| <!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="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.28.2/src/fs/read.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>read.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../tokio/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../tokio/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::fs::asyncify; |
| |
| <span class="kw">use </span>std::{io, path::Path}; |
| |
| <span class="doccomment">/// Reads the entire contents of a file into a bytes vector. |
| /// |
| /// This is an async version of [`std::fs::read`][std] |
| /// |
| /// [std]: std::fs::read |
| /// |
| /// This is a convenience function for using [`File::open`] and [`read_to_end`] |
| /// with fewer imports and without an intermediate variable. It pre-allocates a |
| /// buffer based on the file size when available, so it is generally faster than |
| /// reading into a vector created with `Vec::new()`. |
| /// |
| /// This operation is implemented by running the equivalent blocking operation |
| /// on a separate thread pool using [`spawn_blocking`]. |
| /// |
| /// [`File::open`]: super::File::open |
| /// [`read_to_end`]: crate::io::AsyncReadExt::read_to_end |
| /// [`spawn_blocking`]: crate::task::spawn_blocking |
| /// |
| /// # Errors |
| /// |
| /// This function will return an error if `path` does not already exist. |
| /// Other errors may also be returned according to [`OpenOptions::open`]. |
| /// |
| /// [`OpenOptions::open`]: super::OpenOptions::open |
| /// |
| /// It will also return an error if it encounters while reading an error |
| /// of a kind other than [`ErrorKind::Interrupted`]. |
| /// |
| /// [`ErrorKind::Interrupted`]: std::io::ErrorKind::Interrupted |
| /// |
| /// # Examples |
| /// |
| /// ```no_run |
| /// use tokio::fs; |
| /// use std::net::SocketAddr; |
| /// |
| /// #[tokio::main] |
| /// async fn main() -> Result<(), Box<dyn std::error::Error + 'static>> { |
| /// let contents = fs::read("address.txt").await?; |
| /// let foo: SocketAddr = String::from_utf8_lossy(&contents).parse()?; |
| /// Ok(()) |
| /// } |
| /// ``` |
| </span><span class="kw">pub async fn </span>read(path: <span class="kw">impl </span>AsRef<Path>) -> io::Result<Vec<u8>> { |
| <span class="kw">let </span>path = path.as_ref().to_owned(); |
| asyncify(<span class="kw">move </span>|| std::fs::read(path)).<span class="kw">await |
| </span>} |
| </code></pre></div> |
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