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102 lines
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>UNIX Domain Sockets</title>
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
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<a accesskey="p" href="../posix.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../posix.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="stream_descriptor.html"><img src="../../../next.png" alt="Next"></a>
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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="asio.overview.posix.local"></a><a class="link" href="local.html" title="UNIX Domain Sockets">UNIX Domain Sockets</a>
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</h4></div></div></div>
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<p>
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Asio provides basic support for UNIX domain sockets (also known as local
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sockets). The simplest use involves creating a pair of connected sockets.
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The following code:
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</p>
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<pre class="programlisting"><span class="identifier">local</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket1</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
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<span class="identifier">local</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket2</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
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<span class="identifier">local</span><span class="special">::</span><span class="identifier">connect_pair</span><span class="special">(</span><span class="identifier">socket1</span><span class="special">,</span> <span class="identifier">socket2</span><span class="special">);</span>
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</pre>
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<p>
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will create a pair of stream-oriented sockets. To do the same for datagram-oriented
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sockets, use:
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</p>
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<pre class="programlisting"><span class="identifier">local</span><span class="special">::</span><span class="identifier">datagram_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket1</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
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<span class="identifier">local</span><span class="special">::</span><span class="identifier">datagram_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket2</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
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<span class="identifier">local</span><span class="special">::</span><span class="identifier">connect_pair</span><span class="special">(</span><span class="identifier">socket1</span><span class="special">,</span> <span class="identifier">socket2</span><span class="special">);</span>
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</pre>
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<p>
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A UNIX domain socket server may be created by binding an acceptor to an
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endpoint, in much the same way as one does for a TCP server:
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</p>
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<pre class="programlisting"><span class="special">::</span><span class="identifier">unlink</span><span class="special">(</span><span class="string">"/tmp/foobar"</span><span class="special">);</span> <span class="comment">// Remove previous binding.</span>
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<span class="identifier">local</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">ep</span><span class="special">(</span><span class="string">"/tmp/foobar"</span><span class="special">);</span>
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<span class="identifier">local</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">acceptor</span> <span class="identifier">acceptor</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">,</span> <span class="identifier">ep</span><span class="special">);</span>
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<span class="identifier">local</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
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<span class="identifier">acceptor</span><span class="special">.</span><span class="identifier">accept</span><span class="special">(</span><span class="identifier">socket</span><span class="special">);</span>
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</pre>
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<p>
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A client that connects to this server might look like:
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</p>
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<pre class="programlisting"><span class="identifier">local</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">ep</span><span class="special">(</span><span class="string">"/tmp/foobar"</span><span class="special">);</span>
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<span class="identifier">local</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
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<span class="identifier">socket</span><span class="special">.</span><span class="identifier">connect</span><span class="special">(</span><span class="identifier">ep</span><span class="special">);</span>
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</pre>
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<p>
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Transmission of file descriptors or credentials across UNIX domain sockets
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is not directly supported within Asio, but may be achieved by accessing
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the socket's underlying descriptor using the <a class="link" href="../../reference/basic_socket/native_handle.html" title="basic_socket::native_handle">native_handle()</a>
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member function.
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</p>
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<h6>
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<a name="asio.overview.posix.local.h0"></a>
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<span><a name="asio.overview.posix.local.see_also"></a></span><a class="link" href="local.html#asio.overview.posix.local.see_also">See
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Also</a>
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</h6>
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<p>
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<a class="link" href="../../reference/local__connect_pair.html" title="local::connect_pair">local::connect_pair</a>,
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<a class="link" href="../../reference/local__datagram_protocol.html" title="local::datagram_protocol">local::datagram_protocol</a>,
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<a class="link" href="../../reference/local__datagram_protocol/endpoint.html" title="local::datagram_protocol::endpoint">local::datagram_protocol::endpoint</a>,
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<a class="link" href="../../reference/local__datagram_protocol/socket.html" title="local::datagram_protocol::socket">local::datagram_protocol::socket</a>,
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<a class="link" href="../../reference/local__stream_protocol.html" title="local::stream_protocol">local::stream_protocol</a>,
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<a class="link" href="../../reference/local__stream_protocol/acceptor.html" title="local::stream_protocol::acceptor">local::stream_protocol::acceptor</a>,
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<a class="link" href="../../reference/local__stream_protocol/endpoint.html" title="local::stream_protocol::endpoint">local::stream_protocol::endpoint</a>,
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<a class="link" href="../../reference/local__stream_protocol/iostream.html" title="local::stream_protocol::iostream">local::stream_protocol::iostream</a>,
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<a class="link" href="../../reference/local__stream_protocol/socket.html" title="local::stream_protocol::socket">local::stream_protocol::socket</a>,
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<a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.unix_domain_sockets">UNIX domain
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sockets examples</a>.
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</p>
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<h6>
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<a name="asio.overview.posix.local.h1"></a>
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<span><a name="asio.overview.posix.local.notes"></a></span><a class="link" href="local.html#asio.overview.posix.local.notes">Notes</a>
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</h6>
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<p>
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UNIX domain sockets are only available at compile time if supported by
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the target operating system. A program may test for the macro <code class="computeroutput"><span class="identifier">ASIO_HAS_LOCAL_SOCKETS</span></code> to determine whether
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they are supported.
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</p>
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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>)
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</p>
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