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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><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="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" 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 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" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../rustix/index.html">rustix</a><span class="version">0.38.42</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">From<wbr>RawFd</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.from_raw_fd" title="from_raw_fd">from_raw_fd</a></li></ul><h3><a href="#dyn-compatibility">Dyn Compatibility</a></h3><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In rustix::<wbr>fd</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">fd</a></span><h1>Trait <span class="trait">FromRawFd</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><span class="since" title="Stable since Rust version 1.1.0">1.1.0</span> · <a class="src" href="https://doc.rust-lang.org/1.84.1/src/std/os/fd/raw.rs.html#72">Source</a> </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/1.84.1/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"><span class="rightside"><span class="since" title="Stable since Rust version 1.1.0">1.1.0</span> · <a class="src" href="https://doc.rust-lang.org/1.84.1/src/std/os/fd/raw.rs.html#110">Source</a></span><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/1.84.1/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/1.84.1/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 class="doc-anchor" href="#safety">§</a>Safety</h5>
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<p>The <code>fd</code> passed in must be an <a href="https://doc.rust-lang.org/1.84.1/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 class="doc-anchor" href="#example">§</a>Example</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="dyn-compatibility" class="section-header">Dyn Compatibility<a href="#dyn-compatibility" class="anchor">§</a></h2><div class="dyn-compatibility-info"><p>This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.84.1/reference/items/traits.html#object-safety">dyn compatible</a>.</p><p><i>In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.</i></p></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/1.84.1/src/std/os/fd/raw.rs.html#161">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/1.84.1/std/primitive.i32.html">i32</a></h3></section><section id="impl-FromRawFd-for-File" class="impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.1.0">1.1.0</span> · <a class="src" href="https://doc.rust-lang.org/1.84.1/src/std/os/fd/raw.rs.html#176">Source</a></span><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/1.84.1/std/fs/struct.File.html" title="struct std::fs::File">File</a></h3></section><section id="impl-FromRawFd-for-TcpListener" class="impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.1.0">1.1.0</span> · <a class="src" href="https://doc.rust-lang.org/1.84.1/src/std/os/fd/net.rs.html#33">Source</a></span><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/1.84.1/std/net/tcp/struct.TcpListener.html" title="struct std::net::tcp::TcpListener">TcpListener</a></h3></section><section id="impl-FromRawFd-for-TcpStream" class="impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.1.0">1.1.0</span> · <a class="src" href="https://doc.rust-lang.org/1.84.1/src/std/os/fd/net.rs.html#33">Source</a></span><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/1.84.1/std/net/tcp/struct.TcpStream.html" title="struct std::net::tcp::TcpStream">TcpStream</a></h3></section><section id="impl-FromRawFd-for-UdpSocket" class="impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.1.0">1.1.0</span> · <a class="src" href="https://doc.rust-lang.org/1.84.1/src/std/os/fd/net.rs.html#33">Source</a></span><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/1.84.1/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/1.84.1/src/std/os/linux/process.rs.html#115">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/1.84.1/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/1.84.1/src/std/os/unix/net/datagram.rs.html#948">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/1.84.1/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/1.84.1/src/std/os/unix/net/listener.rs.html#320">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/1.84.1/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/1.84.1/src/std/os/unix/net/stream.rs.html#661">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/1.84.1/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-PipeReader" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.1/src/std/sys/anonymous_pipe/unix.rs.html#35">Source</a><a href="#impl-FromRawFd-for-PipeReader" 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/1.84.1/std/pipe/struct.PipeReader.html" title="struct std::pipe::PipeReader">PipeReader</a></h3></section><section id="impl-FromRawFd-for-PipeWriter" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.1/src/std/sys/anonymous_pipe/unix.rs.html#72">Source</a><a href="#impl-FromRawFd-for-PipeWriter" 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/1.84.1/std/pipe/struct.PipeWriter.html" title="struct std::pipe::PipeWriter">PipeWriter</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/1.84.1/src/std/os/unix/process.rs.html#364">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/1.84.1/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/1.84.1/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> |