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  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="boost_asio.overview.networking.bsd_sockets"></a><a class="link" href="bsd_sockets.html" title="The BSD Socket API and Boost.Asio">The BSD
  28         Socket API and Boost.Asio</a>
  29 </h4></div></div></div>
  30 <p>
  31           The Boost.Asio library includes a low-level socket interface based on the
  32           BSD socket API, which is widely implemented and supported by extensive
  33           literature. It is also used as the basis for networking APIs in other languages,
  34           like Java. This low-level interface is designed to support the development
  35           of efficient and scalable applications. For example, it permits programmers
  36           to exert finer control over the number of system calls, avoid redundant
  37           data copying, minimise the use of resources like threads, and so on.
  38         </p>
  39 <p>
  40           Unsafe and error prone aspects of the BSD socket API are not included.
  41           For example, the use of <code class="computeroutput">int</code> to represent all sockets lacks
  42           type safety. The socket representation in Boost.Asio uses a distinct type
  43           for each protocol, e.g. for TCP one would use <code class="computeroutput">ip::tcp::socket</code>,
  44           and for UDP one uses <code class="computeroutput">ip::udp::socket</code>.
  45         </p>
  46 <p>
  47           The following table shows the mapping between the BSD socket API and Boost.Asio:
  48         </p>
  49 <div class="informaltable"><table class="table">
  50 <colgroup>
  51 <col>
  52 <col>
  53 </colgroup>
  54 <thead><tr>
  55 <th>
  56                   <p>
  57                     BSD Socket API Elements
  58                   </p>
  59                 </th>
  60 <th>
  61                   <p>
  62                     Equivalents in Boost.Asio
  63                   </p>
  64                 </th>
  65 </tr></thead>
  66 <tbody>
  67 <tr>
  68 <td>
  69                   <p>
  70                     socket descriptor - <code class="computeroutput">int</code> (POSIX) or <code class="computeroutput">SOCKET</code>
  71                     (Windows)
  72                   </p>
  73                 </td>
  74 <td>
  75                   <p>
  76                     For TCP: <a class="link" href="../../reference/ip__tcp/socket.html" title="ip::tcp::socket">ip::tcp::socket</a>,
  77                     <a class="link" href="../../reference/ip__tcp/acceptor.html" title="ip::tcp::acceptor">ip::tcp::acceptor</a>
  78                   </p>
  79                   <p>
  80                     For UDP: <a class="link" href="../../reference/ip__udp/socket.html" title="ip::udp::socket">ip::udp::socket</a>
  81                   </p>
  82                   <p>
  83                     <a class="link" href="../../reference/basic_socket.html" title="basic_socket">basic_socket</a>,
  84                     <a class="link" href="../../reference/basic_stream_socket.html" title="basic_stream_socket">basic_stream_socket</a>,
  85                     <a class="link" href="../../reference/basic_datagram_socket.html" title="basic_datagram_socket">basic_datagram_socket</a>,
  86                     <a class="link" href="../../reference/basic_raw_socket.html" title="basic_raw_socket">basic_raw_socket</a>
  87                   </p>
  88                 </td>
  89 </tr>
  90 <tr>
  91 <td>
  92                   <p>
  93                     <code class="computeroutput">in_addr</code>, <code class="computeroutput">in6_addr</code>
  94                   </p>
  95                 </td>
  96 <td>
  97                   <p>
  98                     <a class="link" href="../../reference/ip__address.html" title="ip::address">ip::address</a>,
  99                     <a class="link" href="../../reference/ip__address.html" title="ip::address">ip::address_v4</a>,
 100                     <a class="link" href="../../reference/ip__address.html" title="ip::address">ip::address_v6</a>
 101                   </p>
 102                 </td>
 103 </tr>
 104 <tr>
 105 <td>
 106                   <p>
 107                     <code class="computeroutput">sockaddr_in</code>, <code class="computeroutput">sockaddr_in6</code>
 108                   </p>
 109                 </td>
 110 <td>
 111                   <p>
 112                     For TCP: <a class="link" href="../../reference/ip__tcp/endpoint.html" title="ip::tcp::endpoint">ip::tcp::endpoint</a>
 113                   </p>
 114                   <p>
 115                     For UDP: <a class="link" href="../../reference/ip__udp/endpoint.html" title="ip::udp::endpoint">ip::udp::endpoint</a>
 116                   </p>
 117                   <p>
 118                     <a class="link" href="../../reference/ip__basic_endpoint.html" title="ip::basic_endpoint">ip::basic_endpoint</a>
 119                   </p>
 120                 </td>
 121 </tr>
 122 <tr>
 123 <td>
 124                   <p>
 125                     <code class="computeroutput">accept()</code>
 126                   </p>
 127                 </td>
 128 <td>
 129                   <p>
 130                     For TCP: <a class="link" href="../../reference/basic_socket_acceptor/accept.html" title="basic_socket_acceptor::accept">ip::tcp::acceptor::accept()</a>
 131                   </p>
 132                   <p>
 133                     <a class="link" href="../../reference/basic_socket_acceptor/accept.html" title="basic_socket_acceptor::accept">basic_socket_acceptor::accept()</a>
 134                   </p>
 135                 </td>
 136 </tr>
 137 <tr>
 138 <td>
 139                   <p>
 140                     <code class="computeroutput">bind()</code>
 141                   </p>
 142                 </td>
 143 <td>
 144                   <p>
 145                     For TCP: <a class="link" href="../../reference/basic_socket/bind.html" title="basic_socket::bind">ip::tcp::acceptor::bind()</a>,
 146                     <a class="link" href="../../reference/basic_socket/bind.html" title="basic_socket::bind">ip::tcp::socket::bind()</a>
 147                   </p>
 148                   <p>
 149                     For UDP: <a class="link" href="../../reference/basic_socket/bind.html" title="basic_socket::bind">ip::udp::socket::bind()</a>
 150                   </p>
 151                   <p>
 152                     <a class="link" href="../../reference/basic_socket/bind.html" title="basic_socket::bind">basic_socket::bind()</a>
 153                   </p>
 154                 </td>
 155 </tr>
 156 <tr>
 157 <td>
 158                   <p>
 159                     <code class="computeroutput">close()</code>
 160                   </p>
 161                 </td>
 162 <td>
 163                   <p>
 164                     For TCP: <a class="link" href="../../reference/basic_socket/close.html" title="basic_socket::close">ip::tcp::acceptor::close()</a>,
 165                     <a class="link" href="../../reference/basic_socket/close.html" title="basic_socket::close">ip::tcp::socket::close()</a>
 166                   </p>
 167                   <p>
 168                     For UDP: <a class="link" href="../../reference/basic_socket/close.html" title="basic_socket::close">ip::udp::socket::close()</a>
 169                   </p>
 170                   <p>
 171                     <a class="link" href="../../reference/basic_socket/close.html" title="basic_socket::close">basic_socket::close()</a>
 172                   </p>
 173                 </td>
 174 </tr>
 175 <tr>
 176 <td>
 177                   <p>
 178                     <code class="computeroutput">connect()</code>
 179                   </p>
 180                 </td>
 181 <td>
 182                   <p>
 183                     For TCP: <a class="link" href="../../reference/basic_socket/connect.html" title="basic_socket::connect">ip::tcp::socket::connect()</a>
 184                   </p>
 185                   <p>
 186                     For UDP: <a class="link" href="../../reference/basic_socket/connect.html" title="basic_socket::connect">ip::udp::socket::connect()</a>
 187                   </p>
 188                   <p>
 189                     <a class="link" href="../../reference/basic_socket/connect.html" title="basic_socket::connect">basic_socket::connect()</a>
 190                   </p>
 191                 </td>
 192 </tr>
 193 <tr>
 194 <td>
 195                   <p>
 196                     <code class="computeroutput">getaddrinfo()</code>, <code class="computeroutput">gethostbyaddr()</code>, <code class="computeroutput">gethostbyname()</code>,
 197                     <code class="computeroutput">getnameinfo()</code>, <code class="computeroutput">getservbyname()</code>, <code class="computeroutput">getservbyport()</code>
 198                   </p>
 199                 </td>
 200 <td>
 201                   <p>
 202                     For TCP: <a class="link" href="../../reference/ip__basic_resolver/resolve.html" title="ip::basic_resolver::resolve">ip::tcp::resolver::resolve()</a>,
 203                     <a class="link" href="../../reference/ip__basic_resolver/async_resolve.html" title="ip::basic_resolver::async_resolve">ip::tcp::resolver::async_resolve()</a>
 204                   </p>
 205                   <p>
 206                     For UDP: <a class="link" href="../../reference/ip__basic_resolver/resolve.html" title="ip::basic_resolver::resolve">ip::udp::resolver::resolve()</a>,
 207                     <a class="link" href="../../reference/ip__basic_resolver/async_resolve.html" title="ip::basic_resolver::async_resolve">ip::udp::resolver::async_resolve()</a>
 208                   </p>
 209                   <p>
 210                     <a class="link" href="../../reference/ip__basic_resolver/resolve.html" title="ip::basic_resolver::resolve">ip::basic_resolver::resolve()</a>,
 211                     <a class="link" href="../../reference/ip__basic_resolver/async_resolve.html" title="ip::basic_resolver::async_resolve">ip::basic_resolver::async_resolve()</a>
 212                   </p>
 213                 </td>
 214 </tr>
 215 <tr>
 216 <td>
 217                   <p>
 218                     <code class="computeroutput">gethostname()</code>
 219                   </p>
 220                 </td>
 221 <td>
 222                   <p>
 223                     <a class="link" href="../../reference/ip__host_name.html" title="ip::host_name">ip::host_name()</a>
 224                   </p>
 225                 </td>
 226 </tr>
 227 <tr>
 228 <td>
 229                   <p>
 230                     <code class="computeroutput">getpeername()</code>
 231                   </p>
 232                 </td>
 233 <td>
 234                   <p>
 235                     For TCP: <a class="link" href="../../reference/basic_socket/remote_endpoint.html" title="basic_socket::remote_endpoint">ip::tcp::socket::remote_endpoint()</a>
 236                   </p>
 237                   <p>
 238                     For UDP: <a class="link" href="../../reference/basic_socket/remote_endpoint.html" title="basic_socket::remote_endpoint">ip::udp::socket::remote_endpoint()</a>
 239                   </p>
 240                   <p>
 241                     <a class="link" href="../../reference/basic_socket/remote_endpoint.html" title="basic_socket::remote_endpoint">basic_socket::remote_endpoint()</a>
 242                   </p>
 243                 </td>
 244 </tr>
 245 <tr>
 246 <td>
 247                   <p>
 248                     <code class="computeroutput">getsockname()</code>
 249                   </p>
 250                 </td>
 251 <td>
 252                   <p>
 253                     For TCP: <a class="link" href="../../reference/basic_socket/local_endpoint.html" title="basic_socket::local_endpoint">ip::tcp::acceptor::local_endpoint()</a>,
 254                     <a class="link" href="../../reference/basic_socket/local_endpoint.html" title="basic_socket::local_endpoint">ip::tcp::socket::local_endpoint()</a>
 255                   </p>
 256                   <p>
 257                     For UDP: <a class="link" href="../../reference/basic_socket/local_endpoint.html" title="basic_socket::local_endpoint">ip::udp::socket::local_endpoint()</a>
 258                   </p>
 259                   <p>
 260                     <a class="link" href="../../reference/basic_socket/local_endpoint.html" title="basic_socket::local_endpoint">basic_socket::local_endpoint()</a>
 261                   </p>
 262                 </td>
 263 </tr>
 264 <tr>
 265 <td>
 266                   <p>
 267                     <code class="computeroutput">getsockopt()</code>
 268                   </p>
 269                 </td>
 270 <td>
 271                   <p>
 272                     For TCP: <a class="link" href="../../reference/basic_socket/get_option.html" title="basic_socket::get_option">ip::tcp::acceptor::get_option()</a>,
 273                     <a class="link" href="../../reference/basic_socket/get_option.html" title="basic_socket::get_option">ip::tcp::socket::get_option()</a>
 274                   </p>
 275                   <p>
 276                     For UDP: <a class="link" href="../../reference/basic_socket/get_option.html" title="basic_socket::get_option">ip::udp::socket::get_option()</a>
 277                   </p>
 278                   <p>
 279                     <a class="link" href="../../reference/basic_socket/get_option.html" title="basic_socket::get_option">basic_socket::get_option()</a>
 280                   </p>
 281                 </td>
 282 </tr>
 283 <tr>
 284 <td>
 285                   <p>
 286                     <code class="computeroutput">inet_addr()</code>, <code class="computeroutput">inet_aton()</code>, <code class="computeroutput">inet_pton()</code>
 287                   </p>
 288                 </td>
 289 <td>
 290                   <p>
 291                     <a class="link" href="../../reference/ip__address/from_string.html" title="ip::address::from_string">ip::address::from_string()</a>,
 292                     <a class="link" href="../../reference/ip__address/from_string.html" title="ip::address::from_string">ip::address_v4::from_string()</a>,
 293                     <a class="link" href="../../reference/ip__address/from_string.html" title="ip::address::from_string">ip_address_v6::from_string()</a>
 294                   </p>
 295                 </td>
 296 </tr>
 297 <tr>
 298 <td>
 299                   <p>
 300                     <code class="computeroutput">inet_ntoa()</code>, <code class="computeroutput">inet_ntop()</code>
 301                   </p>
 302                 </td>
 303 <td>
 304                   <p>
 305                     <a class="link" href="../../reference/ip__address/to_string.html" title="ip::address::to_string">ip::address::to_string()</a>,
 306                     <a class="link" href="../../reference/ip__address/to_string.html" title="ip::address::to_string">ip::address_v4::to_string()</a>,
 307                     <a class="link" href="../../reference/ip__address/to_string.html" title="ip::address::to_string">ip_address_v6::to_string()</a>
 308                   </p>
 309                 </td>
 310 </tr>
 311 <tr>
 312 <td>
 313                   <p>
 314                     <code class="computeroutput">ioctl()</code>
 315                   </p>
 316                 </td>
 317 <td>
 318                   <p>
 319                     For TCP: <a class="link" href="../../reference/basic_socket/io_control.html" title="basic_socket::io_control">ip::tcp::socket::io_control()</a>
 320                   </p>
 321                   <p>
 322                     For UDP: <a class="link" href="../../reference/basic_socket/io_control.html" title="basic_socket::io_control">ip::udp::socket::io_control()</a>
 323                   </p>
 324                   <p>
 325                     <a class="link" href="../../reference/basic_socket/io_control.html" title="basic_socket::io_control">basic_socket::io_control()</a>
 326                   </p>
 327                 </td>
 328 </tr>
 329 <tr>
 330 <td>
 331                   <p>
 332                     <code class="computeroutput">listen()</code>
 333                   </p>
 334                 </td>
 335 <td>
 336                   <p>
 337                     For TCP: <a class="link" href="../../reference/basic_socket_acceptor/listen.html" title="basic_socket_acceptor::listen">ip::tcp::acceptor::listen()</a>
 338                   </p>
 339                   <p>
 340                     <a class="link" href="../../reference/basic_socket_acceptor/listen.html" title="basic_socket_acceptor::listen">basic_socket_acceptor::listen()</a>
 341                   </p>
 342                 </td>
 343 </tr>
 344 <tr>
 345 <td>
 346                   <p>
 347                     <code class="computeroutput">poll()</code>, <code class="computeroutput">select()</code>, <code class="computeroutput">pselect()</code>
 348                   </p>
 349                 </td>
 350 <td>
 351                   <p>
 352                     <a class="link" href="../../reference/io_context/run.html" title="io_context::run">io_context::run()</a>,
 353                     <a class="link" href="../../reference/io_context/run_one.html" title="io_context::run_one">io_context::run_one()</a>,
 354                     <a class="link" href="../../reference/io_context/poll.html" title="io_context::poll">io_context::poll()</a>,
 355                     <a class="link" href="../../reference/io_context/poll_one.html" title="io_context::poll_one">io_context::poll_one()</a>
 356                   </p>
 357                   <p>
 358                     Note: in conjunction with asynchronous operations.
 359                   </p>
 360                 </td>
 361 </tr>
 362 <tr>
 363 <td>
 364                   <p>
 365                     <code class="computeroutput">readv()</code>, <code class="computeroutput">recv()</code>, <code class="computeroutput">read()</code>
 366                   </p>
 367                 </td>
 368 <td>
 369                   <p>
 370                     For TCP: <a class="link" href="../../reference/basic_stream_socket/read_some.html" title="basic_stream_socket::read_some">ip::tcp::socket::read_some()</a>,
 371                     <a class="link" href="../../reference/basic_stream_socket/async_read_some.html" title="basic_stream_socket::async_read_some">ip::tcp::socket::async_read_some()</a>,
 372                     <a class="link" href="../../reference/basic_stream_socket/receive.html" title="basic_stream_socket::receive">ip::tcp::socket::receive()</a>,
 373                     <a class="link" href="../../reference/basic_stream_socket/async_receive.html" title="basic_stream_socket::async_receive">ip::tcp::socket::async_receive()</a>
 374                   </p>
 375                   <p>
 376                     For UDP: <a class="link" href="../../reference/basic_datagram_socket/receive.html" title="basic_datagram_socket::receive">ip::udp::socket::receive()</a>,
 377                     <a class="link" href="../../reference/basic_datagram_socket/async_receive.html" title="basic_datagram_socket::async_receive">ip::udp::socket::async_receive()</a>
 378                   </p>
 379                   <p>
 380                     <a class="link" href="../../reference/basic_stream_socket/read_some.html" title="basic_stream_socket::read_some">basic_stream_socket::read_some()</a>,
 381                     <a class="link" href="../../reference/basic_stream_socket/async_read_some.html" title="basic_stream_socket::async_read_some">basic_stream_socket::async_read_some()</a>,
 382                     <a class="link" href="../../reference/basic_stream_socket/receive.html" title="basic_stream_socket::receive">basic_stream_socket::receive()</a>,
 383                     <a class="link" href="../../reference/basic_stream_socket/async_receive.html" title="basic_stream_socket::async_receive">basic_stream_socket::async_receive()</a>,
 384                     <a class="link" href="../../reference/basic_datagram_socket/receive.html" title="basic_datagram_socket::receive">basic_datagram_socket::receive()</a>,
 385                     <a class="link" href="../../reference/basic_datagram_socket/async_receive.html" title="basic_datagram_socket::async_receive">basic_datagram_socket::async_receive()</a>
 386                   </p>
 387                 </td>
 388 </tr>
 389 <tr>
 390 <td>
 391                   <p>
 392                     <code class="computeroutput">recvfrom()</code>
 393                   </p>
 394                 </td>
 395 <td>
 396                   <p>
 397                     For UDP: <a class="link" href="../../reference/basic_datagram_socket/receive_from.html" title="basic_datagram_socket::receive_from">ip::udp::socket::receive_from()</a>,
 398                     <a class="link" href="../../reference/basic_datagram_socket/async_receive_from.html" title="basic_datagram_socket::async_receive_from">ip::udp::socket::async_receive_from()</a>
 399                   </p>
 400                   <p>
 401                     <a class="link" href="../../reference/basic_datagram_socket/receive_from.html" title="basic_datagram_socket::receive_from">basic_datagram_socket::receive_from()</a>,
 402                     <a class="link" href="../../reference/basic_datagram_socket/async_receive_from.html" title="basic_datagram_socket::async_receive_from">basic_datagram_socket::async_receive_from()</a>
 403                   </p>
 404                 </td>
 405 </tr>
 406 <tr>
 407 <td>
 408                   <p>
 409                     <code class="computeroutput">send()</code>, <code class="computeroutput">write()</code>, <code class="computeroutput">writev()</code>
 410                   </p>
 411                 </td>
 412 <td>
 413                   <p>
 414                     For TCP: <a class="link" href="../../reference/basic_stream_socket/write_some.html" title="basic_stream_socket::write_some">ip::tcp::socket::write_some()</a>,
 415                     <a class="link" href="../../reference/basic_stream_socket/async_write_some.html" title="basic_stream_socket::async_write_some">ip::tcp::socket::async_write_some()</a>,
 416                     <a class="link" href="../../reference/basic_stream_socket/send.html" title="basic_stream_socket::send">ip::tcp::socket::send()</a>,
 417                     <a class="link" href="../../reference/basic_stream_socket/async_send.html" title="basic_stream_socket::async_send">ip::tcp::socket::async_send()</a>
 418                   </p>
 419                   <p>
 420                     For UDP: <a class="link" href="../../reference/basic_datagram_socket/send.html" title="basic_datagram_socket::send">ip::udp::socket::send()</a>,
 421                     <a class="link" href="../../reference/basic_datagram_socket/async_send.html" title="basic_datagram_socket::async_send">ip::udp::socket::async_send()</a>
 422                   </p>
 423                   <p>
 424                     <a class="link" href="../../reference/basic_stream_socket/write_some.html" title="basic_stream_socket::write_some">basic_stream_socket::write_some()</a>,
 425                     <a class="link" href="../../reference/basic_stream_socket/async_write_some.html" title="basic_stream_socket::async_write_some">basic_stream_socket::async_write_some()</a>,
 426                     <a class="link" href="../../reference/basic_stream_socket/send.html" title="basic_stream_socket::send">basic_stream_socket::send()</a>,
 427                     <a class="link" href="../../reference/basic_stream_socket/async_send.html" title="basic_stream_socket::async_send">basic_stream_socket::async_send()</a>,
 428                     <a class="link" href="../../reference/basic_datagram_socket/send.html" title="basic_datagram_socket::send">basic_datagram_socket::send()</a>,
 429                     <a class="link" href="../../reference/basic_datagram_socket/async_send.html" title="basic_datagram_socket::async_send">basic_datagram_socket::async_send()</a>
 430                   </p>
 431                 </td>
 432 </tr>
 433 <tr>
 434 <td>
 435                   <p>
 436                     <code class="computeroutput">sendto()</code>
 437                   </p>
 438                 </td>
 439 <td>
 440                   <p>
 441                     For UDP: <a class="link" href="../../reference/basic_datagram_socket/send_to.html" title="basic_datagram_socket::send_to">ip::udp::socket::send_to()</a>,
 442                     <a class="link" href="../../reference/basic_datagram_socket/async_send_to.html" title="basic_datagram_socket::async_send_to">ip::udp::socket::async_send_to()</a>
 443                   </p>
 444                   <p>
 445                     <a class="link" href="../../reference/basic_datagram_socket/send_to.html" title="basic_datagram_socket::send_to">basic_datagram_socket::send_to()</a>,
 446                     <a class="link" href="../../reference/basic_datagram_socket/async_send_to.html" title="basic_datagram_socket::async_send_to">basic_datagram_socket::async_send_to()</a>
 447                   </p>
 448                 </td>
 449 </tr>
 450 <tr>
 451 <td>
 452                   <p>
 453                     <code class="computeroutput">setsockopt()</code>
 454                   </p>
 455                 </td>
 456 <td>
 457                   <p>
 458                     For TCP: <a class="link" href="../../reference/basic_socket/set_option.html" title="basic_socket::set_option">ip::tcp::acceptor::set_option()</a>,
 459                     <a class="link" href="../../reference/basic_socket/set_option.html" title="basic_socket::set_option">ip::tcp::socket::set_option()</a>
 460                   </p>
 461                   <p>
 462                     For UDP: <a class="link" href="../../reference/basic_socket/set_option.html" title="basic_socket::set_option">ip::udp::socket::set_option()</a>
 463                   </p>
 464                   <p>
 465                     <a class="link" href="../../reference/basic_socket/set_option.html" title="basic_socket::set_option">basic_socket::set_option()</a>
 466                   </p>
 467                 </td>
 468 </tr>
 469 <tr>
 470 <td>
 471                   <p>
 472                     <code class="computeroutput">shutdown()</code>
 473                   </p>
 474                 </td>
 475 <td>
 476                   <p>
 477                     For TCP: <a class="link" href="../../reference/basic_socket/shutdown.html" title="basic_socket::shutdown">ip::tcp::socket::shutdown()</a>
 478                   </p>
 479                   <p>
 480                     For UDP: <a class="link" href="../../reference/basic_socket/shutdown.html" title="basic_socket::shutdown">ip::udp::socket::shutdown()</a>
 481                   </p>
 482                   <p>
 483                     <a class="link" href="../../reference/basic_socket/shutdown.html" title="basic_socket::shutdown">basic_socket::shutdown()</a>
 484                   </p>
 485                 </td>
 486 </tr>
 487 <tr>
 488 <td>
 489                   <p>
 490                     <code class="computeroutput">sockatmark()</code>
 491                   </p>
 492                 </td>
 493 <td>
 494                   <p>
 495                     For TCP: <a class="link" href="../../reference/basic_socket/at_mark.html" title="basic_socket::at_mark">ip::tcp::socket::at_mark()</a>
 496                   </p>
 497                   <p>
 498                     <a class="link" href="../../reference/basic_socket/at_mark.html" title="basic_socket::at_mark">basic_socket::at_mark()</a>
 499                   </p>
 500                 </td>
 501 </tr>
 502 <tr>
 503 <td>
 504                   <p>
 505                     <code class="computeroutput">socket()</code>
 506                   </p>
 507                 </td>
 508 <td>
 509                   <p>
 510                     For TCP: <a class="link" href="../../reference/basic_socket/open.html" title="basic_socket::open">ip::tcp::acceptor::open()</a>,
 511                     <a class="link" href="../../reference/basic_socket/open.html" title="basic_socket::open">ip::tcp::socket::open()</a>
 512                   </p>
 513                   <p>
 514                     For UDP: <a class="link" href="../../reference/basic_socket/open.html" title="basic_socket::open">ip::udp::socket::open()</a>
 515                   </p>
 516                   <p>
 517                     <a class="link" href="../../reference/basic_socket/open.html" title="basic_socket::open">basic_socket::open()</a>
 518                   </p>
 519                 </td>
 520 </tr>
 521 <tr>
 522 <td>
 523                   <p>
 524                     <code class="computeroutput">socketpair()</code>
 525                   </p>
 526                 </td>
 527 <td>
 528                   <p>
 529                     <a class="link" href="../../reference/local__connect_pair.html" title="local::connect_pair">local::connect_pair()</a>
 530                   </p>
 531                   <p>
 532                     Note: POSIX operating systems only.
 533                   </p>
 534                 </td>
 535 </tr>
 536 </tbody>
 537 </table></div>
 538 </div>
 539 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 540 <td align="left"></td>
 541 <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2019 Christopher M. Kohlhoff<p>
 542         Distributed under the Boost Software License, Version 1.0. (See accompanying
 543         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
 544       </p>
 545 </div></td>
 546 </tr></table>
 547 <hr>
 548 <div class="spirit-nav">
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