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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'>
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[<span class='inner'>−</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>
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<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>
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<p>This object can be converted into a stream of incoming connections for
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various forms of processing.</p>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<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>
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<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: &<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="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><<a class="struct" href="../tokio_tcp/struct.TcpListener.html" title="struct tokio_tcp::TcpListener">TcpListener</a>></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>
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<div class='docblock'><p>Create a new TCP listener associated with this event loop.</p>
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<p>The TCP listener will bind to the provided <code>addr</code> address, if available.
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If the result is <code>Ok</code>, the socket has successfully bound.</p>
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</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>(&mut self) -> <a class="type" href="../futures/poll/type.Poll.html" title="type futures::poll::Poll">Poll</a><<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>></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>
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<div class='docblock'><p>Attempt to accept a connection and create a new connected <code>TcpStream</code> if
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successful.</p>
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<p>Note that typically for simple usage it's easier to treat incoming
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connections as a <code>Stream</code> of <code>TcpStream</code>s with the <code>incoming</code> method
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below.</p>
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<h1 id="return" class="section-header"><a href="#return">Return</a></h1>
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<p>On success, returns <code>Ok(Async::Ready((socket, addr)))</code>.</p>
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<p>If the listener is not ready to accept, the method returns
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<code>Ok(Async::NotReady)</code> and arranges for the current task to receive a
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notification when the listener becomes ready to accept.</p>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<p>This function will panic if called from outside of a task context.</p>
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</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>(&mut self) -> <a class="type" href="../futures/poll/type.Poll.html" title="type futures::poll::Poll">Poll</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/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>></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>
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<div class='docblock'><p>Attempt to accept a connection and create a new connected <code>TcpStream</code> if
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successful.</p>
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<p>This function is the same as <code>accept</code> above except that it returns a
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<code>std::net::TcpStream</code> instead of a <code>tokio::net::TcpStream</code>. This in turn
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can then allow for the TCP stream to be associated with a different
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reactor than the one this <code>TcpListener</code> is associated with.</p>
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<h1 id="return-1" class="section-header"><a href="#return-1">Return</a></h1>
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<p>On success, returns <code>Ok(Async::Ready((socket, addr)))</code>.</p>
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<p>If the listener is not ready to accept, the method returns
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<code>Ok(Async::NotReady)</code> and arranges for the current task to receive a
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||
notification when the listener becomes ready to accept.</p>
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<h1 id="panics-1" class="section-header"><a href="#panics-1">Panics</a></h1>
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<p>This function will panic if called from outside of a task context.</p>
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</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: &<a class="struct" href="../tokio_reactor/struct.Handle.html" title="struct tokio_reactor::Handle">Handle</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><<a class="struct" href="../tokio_tcp/struct.TcpListener.html" title="struct tokio_tcp::TcpListener">TcpListener</a>></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>
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<div class='docblock'><p>Create a new TCP listener from the standard library's TCP listener.</p>
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<p>This method can be used when the <code>Handle::tcp_listen</code> method isn't
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sufficient because perhaps some more configuration is needed in terms of
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before the calls to <code>bind</code> and <code>listen</code>.</p>
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<p>This API is typically paired with the <code>net2</code> crate and the <code>TcpBuilder</code>
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type to build up and customize a listener before it's shipped off to the
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backing event loop. This allows configuration of options like
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<code>SO_REUSEPORT</code>, binding to multiple addresses, etc.</p>
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<p>The <code>addr</code> argument here is one of the addresses that <code>listener</code> is
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bound to and the listener will only be guaranteed to accept connections
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of the same address type currently.</p>
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<p>Finally, the <code>handle</code> argument is the event loop that this listener will
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be bound to.
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Use <code>Handle::default()</code> to lazily bind to an event loop, just like <code>bind</code> does.</p>
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||
<p>The platform specific behavior of this function looks like:</p>
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<ul>
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<li>
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<p>On Unix, the socket is placed into nonblocking mode and connections
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can be accepted as normal</p>
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</li>
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<li>
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<p>On Windows, the address is stored internally and all future accepts
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will only be for the same IP version as <code>addr</code> specified. That is, if
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<code>addr</code> is an IPv4 address then all sockets accepted will be IPv4 as
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well (same for IPv6).</p>
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</li>
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</ul>
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</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>(&self) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</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>></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>
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<div class='docblock'><p>Returns the local address that this listener is bound to.</p>
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<p>This can be useful, for example, when binding to port 0 to figure out
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which port was actually bound.</p>
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||
</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) -> <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>
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<div class='docblock'><p>Consumes this listener, returning a stream of the sockets this listener
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accepts.</p>
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<p>This method returns an implementation of the <code>Stream</code> trait which
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resolves to the sockets the are accepted on this listener.</p>
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<h1 id="errors" class="section-header"><a href="#errors">Errors</a></h1>
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<p>Note that accepting a connection can lead to various errors and not all of them are
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||
necessarily fatal ‒ for example having too many open file descriptors or the other side
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closing the connection while it waits in an accept queue. These would terminate the stream
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||
if not handled in any way.</p>
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<p>If aiming for production, decision what to do about them must be made. The
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||
<a href="https://crates.io/crates/tk-listen"><code>tk-listen</code></a> crate might be of some help.</p>
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||
</div><h4 id='method.ttl' class="method"><span id='ttl.v' class='invisible'><code>pub fn <a href='#method.ttl' class='fnname'>ttl</a>(&self) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>></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>
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<div class='docblock'><p>Gets the value of the <code>IP_TTL</code> option for this socket.</p>
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||
<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>(&self, ttl: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>></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>
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<div class='docblock'><p>Sets the value for the <code>IP_TTL</code> option on this socket.</p>
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<p>This value sets the time-to-live field that is used in every packet sent
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||
from this socket.</p>
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</div></div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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</h2>
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<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>
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<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>(&self) -> <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>
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||
<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>
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<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>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <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>
|
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<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>
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