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include/asio/detail/win_iocp_socket_accept_op.hpp

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+//
+// detail/win_iocp_socket_accept_op.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2025 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_DETAIL_WIN_IOCP_SOCKET_ACCEPT_OP_HPP
+#define ASIO_DETAIL_WIN_IOCP_SOCKET_ACCEPT_OP_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_HAS_IOCP)
+
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_work.hpp"
+#include "asio/detail/memory.hpp"
+#include "asio/detail/operation.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/win_iocp_socket_service_base.hpp"
+#include "asio/error.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Socket, typename Protocol,
+    typename Handler, typename IoExecutor>
+class win_iocp_socket_accept_op : public operation
+{
+public:
+  ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_accept_op);
+
+  win_iocp_socket_accept_op(win_iocp_socket_service_base& socket_service,
+      socket_type socket, Socket& peer, const Protocol& protocol,
+      typename Protocol::endpoint* peer_endpoint,
+      bool enable_connection_aborted, Handler& handler, const IoExecutor& io_ex)
+    : operation(&win_iocp_socket_accept_op::do_complete),
+      socket_service_(socket_service),
+      socket_(socket),
+      peer_(peer),
+      protocol_(protocol),
+      peer_endpoint_(peer_endpoint),
+      enable_connection_aborted_(enable_connection_aborted),
+      proxy_op_(0),
+      cancel_requested_(0),
+      handler_(static_cast<Handler&&>(handler)),
+      work_(handler_, io_ex)
+  {
+  }
+
+  socket_holder& new_socket()
+  {
+    return new_socket_;
+  }
+
+  void* output_buffer()
+  {
+    return output_buffer_;
+  }
+
+  DWORD address_length()
+  {
+    return sizeof(sockaddr_storage_type) + 16;
+  }
+
+  void enable_cancellation(long* cancel_requested, operation* proxy_op)
+  {
+    cancel_requested_ = cancel_requested;
+    proxy_op_ = proxy_op;
+  }
+
+  static void do_complete(void* owner, operation* base,
+      const asio::error_code& result_ec,
+      std::size_t /*bytes_transferred*/)
+  {
+    asio::error_code ec(result_ec);
+
+    // Take ownership of the operation object.
+    ASIO_ASSUME(base != 0);
+    win_iocp_socket_accept_op* o(static_cast<win_iocp_socket_accept_op*>(base));
+    ptr p = { asio::detail::addressof(o->handler_), o, o };
+
+    if (owner)
+    {
+      typename Protocol::endpoint peer_endpoint;
+      std::size_t addr_len = peer_endpoint.capacity();
+      socket_ops::complete_iocp_accept(o->socket_,
+          o->output_buffer(), o->address_length(),
+          peer_endpoint.data(), &addr_len,
+          o->new_socket_.get(), ec);
+
+      // Restart the accept operation if we got the connection_aborted error
+      // and the enable_connection_aborted socket option is not set.
+      if (ec == asio::error::connection_aborted
+          && !o->enable_connection_aborted_)
+      {
+        o->reset();
+        if (o->proxy_op_)
+          o->proxy_op_->reset();
+        o->socket_service_.restart_accept_op(o->socket_,
+            o->new_socket_, o->protocol_.family(),
+            o->protocol_.type(), o->protocol_.protocol(),
+            o->output_buffer(), o->address_length(),
+            o->cancel_requested_, o->proxy_op_ ? o->proxy_op_ : o);
+        p.v = p.p = 0;
+        return;
+      }
+
+      // If the socket was successfully accepted, transfer ownership of the
+      // socket to the peer object.
+      if (!ec)
+      {
+        o->peer_.assign(o->protocol_,
+            typename Socket::native_handle_type(
+              o->new_socket_.get(), peer_endpoint), ec);
+        if (!ec)
+          o->new_socket_.release();
+      }
+
+      // Pass endpoint back to caller.
+      if (o->peer_endpoint_)
+        *o->peer_endpoint_ = peer_endpoint;
+    }
+
+    ASIO_HANDLER_COMPLETION((*o));
+
+    // Take ownership of the operation's outstanding work.
+    handler_work<Handler, IoExecutor> w(
+        static_cast<handler_work<Handler, IoExecutor>&&>(
+          o->work_));
+
+    ASIO_ERROR_LOCATION(ec);
+
+    // Make a copy of the handler so that the memory can be deallocated before
+    // the upcall is made. Even if we're not about to make an upcall, a
+    // sub-object of the handler may be the true owner of the memory associated
+    // with the handler. Consequently, a local copy of the handler is required
+    // to ensure that any owning sub-object remains valid until after we have
+    // deallocated the memory here.
+    detail::binder1<Handler, asio::error_code>
+      handler(o->handler_, ec);
+    p.h = asio::detail::addressof(handler.handler_);
+    p.reset();
+
+    // Make the upcall if required.
+    if (owner)
+    {
+      fenced_block b(fenced_block::half);
+      ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_));
+      w.complete(handler, handler.handler_);
+      ASIO_HANDLER_INVOCATION_END;
+    }
+  }
+
+private:
+  win_iocp_socket_service_base& socket_service_;
+  socket_type socket_;
+  socket_holder new_socket_;
+  Socket& peer_;
+  Protocol protocol_;
+  typename Protocol::endpoint* peer_endpoint_;
+  unsigned char output_buffer_[(sizeof(sockaddr_storage_type) + 16) * 2];
+  bool enable_connection_aborted_;
+  operation* proxy_op_;
+  long* cancel_requested_;
+  Handler handler_;
+  handler_work<Handler, IoExecutor> work_;
+};
+
+template <typename Protocol, typename PeerIoExecutor,
+    typename Handler, typename IoExecutor>
+class win_iocp_socket_move_accept_op : public operation
+{
+public:
+  ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_move_accept_op);
+
+  win_iocp_socket_move_accept_op(
+      win_iocp_socket_service_base& socket_service, socket_type socket,
+      const Protocol& protocol, const PeerIoExecutor& peer_io_ex,
+      typename Protocol::endpoint* peer_endpoint,
+      bool enable_connection_aborted, Handler& handler, const IoExecutor& io_ex)
+    : operation(&win_iocp_socket_move_accept_op::do_complete),
+      socket_service_(socket_service),
+      socket_(socket),
+      peer_(peer_io_ex),
+      protocol_(protocol),
+      peer_endpoint_(peer_endpoint),
+      enable_connection_aborted_(enable_connection_aborted),
+      cancel_requested_(0),
+      proxy_op_(0),
+      handler_(static_cast<Handler&&>(handler)),
+      work_(handler_, io_ex)
+  {
+  }
+
+  socket_holder& new_socket()
+  {
+    return new_socket_;
+  }
+
+  void* output_buffer()
+  {
+    return output_buffer_;
+  }
+
+  DWORD address_length()
+  {
+    return sizeof(sockaddr_storage_type) + 16;
+  }
+
+  void enable_cancellation(long* cancel_requested, operation* proxy_op)
+  {
+    cancel_requested_ = cancel_requested;
+    proxy_op_ = proxy_op;
+  }
+
+  static void do_complete(void* owner, operation* base,
+      const asio::error_code& result_ec,
+      std::size_t /*bytes_transferred*/)
+  {
+    asio::error_code ec(result_ec);
+
+    // Take ownership of the operation object.
+    ASIO_ASSUME(base != 0);
+    win_iocp_socket_move_accept_op* o(
+        static_cast<win_iocp_socket_move_accept_op*>(base));
+    ptr p = { asio::detail::addressof(o->handler_), o, o };
+
+    if (owner)
+    {
+      typename Protocol::endpoint peer_endpoint;
+      std::size_t addr_len = peer_endpoint.capacity();
+      socket_ops::complete_iocp_accept(o->socket_,
+          o->output_buffer(), o->address_length(),
+          peer_endpoint.data(), &addr_len,
+          o->new_socket_.get(), ec);
+
+      // Restart the accept operation if we got the connection_aborted error
+      // and the enable_connection_aborted socket option is not set.
+      if (ec == asio::error::connection_aborted
+          && !o->enable_connection_aborted_)
+      {
+        o->reset();
+        if (o->proxy_op_)
+          o->proxy_op_->reset();
+        o->socket_service_.restart_accept_op(o->socket_,
+            o->new_socket_, o->protocol_.family(),
+            o->protocol_.type(), o->protocol_.protocol(),
+            o->output_buffer(), o->address_length(),
+            o->cancel_requested_, o->proxy_op_ ? o->proxy_op_ : o);
+        p.v = p.p = 0;
+        return;
+      }
+
+      // If the socket was successfully accepted, transfer ownership of the
+      // socket to the peer object.
+      if (!ec)
+      {
+        o->peer_.assign(o->protocol_,
+            typename Protocol::socket::native_handle_type(
+              o->new_socket_.get(), peer_endpoint), ec);
+        if (!ec)
+          o->new_socket_.release();
+      }
+
+      // Pass endpoint back to caller.
+      if (o->peer_endpoint_)
+        *o->peer_endpoint_ = peer_endpoint;
+    }
+
+    ASIO_HANDLER_COMPLETION((*o));
+
+    // Take ownership of the operation's outstanding work.
+    handler_work<Handler, IoExecutor> w(
+        static_cast<handler_work<Handler, IoExecutor>&&>(
+          o->work_));
+
+    ASIO_ERROR_LOCATION(ec);
+
+    // Make a copy of the handler so that the memory can be deallocated before
+    // the upcall is made. Even if we're not about to make an upcall, a
+    // sub-object of the handler may be the true owner of the memory associated
+    // with the handler. Consequently, a local copy of the handler is required
+    // to ensure that any owning sub-object remains valid until after we have
+    // deallocated the memory here.
+    detail::move_binder2<Handler,
+      asio::error_code, peer_socket_type>
+        handler(0, static_cast<Handler&&>(o->handler_), ec,
+          static_cast<peer_socket_type&&>(o->peer_));
+    p.h = asio::detail::addressof(handler.handler_);
+    p.reset();
+
+    // Make the upcall if required.
+    if (owner)
+    {
+      fenced_block b(fenced_block::half);
+      ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, "..."));
+      w.complete(handler, handler.handler_);
+      ASIO_HANDLER_INVOCATION_END;
+    }
+  }
+
+private:
+  typedef typename Protocol::socket::template
+    rebind_executor<PeerIoExecutor>::other peer_socket_type;
+
+  win_iocp_socket_service_base& socket_service_;
+  socket_type socket_;
+  socket_holder new_socket_;
+  peer_socket_type peer_;
+  Protocol protocol_;
+  typename Protocol::endpoint* peer_endpoint_;
+  unsigned char output_buffer_[(sizeof(sockaddr_storage_type) + 16) * 2];
+  bool enable_connection_aborted_;
+  long* cancel_requested_;
+  operation* proxy_op_;
+  Handler handler_;
+  handler_work<Handler, IoExecutor> work_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(ASIO_HAS_IOCP)
+
+#endif // ASIO_DETAIL_WIN_IOCP_SOCKET_ACCEPT_OP_HPP