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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 `gethostname` fn in crate `nix`."><meta name="keywords" content="rust, rustlang, rust-lang, gethostname"><title>nix::unistd::gethostname - 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: 'gethostname', 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#887-896' 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=''>gethostname</a></span></h1><pre class='rust fn'>pub fn gethostname(buffer: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&mut [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -> <a class="type" href="../../nix/type.Result.html" title="type nix::Result">Result</a><&<a class="struct" href="https://doc.rust-lang.org/nightly/std/ffi/c_str/struct.CStr.html" title="struct std::ffi::c_str::CStr">CStr</a>></pre><div class='docblock'><p>Get the host name and store it in the provided buffer, returning a pointer
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the <code>CStr</code> in that buffer on success (see
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<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/gethostname.html">gethostname(2)</a>).</p>
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<p>This function call attempts to get the host name for the running system and
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store it in a provided buffer. The buffer will be populated with bytes up
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to the length of the provided slice including a NUL terminating byte. If
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the hostname is longer than the length provided, no error will be provided.
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The posix specification does not specify whether implementations will
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null-terminate in this case, but the nix implementation will ensure that the
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buffer is null terminated in this case.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">nix</span>::<span class="ident">unistd</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0u8</span>; <span class="number">64</span>];
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<span class="kw">let</span> <span class="ident">hostname_cstr</span> <span class="op">=</span> <span class="ident">unistd</span>::<span class="ident">gethostname</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">expect</span>(<span class="string">"Failed getting hostname"</span>);
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<span class="kw">let</span> <span class="ident">hostname</span> <span class="op">=</span> <span class="ident">hostname_cstr</span>.<span class="ident">to_str</span>().<span class="ident">expect</span>(<span class="string">"Hostname wasn't valid UTF-8"</span>);
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"Hostname: {}"</span>, <span class="ident">hostname</span>);</pre></div>
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