<!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="`pwrite(fd, bufs)`—Writes to a file at a given position."><title>pwrite in rustix::io - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.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-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-dd39b87e5fcfba68.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="1.81.0-nightly (4bc39f028 2024-06-26)" data-channel="nightly" data-search-js="search-0fe7219eb170c82e.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-df360f571f6edeae.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.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">0.38.34</span></h2></div><div class="sidebar-elems"><h2><a href="index.html">In rustix::io</a></h2></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"><h1>Function <a href="../index.html">rustix</a>::<wbr><a href="index.html">io</a>::<wbr><a class="fn" href="#">pwrite</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../../src/rustix/io/read_write.rs.html#156-158">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub fn pwrite<Fd: <a class="trait" href="../fd/trait.AsFd.html" title="trait rustix::fd::AsFd">AsFd</a>>(fd: Fd, buf: &[<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>], offset: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -> <a class="type" href="type.Result.html" title="type rustix::io::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>></code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p><code>pwrite(fd, bufs)</code>—Writes to a file at a given position.</p>
<p>Contrary to POSIX, on many popular platforms including Linux and FreeBSD,
if the file is opened in append mode, this ignores the offset appends the
data to the end of the file.</p>
<h2 id="references"><a class="doc-anchor" href="#references">§</a>References</h2>
<ul>
<li><a href="https://pubs.opengroup.org/onlinepubs/9699919799/functions/pwrite.html">POSIX</a></li>
<li><a href="https://man7.org/linux/man-pages/man2/pwrite.2.html">Linux</a></li>
<li><a href="https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/pwrite.2.html">Apple</a></li>
<li><a href="https://man.freebsd.org/cgi/man.cgi?query=pwrite&sektion=2">FreeBSD</a></li>
<li><a href="https://man.netbsd.org/pwrite.2">NetBSD</a></li>
<li><a href="https://man.openbsd.org/pwrite.2">OpenBSD</a></li>
<li><a href="https://man.dragonflybsd.org/?command=pwrite&section=2">DragonFly BSD</a></li>
<li><a href="https://illumos.org/man/2/pwrite">illumos</a></li>
</ul>
</div></details></section></div></main></body></html>