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554 lines
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<title>The BSD Socket API and Boost.Asio</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
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<link rel="up" href="../networking.html" title="Networking">
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h4 class="title">
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<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
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Socket API and Boost.Asio</a>
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</h4></div></div></div>
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<p>
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The Boost.Asio library includes a low-level socket interface based on the
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BSD socket API, which is widely implemented and supported by extensive
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literature. It is also used as the basis for networking APIs in other languages,
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like Java. This low-level interface is designed to support the development
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of efficient and scalable applications. For example, it permits programmers
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to exert finer control over the number of system calls, avoid redundant
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data copying, minimise the use of resources like threads, and so on.
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</p>
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<p>
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Unsafe and error prone aspects of the BSD socket API are not included.
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For example, the use of <code class="computeroutput">int</code> to represent all sockets lacks
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type safety. The socket representation in Boost.Asio uses a distinct type
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for each protocol, e.g. for TCP one would use <code class="computeroutput">ip::tcp::socket</code>,
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and for UDP one uses <code class="computeroutput">ip::udp::socket</code>.
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</p>
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<p>
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The following table shows the mapping between the BSD socket API and Boost.Asio:
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</p>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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BSD Socket API Elements
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</p>
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</th>
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<th>
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<p>
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Equivalents in Boost.Asio
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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socket descriptor - <code class="computeroutput">int</code> (POSIX) or <code class="computeroutput">SOCKET</code>
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(Windows)
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</p>
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</td>
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<td>
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<p>
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For TCP: <a class="link" href="../../reference/ip__tcp/socket.html" title="ip::tcp::socket">ip::tcp::socket</a>,
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<a class="link" href="../../reference/ip__tcp/acceptor.html" title="ip::tcp::acceptor">ip::tcp::acceptor</a>
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</p>
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<p>
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For UDP: <a class="link" href="../../reference/ip__udp/socket.html" title="ip::udp::socket">ip::udp::socket</a>
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</p>
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<p>
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<a class="link" href="../../reference/basic_socket.html" title="basic_socket">basic_socket</a>,
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<a class="link" href="../../reference/basic_stream_socket.html" title="basic_stream_socket">basic_stream_socket</a>,
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<a class="link" href="../../reference/basic_datagram_socket.html" title="basic_datagram_socket">basic_datagram_socket</a>,
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<a class="link" href="../../reference/basic_raw_socket.html" title="basic_raw_socket">basic_raw_socket</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">in_addr</code>, <code class="computeroutput">in6_addr</code>
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</p>
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</td>
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<td>
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<p>
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<a class="link" href="../../reference/ip__address.html" title="ip::address">ip::address</a>,
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<a class="link" href="../../reference/ip__address.html" title="ip::address">ip::address_v4</a>,
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<a class="link" href="../../reference/ip__address.html" title="ip::address">ip::address_v6</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">sockaddr_in</code>, <code class="computeroutput">sockaddr_in6</code>
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</p>
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</td>
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<td>
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<p>
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For TCP: <a class="link" href="../../reference/ip__tcp/endpoint.html" title="ip::tcp::endpoint">ip::tcp::endpoint</a>
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</p>
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<p>
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For UDP: <a class="link" href="../../reference/ip__udp/endpoint.html" title="ip::udp::endpoint">ip::udp::endpoint</a>
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</p>
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<p>
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<a class="link" href="../../reference/ip__basic_endpoint.html" title="ip::basic_endpoint">ip::basic_endpoint</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">accept()</code>
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</p>
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</td>
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<td>
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<p>
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For TCP: <a class="link" href="../../reference/basic_socket_acceptor/accept.html" title="basic_socket_acceptor::accept">ip::tcp::acceptor::accept()</a>
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</p>
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<p>
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<a class="link" href="../../reference/basic_socket_acceptor/accept.html" title="basic_socket_acceptor::accept">basic_socket_acceptor::accept()</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">bind()</code>
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</p>
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</td>
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<td>
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<p>
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For TCP: <a class="link" href="../../reference/basic_socket/bind.html" title="basic_socket::bind">ip::tcp::acceptor::bind()</a>,
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<a class="link" href="../../reference/basic_socket/bind.html" title="basic_socket::bind">ip::tcp::socket::bind()</a>
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</p>
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<p>
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For UDP: <a class="link" href="../../reference/basic_socket/bind.html" title="basic_socket::bind">ip::udp::socket::bind()</a>
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</p>
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<p>
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<a class="link" href="../../reference/basic_socket/bind.html" title="basic_socket::bind">basic_socket::bind()</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">close()</code>
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</p>
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</td>
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<td>
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<p>
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For TCP: <a class="link" href="../../reference/basic_socket/close.html" title="basic_socket::close">ip::tcp::acceptor::close()</a>,
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<a class="link" href="../../reference/basic_socket/close.html" title="basic_socket::close">ip::tcp::socket::close()</a>
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</p>
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<p>
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For UDP: <a class="link" href="../../reference/basic_socket/close.html" title="basic_socket::close">ip::udp::socket::close()</a>
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</p>
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<p>
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<a class="link" href="../../reference/basic_socket/close.html" title="basic_socket::close">basic_socket::close()</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">connect()</code>
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</p>
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</td>
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<td>
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<p>
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For TCP: <a class="link" href="../../reference/basic_socket/connect.html" title="basic_socket::connect">ip::tcp::socket::connect()</a>
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</p>
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<p>
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For UDP: <a class="link" href="../../reference/basic_socket/connect.html" title="basic_socket::connect">ip::udp::socket::connect()</a>
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</p>
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<p>
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<a class="link" href="../../reference/basic_socket/connect.html" title="basic_socket::connect">basic_socket::connect()</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">getaddrinfo()</code>, <code class="computeroutput">gethostbyaddr()</code>, <code class="computeroutput">gethostbyname()</code>,
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<code class="computeroutput">getnameinfo()</code>, <code class="computeroutput">getservbyname()</code>, <code class="computeroutput">getservbyport()</code>
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</p>
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</td>
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<td>
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<p>
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For TCP: <a class="link" href="../../reference/ip__basic_resolver/resolve.html" title="ip::basic_resolver::resolve">ip::tcp::resolver::resolve()</a>,
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<a class="link" href="../../reference/ip__basic_resolver/async_resolve.html" title="ip::basic_resolver::async_resolve">ip::tcp::resolver::async_resolve()</a>
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</p>
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<p>
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For UDP: <a class="link" href="../../reference/ip__basic_resolver/resolve.html" title="ip::basic_resolver::resolve">ip::udp::resolver::resolve()</a>,
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<a class="link" href="../../reference/ip__basic_resolver/async_resolve.html" title="ip::basic_resolver::async_resolve">ip::udp::resolver::async_resolve()</a>
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</p>
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<p>
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<a class="link" href="../../reference/ip__basic_resolver/resolve.html" title="ip::basic_resolver::resolve">ip::basic_resolver::resolve()</a>,
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<a class="link" href="../../reference/ip__basic_resolver/async_resolve.html" title="ip::basic_resolver::async_resolve">ip::basic_resolver::async_resolve()</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">gethostname()</code>
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</p>
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</td>
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<td>
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<p>
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<a class="link" href="../../reference/ip__host_name.html" title="ip::host_name">ip::host_name()</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">getpeername()</code>
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</p>
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</td>
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<td>
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<p>
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For TCP: <a class="link" href="../../reference/basic_socket/remote_endpoint.html" title="basic_socket::remote_endpoint">ip::tcp::socket::remote_endpoint()</a>
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</p>
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<p>
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For UDP: <a class="link" href="../../reference/basic_socket/remote_endpoint.html" title="basic_socket::remote_endpoint">ip::udp::socket::remote_endpoint()</a>
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</p>
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<p>
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<a class="link" href="../../reference/basic_socket/remote_endpoint.html" title="basic_socket::remote_endpoint">basic_socket::remote_endpoint()</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">getsockname()</code>
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</p>
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</td>
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<td>
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<p>
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For TCP: <a class="link" href="../../reference/basic_socket/local_endpoint.html" title="basic_socket::local_endpoint">ip::tcp::acceptor::local_endpoint()</a>,
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<a class="link" href="../../reference/basic_socket/local_endpoint.html" title="basic_socket::local_endpoint">ip::tcp::socket::local_endpoint()</a>
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</p>
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<p>
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For UDP: <a class="link" href="../../reference/basic_socket/local_endpoint.html" title="basic_socket::local_endpoint">ip::udp::socket::local_endpoint()</a>
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</p>
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<p>
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<a class="link" href="../../reference/basic_socket/local_endpoint.html" title="basic_socket::local_endpoint">basic_socket::local_endpoint()</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">getsockopt()</code>
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</p>
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</td>
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<td>
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<p>
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For TCP: <a class="link" href="../../reference/basic_socket/get_option.html" title="basic_socket::get_option">ip::tcp::acceptor::get_option()</a>,
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<a class="link" href="../../reference/basic_socket/get_option.html" title="basic_socket::get_option">ip::tcp::socket::get_option()</a>
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</p>
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<p>
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For UDP: <a class="link" href="../../reference/basic_socket/get_option.html" title="basic_socket::get_option">ip::udp::socket::get_option()</a>
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</p>
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<p>
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<a class="link" href="../../reference/basic_socket/get_option.html" title="basic_socket::get_option">basic_socket::get_option()</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">inet_addr()</code>, <code class="computeroutput">inet_aton()</code>, <code class="computeroutput">inet_pton()</code>
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</p>
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</td>
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<td>
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<p>
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<a class="link" href="../../reference/ip__address/from_string.html" title="ip::address::from_string">ip::address::from_string()</a>,
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<a class="link" href="../../reference/ip__address/from_string.html" title="ip::address::from_string">ip::address_v4::from_string()</a>,
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<a class="link" href="../../reference/ip__address/from_string.html" title="ip::address::from_string">ip_address_v6::from_string()</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">inet_ntoa()</code>, <code class="computeroutput">inet_ntop()</code>
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</p>
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</td>
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<td>
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<p>
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<a class="link" href="../../reference/ip__address/to_string.html" title="ip::address::to_string">ip::address::to_string()</a>,
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<a class="link" href="../../reference/ip__address/to_string.html" title="ip::address::to_string">ip::address_v4::to_string()</a>,
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<a class="link" href="../../reference/ip__address/to_string.html" title="ip::address::to_string">ip_address_v6::to_string()</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">ioctl()</code>
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</p>
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</td>
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<td>
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<p>
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For TCP: <a class="link" href="../../reference/basic_socket/io_control.html" title="basic_socket::io_control">ip::tcp::socket::io_control()</a>
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</p>
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<p>
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For UDP: <a class="link" href="../../reference/basic_socket/io_control.html" title="basic_socket::io_control">ip::udp::socket::io_control()</a>
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</p>
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<p>
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<a class="link" href="../../reference/basic_socket/io_control.html" title="basic_socket::io_control">basic_socket::io_control()</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">listen()</code>
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</p>
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</td>
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<td>
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<p>
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For TCP: <a class="link" href="../../reference/basic_socket_acceptor/listen.html" title="basic_socket_acceptor::listen">ip::tcp::acceptor::listen()</a>
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</p>
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<p>
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<a class="link" href="../../reference/basic_socket_acceptor/listen.html" title="basic_socket_acceptor::listen">basic_socket_acceptor::listen()</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">poll()</code>, <code class="computeroutput">select()</code>, <code class="computeroutput">pselect()</code>
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</p>
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</td>
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<td>
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<p>
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<a class="link" href="../../reference/io_context/run.html" title="io_context::run">io_context::run()</a>,
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<a class="link" href="../../reference/io_context/run_one.html" title="io_context::run_one">io_context::run_one()</a>,
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<a class="link" href="../../reference/io_context/poll.html" title="io_context::poll">io_context::poll()</a>,
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<a class="link" href="../../reference/io_context/poll_one.html" title="io_context::poll_one">io_context::poll_one()</a>
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</p>
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<p>
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Note: in conjunction with asynchronous operations.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">readv()</code>, <code class="computeroutput">recv()</code>, <code class="computeroutput">read()</code>
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</p>
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</td>
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<td>
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<p>
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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>,
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<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>,
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<a class="link" href="../../reference/basic_stream_socket/receive.html" title="basic_stream_socket::receive">ip::tcp::socket::receive()</a>,
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<a class="link" href="../../reference/basic_stream_socket/async_receive.html" title="basic_stream_socket::async_receive">ip::tcp::socket::async_receive()</a>
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</p>
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<p>
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For UDP: <a class="link" href="../../reference/basic_datagram_socket/receive.html" title="basic_datagram_socket::receive">ip::udp::socket::receive()</a>,
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<a class="link" href="../../reference/basic_datagram_socket/async_receive.html" title="basic_datagram_socket::async_receive">ip::udp::socket::async_receive()</a>
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</p>
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<p>
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<a class="link" href="../../reference/basic_stream_socket/read_some.html" title="basic_stream_socket::read_some">basic_stream_socket::read_some()</a>,
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<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>,
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<a class="link" href="../../reference/basic_stream_socket/receive.html" title="basic_stream_socket::receive">basic_stream_socket::receive()</a>,
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<a class="link" href="../../reference/basic_stream_socket/async_receive.html" title="basic_stream_socket::async_receive">basic_stream_socket::async_receive()</a>,
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<a class="link" href="../../reference/basic_datagram_socket/receive.html" title="basic_datagram_socket::receive">basic_datagram_socket::receive()</a>,
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<a class="link" href="../../reference/basic_datagram_socket/async_receive.html" title="basic_datagram_socket::async_receive">basic_datagram_socket::async_receive()</a>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">recvfrom()</code>
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</p>
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</td>
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<td>
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<p>
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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>,
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<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>
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</p>
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<p>
|
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<a class="link" href="../../reference/basic_datagram_socket/receive_from.html" title="basic_datagram_socket::receive_from">basic_datagram_socket::receive_from()</a>,
|
|
<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>
|
|
</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput">send()</code>, <code class="computeroutput">write()</code>, <code class="computeroutput">writev()</code>
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</p>
|
|
</td>
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|
<td>
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|
<p>
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|
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>,
|
|
<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>,
|
|
<a class="link" href="../../reference/basic_stream_socket/send.html" title="basic_stream_socket::send">ip::tcp::socket::send()</a>,
|
|
<a class="link" href="../../reference/basic_stream_socket/async_send.html" title="basic_stream_socket::async_send">ip::tcp::socket::async_send()</a>
|
|
</p>
|
|
<p>
|
|
For UDP: <a class="link" href="../../reference/basic_datagram_socket/send.html" title="basic_datagram_socket::send">ip::udp::socket::send()</a>,
|
|
<a class="link" href="../../reference/basic_datagram_socket/async_send.html" title="basic_datagram_socket::async_send">ip::udp::socket::async_send()</a>
|
|
</p>
|
|
<p>
|
|
<a class="link" href="../../reference/basic_stream_socket/write_some.html" title="basic_stream_socket::write_some">basic_stream_socket::write_some()</a>,
|
|
<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>,
|
|
<a class="link" href="../../reference/basic_stream_socket/send.html" title="basic_stream_socket::send">basic_stream_socket::send()</a>,
|
|
<a class="link" href="../../reference/basic_stream_socket/async_send.html" title="basic_stream_socket::async_send">basic_stream_socket::async_send()</a>,
|
|
<a class="link" href="../../reference/basic_datagram_socket/send.html" title="basic_datagram_socket::send">basic_datagram_socket::send()</a>,
|
|
<a class="link" href="../../reference/basic_datagram_socket/async_send.html" title="basic_datagram_socket::async_send">basic_datagram_socket::async_send()</a>
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
<code class="computeroutput">sendto()</code>
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
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>,
|
|
<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>
|
|
</p>
|
|
<p>
|
|
<a class="link" href="../../reference/basic_datagram_socket/send_to.html" title="basic_datagram_socket::send_to">basic_datagram_socket::send_to()</a>,
|
|
<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>
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
<code class="computeroutput">setsockopt()</code>
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
For TCP: <a class="link" href="../../reference/basic_socket/set_option.html" title="basic_socket::set_option">ip::tcp::acceptor::set_option()</a>,
|
|
<a class="link" href="../../reference/basic_socket/set_option.html" title="basic_socket::set_option">ip::tcp::socket::set_option()</a>
|
|
</p>
|
|
<p>
|
|
For UDP: <a class="link" href="../../reference/basic_socket/set_option.html" title="basic_socket::set_option">ip::udp::socket::set_option()</a>
|
|
</p>
|
|
<p>
|
|
<a class="link" href="../../reference/basic_socket/set_option.html" title="basic_socket::set_option">basic_socket::set_option()</a>
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
<code class="computeroutput">shutdown()</code>
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
For TCP: <a class="link" href="../../reference/basic_socket/shutdown.html" title="basic_socket::shutdown">ip::tcp::socket::shutdown()</a>
|
|
</p>
|
|
<p>
|
|
For UDP: <a class="link" href="../../reference/basic_socket/shutdown.html" title="basic_socket::shutdown">ip::udp::socket::shutdown()</a>
|
|
</p>
|
|
<p>
|
|
<a class="link" href="../../reference/basic_socket/shutdown.html" title="basic_socket::shutdown">basic_socket::shutdown()</a>
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
<code class="computeroutput">sockatmark()</code>
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
For TCP: <a class="link" href="../../reference/basic_socket/at_mark.html" title="basic_socket::at_mark">ip::tcp::socket::at_mark()</a>
|
|
</p>
|
|
<p>
|
|
<a class="link" href="../../reference/basic_socket/at_mark.html" title="basic_socket::at_mark">basic_socket::at_mark()</a>
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
<code class="computeroutput">socket()</code>
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
For TCP: <a class="link" href="../../reference/basic_socket/open.html" title="basic_socket::open">ip::tcp::acceptor::open()</a>,
|
|
<a class="link" href="../../reference/basic_socket/open.html" title="basic_socket::open">ip::tcp::socket::open()</a>
|
|
</p>
|
|
<p>
|
|
For UDP: <a class="link" href="../../reference/basic_socket/open.html" title="basic_socket::open">ip::udp::socket::open()</a>
|
|
</p>
|
|
<p>
|
|
<a class="link" href="../../reference/basic_socket/open.html" title="basic_socket::open">basic_socket::open()</a>
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
<code class="computeroutput">socketpair()</code>
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
<a class="link" href="../../reference/local__connect_pair.html" title="local::connect_pair">local::connect_pair()</a>
|
|
</p>
|
|
<p>
|
|
Note: POSIX operating systems only.
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table></div>
|
|
</div>
|
|
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
|
<td align="left"></td>
|
|
<td align="right"><div class="copyright-footer">Copyright © 2003-2021 Christopher
|
|
M. Kohlhoff<p>
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
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>)
|
|
</p>
|
|
</div></td>
|
|
</tr></table>
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<hr>
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