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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="Try to write data from an implementer of the `Buf` trait to an `AsyncWrite`, advancing the buffers internal cursor."><title>poll_write_buf in tokio_util::io - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.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"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="tokio_util" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.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]--><rustdoc-topbar><h2><a href="#">poll_write_buf</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../tokio_util/index.html">tokio_<wbr>util</a><span class="version">0.7.18</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">poll_<wbr>write_<wbr>buf</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#examples" title="Examples">Examples</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="index.html">In tokio_<wbr>util::<wbr>io</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../index.html">tokio_util</a>::<wbr><a href="index.html">io</a></div><h1>Function <span class="fn">poll_<wbr>write_<wbr>buf</span>&nbsp;<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/tokio_util/util/poll_buf.rs.html#121-143">Source</a> </span></div><pre class="rust item-decl"><code>pub fn poll_write_buf&lt;T: <a class="trait" href="../../tokio/io/async_write/trait.AsyncWrite.html" title="trait tokio::io::async_write::AsyncWrite">AsyncWrite</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, B: <a class="trait" href="../../bytes/buf/buf_impl/trait.Buf.html" title="trait bytes::buf::buf_impl::Buf">Buf</a>&gt;(
io: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;mut T</a>&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
buf: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;mut B</a>,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Try to write data from an implementer of the <a href="../../bytes/buf/buf_impl/trait.Buf.html" title="trait bytes::buf::buf_impl::Buf"><code>Buf</code></a> trait to an
<a href="../../tokio/io/async_write/trait.AsyncWrite.html" title="trait tokio::io::async_write::AsyncWrite"><code>AsyncWrite</code></a>, advancing the buffers internal cursor.</p>
<p>This function will use <a href="../../tokio/io/async_write/trait.AsyncWrite.html#method.poll_write_vectored" title="method tokio::io::async_write::AsyncWrite::poll_write_vectored">vectored writes</a> when the <a href="../../tokio/io/async_write/trait.AsyncWrite.html" title="trait tokio::io::async_write::AsyncWrite"><code>AsyncWrite</code></a> supports
vectored writes.</p>
<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
<p><a href="../../tokio/fs/file/struct.File.html" title="struct tokio::fs::file::File"><code>File</code></a> implements <a href="../../tokio/io/async_write/trait.AsyncWrite.html" title="trait tokio::io::async_write::AsyncWrite"><code>AsyncWrite</code></a> and [<code>Cursor&lt;&amp;[u8]&gt;</code>] implements
<a href="../../bytes/buf/buf_impl/trait.Buf.html" title="trait bytes::buf::buf_impl::Buf"><code>Buf</code></a>:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tokio_util::io::poll_write_buf;
<span class="kw">use </span>tokio::io;
<span class="kw">use </span>tokio::fs::File;
<span class="kw">use </span>bytes::Buf;
<span class="kw">use </span>std::future::poll_fn;
<span class="kw">use </span>std::io::Cursor;
<span class="kw">use </span>std::pin::Pin;
<span class="attr">#[tokio::main]
</span><span class="kw">async fn </span>main() -&gt; io::Result&lt;()&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>file = File::create(<span class="string">"foo.txt"</span>).<span class="kw">await</span><span class="question-mark">?</span>;
<span class="kw">let </span><span class="kw-2">mut </span>buf = Cursor::new(<span class="string">b"data to write"</span>);
<span class="comment">// Loop until the entire contents of the buffer are written to
// the file.
</span><span class="kw">while </span>buf.has_remaining() {
poll_fn(|cx| poll_write_buf(Pin::new(<span class="kw-2">&amp;mut </span>file), cx, <span class="kw-2">&amp;mut </span>buf)).<span class="kw">await</span><span class="question-mark">?</span>;
}
<span class="prelude-val">Ok</span>(())
}</code></pre></div></div></details></section></div></main></body></html>