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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`."><title>dup in rustix::io - 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="rustix" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.0 (9fc6b4312 2025-01-07)" data-channel="1.84.0" 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 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" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../rustix/index.html">rustix</a><span class="version">0.38.37</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">dup</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#references" title="References">References</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="index.html">In rustix::<wbr>io</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">rustix</a>::<wbr><a href="index.html">io</a></span><h1>Function <span class="fn">dup</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/rustix/io/dup.rs.html#44-46">Source</a> </span></div><pre class="rust item-decl"><code>pub fn dup<Fd: <a class="trait" href="../fd/trait.AsFd.html" title="trait rustix::fd::AsFd">AsFd</a>>(fd: Fd) -> <a class="type" href="type.Result.html" title="type rustix::io::Result">Result</a><<a class="struct" href="../fd/struct.OwnedFd.html" title="struct rustix::fd::OwnedFd">OwnedFd</a>></code></pre><details class="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
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underlying <a href="https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/V1_chap03.html#tag_03_258">file description</a> as <code>fd</code>.</p>
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<p>This function does not set the <code>O_CLOEXEC</code> flag. To do a <code>dup</code> that does
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set <code>O_CLOEXEC</code>, use <a href="fn.fcntl_dupfd_cloexec.html" title="fn rustix::io::fcntl_dupfd_cloexec"><code>fcntl_dupfd_cloexec</code></a>.</p>
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<p>POSIX guarantees that <code>dup</code> will use the lowest unused file descriptor,
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however it is not safe in general to rely on this, as file descriptors may
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be unexpectedly allocated on other threads or in libraries.</p>
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<h2 id="references"><a class="doc-anchor" href="#references">§</a>References</h2>
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<ul>
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<li><a href="https://pubs.opengroup.org/onlinepubs/9799919799/functions/dup.html">POSIX</a></li>
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<li><a href="https://man7.org/linux/man-pages/man2/dup.2.html">Linux</a></li>
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<li><a href="https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/dup.2.html">Apple</a></li>
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<li><a href="https://man.freebsd.org/cgi/man.cgi?query=dup&sektion=2">FreeBSD</a></li>
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<li><a href="https://man.netbsd.org/dup.2">NetBSD</a></li>
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<li><a href="https://man.openbsd.org/dup.2">OpenBSD</a></li>
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<li><a href="https://man.dragonflybsd.org/?command=dup&section=2">DragonFly BSD</a></li>
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<li><a href="https://illumos.org/man/2/dup">illumos</a></li>
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<li><a href="https://www.gnu.org/software/libc/manual/html_node/Duplicating-Descriptors.html">glibc</a></li>
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</ul>
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</div></details></section></div></main></body></html> |