<!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 `src/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"> <link rel="stylesheet" type="text/css" href="../../../main.css"> <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"> <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> <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"> </div> </form> </nav> <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> <span id="2"> 2</span> <span id="3"> 3</span> <span id="4"> 4</span> <span id="5"> 5</span> <span id="6"> 6</span> <span id="7"> 7</span> <span id="8"> 8</span> <span id="9"> 9</span> <span id="10"> 10</span> <span id="11"> 11</span> <span id="12"> 12</span> <span id="13"> 13</span> <span id="14"> 14</span> <span id="15"> 15</span> <span id="16"> 16</span> <span id="17"> 17</span> <span id="18"> 18</span> <span id="19"> 19</span> <span id="20"> 20</span> <span id="21"> 21</span> <span id="22"> 22</span> <span id="23"> 23</span> <span id="24"> 24</span> <span id="25"> 25</span> <span id="26"> 26</span> <span id="27"> 27</span> <span id="28"> 28</span> <span id="29"> 29</span> <span 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id="679">679</span> <span id="680">680</span> <span id="681">681</span> <span id="682">682</span> <span id="683">683</span> <span id="684">684</span> <span id="685">685</span> <span id="686">686</span> <span id="687">687</span> <span id="688">688</span> <span id="689">689</span> <span id="690">690</span> <span id="691">691</span> <span id="692">692</span> <span id="693">693</span> <span id="694">694</span> <span id="695">695</span> <span id="696">696</span> <span id="697">697</span> <span id="698">698</span> <span id="699">699</span> <span id="700">700</span> <span id="701">701</span> <span id="702">702</span> <span id="703">703</span> <span id="704">704</span> <span id="705">705</span> <span id="706">706</span> <span id="707">707</span> <span id="708">708</span> <span id="709">709</span> <span id="710">710</span> <span id="711">711</span> <span id="712">712</span> <span id="713">713</span> <span id="714">714</span> <span id="715">715</span> <span id="716">716</span> <span id="717">717</span> <span id="718">718</span> <span id="719">719</span> <span id="720">720</span> <span id="721">721</span> <span id="722">722</span> <span id="723">723</span> <span id="724">724</span> <span id="725">725</span> <span id="726">726</span> <span id="727">727</span> <span id="728">728</span> <span id="729">729</span> <span id="730">730</span> <span id="731">731</span> <span id="732">732</span> <span id="733">733</span> <span id="734">734</span> <span id="735">735</span> <span id="736">736</span> <span id="737">737</span> </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">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="ident">LocalKeyState</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="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="number">0</span>.<span class="ident">read_to_end</span>(<span class="ident">buf</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">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="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_to_end</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">use</span> <span class="ident">sys</span>::<span class="ident">stdio</span>::<span class="ident">EBADF_ERR</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">e</span>.<span class="ident">raw_os_error</span>() <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">EBADF_ERR</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">/// ```</span> <span class="doccomment">/// use std::io::{self, Read};</span> <span class="doccomment">///</span> <span class="doccomment">/// # fn foo() -> io::Result<String> {</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(buffer)</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">/// ```</span> <span class="doccomment">/// use std::io::{self, Read};</span> <span class="doccomment">///</span> <span class="doccomment">/// # fn foo() -> io::Result<String> {</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(buffer)</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="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">/// ```</span> <span class="doccomment">/// use std::io::{self, Read};</span> <span class="doccomment">///</span> <span class="doccomment">/// # fn foo() -> io::Result<String> {</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(buffer)</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="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="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">inner</span>.<span class="ident">read_to_end</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">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">/// ```</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">/// 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">/// ```</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 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="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">/// ```</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 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">/// ```</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">/// 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">/// ```</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">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="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="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="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 uninitialized</span> <span class="doccomment">/// or 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="kw">match</span> <span class="ident">local_s</span>.<span class="ident">state</span>() { <span class="ident">LocalKeyState</span>::<span class="ident">Uninitialized</span> <span class="op">|</span> <span class="ident">LocalKeyState</span>::<span class="ident">Destroyed</span> <span class="op">=></span> <span class="ident">global_s</span>().<span class="ident">write_fmt</span>(<span class="ident">args</span>), <span class="ident">LocalKeyState</span>::<span class="ident">Valid</span> <span class="op">=></span> { <span class="ident">local_s</span>.<span class="ident">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="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> </section> <section id='search' class="content hidden"></section> <section class="footer"></section> <aside id="help" class="hidden"> <div> <h1 class="hidden">Help</h1> <div class="shortcuts"> <h2>Keyboard Shortcuts</h2> <dl> <dt>?</dt> <dd>Show this help dialog</dd> <dt>S</dt> <dd>Focus the search field</dd> <dt>⇤</dt> <dd>Move up in search results</dd> <dt>⇥</dt> <dd>Move down in search results</dd> <dt>⏎</dt> <dd>Go to active search result</dd> <dt>+</dt> <dd>Collapse/expand all sections</dd> </dl> </div> <div class="infos"> <h2>Search Tricks</h2> <p> Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type. </p> <p> Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>. </p> <p> Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>) </p> </div> </div> </aside> <script> window.rootPath = "../../../"; 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