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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="A trait to express the ability to construct an object from a raw file descriptor."><title>FromRawFd in rustix::fd - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-ac92e1bbe349e143.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="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><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 trait"><!--[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">☰</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><h2 class="location"><a href="#">FromRawFd</a></h2><div class="sidebar-elems"><section><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.from_raw_fd">from_raw_fd</a></li></ul><h3><a href="#object-safety">Object Safety</a></h3><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In rustix::fd</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../rustix/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Trait <a href="../index.html">rustix</a>::<wbr><a href="index.html">fd</a>::<wbr><a class="trait" href="#">FromRawFd</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><span class="since" title="Stable since Rust version 1.1.0">1.1.0</span> · <a class="src" href="https://doc.rust-lang.org/1.76.0/src/std/os/fd/raw.rs.html#72">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub trait FromRawFd {
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// Required method
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unsafe fn <a href="#tymethod.from_raw_fd" class="fn">from_raw_fd</a>(fd: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.i32.html">i32</a>) -> Self;
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A trait to express the ability to construct an object from a raw file
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descriptor.</p>
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</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.from_raw_fd" class="method"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/std/os/fd/raw.rs.html#110">source</a><h4 class="code-header">unsafe fn <a href="#tymethod.from_raw_fd" class="fn">from_raw_fd</a>(fd: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.i32.html">i32</a>) -> Self</h4></section></summary><div class="docblock"><p>Constructs a new instance of <code>Self</code> from the given raw file
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descriptor.</p>
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<p>This function is typically used to <strong>consume ownership</strong> of the
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specified file descriptor. When used in this way, the returned object
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will take responsibility for closing it when the object goes out of
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scope.</p>
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<p>However, consuming ownership is not strictly required. Use a
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<a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html#tymethod.from" title="associated function core::convert::From::from"><code>From<OwnedFd>::from</code></a> implementation for an API which strictly
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consumes ownership.</p>
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<h5 id="safety"><a href="#safety">Safety</a></h5>
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<p>The <code>fd</code> passed in must be an <a href="https://doc.rust-lang.org/1.76.0/std/io/index.html#io-safety" title="mod std::io">owned file descriptor</a>;
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in particular, it must be open.</p>
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<h5 id="example"><a href="#example">Example</a></h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::fs::File;
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<span class="attr">#[cfg(any(unix, target_os = <span class="string">"wasi"</span>))]
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</span><span class="kw">use </span>std::os::fd::{FromRawFd, IntoRawFd, RawFd};
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<span class="kw">let </span>f = File::open(<span class="string">"foo.txt"</span>)<span class="question-mark">?</span>;
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<span class="kw">let </span>raw_fd: RawFd = f.into_raw_fd();
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<span class="comment">// SAFETY: no other functions should call `from_raw_fd`, so there
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// is only one owner for the file descriptor.
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</span><span class="kw">let </span>f = <span class="kw">unsafe </span>{ File::from_raw_fd(raw_fd) };</code></pre></div>
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</div></details></div><h2 id="object-safety" class="section-header">Object Safety<a href="#object-safety" class="anchor">§</a></h2><div class="object-safety-info">This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.76.0/reference/items/traits.html#object-safety">object safe</a>.</div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-FromRawFd-for-i32" class="impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.48.0">1.48.0</span> · <a class="src" href="https://doc.rust-lang.org/1.76.0/src/std/os/fd/raw.rs.html#160">source</a></span><a href="#impl-FromRawFd-for-i32" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FromRawFd.html" title="trait rustix::fd::FromRawFd">FromRawFd</a> for <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.i32.html">i32</a></h3></section><section id="impl-FromRawFd-for-File" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/std/os/fd/raw.rs.html#175">source</a><a href="#impl-FromRawFd-for-File" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FromRawFd.html" title="trait rustix::fd::FromRawFd">FromRawFd</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/std/fs/struct.File.html" title="struct std::fs::File">File</a></h3></section><section id="impl-FromRawFd-for-TcpListener" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/std/os/fd/net.rs.html#33">source</a><a href="#impl-FromRawFd-for-TcpListener" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FromRawFd.html" title="trait rustix::fd::FromRawFd">FromRawFd</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/std/net/tcp/struct.TcpListener.html" title="struct std::net::tcp::TcpListener">TcpListener</a></h3></section><section id="impl-FromRawFd-for-TcpStream" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/std/os/fd/net.rs.html#33">source</a><a href="#impl-FromRawFd-for-TcpStream" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FromRawFd.html" title="trait rustix::fd::FromRawFd">FromRawFd</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/std/net/tcp/struct.TcpStream.html" title="struct std::net::tcp::TcpStream">TcpStream</a></h3></section><section id="impl-FromRawFd-for-UdpSocket" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/std/os/fd/net.rs.html#33">source</a><a href="#impl-FromRawFd-for-UdpSocket" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FromRawFd.html" title="trait rustix::fd::FromRawFd">FromRawFd</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/std/net/udp/struct.UdpSocket.html" title="struct std::net::udp::UdpSocket">UdpSocket</a></h3></section><section id="impl-FromRawFd-for-PidFd" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/std/os/linux/process.rs.html#80">source</a><a href="#impl-FromRawFd-for-PidFd" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FromRawFd.html" title="trait rustix::fd::FromRawFd">FromRawFd</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/std/os/linux/process/struct.PidFd.html" title="struct std::os::linux::process::PidFd">PidFd</a></h3></section><section id="impl-FromRawFd-for-UnixDatagram" class="impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.10.0">1.10.0</span> · <a class="src" href="https://doc.rust-lang.org/1.76.0/src/std/os/unix/net/datagram.rs.html#1002">source</a></span><a href="#impl-FromRawFd-for-UnixDatagram" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FromRawFd.html" title="trait rustix::fd::FromRawFd">FromRawFd</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/std/os/unix/net/datagram/struct.UnixDatagram.html" title="struct std::os::unix::net::datagram::UnixDatagram">UnixDatagram</a></h3></section><section id="impl-FromRawFd-for-UnixListener" class="impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.10.0">1.10.0</span> · <a class="src" href="https://doc.rust-lang.org/1.76.0/src/std/os/unix/net/listener.rs.html#293">source</a></span><a href="#impl-FromRawFd-for-UnixListener" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FromRawFd.html" title="trait rustix::fd::FromRawFd">FromRawFd</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/std/os/unix/net/listener/struct.UnixListener.html" title="struct std::os::unix::net::listener::UnixListener">UnixListener</a></h3></section><section id="impl-FromRawFd-for-UnixStream" class="impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.10.0">1.10.0</span> · <a class="src" href="https://doc.rust-lang.org/1.76.0/src/std/os/unix/net/stream.rs.html#730">source</a></span><a href="#impl-FromRawFd-for-UnixStream" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FromRawFd.html" title="trait rustix::fd::FromRawFd">FromRawFd</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/std/os/unix/net/stream/struct.UnixStream.html" title="struct std::os::unix::net::stream::UnixStream">UnixStream</a></h3></section><section id="impl-FromRawFd-for-Stdio" class="impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.2.0">1.2.0</span> · <a class="src" href="https://doc.rust-lang.org/1.76.0/src/std/os/unix/process.rs.html#354">source</a></span><a href="#impl-FromRawFd-for-Stdio" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FromRawFd.html" title="trait rustix::fd::FromRawFd">FromRawFd</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/std/process/struct.Stdio.html" title="struct std::process::Stdio">Stdio</a></h3></section><section id="impl-FromRawFd-for-OwnedFd" class="impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.63.0">1.63.0</span> · <a class="src" href="https://doc.rust-lang.org/1.76.0/src/std/os/fd/owned.rs.html#154">source</a></span><a href="#impl-FromRawFd-for-OwnedFd" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FromRawFd.html" title="trait rustix::fd::FromRawFd">FromRawFd</a> for <a class="struct" href="struct.OwnedFd.html" title="struct rustix::fd::OwnedFd">OwnedFd</a></h3></section></div><script src="../../trait.impl/std/os/fd/raw/trait.FromRawFd.js" data-ignore-extern-crates="std" async></script></section></div></main></body></html> |