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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Asynchronous signal handling for Tokio."><title>tokio::signal - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="tokio" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../static.files/storage-59e33391.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../tokio/index.html">tokio</a><span class="version">1.42.0</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module signal</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#examples" title="Examples">Examples</a></li></ul><h3><a href="#modules">Module Items</a></h3><ul class="block"><li><a href="#modules" title="Modules">Modules</a></li><li><a href="#functions" title="Functions">Functions</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="../index.html">In crate tokio</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../index.html">tokio</a></span><h1>Module <span>signal</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/tokio/signal/mod.rs.html#1-100">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Asynchronous signal handling for Tokio.</p>
<p>Note that signal handling is in general a very tricky topic and should be
used with great care. This crate attempts to implement ‘best practice’ for
signal handling, but it should be evaluated for your own applications’ needs
to see if it’s suitable.</p>
<p>There are some fundamental limitations of this crate documented on the OS
specific structures, as well.</p>
<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
<p>Print on “ctrl-c” notification.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tokio::signal;
<span class="attr">#[tokio::main]
</span><span class="kw">async fn </span>main() -&gt; <span class="prelude-ty">Result</span>&lt;(), Box&lt;<span class="kw">dyn </span>std::error::Error&gt;&gt; {
signal::ctrl_c().<span class="kw">await</span><span class="question-mark">?</span>;
<span class="macro">println!</span>(<span class="string">"ctrl-c received!"</span>);
<span class="prelude-val">Ok</span>(())
}</code></pre></div>
<p>Wait for <code>SIGHUP</code> on Unix</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tokio::signal::unix::{signal, SignalKind};
<span class="attr">#[tokio::main]
</span><span class="kw">async fn </span>main() -&gt; <span class="prelude-ty">Result</span>&lt;(), Box&lt;<span class="kw">dyn </span>std::error::Error&gt;&gt; {
<span class="comment">// An infinite stream of hangup signals.
</span><span class="kw">let </span><span class="kw-2">mut </span>stream = signal(SignalKind::hangup())<span class="question-mark">?</span>;
<span class="comment">// Print whenever a HUP signal is received
</span><span class="kw">loop </span>{
stream.recv().<span class="kw">await</span>;
<span class="macro">println!</span>(<span class="string">"got signal HUP"</span>);
}
}</code></pre></div>
</div></details><h2 id="modules" class="section-header">Modules<a href="#modules" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="mod" href="unix/index.html" title="mod tokio::signal::unix">unix</a></div><div class="desc docblock-short">Unix-specific types for signal handling.</div></li></ul><h2 id="functions" class="section-header">Functions<a href="#functions" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="fn" href="fn.ctrl_c.html" title="fn tokio::signal::ctrl_c">ctrl_c</a></div><div class="desc docblock-short">Completes when a “ctrl-c” notification is sent to the process.</div></li></ul></section></div></main></body></html>