<!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 to the Rust file `libstd/io/stdio.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>stdio.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../std/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust ">
<span class="comment">// Copyright 2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="kw">use</span> <span class="ident">io</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">cell</span>::<span class="ident">RefCell</span>;
<span class="kw">use</span> <span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">io</span>::<span class="ident">lazy</span>::<span class="ident">Lazy</span>;
<span class="kw">use</span> <span class="ident">io</span>::{<span class="self">self</span>, <span class="ident">Initializer</span>, <span class="ident">BufReader</span>, <span class="ident">LineWriter</span>};
<span class="kw">use</span> <span class="ident">sync</span>::{<span class="ident">Arc</span>, <span class="ident">Mutex</span>, <span class="ident">MutexGuard</span>};
<span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">stdio</span>;
<span class="kw">use</span> <span class="ident">sys_common</span>::<span class="ident">remutex</span>::{<span class="ident">ReentrantMutex</span>, <span class="ident">ReentrantMutexGuard</span>};
<span class="kw">use</span> <span class="ident">thread</span>::<span class="ident">LocalKey</span>;
<span class="doccomment">/// Stdout used by print! and println! macros</span>
<span class="macro">thread_local</span><span class="macro">!</span> {
<span class="kw">static</span> <span class="ident">LOCAL_STDOUT</span>: <span class="ident">RefCell</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">Write</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">>></span><span class="op">></span> <span class="op">=</span> {
<span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="prelude-val">None</span>)
}
}
<span class="doccomment">/// A handle to a raw instance of the standard input stream of this process.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This handle is not synchronized or buffered in any fashion. Constructed via</span>
<span class="doccomment">/// the `std::io::stdio::stdin_raw` function.</span>
<span class="kw">struct</span> <span class="ident">StdinRaw</span>(<span class="ident">stdio</span>::<span class="ident">Stdin</span>);
<span class="doccomment">/// A handle to a raw instance of the standard output stream of this process.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This handle is not synchronized or buffered in any fashion. Constructed via</span>
<span class="doccomment">/// the `std::io::stdio::stdout_raw` function.</span>
<span class="kw">struct</span> <span class="ident">StdoutRaw</span>(<span class="ident">stdio</span>::<span class="ident">Stdout</span>);
<span class="doccomment">/// A handle to a raw instance of the standard output stream of this process.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This handle is not synchronized or buffered in any fashion. Constructed via</span>
<span class="doccomment">/// the `std::io::stdio::stderr_raw` function.</span>
<span class="kw">struct</span> <span class="ident">StderrRaw</span>(<span class="ident">stdio</span>::<span class="ident">Stderr</span>);
<span class="doccomment">/// Constructs a new raw handle to the standard input of this process.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned handle does not interact with any other handles created nor</span>
<span class="doccomment">/// handles returned by `std::io::stdin`. Data buffered by the `std::io::stdin`</span>
<span class="doccomment">/// handles is **not** available to raw handles returned from this function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned handle has no external synchronization or buffering.</span>
<span class="kw">fn</span> <span class="ident">stdin_raw</span>() <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">StdinRaw</span><span class="op">></span> { <span class="ident">stdio</span>::<span class="ident">Stdin</span>::<span class="ident">new</span>().<span class="ident">map</span>(<span class="ident">StdinRaw</span>) }
<span class="doccomment">/// Constructs a new raw handle to the standard output stream of this process.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned handle does not interact with any other handles created nor</span>
<span class="doccomment">/// handles returned by `std::io::stdout`. Note that data is buffered by the</span>
<span class="doccomment">/// `std::io::stdout` handles so writes which happen via this raw handle may</span>
<span class="doccomment">/// appear before previous writes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned handle has no external synchronization or buffering layered on</span>
<span class="doccomment">/// top.</span>
<span class="kw">fn</span> <span class="ident">stdout_raw</span>() <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">StdoutRaw</span><span class="op">></span> { <span class="ident">stdio</span>::<span class="ident">Stdout</span>::<span class="ident">new</span>().<span class="ident">map</span>(<span class="ident">StdoutRaw</span>) }
<span class="doccomment">/// Constructs a new raw handle to the standard error stream of this process.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned handle does not interact with any other handles created nor</span>
<span class="doccomment">/// handles returned by `std::io::stderr`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned handle has no external synchronization or buffering layered on</span>
<span class="doccomment">/// top.</span>
<span class="kw">fn</span> <span class="ident">stderr_raw</span>() <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">StderrRaw</span><span class="op">></span> { <span class="ident">stdio</span>::<span class="ident">Stderr</span>::<span class="ident">new</span>().<span class="ident">map</span>(<span class="ident">StderrRaw</span>) }
<span class="kw">impl</span> <span class="ident">Read</span> <span class="kw">for</span> <span class="ident">StdinRaw</span> {
<span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">read</span>(<span class="ident">buf</span>) }
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">initializer</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Initializer</span> {
<span class="ident">Initializer</span>::<span class="ident">nop</span>()
}
}
<span class="kw">impl</span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">StdoutRaw</span> {
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">write</span>(<span class="ident">buf</span>) }
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">flush</span>() }
}
<span class="kw">impl</span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">StderrRaw</span> {
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">write</span>(<span class="ident">buf</span>) }
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">flush</span>() }
}
<span class="kw">enum</span> <span class="ident">Maybe</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Real</span>(<span class="ident">T</span>),
<span class="ident">Fake</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">io</span>::<span class="ident">Write</span><span class="op">></span> <span class="ident">io</span>::<span class="ident">Write</span> <span class="kw">for</span> <span class="ident">Maybe</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">Maybe</span>::<span class="ident">Real</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">w</span>) <span class="op">=></span> <span class="ident">handle_ebadf</span>(<span class="ident">w</span>.<span class="ident">write</span>(<span class="ident">buf</span>), <span class="ident">buf</span>.<span class="ident">len</span>()),
<span class="ident">Maybe</span>::<span class="ident">Fake</span> <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">buf</span>.<span class="ident">len</span>())
}
}
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">Maybe</span>::<span class="ident">Real</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">w</span>) <span class="op">=></span> <span class="ident">handle_ebadf</span>(<span class="ident">w</span>.<span class="ident">flush</span>(), ()),
<span class="ident">Maybe</span>::<span class="ident">Fake</span> <span class="op">=></span> <span class="prelude-val">Ok</span>(())
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">io</span>::<span class="ident">Read</span><span class="op">></span> <span class="ident">io</span>::<span class="ident">Read</span> <span class="kw">for</span> <span class="ident">Maybe</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">Maybe</span>::<span class="ident">Real</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">r</span>) <span class="op">=></span> <span class="ident">handle_ebadf</span>(<span class="ident">r</span>.<span class="ident">read</span>(<span class="ident">buf</span>), <span class="number">0</span>),
<span class="ident">Maybe</span>::<span class="ident">Fake</span> <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="number">0</span>)
}
}
}
<span class="kw">fn</span> <span class="ident">handle_ebadf</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">r</span>: <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">default</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">match</span> <span class="ident">r</span> {
<span class="prelude-val">Err</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="kw">if</span> <span class="ident">stdio</span>::<span class="ident">is_ebadf</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">default</span>),
<span class="ident">r</span> <span class="op">=></span> <span class="ident">r</span>
}
}
<span class="doccomment">/// A handle to the standard input stream of a process.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Each handle is a shared reference to a global buffer of input data to this</span>
<span class="doccomment">/// process. A handle can be `lock`'d to gain full access to [`BufRead`] methods</span>
<span class="doccomment">/// (e.g. `.lines()`). Reads to this handle are otherwise locked with respect</span>
<span class="doccomment">/// to other reads.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This handle implements the `Read` trait, but beware that concurrent reads</span>
<span class="doccomment">/// of `Stdin` must be executed with care.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Created by the [`io::stdin`] method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`io::stdin`]: fn.stdin.html</span>
<span class="doccomment">/// [`BufRead`]: trait.BufRead.html</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Stdin</span> {
<span class="ident">inner</span>: <span class="ident">Arc</span><span class="op"><</span><span class="ident">Mutex</span><span class="op"><</span><span class="ident">BufReader</span><span class="op"><</span><span class="ident">Maybe</span><span class="op"><</span><span class="ident">StdinRaw</span><span class="op">>></span><span class="op">>></span>,
}
<span class="doccomment">/// A locked reference to the `Stdin` handle.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This handle implements both the [`Read`] and [`BufRead`] traits, and</span>
<span class="doccomment">/// is constructed via the [`Stdin::lock`] method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Read`]: trait.Read.html</span>
<span class="doccomment">/// [`BufRead`]: trait.BufRead.html</span>
<span class="doccomment">/// [`Stdin::lock`]: struct.Stdin.html#method.lock</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">StdinLock</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">MutexGuard</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">BufReader</span><span class="op"><</span><span class="ident">Maybe</span><span class="op"><</span><span class="ident">StdinRaw</span><span class="op">>></span><span class="op">></span>,
}
<span class="doccomment">/// Constructs a new handle to the standard input of the current process.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Each handle returned is a reference to a shared global buffer whose access</span>
<span class="doccomment">/// is synchronized via a mutex. If you need more explicit control over</span>
<span class="doccomment">/// locking, see the [`lock() method`][lock].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [lock]: struct.Stdin.html#method.lock</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using implicit synchronization:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::{self, Read};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> io::Result<()> {</span>
<span class="doccomment">/// let mut buffer = String::new();</span>
<span class="doccomment">/// io::stdin().read_to_string(&mut buffer)?;</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using explicit synchronization:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::{self, Read};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> io::Result<()> {</span>
<span class="doccomment">/// let mut buffer = String::new();</span>
<span class="doccomment">/// let stdin = io::stdin();</span>
<span class="doccomment">/// let mut handle = stdin.lock();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// handle.read_to_string(&mut buffer)?;</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">stdin</span>() <span class="op">-></span> <span class="ident">Stdin</span> {
<span class="kw">static</span> <span class="ident">INSTANCE</span>: <span class="ident">Lazy</span><span class="op"><</span><span class="ident">Mutex</span><span class="op"><</span><span class="ident">BufReader</span><span class="op"><</span><span class="ident">Maybe</span><span class="op"><</span><span class="ident">StdinRaw</span><span class="op">>></span><span class="op">>></span> <span class="op">=</span> <span class="ident">Lazy</span>::<span class="ident">new</span>(<span class="ident">stdin_init</span>);
<span class="kw">return</span> <span class="ident">Stdin</span> {
<span class="ident">inner</span>: <span class="ident">INSTANCE</span>.<span class="ident">get</span>().<span class="ident">expect</span>(<span class="string">"cannot access stdin during shutdown"</span>),
};
<span class="kw">fn</span> <span class="ident">stdin_init</span>() <span class="op">-></span> <span class="ident">Arc</span><span class="op"><</span><span class="ident">Mutex</span><span class="op"><</span><span class="ident">BufReader</span><span class="op"><</span><span class="ident">Maybe</span><span class="op"><</span><span class="ident">StdinRaw</span><span class="op">>></span><span class="op">>></span> {
<span class="kw">let</span> <span class="ident">stdin</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">stdin_raw</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">stdin</span>) <span class="op">=></span> <span class="ident">Maybe</span>::<span class="ident">Real</span>(<span class="ident">stdin</span>),
<span class="kw">_</span> <span class="op">=></span> <span class="ident">Maybe</span>::<span class="ident">Fake</span>
};
<span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="ident">BufReader</span>::<span class="ident">with_capacity</span>(<span class="ident">stdio</span>::<span class="ident">STDIN_BUF_SIZE</span>, <span class="ident">stdin</span>)))
}
}
<span class="kw">impl</span> <span class="ident">Stdin</span> {
<span class="doccomment">/// Locks this handle to the standard input stream, returning a readable</span>
<span class="doccomment">/// guard.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The lock is released when the returned lock goes out of scope. The</span>
<span class="doccomment">/// returned guard also implements the [`Read`] and [`BufRead`] traits for</span>
<span class="doccomment">/// accessing the underlying data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Read`]: trait.Read.html</span>
<span class="doccomment">/// [`BufRead`]: trait.BufRead.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::{self, Read};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> io::Result<()> {</span>
<span class="doccomment">/// let mut buffer = String::new();</span>
<span class="doccomment">/// let stdin = io::stdin();</span>
<span class="doccomment">/// let mut handle = stdin.lock();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// handle.read_to_string(&mut buffer)?;</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">lock</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">StdinLock</span> {
<span class="ident">StdinLock</span> { <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">lock</span>().<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">into_inner</span>()) }
}
<span class="doccomment">/// Locks this handle and reads a line of input into the specified buffer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For detailed semantics of this method, see the documentation on</span>
<span class="doccomment">/// [`BufRead::read_line`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`BufRead::read_line`]: trait.BufRead.html#method.read_line</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut input = String::new();</span>
<span class="doccomment">/// match io::stdin().read_line(&mut input) {</span>
<span class="doccomment">/// Ok(n) => {</span>
<span class="doccomment">/// println!("{} bytes read", n);</span>
<span class="doccomment">/// println!("{}", input);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// Err(error) => println!("error: {}", error),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// You can run the example one of two ways:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - Pipe some text to it, e.g. `printf foo | path/to/executable`</span>
<span class="doccomment">/// - Give it text interactively by running the executable directly,</span>
<span class="doccomment">/// in which case it will wait for the Enter key to be pressed before</span>
<span class="doccomment">/// continuing</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">read_line</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">String</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">lock</span>().<span class="ident">read_line</span>(<span class="ident">buf</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Stdin</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">pad</span>(<span class="string">"Stdin { .. }"</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Read</span> <span class="kw">for</span> <span class="ident">Stdin</span> {
<span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">lock</span>().<span class="ident">read</span>(<span class="ident">buf</span>)
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">initializer</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Initializer</span> {
<span class="ident">Initializer</span>::<span class="ident">nop</span>()
}
<span class="kw">fn</span> <span class="ident">read_to_end</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">lock</span>().<span class="ident">read_to_end</span>(<span class="ident">buf</span>)
}
<span class="kw">fn</span> <span class="ident">read_to_string</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">String</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">lock</span>().<span class="ident">read_to_string</span>(<span class="ident">buf</span>)
}
<span class="kw">fn</span> <span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="self">self</span>.<span class="ident">lock</span>().<span class="ident">read_exact</span>(<span class="ident">buf</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Read</span> <span class="kw">for</span> <span class="ident">StdinLock</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">read</span>(<span class="ident">buf</span>)
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">initializer</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Initializer</span> {
<span class="ident">Initializer</span>::<span class="ident">nop</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">BufRead</span> <span class="kw">for</span> <span class="ident">StdinLock</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fill_buf</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">u8</span>]<span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">fill_buf</span>() }
<span class="kw">fn</span> <span class="ident">consume</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">consume</span>(<span class="ident">n</span>) }
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">StdinLock</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">pad</span>(<span class="string">"StdinLock { .. }"</span>)
}
}
<span class="doccomment">/// A handle to the global standard output stream of the current process.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Each handle shares a global buffer of data to be written to the standard</span>
<span class="doccomment">/// output stream. Access is also synchronized via a lock and explicit control</span>
<span class="doccomment">/// over locking is available via the [`lock`] method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Created by the [`io::stdout`] method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`lock`]: #method.lock</span>
<span class="doccomment">/// [`io::stdout`]: fn.stdout.html</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Stdout</span> {
<span class="comment">// FIXME: this should be LineWriter or BufWriter depending on the state of</span>
<span class="comment">// stdout (tty or not). Note that if this is not line buffered it</span>
<span class="comment">// should also flush-on-panic or some form of flush-on-abort.</span>
<span class="ident">inner</span>: <span class="ident">Arc</span><span class="op"><</span><span class="ident">ReentrantMutex</span><span class="op"><</span><span class="ident">RefCell</span><span class="op"><</span><span class="ident">LineWriter</span><span class="op"><</span><span class="ident">Maybe</span><span class="op"><</span><span class="ident">StdoutRaw</span><span class="op">>></span><span class="op">>></span><span class="op">></span>,
}
<span class="doccomment">/// A locked reference to the `Stdout` handle.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This handle implements the [`Write`] trait, and is constructed via</span>
<span class="doccomment">/// the [`Stdout::lock`] method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Write`]: trait.Write.html</span>
<span class="doccomment">/// [`Stdout::lock`]: struct.Stdout.html#method.lock</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">StdoutLock</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">ReentrantMutexGuard</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">RefCell</span><span class="op"><</span><span class="ident">LineWriter</span><span class="op"><</span><span class="ident">Maybe</span><span class="op"><</span><span class="ident">StdoutRaw</span><span class="op">>></span><span class="op">>></span>,
}
<span class="doccomment">/// Constructs a new handle to the standard output of the current process.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Each handle returned is a reference to a shared global buffer whose access</span>
<span class="doccomment">/// is synchronized via a mutex. If you need more explicit control over</span>
<span class="doccomment">/// locking, see the [Stdout::lock] method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [Stdout::lock]: struct.Stdout.html#method.lock</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using implicit synchronization:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::{self, Write};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> io::Result<()> {</span>
<span class="doccomment">/// io::stdout().write(b"hello world")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using explicit synchronization:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::{self, Write};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> io::Result<()> {</span>
<span class="doccomment">/// let stdout = io::stdout();</span>
<span class="doccomment">/// let mut handle = stdout.lock();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// handle.write(b"hello world")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">stdout</span>() <span class="op">-></span> <span class="ident">Stdout</span> {
<span class="kw">static</span> <span class="ident">INSTANCE</span>: <span class="ident">Lazy</span><span class="op"><</span><span class="ident">ReentrantMutex</span><span class="op"><</span><span class="ident">RefCell</span><span class="op"><</span><span class="ident">LineWriter</span><span class="op"><</span><span class="ident">Maybe</span><span class="op"><</span><span class="ident">StdoutRaw</span><span class="op">>></span><span class="op">>></span><span class="op">></span>
<span class="op">=</span> <span class="ident">Lazy</span>::<span class="ident">new</span>(<span class="ident">stdout_init</span>);
<span class="kw">return</span> <span class="ident">Stdout</span> {
<span class="ident">inner</span>: <span class="ident">INSTANCE</span>.<span class="ident">get</span>().<span class="ident">expect</span>(<span class="string">"cannot access stdout during shutdown"</span>),
};
<span class="kw">fn</span> <span class="ident">stdout_init</span>() <span class="op">-></span> <span class="ident">Arc</span><span class="op"><</span><span class="ident">ReentrantMutex</span><span class="op"><</span><span class="ident">RefCell</span><span class="op"><</span><span class="ident">LineWriter</span><span class="op"><</span><span class="ident">Maybe</span><span class="op"><</span><span class="ident">StdoutRaw</span><span class="op">>></span><span class="op">>></span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">stdout</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">stdout_raw</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">stdout</span>) <span class="op">=></span> <span class="ident">Maybe</span>::<span class="ident">Real</span>(<span class="ident">stdout</span>),
<span class="kw">_</span> <span class="op">=></span> <span class="ident">Maybe</span>::<span class="ident">Fake</span>,
};
<span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">ReentrantMutex</span>::<span class="ident">new</span>(<span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="ident">LineWriter</span>::<span class="ident">new</span>(<span class="ident">stdout</span>))))
}
}
<span class="kw">impl</span> <span class="ident">Stdout</span> {
<span class="doccomment">/// Locks this handle to the standard output stream, returning a writable</span>
<span class="doccomment">/// guard.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The lock is released when the returned lock goes out of scope. The</span>
<span class="doccomment">/// returned guard also implements the `Write` trait for writing data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::{self, Write};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> io::Result<()> {</span>
<span class="doccomment">/// let stdout = io::stdout();</span>
<span class="doccomment">/// let mut handle = stdout.lock();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// handle.write(b"hello world")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">lock</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">StdoutLock</span> {
<span class="ident">StdoutLock</span> { <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">lock</span>().<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">into_inner</span>()) }
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Stdout</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">pad</span>(<span class="string">"Stdout { .. }"</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">Stdout</span> {
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">lock</span>().<span class="ident">write</span>(<span class="ident">buf</span>)
}
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="self">self</span>.<span class="ident">lock</span>().<span class="ident">flush</span>()
}
<span class="kw">fn</span> <span class="ident">write_all</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="self">self</span>.<span class="ident">lock</span>().<span class="ident">write_all</span>(<span class="ident">buf</span>)
}
<span class="kw">fn</span> <span class="ident">write_fmt</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">args</span>: <span class="ident">fmt</span>::<span class="ident">Arguments</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="self">self</span>.<span class="ident">lock</span>().<span class="ident">write_fmt</span>(<span class="ident">args</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">StdoutLock</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">borrow_mut</span>().<span class="ident">write</span>(<span class="ident">buf</span>)
}
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">borrow_mut</span>().<span class="ident">flush</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">StdoutLock</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">pad</span>(<span class="string">"StdoutLock { .. }"</span>)
}
}
<span class="doccomment">/// A handle to the standard error stream of a process.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For more information, see the [`io::stderr`] method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`io::stderr`]: fn.stderr.html</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Stderr</span> {
<span class="ident">inner</span>: <span class="ident">Arc</span><span class="op"><</span><span class="ident">ReentrantMutex</span><span class="op"><</span><span class="ident">RefCell</span><span class="op"><</span><span class="ident">Maybe</span><span class="op"><</span><span class="ident">StderrRaw</span><span class="op">>></span><span class="op">>></span>,
}
<span class="doccomment">/// A locked reference to the `Stderr` handle.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This handle implements the `Write` trait and is constructed via</span>
<span class="doccomment">/// the [`Stderr::lock`] method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Stderr::lock`]: struct.Stderr.html#method.lock</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">StderrLock</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">ReentrantMutexGuard</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">RefCell</span><span class="op"><</span><span class="ident">Maybe</span><span class="op"><</span><span class="ident">StderrRaw</span><span class="op">>></span><span class="op">></span>,
}
<span class="doccomment">/// Constructs a new handle to the standard error of the current process.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This handle is not buffered.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using implicit synchronization:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::{self, Write};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> io::Result<()> {</span>
<span class="doccomment">/// io::stderr().write(b"hello world")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using explicit synchronization:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::{self, Write};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> io::Result<()> {</span>
<span class="doccomment">/// let stderr = io::stderr();</span>
<span class="doccomment">/// let mut handle = stderr.lock();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// handle.write(b"hello world")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">stderr</span>() <span class="op">-></span> <span class="ident">Stderr</span> {
<span class="kw">static</span> <span class="ident">INSTANCE</span>: <span class="ident">Lazy</span><span class="op"><</span><span class="ident">ReentrantMutex</span><span class="op"><</span><span class="ident">RefCell</span><span class="op"><</span><span class="ident">Maybe</span><span class="op"><</span><span class="ident">StderrRaw</span><span class="op">>></span><span class="op">>></span> <span class="op">=</span> <span class="ident">Lazy</span>::<span class="ident">new</span>(<span class="ident">stderr_init</span>);
<span class="kw">return</span> <span class="ident">Stderr</span> {
<span class="ident">inner</span>: <span class="ident">INSTANCE</span>.<span class="ident">get</span>().<span class="ident">expect</span>(<span class="string">"cannot access stderr during shutdown"</span>),
};
<span class="kw">fn</span> <span class="ident">stderr_init</span>() <span class="op">-></span> <span class="ident">Arc</span><span class="op"><</span><span class="ident">ReentrantMutex</span><span class="op"><</span><span class="ident">RefCell</span><span class="op"><</span><span class="ident">Maybe</span><span class="op"><</span><span class="ident">StderrRaw</span><span class="op">>></span><span class="op">>></span> {
<span class="kw">let</span> <span class="ident">stderr</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">stderr_raw</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">stderr</span>) <span class="op">=></span> <span class="ident">Maybe</span>::<span class="ident">Real</span>(<span class="ident">stderr</span>),
<span class="kw">_</span> <span class="op">=></span> <span class="ident">Maybe</span>::<span class="ident">Fake</span>,
};
<span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">ReentrantMutex</span>::<span class="ident">new</span>(<span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="ident">stderr</span>)))
}
}
<span class="kw">impl</span> <span class="ident">Stderr</span> {
<span class="doccomment">/// Locks this handle to the standard error stream, returning a writable</span>
<span class="doccomment">/// guard.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The lock is released when the returned lock goes out of scope. The</span>
<span class="doccomment">/// returned guard also implements the `Write` trait for writing data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::{self, Write};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let stderr = io::stderr();</span>
<span class="doccomment">/// let mut handle = stderr.lock();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// handle.write(b"hello world")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">lock</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">StderrLock</span> {
<span class="ident">StderrLock</span> { <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">lock</span>().<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">into_inner</span>()) }
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Stderr</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">pad</span>(<span class="string">"Stderr { .. }"</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">Stderr</span> {
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">lock</span>().<span class="ident">write</span>(<span class="ident">buf</span>)
}
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="self">self</span>.<span class="ident">lock</span>().<span class="ident">flush</span>()
}
<span class="kw">fn</span> <span class="ident">write_all</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="self">self</span>.<span class="ident">lock</span>().<span class="ident">write_all</span>(<span class="ident">buf</span>)
}
<span class="kw">fn</span> <span class="ident">write_fmt</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">args</span>: <span class="ident">fmt</span>::<span class="ident">Arguments</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="self">self</span>.<span class="ident">lock</span>().<span class="ident">write_fmt</span>(<span class="ident">args</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">StderrLock</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">borrow_mut</span>().<span class="ident">write</span>(<span class="ident">buf</span>)
}
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">borrow_mut</span>().<span class="ident">flush</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">StderrLock</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">pad</span>(<span class="string">"StderrLock { .. }"</span>)
}
}
<span class="doccomment">/// Resets the thread-local stderr handle to the specified writer</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This will replace the current thread's stderr handle, returning the old</span>
<span class="doccomment">/// handle. All future calls to `panic!` and friends will emit their output to</span>
<span class="doccomment">/// this specified handle.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that this does not need to be called for all new threads; the default</span>
<span class="doccomment">/// output handle is to the process's stderr stream.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"set_stdio"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"this function may disappear completely or be replaced \
with a more general mechanism"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_panic</span>(<span class="ident">sink</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">Write</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">>></span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">Write</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">>></span> {
<span class="kw">use</span> <span class="ident">panicking</span>::<span class="ident">LOCAL_STDERR</span>;
<span class="kw">use</span> <span class="ident">mem</span>;
<span class="ident">LOCAL_STDERR</span>.<span class="ident">with</span>(<span class="kw">move</span> <span class="op">|</span><span class="ident">slot</span><span class="op">|</span> {
<span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">slot</span>.<span class="ident">borrow_mut</span>(), <span class="ident">sink</span>)
}).<span class="ident">and_then</span>(<span class="op">|</span><span class="kw-2">mut</span> <span class="ident">s</span><span class="op">|</span> {
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">flush</span>();
<span class="prelude-val">Some</span>(<span class="ident">s</span>)
})
}
<span class="doccomment">/// Resets the thread-local stdout handle to the specified writer</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This will replace the current thread's stdout handle, returning the old</span>
<span class="doccomment">/// handle. All future calls to `print!` and friends will emit their output to</span>
<span class="doccomment">/// this specified handle.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that this does not need to be called for all new threads; the default</span>
<span class="doccomment">/// output handle is to the process's stdout stream.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"set_stdio"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"this function may disappear completely or be replaced \
with a more general mechanism"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_print</span>(<span class="ident">sink</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">Write</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">>></span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">Write</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">>></span> {
<span class="kw">use</span> <span class="ident">mem</span>;
<span class="ident">LOCAL_STDOUT</span>.<span class="ident">with</span>(<span class="kw">move</span> <span class="op">|</span><span class="ident">slot</span><span class="op">|</span> {
<span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">slot</span>.<span class="ident">borrow_mut</span>(), <span class="ident">sink</span>)
}).<span class="ident">and_then</span>(<span class="op">|</span><span class="kw-2">mut</span> <span class="ident">s</span><span class="op">|</span> {
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">flush</span>();
<span class="prelude-val">Some</span>(<span class="ident">s</span>)
})
}
<span class="doccomment">/// Write `args` to output stream `local_s` if possible, `global_s`</span>
<span class="doccomment">/// otherwise. `label` identifies the stream in a panic message.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function is used to print error messages, so it takes extra</span>
<span class="doccomment">/// care to avoid causing a panic when `local_stream` is unusable.</span>
<span class="doccomment">/// For instance, if the TLS key for the local stream is</span>
<span class="doccomment">/// already destroyed, or if the local stream is locked by another</span>
<span class="doccomment">/// thread, it will just fall back to the global stream.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// However, if the actual I/O causes an error, this function does panic.</span>
<span class="kw">fn</span> <span class="ident">print_to</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(
<span class="ident">args</span>: <span class="ident">fmt</span>::<span class="ident">Arguments</span>,
<span class="ident">local_s</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">LocalKey</span><span class="op"><</span><span class="ident">RefCell</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">Write</span><span class="op">+</span><span class="ident">Send</span><span class="op">>></span><span class="op">>></span>,
<span class="ident">global_s</span>: <span class="kw">fn</span>() <span class="op">-></span> <span class="ident">T</span>,
<span class="ident">label</span>: <span class="kw-2">&</span><span class="ident">str</span>,
)
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">Write</span>,
{
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">local_s</span>.<span class="ident">try_with</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="kw-2">mut</span> <span class="ident">borrowed</span>) <span class="op">=</span> <span class="ident">s</span>.<span class="ident">try_borrow_mut</span>() {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">w</span>) <span class="op">=</span> <span class="ident">borrowed</span>.<span class="ident">as_mut</span>() {
<span class="kw">return</span> <span class="ident">w</span>.<span class="ident">write_fmt</span>(<span class="ident">args</span>);
}
}
<span class="ident">global_s</span>().<span class="ident">write_fmt</span>(<span class="ident">args</span>)
}).<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> {
<span class="ident">global_s</span>().<span class="ident">write_fmt</span>(<span class="ident">args</span>)
});
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=</span> <span class="ident">result</span> {
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"failed printing to {}: {}"</span>, <span class="ident">label</span>, <span class="ident">e</span>);
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"print_internals"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"implementation detail which may disappear or be replaced at any time"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">_print</span>(<span class="ident">args</span>: <span class="ident">fmt</span>::<span class="ident">Arguments</span>) {
<span class="ident">print_to</span>(<span class="ident">args</span>, <span class="kw-2">&</span><span class="ident">LOCAL_STDOUT</span>, <span class="ident">stdout</span>, <span class="string">"stdout"</span>);
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"print_internals"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"implementation detail which may disappear or be replaced at any time"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">_eprint</span>(<span class="ident">args</span>: <span class="ident">fmt</span>::<span class="ident">Arguments</span>) {
<span class="kw">use</span> <span class="ident">panicking</span>::<span class="ident">LOCAL_STDERR</span>;
<span class="ident">print_to</span>(<span class="ident">args</span>, <span class="kw-2">&</span><span class="ident">LOCAL_STDERR</span>, <span class="ident">stderr</span>, <span class="string">"stderr"</span>);
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="ident">thread</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>, <span class="ident">ignore</span>)]</span>
<span class="kw">fn</span> <span class="ident">panic_doesnt_poison</span>() {
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="op">||</span> {
<span class="kw">let</span> <span class="ident">_a</span> <span class="op">=</span> <span class="ident">stdin</span>();
<span class="kw">let</span> <span class="ident">_a</span> <span class="op">=</span> <span class="ident">_a</span>.<span class="ident">lock</span>();
<span class="kw">let</span> <span class="ident">_a</span> <span class="op">=</span> <span class="ident">stdout</span>();
<span class="kw">let</span> <span class="ident">_a</span> <span class="op">=</span> <span class="ident">_a</span>.<span class="ident">lock</span>();
<span class="kw">let</span> <span class="ident">_a</span> <span class="op">=</span> <span class="ident">stderr</span>();
<span class="kw">let</span> <span class="ident">_a</span> <span class="op">=</span> <span class="ident">_a</span>.<span class="ident">lock</span>();
<span class="macro">panic</span><span class="macro">!</span>();
}).<span class="ident">join</span>().<span class="ident">unwrap_err</span>();
<span class="kw">let</span> <span class="ident">_a</span> <span class="op">=</span> <span class="ident">stdin</span>();
<span class="kw">let</span> <span class="ident">_a</span> <span class="op">=</span> <span class="ident">_a</span>.<span class="ident">lock</span>();
<span class="kw">let</span> <span class="ident">_a</span> <span class="op">=</span> <span class="ident">stdout</span>();
<span class="kw">let</span> <span class="ident">_a</span> <span class="op">=</span> <span class="ident">_a</span>.<span class="ident">lock</span>();
<span class="kw">let</span> <span class="ident">_a</span> <span class="op">=</span> <span class="ident">stderr</span>();
<span class="kw">let</span> <span class="ident">_a</span> <span class="op">=</span> <span class="ident">_a</span>.<span class="ident">lock</span>();
}
}
</pre>
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