108 lines
2.9 KiB
C++
108 lines
2.9 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Copyright (c) Lewis Baker
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// Licenced under MIT license. See LICENSE.txt for details.
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///////////////////////////////////////////////////////////////////////////////
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#include <cppcoro/net/socket_disconnect_operation.hpp>
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#include <cppcoro/net/socket.hpp>
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#include "socket_helpers.hpp"
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#include <system_error>
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#if CPPCORO_OS_WINNT
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# include <WinSock2.h>
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# include <WS2tcpip.h>
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# include <MSWSock.h>
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# include <Windows.h>
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bool cppcoro::net::socket_disconnect_operation_impl::try_start(
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cppcoro::detail::win32_overlapped_operation_base& operation) noexcept
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{
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// Lookup the address of the DisconnectEx function pointer for this socket.
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LPFN_DISCONNECTEX disconnectExPtr;
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{
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GUID disconnectExGuid = WSAID_DISCONNECTEX;
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DWORD byteCount = 0;
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const int result = ::WSAIoctl(
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m_socket.native_handle(),
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SIO_GET_EXTENSION_FUNCTION_POINTER,
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static_cast<void*>(&disconnectExGuid),
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sizeof(disconnectExGuid),
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static_cast<void*>(&disconnectExPtr),
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sizeof(disconnectExPtr),
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&byteCount,
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nullptr,
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nullptr);
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if (result == SOCKET_ERROR)
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{
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operation.m_errorCode = static_cast<DWORD>(::WSAGetLastError());
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return false;
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}
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}
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// Need to read this flag before starting the operation, otherwise
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// it may be possible that the operation will complete immediately
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// on another thread and then destroy the socket before we get a
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// chance to read it.
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const bool skipCompletionOnSuccess = m_socket.skip_completion_on_success();
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// Need to add TF_REUSE_SOCKET to these flags if we want to allow reusing
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// a socket for subsequent connections once the disconnect operation
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// completes.
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const DWORD flags = 0;
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const BOOL ok = disconnectExPtr(
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m_socket.native_handle(),
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operation.get_overlapped(),
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flags,
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0);
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if (!ok)
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{
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const int errorCode = ::WSAGetLastError();
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if (errorCode != ERROR_IO_PENDING)
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{
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// Failed synchronously.
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operation.m_errorCode = static_cast<DWORD>(errorCode);
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return false;
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}
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}
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else if (skipCompletionOnSuccess)
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{
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// Successfully completed synchronously and no completion event
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// will be posted to an I/O thread so we can return without suspending.
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operation.m_errorCode = ERROR_SUCCESS;
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return false;
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}
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return true;
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}
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void cppcoro::net::socket_disconnect_operation_impl::cancel(
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cppcoro::detail::win32_overlapped_operation_base& operation) noexcept
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{
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(void)::CancelIoEx(
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reinterpret_cast<HANDLE>(m_socket.native_handle()),
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operation.get_overlapped());
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}
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void cppcoro::net::socket_disconnect_operation_impl::get_result(
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cppcoro::detail::win32_overlapped_operation_base& operation)
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{
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if (operation.m_errorCode != ERROR_SUCCESS)
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{
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if (operation.m_errorCode == ERROR_OPERATION_ABORTED)
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{
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throw operation_cancelled{};
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}
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throw std::system_error{
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static_cast<int>(operation.m_errorCode),
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std::system_category(),
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"Disconnect operation failed: DisconnectEx"
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};
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}
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}
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#endif
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