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<html>
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<title>UNIX Domain Sockets</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="asio.overview.posix.local"></a><a class="link" href="local.html" title="UNIX Domain Sockets">UNIX Domain Sockets</a>
</h4></div></div></div>
<p>
Asio provides basic support for UNIX domain sockets (also known as local
sockets). The simplest use involves creating a pair of connected sockets.
The following code:
</p>
<pre class="programlisting">local::stream_protocol::socket socket1(my_io_context);
local::stream_protocol::socket socket2(my_io_context);
local::connect_pair(socket1, socket2);
</pre>
<p>
will create a pair of stream-oriented sockets. To do the same for datagram-oriented
sockets, use:
</p>
<pre class="programlisting">local::datagram_protocol::socket socket1(my_io_context);
local::datagram_protocol::socket socket2(my_io_context);
local::connect_pair(socket1, socket2);
</pre>
<p>
A UNIX domain socket server may be created by binding an acceptor to an
endpoint, in much the same way as one does for a TCP server:
</p>
<pre class="programlisting">::unlink("/tmp/foobar"); // Remove previous binding.
local::stream_protocol::endpoint ep("/tmp/foobar");
local::stream_protocol::acceptor acceptor(my_io_context, ep);
local::stream_protocol::socket socket(my_io_context);
acceptor.accept(socket);
</pre>
<p>
A client that connects to this server might look like:
</p>
<pre class="programlisting">local::stream_protocol::endpoint ep("/tmp/foobar");
local::stream_protocol::socket socket(my_io_context);
socket.connect(ep);
</pre>
<p>
Transmission of file descriptors or credentials across UNIX domain sockets
is not directly supported within Asio, but may be achieved by accessing
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>
member function.
</p>
<h6>
<a name="asio.overview.posix.local.h0"></a>
<span><a name="asio.overview.posix.local.see_also"></a></span><a class="link" href="local.html#asio.overview.posix.local.see_also">See
Also</a>
</h6>
<p>
<a class="link" href="../../reference/local__connect_pair.html" title="local::connect_pair">local::connect_pair</a>,
<a class="link" href="../../reference/local__datagram_protocol.html" title="local::datagram_protocol">local::datagram_protocol</a>,
<a class="link" href="../../reference/local__datagram_protocol/endpoint.html" title="local::datagram_protocol::endpoint">local::datagram_protocol::endpoint</a>,
<a class="link" href="../../reference/local__datagram_protocol/socket.html" title="local::datagram_protocol::socket">local::datagram_protocol::socket</a>,
<a class="link" href="../../reference/local__stream_protocol.html" title="local::stream_protocol">local::stream_protocol</a>,
<a class="link" href="../../reference/local__stream_protocol/acceptor.html" title="local::stream_protocol::acceptor">local::stream_protocol::acceptor</a>,
<a class="link" href="../../reference/local__stream_protocol/endpoint.html" title="local::stream_protocol::endpoint">local::stream_protocol::endpoint</a>,
<a class="link" href="../../reference/local__stream_protocol/iostream.html" title="local::stream_protocol::iostream">local::stream_protocol::iostream</a>,
<a class="link" href="../../reference/local__stream_protocol/socket.html" title="local::stream_protocol::socket">local::stream_protocol::socket</a>,
<a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.unix_domain_sockets">UNIX domain
sockets examples</a>.
</p>
<h6>
<a name="asio.overview.posix.local.h1"></a>
<span><a name="asio.overview.posix.local.notes"></a></span><a class="link" href="local.html#asio.overview.posix.local.notes">Notes</a>
</h6>
<p>
UNIX domain sockets are only available at compile time if supported by
the target operating system. A program may test for the macro <code class="computeroutput">ASIO_HAS_LOCAL_SOCKETS</code>
to determine whether they are supported.
</p>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2020 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>)
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