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<title>s6-networking: the s6-tcpserver6-socketbinder program</title>
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<p>
<a href="index.html">s6-networking</a><br />
<a href="http://skarnet.org/software/">Software</a><br />
<a href="http://skarnet.org/">skarnet.org</a>
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<h1> The <tt>s6-tcpserver6-socketbinder</tt> program </h1>
<p>
<tt>s6-tcpserver6-socketbinder</tt> binds an INET domain
socket to an IPv6 address and port, then executes a program.
</p>
<h2> Interface </h2>
<pre>
s6-tcpserver6-socketbinder [ -d | -D ] [ -b <em>backlog</em> ] <em>ip</em> <em>port</em> <em>prog...</em>
</pre>
<ul>
<li> s6-tcpserver6-socketbinder creates an TCP socket
and binds it to IPv6 address <em>ip</em>, port <em>port</em>.
It prepares the socket to accept connections by calling
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/listen.html">listen()</a>. </li>
<li> It then execs into <em>prog...</em> with the open socket
as its standard input. </li>
<h2> Options </h2>
<ul>
<li> <tt>-d</tt> : allow instant rebinding to the same IP and port
even if it has been used not long ago - this is the SO_REUSEADDR flag to
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html">setsockopt()</a>
and is generally used with server programs. This is the default. </li>
<li> <tt>-D</tt> : disallow instant rebinding to the same path. </li>
<li> <tt>-b <em>backlog</em></tt> : set a maximum of
<em>backlog</em> backlog connections on the socket. Extra
connection attempts will rejected by the kernel. </li>
</ul>
<h2> Notes </h2>
<ul>
<li> s6-tcpserver6-socketbinder is part of a set of basic blocks used to
build a flexible TCP/IPv6 super-server. It normally should be given a
command line crafted to make it execute into
<a href="s6-tcpserver6d.html">s6-tcpserver6d</a> to accept connections
from clients, or into a program such as
<a href="http://skarnet.org/software/s6/s6-applyuidgid.html">s6-applyuidgid</a>
to drop privileges before doing so. </li>
<li> The <a href="s6-tcpserver6.html">s6-tcpserver6</a> program does
exactly this. It implements
a full TCP/IPv6 super-server by building a command line starting with
s6-tcpserver6-socketbinder and ending with s6-tcpserver6d followed by the
application program, and executing into it. </li>
</ul>
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