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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="`dup(fd)`—Creates a new `OwnedFd` instance that shares the same underlying file description as `fd`."><meta name="keywords" content="rust, rustlang, rust-lang, dup"><title>dup in rustix::io - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc fn"><!--[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">&#9776;</button><a class="sidebar-logo" href="../../rustix/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../rustix/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In rustix::io</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../rustix/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="../index.html">rustix</a>::<wbr><a href="index.html">io</a>::<wbr><a class="fn" href="#">dup</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/rustix/io/dup.rs.html#32-34">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn dup&lt;Fd:&nbsp;<a class="trait" href="../fd/trait.AsFd.html" title="trait rustix::fd::AsFd">AsFd</a>&gt;(fd: Fd) -&gt; <a class="type" href="type.Result.html" title="type rustix::io::Result">Result</a>&lt;<a class="struct" href="../fd/struct.OwnedFd.html" title="struct rustix::fd::OwnedFd">OwnedFd</a>&gt;</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p><code>dup(fd)</code>—Creates a new <code>OwnedFd</code> instance that shares the same
underlying <a href="https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_258">file description</a> as <code>fd</code>.</p>
<p>This function does not set the <code>O_CLOEXEC</code> flag. To do a <code>dup</code> that does
set <code>O_CLOEXEC</code>, use <a href="fn.fcntl_dupfd_cloexec.html"><code>fcntl_dupfd_cloexec</code></a>.</p>
<p>POSIX guarantees that <code>dup</code> will use the lowest unused file descriptor,
however it is not safe in general to rely on this, as file descriptors may
be unexpectedly allocated on other threads or in libraries.</p>
<h2 id="references"><a href="#references">References</a></h2>
<ul>
<li><a href="https://pubs.opengroup.org/onlinepubs/9699919799/functions/dup.html">POSIX</a></li>
<li><a href="https://man7.org/linux/man-pages/man2/dup.2.html">Linux</a></li>
<li><a href="https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/dup.2.html">Apple</a></li>
</ul>
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