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<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `fpathconf` fn in crate `nix`."><metaname="keywords"content="rust, rustlang, rust-lang, fpathconf"><title>nix::unistd::fpathconf - Rust</title><linkrel="stylesheet"type="text/css"href="../../normalize.css"><linkrel="stylesheet"type="text/css"href="../../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../../dark.css"><linkrel="stylesheet"type="text/css"href="../../light.css"id="themeStyle"><scriptsrc="../../storage.js"></script><noscript><linkrel="stylesheet"href="../../noscript.css"></noscript><linkrel="shortcut icon"href="../../favicon.ico"><styletype="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><bodyclass="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><ahref='../../nix/index.html'><divclass='logo-container'><imgsrc='../../rust-logo.png'alt='logo'></div></a><divclass="sidebar-elems"><pclass='location'><ahref='../index.html'>nix</a>::<wbr><ahref='index.html'>unistd</a></p><script>window.sidebarCurrent={name:'fpathconf',ty:'fn',relpath:''};</script><scriptdefersrc="sidebar-items.js"></script></div></nav><divclass="theme-picker"><buttonid="theme-picker"aria-label="Pick another theme!"><imgsrc="../../brush.svg"width="18"alt="Pick another theme!"></button><divid="theme-choices"></div></div><scriptsrc="../../theme.js"></script><navclass="sub"><formclass="search-form js-only"><divclass="search-container"><div><selectid="crate-search"><optionvalue="All crates">All crates</option></select><inputclass="search-input"name="search"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"></div><aid="settings-menu"href="../../settings.html"><imgsrc="../../wheel.svg"width="18"alt="Change settings"></a></div></form></nav><sectionid="main"class="content"><h1class='fqn'><spanclass='out-of-band'><spanid='render-detail'><aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass='inner'>−</span>]</a></span><aclass='srclink'href='../../src/nix/unistd.rs.html#1777-1791'title='goto source code'>[src]</a></span><spanclass='in-band'>Function <ahref='../index.html'>nix</a>::<wbr><ahref='index.html'>unistd</a>::<wbr><aclass="fn"href=''>fpathconf</a></span></h1><preclass='rust fn'>pub fn fpathconf(fd: <aclass="type"href="https://doc.rust-lang.org/nightly/std/sys/unix/ext/io/type.RawFd.html"title="type std::sys::unix::ext::io::RawFd">RawFd</a>, var: <aclass="enum"href="../../nix/unistd/enum.PathconfVar.html"title="enum nix::unistd::PathconfVar">PathconfVar</a>) -><aclass="type"href="../../nix/type.Result.html"title="type nix::Result">Result</a><<aclass="enum"href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="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><divclass='docblock'><p>Like <code>pathconf</code>, but works with file descriptors instead of paths (see
<li><code>Ok(Some(x))</code>: the variable's limit (for limit variables) or its
implementation level (for option variables). Implementation levels are
usually a decimal-coded date, such as 200112 for POSIX 2001.12</li>
<li><code>Ok(None)</code>: the variable has no limit (for limit variables) or is
unsupported (for option variables)</li>
<li><code>Err(x)</code>: an error occurred</li>
</ul>
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