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+//
+// posix/descriptor.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_POSIX_DESCRIPTOR_HPP
+#define ASIO_POSIX_DESCRIPTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if !defined(ASIO_ENABLE_OLD_SERVICES)
+
+#if defined(ASIO_HAS_POSIX_STREAM_DESCRIPTOR) \
+  || defined(GENERATING_DOCUMENTATION)
+
+#include "asio/async_result.hpp"
+#include "asio/basic_io_object.hpp"
+#include "asio/detail/handler_type_requirements.hpp"
+#include "asio/detail/reactive_descriptor_service.hpp"
+#include "asio/detail/throw_error.hpp"
+#include "asio/error.hpp"
+#include "asio/io_context.hpp"
+#include "asio/posix/descriptor_base.hpp"
+
+#if defined(ASIO_HAS_MOVE)
+# include <utility>
+#endif // defined(ASIO_HAS_MOVE)
+
+#define ASIO_SVC_T asio::detail::reactive_descriptor_service
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace posix {
+
+/// Provides POSIX descriptor functionality.
+/**
+ * The posix::descriptor class template provides the ability to wrap a
+ * POSIX descriptor.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+class descriptor
+  : ASIO_SVC_ACCESS basic_io_object<ASIO_SVC_T>,
+    public descriptor_base
+{
+public:
+  /// The type of the executor associated with the object.
+  typedef io_context::executor_type executor_type;
+
+  /// The native representation of a descriptor.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined native_handle_type;
+#else
+  typedef ASIO_SVC_T::native_handle_type native_handle_type;
+#endif
+
+  /// A descriptor is always the lowest layer.
+  typedef descriptor lowest_layer_type;
+
+  /// Construct a descriptor without opening it.
+  /**
+   * This constructor creates a descriptor without opening it.
+   *
+   * @param io_context The io_context object that the descriptor will use to
+   * dispatch handlers for any asynchronous operations performed on the
+   * descriptor.
+   */
+  explicit descriptor(asio::io_context& io_context)
+    : basic_io_object<ASIO_SVC_T>(io_context)
+  {
+  }
+
+  /// Construct a descriptor on an existing native descriptor.
+  /**
+   * This constructor creates a descriptor object to hold an existing native
+   * descriptor.
+   *
+   * @param io_context The io_context object that the descriptor will use to
+   * dispatch handlers for any asynchronous operations performed on the
+   * descriptor.
+   *
+   * @param native_descriptor A native descriptor.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  descriptor(asio::io_context& io_context,
+      const native_handle_type& native_descriptor)
+    : basic_io_object<ASIO_SVC_T>(io_context)
+  {
+    asio::error_code ec;
+    this->get_service().assign(this->get_implementation(),
+        native_descriptor, ec);
+    asio::detail::throw_error(ec, "assign");
+  }
+
+#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  /// Move-construct a descriptor from another.
+  /**
+   * This constructor moves a descriptor from one object to another.
+   *
+   * @param other The other descriptor object from which the move will
+   * occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c descriptor(io_context&) constructor.
+   */
+  descriptor(descriptor&& other)
+    : basic_io_object<ASIO_SVC_T>(std::move(other))
+  {
+  }
+
+  /// Move-assign a descriptor from another.
+  /**
+   * This assignment operator moves a descriptor from one object to another.
+   *
+   * @param other The other descriptor object from which the move will
+   * occur.
+   *
+   * @note Following the move, the moved-from object is in the same state as if
+   * constructed using the @c descriptor(io_context&) constructor.
+   */
+  descriptor& operator=(descriptor&& other)
+  {
+    basic_io_object<ASIO_SVC_T>::operator=(std::move(other));
+    return *this;
+  }
+#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+#if !defined(ASIO_NO_DEPRECATED)
+  /// (Deprecated: Use get_executor().) Get the io_context associated with the
+  /// object.
+  /**
+   * This function may be used to obtain the io_context object that the I/O
+   * object uses to dispatch handlers for asynchronous operations.
+   *
+   * @return A reference to the io_context object that the I/O object will use
+   * to dispatch handlers. Ownership is not transferred to the caller.
+   */
+  asio::io_context& get_io_context()
+  {
+    return basic_io_object<ASIO_SVC_T>::get_io_context();
+  }
+
+  /// (Deprecated: Use get_executor().) Get the io_context associated with the
+  /// object.
+  /**
+   * This function may be used to obtain the io_context object that the I/O
+   * object uses to dispatch handlers for asynchronous operations.
+   *
+   * @return A reference to the io_context object that the I/O object will use
+   * to dispatch handlers. Ownership is not transferred to the caller.
+   */
+  asio::io_context& get_io_service()
+  {
+    return basic_io_object<ASIO_SVC_T>::get_io_service();
+  }
+#endif // !defined(ASIO_NO_DEPRECATED)
+
+  /// Get the executor associated with the object.
+  executor_type get_executor() ASIO_NOEXCEPT
+  {
+    return basic_io_object<ASIO_SVC_T>::get_executor();
+  }
+
+  /// Get a reference to the lowest layer.
+  /**
+   * This function returns a reference to the lowest layer in a stack of
+   * layers. Since a descriptor cannot contain any further layers, it
+   * simply returns a reference to itself.
+   *
+   * @return A reference to the lowest layer in the stack of layers. Ownership
+   * is not transferred to the caller.
+   */
+  lowest_layer_type& lowest_layer()
+  {
+    return *this;
+  }
+
+  /// Get a const reference to the lowest layer.
+  /**
+   * This function returns a const reference to the lowest layer in a stack of
+   * layers. Since a descriptor cannot contain any further layers, it
+   * simply returns a reference to itself.
+   *
+   * @return A const reference to the lowest layer in the stack of layers.
+   * Ownership is not transferred to the caller.
+   */
+  const lowest_layer_type& lowest_layer() const
+  {
+    return *this;
+  }
+
+  /// Assign an existing native descriptor to the descriptor.
+  /*
+   * This function opens the descriptor to hold an existing native descriptor.
+   *
+   * @param native_descriptor A native descriptor.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void assign(const native_handle_type& native_descriptor)
+  {
+    asio::error_code ec;
+    this->get_service().assign(this->get_implementation(),
+        native_descriptor, ec);
+    asio::detail::throw_error(ec, "assign");
+  }
+
+  /// Assign an existing native descriptor to the descriptor.
+  /*
+   * This function opens the descriptor to hold an existing native descriptor.
+   *
+   * @param native_descriptor A native descriptor.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  ASIO_SYNC_OP_VOID assign(const native_handle_type& native_descriptor,
+      asio::error_code& ec)
+  {
+    this->get_service().assign(
+        this->get_implementation(), native_descriptor, ec);
+    ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Determine whether the descriptor is open.
+  bool is_open() const
+  {
+    return this->get_service().is_open(this->get_implementation());
+  }
+
+  /// Close the descriptor.
+  /**
+   * This function is used to close the descriptor. Any asynchronous read or
+   * write operations will be cancelled immediately, and will complete with the
+   * asio::error::operation_aborted error.
+   *
+   * @throws asio::system_error Thrown on failure. Note that, even if
+   * the function indicates an error, the underlying descriptor is closed.
+   */
+  void close()
+  {
+    asio::error_code ec;
+    this->get_service().close(this->get_implementation(), ec);
+    asio::detail::throw_error(ec, "close");
+  }
+
+  /// Close the descriptor.
+  /**
+   * This function is used to close the descriptor. Any asynchronous read or
+   * write operations will be cancelled immediately, and will complete with the
+   * asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any. Note that, even if
+   * the function indicates an error, the underlying descriptor is closed.
+   */
+  ASIO_SYNC_OP_VOID close(asio::error_code& ec)
+  {
+    this->get_service().close(this->get_implementation(), ec);
+    ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Get the native descriptor representation.
+  /**
+   * This function may be used to obtain the underlying representation of the
+   * descriptor. This is intended to allow access to native descriptor
+   * functionality that is not otherwise provided.
+   */
+  native_handle_type native_handle()
+  {
+    return this->get_service().native_handle(this->get_implementation());
+  }
+
+  /// Release ownership of the native descriptor implementation.
+  /**
+   * This function may be used to obtain the underlying representation of the
+   * descriptor. After calling this function, @c is_open() returns false. The
+   * caller is responsible for closing the descriptor.
+   *
+   * All outstanding asynchronous read or write operations will finish
+   * immediately, and the handlers for cancelled operations will be passed the
+   * asio::error::operation_aborted error.
+   */
+  native_handle_type release()
+  {
+    return this->get_service().release(this->get_implementation());
+  }
+
+  /// Cancel all asynchronous operations associated with the descriptor.
+  /**
+   * This function causes all outstanding asynchronous read or write operations
+   * to finish immediately, and the handlers for cancelled operations will be
+   * passed the asio::error::operation_aborted error.
+   *
+   * @throws asio::system_error Thrown on failure.
+   */
+  void cancel()
+  {
+    asio::error_code ec;
+    this->get_service().cancel(this->get_implementation(), ec);
+    asio::detail::throw_error(ec, "cancel");
+  }
+
+  /// Cancel all asynchronous operations associated with the descriptor.
+  /**
+   * This function causes all outstanding asynchronous read or write operations
+   * to finish immediately, and the handlers for cancelled operations will be
+   * passed the asio::error::operation_aborted error.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   */
+  ASIO_SYNC_OP_VOID cancel(asio::error_code& ec)
+  {
+    this->get_service().cancel(this->get_implementation(), ec);
+    ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Perform an IO control command on the descriptor.
+  /**
+   * This function is used to execute an IO control command on the descriptor.
+   *
+   * @param command The IO control command to be performed on the descriptor.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @sa IoControlCommand @n
+   * asio::posix::descriptor_base::bytes_readable @n
+   * asio::posix::descriptor_base::non_blocking_io
+   *
+   * @par Example
+   * Getting the number of bytes ready to read:
+   * @code
+   * asio::posix::stream_descriptor descriptor(io_context);
+   * ...
+   * asio::posix::stream_descriptor::bytes_readable command;
+   * descriptor.io_control(command);
+   * std::size_t bytes_readable = command.get();
+   * @endcode
+   */
+  template <typename IoControlCommand>
+  void io_control(IoControlCommand& command)
+  {
+    asio::error_code ec;
+    this->get_service().io_control(this->get_implementation(), command, ec);
+    asio::detail::throw_error(ec, "io_control");
+  }
+
+  /// Perform an IO control command on the descriptor.
+  /**
+   * This function is used to execute an IO control command on the descriptor.
+   *
+   * @param command The IO control command to be performed on the descriptor.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @sa IoControlCommand @n
+   * asio::posix::descriptor_base::bytes_readable @n
+   * asio::posix::descriptor_base::non_blocking_io
+   *
+   * @par Example
+   * Getting the number of bytes ready to read:
+   * @code
+   * asio::posix::stream_descriptor descriptor(io_context);
+   * ...
+   * asio::posix::stream_descriptor::bytes_readable command;
+   * asio::error_code ec;
+   * descriptor.io_control(command, ec);
+   * if (ec)
+   * {
+   *   // An error occurred.
+   * }
+   * std::size_t bytes_readable = command.get();
+   * @endcode
+   */
+  template <typename IoControlCommand>
+  ASIO_SYNC_OP_VOID io_control(IoControlCommand& command,
+      asio::error_code& ec)
+  {
+    this->get_service().io_control(this->get_implementation(), command, ec);
+    ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Gets the non-blocking mode of the descriptor.
+  /**
+   * @returns @c true if the descriptor's synchronous operations will fail with
+   * asio::error::would_block if they are unable to perform the requested
+   * operation immediately. If @c false, synchronous operations will block
+   * until complete.
+   *
+   * @note The non-blocking mode has no effect on the behaviour of asynchronous
+   * operations. Asynchronous operations will never fail with the error
+   * asio::error::would_block.
+   */
+  bool non_blocking() const
+  {
+    return this->get_service().non_blocking(this->get_implementation());
+  }
+
+  /// Sets the non-blocking mode of the descriptor.
+  /**
+   * @param mode If @c true, the descriptor's synchronous operations will fail
+   * with asio::error::would_block if they are unable to perform the
+   * requested operation immediately. If @c false, synchronous operations will
+   * block until complete.
+   *
+   * @throws asio::system_error Thrown on failure.
+   *
+   * @note The non-blocking mode has no effect on the behaviour of asynchronous
+   * operations. Asynchronous operations will never fail with the error
+   * asio::error::would_block.
+   */
+  void non_blocking(bool mode)
+  {
+    asio::error_code ec;
+    this->get_service().non_blocking(this->get_implementation(), mode, ec);
+    asio::detail::throw_error(ec, "non_blocking");
+  }
+
+  /// Sets the non-blocking mode of the descriptor.
+  /**
+   * @param mode If @c true, the descriptor's synchronous operations will fail
+   * with asio::error::would_block if they are unable to perform the
+   * requested operation immediately. If @c false, synchronous operations will
+   * block until complete.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @note The non-blocking mode has no effect on the behaviour of asynchronous
+   * operations. Asynchronous operations will never fail with the error
+   * asio::error::would_block.
+   */
+  ASIO_SYNC_OP_VOID non_blocking(
+      bool mode, asio::error_code& ec)
+  {
+    this->get_service().non_blocking(this->get_implementation(), mode, ec);
+    ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Gets the non-blocking mode of the native descriptor implementation.
+  /**
+   * This function is used to retrieve the non-blocking mode of the underlying
+   * native descriptor. This mode has no effect on the behaviour of the
+   * descriptor object's synchronous operations.
+   *
+   * @returns @c true if the underlying descriptor is in non-blocking mode and
+   * direct system calls may fail with asio::error::would_block (or the
+   * equivalent system error).
+   *
+   * @note The current non-blocking mode is cached by the descriptor object.
+   * Consequently, the return value may be incorrect if the non-blocking mode
+   * was set directly on the native descriptor.
+   */
+  bool native_non_blocking() const
+  {
+    return this->get_service().native_non_blocking(
+        this->get_implementation());
+  }
+
+  /// Sets the non-blocking mode of the native descriptor implementation.
+  /**
+   * This function is used to modify the non-blocking mode of the underlying
+   * native descriptor. It has no effect on the behaviour of the descriptor
+   * object's synchronous operations.
+   *
+   * @param mode If @c true, the underlying descriptor is put into non-blocking
+   * mode and direct system calls may fail with asio::error::would_block
+   * (or the equivalent system error).
+   *
+   * @throws asio::system_error Thrown on failure. If the @c mode is
+   * @c false, but the current value of @c non_blocking() is @c true, this
+   * function fails with asio::error::invalid_argument, as the
+   * combination does not make sense.
+   */
+  void native_non_blocking(bool mode)
+  {
+    asio::error_code ec;
+    this->get_service().native_non_blocking(
+        this->get_implementation(), mode, ec);
+    asio::detail::throw_error(ec, "native_non_blocking");
+  }
+
+  /// Sets the non-blocking mode of the native descriptor implementation.
+  /**
+   * This function is used to modify the non-blocking mode of the underlying
+   * native descriptor. It has no effect on the behaviour of the descriptor
+   * object's synchronous operations.
+   *
+   * @param mode If @c true, the underlying descriptor is put into non-blocking
+   * mode and direct system calls may fail with asio::error::would_block
+   * (or the equivalent system error).
+   *
+   * @param ec Set to indicate what error occurred, if any. If the @c mode is
+   * @c false, but the current value of @c non_blocking() is @c true, this
+   * function fails with asio::error::invalid_argument, as the
+   * combination does not make sense.
+   */
+  ASIO_SYNC_OP_VOID native_non_blocking(
+      bool mode, asio::error_code& ec)
+  {
+    this->get_service().native_non_blocking(
+        this->get_implementation(), mode, ec);
+    ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Wait for the descriptor to become ready to read, ready to write, or to
+  /// have pending error conditions.
+  /**
+   * This function is used to perform a blocking wait for a descriptor to enter
+   * a ready to read, write or error condition state.
+   *
+   * @param w Specifies the desired descriptor state.
+   *
+   * @par Example
+   * Waiting for a descriptor to become readable.
+   * @code
+   * asio::posix::stream_descriptor descriptor(io_context);
+   * ...
+   * descriptor.wait(asio::posix::stream_descriptor::wait_read);
+   * @endcode
+   */
+  void wait(wait_type w)
+  {
+    asio::error_code ec;
+    this->get_service().wait(this->get_implementation(), w, ec);
+    asio::detail::throw_error(ec, "wait");
+  }
+
+  /// Wait for the descriptor to become ready to read, ready to write, or to
+  /// have pending error conditions.
+  /**
+   * This function is used to perform a blocking wait for a descriptor to enter
+   * a ready to read, write or error condition state.
+   *
+   * @param w Specifies the desired descriptor state.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @par Example
+   * Waiting for a descriptor to become readable.
+   * @code
+   * asio::posix::stream_descriptor descriptor(io_context);
+   * ...
+   * asio::error_code ec;
+   * descriptor.wait(asio::posix::stream_descriptor::wait_read, ec);
+   * @endcode
+   */
+  ASIO_SYNC_OP_VOID wait(wait_type w, asio::error_code& ec)
+  {
+    this->get_service().wait(this->get_implementation(), w, ec);
+    ASIO_SYNC_OP_VOID_RETURN(ec);
+  }
+
+  /// Asynchronously wait for the descriptor to become ready to read, ready to
+  /// write, or to have pending error conditions.
+  /**
+   * This function is used to perform an asynchronous wait for a descriptor to
+   * enter a ready to read, write or error condition state.
+   *
+   * @param w Specifies the desired descriptor state.
+   *
+   * @param handler The handler to be called when the wait operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const asio::error_code& error // Result of operation
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * asio::io_context::post().
+   *
+   * @par Example
+   * @code
+   * void wait_handler(const asio::error_code& error)
+   * {
+   *   if (!error)
+   *   {
+   *     // Wait succeeded.
+   *   }
+   * }
+   *
+   * ...
+   *
+   * asio::posix::stream_descriptor descriptor(io_context);
+   * ...
+   * descriptor.async_wait(
+   *     asio::posix::stream_descriptor::wait_read,
+   *     wait_handler);
+   * @endcode
+   */
+  template <typename WaitHandler>
+  ASIO_INITFN_RESULT_TYPE(WaitHandler,
+      void (asio::error_code))
+  async_wait(wait_type w, ASIO_MOVE_ARG(WaitHandler) handler)
+  {
+    // If you get an error on the following line it means that your handler does
+    // not meet the documented type requirements for a WaitHandler.
+    ASIO_WAIT_HANDLER_CHECK(WaitHandler, handler) type_check;
+
+    async_completion<WaitHandler,
+      void (asio::error_code)> init(handler);
+
+    this->get_service().async_wait(
+        this->get_implementation(), w, init.completion_handler);
+
+    return init.result.get();
+  }
+
+protected:
+  /// Protected destructor to prevent deletion through this type.
+  /**
+   * This function destroys the descriptor, cancelling any outstanding
+   * asynchronous wait operations associated with the descriptor as if by
+   * calling @c cancel.
+   */
+  ~descriptor()
+  {
+  }
+};
+
+} // namespace posix
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#undef ASIO_SVC_T
+
+#endif // defined(ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#endif // !defined(ASIO_ENABLE_OLD_SERVICES)
+
+#endif // ASIO_POSIX_DESCRIPTOR_HPP