socket_option.hpp 6.14 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
//
// socket_option.hpp
// ~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2010 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_SOCKET_OPTION_HPP
#define ASIO_DETAIL_SOCKET_OPTION_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include "asio/detail/push_options.hpp"

#include "asio/detail/push_options.hpp"
#include <cstddef>
#include <stdexcept>
#include <boost/config.hpp>
#include <boost/throw_exception.hpp>
#include "asio/detail/pop_options.hpp"

#include "asio/detail/socket_types.hpp"

namespace asio {
namespace detail {
namespace socket_option {

// Helper template for implementing boolean-based options.
template <int Level, int Name>
class boolean
{
public:
  // Default constructor.
  boolean()
    : value_(0)
  {
  }

  // Construct with a specific option value.
  explicit boolean(bool v)
    : value_(v ? 1 : 0)
  {
  }

  // Set the current value of the boolean.
  boolean& operator=(bool v)
  {
    value_ = v ? 1 : 0;
    return *this;
  }

  // Get the current value of the boolean.
  bool value() const
  {
    return !!value_;
  }

  // Convert to bool.
  operator bool() const
  {
    return !!value_;
  }

  // Test for false.
  bool operator!() const
  {
    return !value_;
  }

  // Get the level of the socket option.
  template <typename Protocol>
  int level(const Protocol&) const
  {
    return Level;
  }

  // Get the name of the socket option.
  template <typename Protocol>
  int name(const Protocol&) const
  {
    return Name;
  }

  // Get the address of the boolean data.
  template <typename Protocol>
  int* data(const Protocol&)
  {
    return &value_;
  }

  // Get the address of the boolean data.
  template <typename Protocol>
  const int* data(const Protocol&) const
  {
    return &value_;
  }

  // Get the size of the boolean data.
  template <typename Protocol>
  std::size_t size(const Protocol&) const
  {
    return sizeof(value_);
  }

  // Set the size of the boolean data.
  template <typename Protocol>
  void resize(const Protocol&, std::size_t s)
  {
    // On some platforms (e.g. Windows Vista), the getsockopt function will
    // return the size of a boolean socket option as one byte, even though a
    // four byte integer was passed in.
    switch (s)
    {
    case sizeof(char):
      value_ = *reinterpret_cast<char*>(&value_) ? 1 : 0;
      break;
    case sizeof(value_):
      break;
    default:
      {
        std::length_error ex("boolean socket option resize");
        boost::throw_exception(ex);
      }
    }
  }

private:
  int value_;
};

// Helper template for implementing integer options.
template <int Level, int Name>
class integer
{
public:
  // Default constructor.
  integer()
    : value_(0)
  {
  }

  // Construct with a specific option value.
  explicit integer(int v)
    : value_(v)
  {
  }

  // Set the value of the int option.
  integer& operator=(int v)
  {
    value_ = v;
    return *this;
  }

  // Get the current value of the int option.
  int value() const
  {
    return value_;
  }

  // Get the level of the socket option.
  template <typename Protocol>
  int level(const Protocol&) const
  {
    return Level;
  }

  // Get the name of the socket option.
  template <typename Protocol>
  int name(const Protocol&) const
  {
    return Name;
  }

  // Get the address of the int data.
  template <typename Protocol>
  int* data(const Protocol&)
  {
    return &value_;
  }

  // Get the address of the int data.
  template <typename Protocol>
  const int* data(const Protocol&) const
  {
    return &value_;
  }

  // Get the size of the int data.
  template <typename Protocol>
  std::size_t size(const Protocol&) const
  {
    return sizeof(value_);
  }

  // Set the size of the int data.
  template <typename Protocol>
  void resize(const Protocol&, std::size_t s)
  {
    if (s != sizeof(value_))
    {
      std::length_error ex("integer socket option resize");
      boost::throw_exception(ex);
    }
  }

private:
  int value_;
};

// Helper template for implementing linger options.
template <int Level, int Name>
class linger
{
public:
  // Default constructor.
  linger()
  {
    value_.l_onoff = 0;
    value_.l_linger = 0;
  }

  // Construct with specific option values.
  linger(bool e, int t)
  {
    enabled(e);
    timeout BOOST_PREVENT_MACRO_SUBSTITUTION(t);
  }

  // Set the value for whether linger is enabled.
  void enabled(bool value)
  {
    value_.l_onoff = value ? 1 : 0;
  }

  // Get the value for whether linger is enabled.
  bool enabled() const
  {
    return value_.l_onoff != 0;
  }

  // Set the value for the linger timeout.
  void timeout BOOST_PREVENT_MACRO_SUBSTITUTION(int value)
  {
#if defined(WIN32)
    value_.l_linger = static_cast<u_short>(value);
#else
    value_.l_linger = value;
#endif
  }

  // Get the value for the linger timeout.
  int timeout BOOST_PREVENT_MACRO_SUBSTITUTION() const
  {
    return static_cast<int>(value_.l_linger);
  }

  // Get the level of the socket option.
  template <typename Protocol>
  int level(const Protocol&) const
  {
    return Level;
  }

  // Get the name of the socket option.
  template <typename Protocol>
  int name(const Protocol&) const
  {
    return Name;
  }

  // Get the address of the linger data.
  template <typename Protocol>
  ::linger* data(const Protocol&)
  {
    return &value_;
  }

  // Get the address of the linger data.
  template <typename Protocol>
  const ::linger* data(const Protocol&) const
  {
    return &value_;
  }

  // Get the size of the linger data.
  template <typename Protocol>
  std::size_t size(const Protocol&) const
  {
    return sizeof(value_);
  }

  // Set the size of the int data.
  template <typename Protocol>
  void resize(const Protocol&, std::size_t s)
  {
    if (s != sizeof(value_))
    {
      std::length_error ex("linger socket option resize");
      boost::throw_exception(ex);
    }
  }

private:
  ::linger value_;
};

} // namespace socket_option
} // namespace detail
} // namespace asio

#include "asio/detail/pop_options.hpp"

#endif // ASIO_DETAIL_SOCKET_OPTION_HPP