1//
2// detail/impl/reactive_serial_port_service.ipp
3// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4//
5// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
6// Copyright (c) 2008 Rep Invariant Systems, Inc. ([email protected])
7//
8// Distributed under the Boost Software License, Version 1.0. (See accompanying
9// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
10//
11
12#ifndef BOOST_ASIO_DETAIL_IMPL_REACTIVE_SERIAL_PORT_SERVICE_IPP
13#define BOOST_ASIO_DETAIL_IMPL_REACTIVE_SERIAL_PORT_SERVICE_IPP
14
15#if defined(_MSC_VER) && (_MSC_VER >= 1200)
16# pragma once
17#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
18
19#include <boost/asio/detail/config.hpp>
20
21#if defined(BOOST_ASIO_HAS_SERIAL_PORT)
22#if !defined(BOOST_ASIO_WINDOWS) && !defined(__CYGWIN__)
23
24#include <cstring>
25#include <boost/asio/detail/reactive_serial_port_service.hpp>
26
27#include <boost/asio/detail/push_options.hpp>
28
29namespace boost {
30namespace asio {
31namespace detail {
32
33reactive_serial_port_service::reactive_serial_port_service(
34    execution_context& context)
35  : execution_context_service_base<reactive_serial_port_service>(context),
36    descriptor_service_(context)
37{
38}
39
40void reactive_serial_port_service::shutdown()
41{
42  descriptor_service_.shutdown();
43}
44
45boost::system::error_code reactive_serial_port_service::open(
46    reactive_serial_port_service::implementation_type& impl,
47    const std::string& device, boost::system::error_code& ec)
48{
49  if (is_open(impl))
50  {
51    ec = boost::asio::error::already_open;
52    return ec;
53  }
54
55  descriptor_ops::state_type state = 0;
56  int fd = descriptor_ops::open(device.c_str(),
57      O_RDWR | O_NONBLOCK | O_NOCTTY, ec);
58  if (fd < 0)
59    return ec;
60
61  int s = descriptor_ops::fcntl(fd, F_GETFL, ec);
62  if (s >= 0)
63    s = descriptor_ops::fcntl(fd, F_SETFL, s | O_NONBLOCK, ec);
64  if (s < 0)
65  {
66    boost::system::error_code ignored_ec;
67    descriptor_ops::close(fd, state, ignored_ec);
68    return ec;
69  }
70
71  // Set up default serial port options.
72  termios ios;
73  s = ::tcgetattr(fd, &ios);
74  descriptor_ops::get_last_error(ec, s < 0);
75  if (s >= 0)
76  {
77#if defined(_BSD_SOURCE) || defined(_DEFAULT_SOURCE)
78    ::cfmakeraw(&ios);
79#else
80    ios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK
81        | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
82    ios.c_oflag &= ~OPOST;
83    ios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
84    ios.c_cflag &= ~(CSIZE | PARENB);
85    ios.c_cflag |= CS8;
86#endif
87    ios.c_iflag |= IGNPAR;
88    ios.c_cflag |= CREAD | CLOCAL;
89    s = ::tcsetattr(fd, TCSANOW, &ios);
90    descriptor_ops::get_last_error(ec, s < 0);
91  }
92  if (s < 0)
93  {
94    boost::system::error_code ignored_ec;
95    descriptor_ops::close(fd, state, ignored_ec);
96    return ec;
97  }
98
99  // We're done. Take ownership of the serial port descriptor.
100  if (descriptor_service_.assign(impl, fd, ec))
101  {
102    boost::system::error_code ignored_ec;
103    descriptor_ops::close(fd, state, ignored_ec);
104  }
105
106  return ec;
107}
108
109boost::system::error_code reactive_serial_port_service::do_set_option(
110    reactive_serial_port_service::implementation_type& impl,
111    reactive_serial_port_service::store_function_type store,
112    const void* option, boost::system::error_code& ec)
113{
114  termios ios;
115  int s = ::tcgetattr(descriptor_service_.native_handle(impl), &ios);
116  descriptor_ops::get_last_error(ec, s < 0);
117  if (s < 0)
118    return ec;
119
120  if (store(option, ios, ec))
121    return ec;
122
123  s = ::tcsetattr(descriptor_service_.native_handle(impl), TCSANOW, &ios);
124  descriptor_ops::get_last_error(ec, s < 0);
125  return ec;
126}
127
128boost::system::error_code reactive_serial_port_service::do_get_option(
129    const reactive_serial_port_service::implementation_type& impl,
130    reactive_serial_port_service::load_function_type load,
131    void* option, boost::system::error_code& ec) const
132{
133  termios ios;
134  int s = ::tcgetattr(descriptor_service_.native_handle(impl), &ios);
135  descriptor_ops::get_last_error(ec, s < 0);
136  if (s < 0)
137    return ec;
138
139  return load(option, ios, ec);
140}
141
142} // namespace detail
143} // namespace asio
144} // namespace boost
145
146#include <boost/asio/detail/pop_options.hpp>
147
148#endif // !defined(BOOST_ASIO_WINDOWS) && !defined(__CYGWIN__)
149#endif // defined(BOOST_ASIO_HAS_SERIAL_PORT)
150
151#endif // BOOST_ASIO_DETAIL_IMPL_REACTIVE_SERIAL_PORT_SERVICE_IPP
152