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<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `dup` fn in crate `nix`."><metaname="keywords"content="rust, rustlang, rust-lang, dup"><title>nix::unistd::dup - Rust</title><linkrel="stylesheet"type="text/css"href="../../normalize.css"><linkrel="stylesheet"type="text/css"href="../../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../../dark.css"><linkrel="stylesheet"type="text/css"href="../../light.css"id="themeStyle"><scriptsrc="../../storage.js"></script><noscript><linkrel="stylesheet"href="../../noscript.css"></noscript><linkrel="shortcut icon"href="../../favicon.ico"><styletype="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><bodyclass="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><ahref='../../nix/index.html'><divclass='logo-container'><imgsrc='../../rust-logo.png'alt='logo'></div></a><divclass="sidebar-elems"><pclass='location'><ahref='../index.html'>nix</a>::<wbr><ahref='index.html'>unistd</a></p><script>window.sidebarCurrent={name:'dup',ty:'fn',relpath:''};</script><scriptdefersrc="sidebar-items.js"></script></div></nav><divclass="theme-picker"><buttonid="theme-picker"aria-label="Pick another theme!"><imgsrc="../../brush.svg"width="18"alt="Pick another theme!"></button><divid="theme-choices"></div></div><scriptsrc="../../theme.js"></script><navclass="sub"><formclass="search-form js-only"><divclass="search-container"><div><selectid="crate-search"><optionvalue="All crates">All crates</option></select><inputclass="search-input"name="search"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"></div><aid="settings-menu"href="../../settings.html"><imgsrc="../../wheel.svg"width="18"alt="Change settings"></a></div></form></nav><sectionid="main"class="content"><h1class='fqn'><spanclass='out-of-band'><spanid='render-detail'><aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass='inner'>−</span>]</a></span><aclass='srclink'href='../../src/nix/unistd.rs.html#353-357'title='goto source code'>[src]</a></span><spanclass='in-band'>Function <ahref='../index.html'>nix</a>::<wbr><ahref='index.html'>unistd</a>::<wbr><aclass="fn"href=''>dup</a></span></h1><preclass='rust fn'>pub fn dup(oldfd: <aclass="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>) -><aclass="type"href="../../nix/type.Result.html"title="type nix::Result">Result</a><<aclass="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>></pre><divclass='docblock'><p>Create a copy of the specified file descriptor (see
<p>The new file descriptor will be have a new index but refer to the same
resource as the old file descriptor and the old and new file descriptors may
be used interchangeably. The new and old file descriptor share the same
underlying resource, offset, and file status flags. The actual index used
for the file descriptor will be the lowest fd index that is available.</p>
<p>The two file descriptors do not share file descriptor flags (e.g. <code>OFlag::FD_CLOEXEC</code>).</p>
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