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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 `pathconf` fn in crate `nix`."><meta name="keywords" content="rust, rustlang, rust-lang, pathconf"><title>nix::unistd::pathconf - 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'>unistd</a></p><script>window.sidebarCurrent = {name: 'pathconf', 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/unistd.rs.html#1814-1830' title='goto source code'>[src]</a></span><span class='in-band'>Function <a href='../index.html'>nix</a>::<wbr><a href='index.html'>unistd</a>::<wbr><a class="fn" href=''>pathconf</a></span></h1><pre class='rust fn'>pub fn pathconf<P: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="../../nix/trait.NixPath.html" title="trait nix::NixPath">NixPath</a>>(<br> path: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>P, <br> var: <a class="enum" href="../../nix/unistd/enum.PathconfVar.html" title="enum nix::unistd::PathconfVar">PathconfVar</a><br>) -> <a class="type" href="../../nix/type.Result.html" title="type nix::Result">Result</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/linux_like/linux/gnu/b64/x86_64/not_x32/type.c_long.html" title="type libc::unix::linux_like::linux::gnu::b64::x86_64::not_x32::c_long">c_long</a>>></pre><div class='docblock'><p>Get path-dependent configurable system variables (see
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<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/pathconf.html">pathconf(2)</a>)</p>
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<p>Returns the value of a path-dependent configurable system variable. Most
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supported variables also have associated compile-time constants, but POSIX
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allows their values to change at runtime. There are generally two types of
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<code>pathconf</code> variables: options and limits. See <a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/pathconf.html">pathconf(2)</a> for more details.</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>path</code>: Lookup the value of <code>var</code> for this file or directory</li>
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<li><code>var</code>: The <code>pathconf</code> variable to lookup</li>
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</ul>
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<h1 id="returns" class="section-header"><a href="#returns">Returns</a></h1>
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<ul>
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<li><code>Ok(Some(x))</code>: the variable's limit (for limit variables) or its
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implementation level (for option variables). Implementation levels are
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usually a decimal-coded date, such as 200112 for POSIX 2001.12</li>
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<li><code>Ok(None)</code>: the variable has no limit (for limit variables) or is
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unsupported (for option variables)</li>
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<li><code>Err(x)</code>: an error occurred</li>
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</ul>
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