<!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/sys/unix/ext/process.rs`."> <meta name="keywords" content="rust, rustlang, rust-lang"> <title>process.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="../../../../../main.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"> </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> 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id="167">167</span> <span id="168">168</span> <span id="169">169</span> <span id="170">170</span> <span id="171">171</span> <span id="172">172</span> <span id="173">173</span> <span id="174">174</span> <span id="175">175</span> <span id="176">176</span> <span id="177">177</span> <span id="178">178</span> <span id="179">179</span> <span id="180">180</span> <span id="181">181</span> <span id="182">182</span> <span id="183">183</span> <span id="184">184</span> <span id="185">185</span> <span id="186">186</span> <span id="187">187</span> <span id="188">188</span> <span id="189">189</span> <span id="190">190</span> <span id="191">191</span> <span id="192">192</span> <span id="193">193</span> <span id="194">194</span> <span id="195">195</span> <span id="196">196</span> <span id="197">197</span> <span id="198">198</span> <span id="199">199</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="doccomment">//! Unix-specific extensions to primitives in the `std::process` module.</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">use</span> <span class="ident">io</span>; <span class="kw">use</span> <span class="ident">os</span>::<span class="ident">unix</span>::<span class="ident">io</span>::{<span class="ident">FromRawFd</span>, <span class="ident">RawFd</span>, <span class="ident">AsRawFd</span>, <span class="ident">IntoRawFd</span>}; <span class="kw">use</span> <span class="ident">process</span>; <span class="kw">use</span> <span class="ident">sys</span>; <span class="kw">use</span> <span class="ident">sys_common</span>::{<span class="ident">AsInnerMut</span>, <span class="ident">AsInner</span>, <span class="ident">FromInner</span>, <span class="ident">IntoInner</span>}; <span class="doccomment">/// Unix-specific extensions to the `std::process::Command` builder</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">trait</span> <span class="ident">CommandExt</span> { <span class="doccomment">/// Sets the child process's user id. This translates to a</span> <span class="doccomment">/// `setuid` call in the child process. Failure in the `setuid`</span> <span class="doccomment">/// call will cause the spawn to fail.</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">fn</span> <span class="ident">uid</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">id</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">process</span>::<span class="ident">Command</span>; <span class="doccomment">/// Similar to `uid`, but sets the group id of the child process. This has</span> <span class="doccomment">/// the same semantics as the `uid` field.</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">fn</span> <span class="ident">gid</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">id</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">process</span>::<span class="ident">Command</span>; <span class="doccomment">/// Schedules a closure to be run just before the `exec` function is</span> <span class="doccomment">/// invoked.</span> <span class="doccomment">///</span> <span class="doccomment">/// The closure is allowed to return an I/O error whose OS error code will</span> <span class="doccomment">/// be communicated back to the parent and returned as an error from when</span> <span class="doccomment">/// the spawn was requested.</span> <span class="doccomment">///</span> <span class="doccomment">/// Multiple closures can be registered and they will be called in order of</span> <span class="doccomment">/// their registration. If a closure returns `Err` then no further closures</span> <span class="doccomment">/// will be called and the spawn operation will immediately return with a</span> <span class="doccomment">/// failure.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Notes</span> <span class="doccomment">///</span> <span class="doccomment">/// This closure will be run in the context of the child process after a</span> <span class="doccomment">/// `fork`. This primarily means that any modifications made to memory on</span> <span class="doccomment">/// behalf of this closure will **not** be visible to the parent process.</span> <span class="doccomment">/// This is often a very constrained environment where normal operations</span> <span class="doccomment">/// like `malloc` or acquiring a mutex are not guaranteed to work (due to</span> <span class="doccomment">/// other threads perhaps still running when the `fork` was run).</span> <span class="doccomment">///</span> <span class="doccomment">/// When this closure is run, aspects such as the stdio file descriptors and</span> <span class="doccomment">/// working directory have successfully been changed, so output to these</span> <span class="doccomment">/// locations may not appear where intended.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"process_exec"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">before_exec</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">process</span>::<span class="ident">Command</span> <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</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="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="lifetime">'static</span>; <span class="doccomment">/// Performs all the required setup by this `Command`, followed by calling</span> <span class="doccomment">/// the `execvp` syscall.</span> <span class="doccomment">///</span> <span class="doccomment">/// On success this function will not return, and otherwise it will return</span> <span class="doccomment">/// an error indicating why the exec (or another part of the setup of the</span> <span class="doccomment">/// `Command`) failed.</span> <span class="doccomment">///</span> <span class="doccomment">/// `exec` not returning has the same implications as calling</span> <span class="doccomment">/// [`process::exit`] – no destructors on the current stack or any other</span> <span class="doccomment">/// thread’s stack will be run. Therefore, it is recommended to only call</span> <span class="doccomment">/// `exec` at a point where it is fine to not run any destructors. Note,</span> <span class="doccomment">/// that the `execvp` syscall independently guarantees that all memory is</span> <span class="doccomment">/// freed and all file descriptors with the `CLOEXEC` option (set by default</span> <span class="doccomment">/// on all file descriptors opened by the standard library) are closed.</span> <span class="doccomment">///</span> <span class="doccomment">/// This function, unlike `spawn`, will **not** `fork` the process to create</span> <span class="doccomment">/// a new child. Like spawn, however, the default behavior for the stdio</span> <span class="doccomment">/// descriptors will be to inherited from the current process.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`process::exit`]: ../../../process/fn.exit.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Notes</span> <span class="doccomment">///</span> <span class="doccomment">/// The process may be in a "broken state" if this function returns in</span> <span class="doccomment">/// error. For example the working directory, environment variables, signal</span> <span class="doccomment">/// handling settings, various user/group information, or aspects of stdio</span> <span class="doccomment">/// file descriptors may have changed. If a "transactional spawn" is</span> <span class="doccomment">/// required to gracefully handle errors it is recommended to use the</span> <span class="doccomment">/// cross-platform `spawn` instead.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"process_exec2"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">exec</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="ident">Error</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">CommandExt</span> <span class="kw">for</span> <span class="ident">process</span>::<span class="ident">Command</span> { <span class="kw">fn</span> <span class="ident">uid</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">id</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">process</span>::<span class="ident">Command</span> { <span class="self">self</span>.<span class="ident">as_inner_mut</span>().<span class="ident">uid</span>(<span class="ident">id</span>); <span class="self">self</span> } <span class="kw">fn</span> <span class="ident">gid</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">id</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">process</span>::<span class="ident">Command</span> { <span class="self">self</span>.<span class="ident">as_inner_mut</span>().<span class="ident">gid</span>(<span class="ident">id</span>); <span class="self">self</span> } <span class="kw">fn</span> <span class="ident">before_exec</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">process</span>::<span class="ident">Command</span> <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</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="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="lifetime">'static</span> { <span class="self">self</span>.<span class="ident">as_inner_mut</span>().<span class="ident">before_exec</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">f</span>)); <span class="self">self</span> } <span class="kw">fn</span> <span class="ident">exec</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="ident">Error</span> { <span class="self">self</span>.<span class="ident">as_inner_mut</span>().<span class="ident">exec</span>(<span class="ident">sys</span>::<span class="ident">process</span>::<span class="ident">Stdio</span>::<span class="ident">Inherit</span>) } } <span class="doccomment">/// Unix-specific extensions to `std::process::ExitStatus`</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">trait</span> <span class="ident">ExitStatusExt</span> { <span class="doccomment">/// Creates a new `ExitStatus` from the raw underlying `i32` return value of</span> <span class="doccomment">/// a process.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"exit_status_from"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">from_raw</span>(<span class="ident">raw</span>: <span class="ident">i32</span>) <span class="op">-></span> <span class="self">Self</span>; <span class="doccomment">/// If the process was terminated by a signal, returns that signal.</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">fn</span> <span class="ident">signal</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">i32</span><span class="op">></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">ExitStatusExt</span> <span class="kw">for</span> <span class="ident">process</span>::<span class="ident">ExitStatus</span> { <span class="kw">fn</span> <span class="ident">from_raw</span>(<span class="ident">raw</span>: <span class="ident">i32</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="ident">process</span>::<span class="ident">ExitStatus</span>::<span class="ident">from_inner</span>(<span class="ident">From</span>::<span class="ident">from</span>(<span class="ident">raw</span>)) } <span class="kw">fn</span> <span class="ident">signal</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">as_inner</span>().<span class="ident">signal</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"process_extensions"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">FromRawFd</span> <span class="kw">for</span> <span class="ident">process</span>::<span class="ident">Stdio</span> { <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_raw_fd</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>) <span class="op">-></span> <span class="ident">process</span>::<span class="ident">Stdio</span> { <span class="kw">let</span> <span class="ident">fd</span> <span class="op">=</span> <span class="ident">sys</span>::<span class="ident">fd</span>::<span class="ident">FileDesc</span>::<span class="ident">new</span>(<span class="ident">fd</span>); <span class="kw">let</span> <span class="ident">io</span> <span class="op">=</span> <span class="ident">sys</span>::<span class="ident">process</span>::<span class="ident">Stdio</span>::<span class="ident">Fd</span>(<span class="ident">fd</span>); <span class="ident">process</span>::<span class="ident">Stdio</span>::<span class="ident">from_inner</span>(<span class="ident">io</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"process_extensions"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">AsRawFd</span> <span class="kw">for</span> <span class="ident">process</span>::<span class="ident">ChildStdin</span> { <span class="kw">fn</span> <span class="ident">as_raw_fd</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">RawFd</span> { <span class="self">self</span>.<span class="ident">as_inner</span>().<span class="ident">fd</span>().<span class="ident">raw</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"process_extensions"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">AsRawFd</span> <span class="kw">for</span> <span class="ident">process</span>::<span class="ident">ChildStdout</span> { <span class="kw">fn</span> <span class="ident">as_raw_fd</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">RawFd</span> { <span class="self">self</span>.<span class="ident">as_inner</span>().<span class="ident">fd</span>().<span class="ident">raw</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"process_extensions"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">AsRawFd</span> <span class="kw">for</span> <span class="ident">process</span>::<span class="ident">ChildStderr</span> { <span class="kw">fn</span> <span class="ident">as_raw_fd</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">RawFd</span> { <span class="self">self</span>.<span class="ident">as_inner</span>().<span class="ident">fd</span>().<span class="ident">raw</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"into_raw_os"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">IntoRawFd</span> <span class="kw">for</span> <span class="ident">process</span>::<span class="ident">ChildStdin</span> { <span class="kw">fn</span> <span class="ident">into_raw_fd</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">RawFd</span> { <span class="self">self</span>.<span class="ident">into_inner</span>().<span class="ident">into_fd</span>().<span class="ident">into_raw</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"into_raw_os"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">IntoRawFd</span> <span class="kw">for</span> <span class="ident">process</span>::<span class="ident">ChildStdout</span> { <span class="kw">fn</span> <span class="ident">into_raw_fd</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">RawFd</span> { <span class="self">self</span>.<span class="ident">into_inner</span>().<span class="ident">into_fd</span>().<span class="ident">into_raw</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"into_raw_os"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">IntoRawFd</span> <span class="kw">for</span> <span class="ident">process</span>::<span class="ident">ChildStderr</span> { <span class="kw">fn</span> <span class="ident">into_raw_fd</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">RawFd</span> { <span class="self">self</span>.<span class="ident">into_inner</span>().<span class="ident">into_fd</span>().<span class="ident">into_raw</span>() } } <span class="doccomment">/// Returns the OS-assigned process identifier associated with this process's parent.</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"unix_ppid"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"46104"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parent_id</span>() <span class="op">-></span> <span class="ident">u32</span> { ::<span class="ident">sys</span>::<span class="ident">os</span>::<span class="ident">getppid</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><kbd>?</kbd></dt> <dd>Show this help dialog</dd> <dt><kbd>S</kbd></dt> <dd>Focus the search field</dd> <dt><kbd>↑</kbd></dt> <dd>Move up in search results</dd> <dt><kbd>↓</kbd></dt> <dd>Move down in search results</dd> <dt><kbd>↹</kbd></dt> <dd>Switch tab</dd> <dt><kbd>⏎</kbd></dt> <dd>Go to active search result</dd> <dt><kbd>+</kbd></dt> <dd>Expand all 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