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//
// detail/impl/win_iocp_serial_port_service.ipp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2017 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(
boost::asio::io_service& io_service)
: handle_service_(io_service)
{
}
void win_iocp_serial_port_service::shutdown_service()
{
}
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;
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());
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());
return ec;
}
// Set some default serial port parameters. This implementation does not
// support changing these, so they might as well be in a known state.
dcb.fBinary = TRUE; // Win32 only supports binary mode.
dcb.fDsrSensitivity = FALSE;
dcb.fNull = FALSE; // Do not ignore NULL characters.
dcb.fAbortOnError = FALSE; // Ignore serial framing errors.
if (!::SetCommState(handle, &dcb))
{
DWORD last_error = ::GetLastError();
::CloseHandle(handle);
ec = boost::system::error_code(last_error,
boost::asio::error::get_system_category());
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());
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());
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());
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());
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
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