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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `select` fn in crate `nix`."><meta name="keywords" content="rust, rustlang, rust-lang, select"><title>nix::sys::select::select - Rust</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="shortcut icon" href="../../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[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='../../../nix/index.html'><div class='logo-container'><img src='../../../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class='location'><a href='../../index.html'>nix</a>::<wbr><a href='../index.html'>sys</a>::<wbr><a href='index.html'>select</a></p><script>window.sidebarCurrent = {name: 'select', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></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"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../../src/nix/sys/select.rs.html#96-133' title='goto source code'>[src]</a></span><span class='in-band'>Function <a href='../../index.html'>nix</a>::<wbr><a href='../index.html'>sys</a>::<wbr><a href='index.html'>select</a>::<wbr><a class="fn" href=''>select</a></span></h1><pre class='rust fn'>pub fn select<'a, N, R, W, E, T>(<br> nfds: N, <br> readfds: R, <br> writefds: W, <br> errorfds: E, <br> timeout: T<br>) -> <a class="type" href="../../../nix/type.Result.html" title="type nix::Result">Result</a><<a class="type" href="../../../libc/unix/type.c_int.html" title="type libc::unix::c_int">c_int</a>> <span class="where fmt-newline">where<br> N: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="type" href="../../../libc/unix/type.c_int.html" title="type libc::unix::c_int">c_int</a>>>,<br> R: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a mut <a class="struct" href="../../../nix/sys/select/struct.FdSet.html" title="struct nix::sys::select::FdSet">FdSet</a>>>,<br> W: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a mut <a class="struct" href="../../../nix/sys/select/struct.FdSet.html" title="struct nix::sys::select::FdSet">FdSet</a>>>,<br> E: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a mut <a class="struct" href="../../../nix/sys/select/struct.FdSet.html" title="struct nix::sys::select::FdSet">FdSet</a>>>,<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a mut <a class="struct" href="../../../nix/sys/time/struct.TimeVal.html" title="struct nix::sys::time::TimeVal">TimeVal</a>>>, </span></pre><div class='docblock'><p>Monitors file descriptors for readiness</p>
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<p>Returns the total number of ready file descriptors in all sets. The sets are changed so that all
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file descriptors that are ready for the given operation are set.</p>
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<p>When this function returns, <code>timeout</code> has an implementation-defined value.</p>
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<h1 id="parameters" class="section-header"><a href="#parameters">Parameters</a></h1>
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<ul>
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<li><code>nfds</code>: The highest file descriptor set in any of the passed <code>FdSet</code>s, plus 1. If <code>None</code>, this
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is calculated automatically by calling <a href="struct.FdSet.html#method.highest"><code>FdSet::highest</code></a> on all descriptor sets and adding 1
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to the maximum of that.</li>
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<li><code>readfds</code>: File descriptors to check for being ready to read.</li>
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<li><code>writefds</code>: File descriptors to check for being ready to write.</li>
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<li><code>errorfds</code>: File descriptors to check for pending error conditions.</li>
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<li><code>timeout</code>: Maximum time to wait for descriptors to become ready (<code>None</code> to block
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indefinitely).</li>
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</ul>
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<h1 id="references" class="section-header"><a href="#references">References</a></h1>
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<p><a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/select.html">select(2)</a></p>
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