::allocate(handler), 0 };
 396     p.p = new (p.v) op(success_ec_, handler, io_ex);
 397
 398     BOOST_ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "socket",
 399           &impl, impl.socket_, "async_receive(null_buffers)"));
 400
 401     start_op(impl,
 402         (flags & socket_base::message_out_of_band)
 403           ? reactor::except_op : reactor::read_op,
 404         p.p, is_continuation, false, false);
 405     p.v = p.p = 0;
 406   }
 407
 408   // Receive some data with associated flags. Returns the number of bytes
 409   // received.
 410   template <typename MutableBufferSequence>
 411   size_t receive_with_flags(base_implementation_type& impl,
 412       const MutableBufferSequence& buffers,
 413       socket_base::message_flags in_flags,
 414       socket_base::message_flags& out_flags, boost::system::error_code& ec)
 415   {
 416     buffer_sequence_adapter<boost::asio::mutable_buffer,
 417         MutableBufferSequence> bufs(buffers);
 418
 419     return socket_ops::sync_recvmsg(impl.socket_, impl.state_,
 420         bufs.buffers(), bufs.count(), in_flags, out_flags, ec);
 421   }
 422
 423   // Wait until data can be received without blocking.
 424   size_t receive_with_flags(base_implementation_type& impl,
 425       const null_buffers&, socket_base::message_flags,
 426       socket_base::message_flags& out_flags, boost::system::error_code& ec)
 427   {
 428     // Wait for socket to become ready.
 429     socket_ops::poll_read(impl.socket_, impl.state_, -1, ec);
 430
 431     // Clear out_flags, since we cannot give it any other sensible value when
 432     // performing a null_buffers operation.
 433     out_flags = 0;
 434
 435     return 0;
 436   }
 437
 438   // Start an asynchronous receive. The buffer for the data being received
 439   // must be valid for the lifetime of the asynchronous operation.
 440   template <typename MutableBufferSequence,
 441       typename Handler, typename IoExecutor>
 442   void async_receive_with_flags(base_implementation_type& impl,
 443       const MutableBufferSequence& buffers, socket_base::message_flags in_flags,
 444       socket_base::message_flags& out_flags, Handler& handler,
 445       const IoExecutor& io_ex)
 446   {
 447     bool is_continuation =
 448       boost_asio_handler_cont_helpers::is_continuation(handler);
 449
 450     // Allocate and construct an operation to wrap the handler.
 451     typedef reactive_socket_recvmsg_op<
 452         MutableBufferSequence, Handler, IoExecutor> op;
 453     typename op::ptr p = { boost::asio::detail::addressof(handler),
 454       op::ptr::allocate(handler), 0 };
 455     p.p = new (p.v) op(success_ec_, impl.socket_,
 456         buffers, in_flags, out_flags, handler, io_ex);
 457
 458     BOOST_ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "socket",
 459           &impl, impl.socket_, "async_receive_with_flags"));
 460
 461     start_op(impl,
 462         (in_flags & socket_base::message_out_of_band)
 463           ? reactor::except_op : reactor::read_op,
 464         p.p, is_continuation,
 465         (in_flags & socket_base::message_out_of_band) == 0, false);
 466     p.v = p.p = 0;
 467   }
 468
 469   // Wait until data can be received without blocking.
 470   template <typename Handler, typename IoExecutor>
 471   void async_receive_with_flags(base_implementation_type& impl,
 472       const null_buffers&, socket_base::message_flags in_flags,
 473       socket_base::message_flags& out_flags, Handler& handler,
 474       const IoExecutor& io_ex)
 475   {
 476     bool is_continuation =
 477       boost_asio_handler_cont_helpers::is_continuation(handler);
 478
 479     // Allocate and construct an operation to wrap the handler.
 480     typedef reactive_null_buffers_op<Handler, IoExecutor> op;
 481     typename op::ptr p = { boost::asio::detail::addressof(handler),
 482       op::ptr::allocate(handler), 0 };
 483     p.p = new (p.v) op(success_ec_, handler, io_ex);
 484
 485     BOOST_ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "socket",
 486           &impl, impl.socket_, "async_receive_with_flags(null_buffers)"));
 487
 488     // Clear out_flags, since we cannot give it any other sensible value when
 489     // performing a null_buffers operation.
 490     out_flags = 0;
 491
 492     start_op(impl,
 493         (in_flags & socket_base::message_out_of_band)
 494           ? reactor::except_op : reactor::read_op,
 495         p.p, is_continuation, false, false);
 496     p.v = p.p = 0;
 497   }
 498
 499 protected:
 500   // Open a new socket implementation.
 501   BOOST_ASIO_DECL boost::system::error_code do_open(
 502       base_implementation_type& impl, int af,
 503       int type, int protocol, boost::system::error_code& ec);
 504
 505   // Assign a native socket to a socket implementation.
 506   BOOST_ASIO_DECL boost::system::error_code do_assign(
 507       base_implementation_type& impl, int type,
 508       const native_handle_type& native_socket, boost::system::error_code& ec);
 509
 510   // Start the asynchronous read or write operation.
 511   BOOST_ASIO_DECL void start_op(base_implementation_type& impl, int op_type,
 512       reactor_op* op, bool is_continuation, bool is_non_blocking, bool noop);
 513
 514   // Start the asynchronous accept operation.
 515   BOOST_ASIO_DECL void start_accept_op(base_implementation_type& impl,
 516       reactor_op* op, bool is_continuation, bool peer_is_open);
 517
 518   // Start the asynchronous connect operation.
 519   BOOST_ASIO_DECL void start_connect_op(base_implementation_type& impl,
 520       reactor_op* op, bool is_continuation,
 521       const socket_addr_type* addr, size_t addrlen);
 522
 523   // The selector that performs event demultiplexing for the service.
 524   reactor& reactor_;
 525
 526   // Cached success value to avoid accessing category singleton.
 527   const boost::system::error_code success_ec_;
 528 };
 529
 530 } // namespace detail
 531 } // namespace asio
 532 } // namespace boost
 533
 534 #include <boost/asio/detail/pop_options.hpp>
 535
 536 #if defined(BOOST_ASIO_HEADER_ONLY)
 537 # include <boost/asio/detail/impl/reactive_socket_service_base.ipp>
 538 #endif // defined(BOOST_ASIO_HEADER_ONLY)
 539
 540 #endif // !defined(BOOST_ASIO_HAS_IOCP)
 541        //   && !defined(BOOST_ASIO_WINDOWS_RUNTIME)
 542
 543 #endif // BOOST_ASIO_DETAIL_REACTIVE_SOCKET_SERVICE_BASE_HPP