boost/asio/detail/impl/win_iocp_serial_port_service.ipp
// // detail/impl/win_iocp_serial_port_service.ipp // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2024 Christopher M. Kohlhoff (chris at kohlhoff dot com) // Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.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 BOOST_ASIO_DETAIL_IMPL_WIN_IOCP_SERIAL_PORT_SERVICE_IPP #define BOOST_ASIO_DETAIL_IMPL_WIN_IOCP_SERIAL_PORT_SERVICE_IPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include <boost/asio/detail/config.hpp> #if defined(BOOST_ASIO_HAS_IOCP) && defined(BOOST_ASIO_HAS_SERIAL_PORT) #include <cstring> #include <boost/asio/detail/win_iocp_serial_port_service.hpp> #include <boost/asio/detail/push_options.hpp> namespace boost { namespace asio { namespace detail { win_iocp_serial_port_service::win_iocp_serial_port_service( execution_context& context) : execution_context_service_base<win_iocp_serial_port_service>(context), handle_service_(context) { } void win_iocp_serial_port_service::shutdown() { } boost::system::error_code win_iocp_serial_port_service::open( win_iocp_serial_port_service::implementation_type& impl, const std::string& device, boost::system::error_code& ec) { if (is_open(impl)) { ec = boost::asio::error::already_open; BOOST_ASIO_ERROR_LOCATION(ec); return ec; } // For convenience, add a leading \\.\ sequence if not already present. std::string name = (device[0] == '\\') ? device : "\\\\.\\" + device; // Open a handle to the serial port. ::HANDLE handle = ::CreateFileA(name.c_str(), GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0); if (handle == INVALID_HANDLE_VALUE) { DWORD last_error = ::GetLastError(); ec = boost::system::error_code(last_error, boost::asio::error::get_system_category()); BOOST_ASIO_ERROR_LOCATION(ec); return ec; } // Determine the initial serial port parameters. using namespace std; // For memset. ::DCB dcb; memset(&dcb, 0, sizeof(DCB)); dcb.DCBlength = sizeof(DCB); if (!::GetCommState(handle, &dcb)) { DWORD last_error = ::GetLastError(); ::CloseHandle(handle); ec = boost::system::error_code(last_error, boost::asio::error::get_system_category()); BOOST_ASIO_ERROR_LOCATION(ec); return ec; } // Set some default serial port parameters. This implementation does not // support changing all of these, so they might as well be in a known state. dcb.fBinary = TRUE; // Win32 only supports binary mode. dcb.fNull = FALSE; // Do not ignore NULL characters. dcb.fAbortOnError = FALSE; // Ignore serial framing errors. dcb.BaudRate = CBR_9600; // 9600 baud by default dcb.ByteSize = 8; // 8 bit bytes dcb.fOutxCtsFlow = FALSE; // No flow control dcb.fOutxDsrFlow = FALSE; dcb.fDtrControl = DTR_CONTROL_DISABLE; dcb.fDsrSensitivity = FALSE; dcb.fOutX = FALSE; dcb.fInX = FALSE; dcb.fRtsControl = RTS_CONTROL_DISABLE; dcb.fParity = FALSE; // No parity dcb.Parity = NOPARITY; dcb.StopBits = ONESTOPBIT; // One stop bit if (!::SetCommState(handle, &dcb)) { DWORD last_error = ::GetLastError(); ::CloseHandle(handle); ec = boost::system::error_code(last_error, boost::asio::error::get_system_category()); BOOST_ASIO_ERROR_LOCATION(ec); return ec; } // Set up timeouts so that the serial port will behave similarly to a // network socket. Reads wait for at least one byte, then return with // whatever they have. Writes return once everything is out the door. ::COMMTIMEOUTS timeouts; timeouts.ReadIntervalTimeout = 1; timeouts.ReadTotalTimeoutMultiplier = 0; timeouts.ReadTotalTimeoutConstant = 0; timeouts.WriteTotalTimeoutMultiplier = 0; timeouts.WriteTotalTimeoutConstant = 0; if (!::SetCommTimeouts(handle, &timeouts)) { DWORD last_error = ::GetLastError(); ::CloseHandle(handle); ec = boost::system::error_code(last_error, boost::asio::error::get_system_category()); BOOST_ASIO_ERROR_LOCATION(ec); return ec; } // We're done. Take ownership of the serial port handle. if (handle_service_.assign(impl, handle, ec)) ::CloseHandle(handle); return ec; } boost::system::error_code win_iocp_serial_port_service::do_set_option( win_iocp_serial_port_service::implementation_type& impl, win_iocp_serial_port_service::store_function_type store, const void* option, boost::system::error_code& ec) { using namespace std; // For memcpy. ::DCB dcb; memset(&dcb, 0, sizeof(DCB)); dcb.DCBlength = sizeof(DCB); if (!::GetCommState(handle_service_.native_handle(impl), &dcb)) { DWORD last_error = ::GetLastError(); ec = boost::system::error_code(last_error, boost::asio::error::get_system_category()); BOOST_ASIO_ERROR_LOCATION(ec); return ec; } if (store(option, dcb, ec)) return ec; if (!::SetCommState(handle_service_.native_handle(impl), &dcb)) { DWORD last_error = ::GetLastError(); ec = boost::system::error_code(last_error, boost::asio::error::get_system_category()); BOOST_ASIO_ERROR_LOCATION(ec); return ec; } ec = boost::system::error_code(); return ec; } boost::system::error_code win_iocp_serial_port_service::do_get_option( const win_iocp_serial_port_service::implementation_type& impl, win_iocp_serial_port_service::load_function_type load, void* option, boost::system::error_code& ec) const { using namespace std; // For memset. ::DCB dcb; memset(&dcb, 0, sizeof(DCB)); dcb.DCBlength = sizeof(DCB); if (!::GetCommState(handle_service_.native_handle(impl), &dcb)) { DWORD last_error = ::GetLastError(); ec = boost::system::error_code(last_error, boost::asio::error::get_system_category()); BOOST_ASIO_ERROR_LOCATION(ec); return ec; } return load(option, dcb, ec); } } // namespace detail } // namespace asio } // namespace boost #include <boost/asio/detail/pop_options.hpp> #endif // defined(BOOST_ASIO_HAS_IOCP) && defined(BOOST_ASIO_HAS_SERIAL_PORT) #endif // BOOST_ASIO_DETAIL_IMPL_WIN_IOCP_SERIAL_PORT_SERVICE_IPP