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<p class='location'>Struct TcpListener</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.bind">bind</a><a href="#method.poll_accept">poll_accept</a><a href="#method.poll_accept_std">poll_accept_std</a><a href="#method.from_std">from_std</a><a href="#method.local_addr">local_addr</a><a href="#method.incoming">incoming</a><a href="#method.ttl">ttl</a><a href="#method.set_ttl">set_ttl</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-AsRawFd">AsRawFd</a><a href="#impl-Debug">Debug</a></div></div><p class='location'><a href='index.html'>tokio_tcp</a></p><script>window.sidebarCurrent = {name: 'TcpListener', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Struct <a href='index.html'>tokio_tcp</a>::<wbr><a class="struct" href=''>TcpListener</a></span><span class='out-of-band'><span id='render-detail'>
<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
[<span class='inner'>&#x2212;</span>]
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</span><a class='srclink' href='../src/tokio_tcp/listener.rs.html#19-21' title='goto source code'>[src]</a></span></h1>
<pre class='rust struct'>pub struct TcpListener { /* fields omitted */ }</pre><div class='docblock'><p>An I/O object representing a TCP socket listening for incoming connections.</p>
<p>This object can be converted into a stream of incoming connections for
various forms of processing.</p>
</div>
<h2 id='methods' class='small-section-header'>
Methods<a href='#methods' class='anchor'></a>
</h2>
<h3 id='impl' class='impl'><span class='in-band'><code>impl <a class="struct" href="../tokio_tcp/struct.TcpListener.html" title="struct tokio_tcp::TcpListener">TcpListener</a></code><a href='#impl' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_tcp/listener.rs.html#23-229' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.bind' class="method"><span id='bind.v' class='invisible'><code>pub fn <a href='#method.bind' class='fnname'>bind</a>(addr: &amp;<a class="enum" href="https://doc.rust-lang.org/nightly/std/net/addr/enum.SocketAddr.html" title="enum std::net::addr::SocketAddr">SocketAddr</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="struct" href="../tokio_tcp/struct.TcpListener.html" title="struct tokio_tcp::TcpListener">TcpListener</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_tcp/listener.rs.html#28-31' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Create a new TCP listener associated with this event loop.</p>
<p>The TCP listener will bind to the provided <code>addr</code> address, if available.
If the result is <code>Ok</code>, the socket has successfully bound.</p>
</div><h4 id='method.poll_accept' class="method"><span id='poll_accept.v' class='invisible'><code>pub fn <a href='#method.poll_accept' class='fnname'>poll_accept</a>(&amp;mut self) -&gt; <a class="type" href="../futures/poll/type.Poll.html" title="type futures::poll::Poll">Poll</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a><a class="struct" href="../tokio_tcp/struct.TcpStream.html" title="struct tokio_tcp::TcpStream">TcpStream</a>, <a class="enum" href="https://doc.rust-lang.org/nightly/std/net/addr/enum.SocketAddr.html" title="enum std::net::addr::SocketAddr">SocketAddr</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_tcp/listener.rs.html#60-67' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Attempt to accept a connection and create a new connected <code>TcpStream</code> if
successful.</p>
<p>Note that typically for simple usage it's easier to treat incoming
connections as a <code>Stream</code> of <code>TcpStream</code>s with the <code>incoming</code> method
below.</p>
<h1 id="return" class="section-header"><a href="#return">Return</a></h1>
<p>On success, returns <code>Ok(Async::Ready((socket, addr)))</code>.</p>
<p>If the listener is not ready to accept, the method returns
<code>Ok(Async::NotReady)</code> and arranges for the current task to receive a
notification when the listener becomes ready to accept.</p>
<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
<p>This function will panic if called from outside of a task context.</p>
</div><h4 id='method.poll_accept_std' class="method"><span id='poll_accept_std.v' class='invisible'><code>pub fn <a href='#method.poll_accept_std' class='fnname'>poll_accept_std</a>(&amp;mut self) -&gt; <a class="type" href="../futures/poll/type.Poll.html" title="type futures::poll::Poll">Poll</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a><a class="struct" href="https://doc.rust-lang.org/nightly/std/net/tcp/struct.TcpStream.html" title="struct std::net::tcp::TcpStream">TcpStream</a>, <a class="enum" href="https://doc.rust-lang.org/nightly/std/net/addr/enum.SocketAddr.html" title="enum std::net::addr::SocketAddr">SocketAddr</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_tcp/listener.rs.html#113-124' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Attempt to accept a connection and create a new connected <code>TcpStream</code> if
successful.</p>
<p>This function is the same as <code>accept</code> above except that it returns a
<code>std::net::TcpStream</code> instead of a <code>tokio::net::TcpStream</code>. This in turn
can then allow for the TCP stream to be associated with a different
reactor than the one this <code>TcpListener</code> is associated with.</p>
<h1 id="return-1" class="section-header"><a href="#return-1">Return</a></h1>
<p>On success, returns <code>Ok(Async::Ready((socket, addr)))</code>.</p>
<p>If the listener is not ready to accept, the method returns
<code>Ok(Async::NotReady)</code> and arranges for the current task to receive a
notification when the listener becomes ready to accept.</p>
<h1 id="panics-1" class="section-header"><a href="#panics-1">Panics</a></h1>
<p>This function will panic if called from outside of a task context.</p>
</div><h4 id='method.from_std' class="method"><span id='from_std.v' class='invisible'><code>pub fn <a href='#method.from_std' class='fnname'>from_std</a>(listener: <a class="struct" href="https://doc.rust-lang.org/nightly/std/net/tcp/struct.TcpListener.html" title="struct std::net::tcp::TcpListener">TcpListener</a>, handle: &amp;<a class="struct" href="../tokio_reactor/struct.Handle.html" title="struct tokio_reactor::Handle">Handle</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="struct" href="../tokio_tcp/struct.TcpListener.html" title="struct tokio_tcp::TcpListener">TcpListener</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_tcp/listener.rs.html#173-179' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Create a new TCP listener from the standard library's TCP listener.</p>
<p>This method can be used when the <code>Handle::tcp_listen</code> method isn't
sufficient because perhaps some more configuration is needed in terms of
before the calls to <code>bind</code> and <code>listen</code>.</p>
<p>This API is typically paired with the <code>net2</code> crate and the <code>TcpBuilder</code>
type to build up and customize a listener before it's shipped off to the
backing event loop. This allows configuration of options like
<code>SO_REUSEPORT</code>, binding to multiple addresses, etc.</p>
<p>The <code>addr</code> argument here is one of the addresses that <code>listener</code> is
bound to and the listener will only be guaranteed to accept connections
of the same address type currently.</p>
<p>Finally, the <code>handle</code> argument is the event loop that this listener will
be bound to.
Use <code>Handle::default()</code> to lazily bind to an event loop, just like <code>bind</code> does.</p>
<p>The platform specific behavior of this function looks like:</p>
<ul>
<li>
<p>On Unix, the socket is placed into nonblocking mode and connections
can be accepted as normal</p>
</li>
<li>
<p>On Windows, the address is stored internally and all future accepts
will only be for the same IP version as <code>addr</code> specified. That is, if
<code>addr</code> is an IPv4 address then all sockets accepted will be IPv4 as
well (same for IPv6).</p>
</li>
</ul>
</div><h4 id='method.local_addr' class="method"><span id='local_addr.v' class='invisible'><code>pub fn <a href='#method.local_addr' class='fnname'>local_addr</a>(&amp;self) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/std/net/addr/enum.SocketAddr.html" title="enum std::net::addr::SocketAddr">SocketAddr</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_tcp/listener.rs.html#190-192' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Returns the local address that this listener is bound to.</p>
<p>This can be useful, for example, when binding to port 0 to figure out
which port was actually bound.</p>
</div><h4 id='method.incoming' class="method"><span id='incoming.v' class='invisible'><code>pub fn <a href='#method.incoming' class='fnname'>incoming</a>(self) -&gt; <a class="struct" href="../tokio_tcp/struct.Incoming.html" title="struct tokio_tcp::Incoming">Incoming</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_tcp/listener.rs.html#209-211' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Consumes this listener, returning a stream of the sockets this listener
accepts.</p>
<p>This method returns an implementation of the <code>Stream</code> trait which
resolves to the sockets the are accepted on this listener.</p>
<h1 id="errors" class="section-header"><a href="#errors">Errors</a></h1>
<p>Note that accepting a connection can lead to various errors and not all of them are
necessarily fatal for example having too many open file descriptors or the other side
closing the connection while it waits in an accept queue. These would terminate the stream
if not handled in any way.</p>
<p>If aiming for production, decision what to do about them must be made. The
<a href="https://crates.io/crates/tk-listen"><code>tk-listen</code></a> crate might be of some help.</p>
</div><h4 id='method.ttl' class="method"><span id='ttl.v' class='invisible'><code>pub fn <a href='#method.ttl' class='fnname'>ttl</a>(&amp;self) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_tcp/listener.rs.html#218-220' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Gets the value of the <code>IP_TTL</code> option for this socket.</p>
<p>For more information about this option, see <a href="#method.set_ttl"><code>set_ttl</code></a>.</p>
</div><h4 id='method.set_ttl' class="method"><span id='set_ttl.v' class='invisible'><code>pub fn <a href='#method.set_ttl' class='fnname'>set_ttl</a>(&amp;self, ttl: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_tcp/listener.rs.html#226-228' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Sets the value for the <code>IP_TTL</code> option on this socket.</p>
<p>This value sets the time-to-live field that is used in every packet sent
from this socket.</p>
</div></div>
<h2 id='implementations' class='small-section-header'>
Trait Implementations<a href='#implementations' class='anchor'></a>
</h2>
<h3 id='impl-AsRawFd' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/std/sys/unix/ext/io/trait.AsRawFd.html" title="trait std::sys::unix::ext::io::AsRawFd">AsRawFd</a> for <a class="struct" href="../tokio_tcp/struct.TcpListener.html" title="struct tokio_tcp::TcpListener">TcpListener</a></code><a href='#impl-AsRawFd' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_tcp/listener.rs.html#242-246' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.as_raw_fd' class="method"><span id='as_raw_fd.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/std/sys/unix/ext/io/trait.AsRawFd.html#tymethod.as_raw_fd' class='fnname'>as_raw_fd</a>(&amp;self) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/std/sys/unix/ext/io/type.RawFd.html" title="type std::sys::unix::ext::io::RawFd">RawFd</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_tcp/listener.rs.html#243-245' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Extracts the raw file descriptor. <a href="https://doc.rust-lang.org/nightly/std/sys/unix/ext/io/trait.AsRawFd.html#tymethod.as_raw_fd">Read more</a></p>
</div></div><h3 id='impl-Debug' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../tokio_tcp/struct.TcpListener.html" title="struct tokio_tcp::TcpListener">TcpListener</a></code><a href='#impl-Debug' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_tcp/listener.rs.html#231-235' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_tcp/listener.rs.html#232-234' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div></section>
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