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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="Source of the Rust file `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/getrandom-0.2.2/src/util_libc.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>util_libc.rs - 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="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="https://www.rust-lang.org/favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></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" role="button">☰</div><a href='../../getrandom/index.html'><div class='logo-container'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" height="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="comment">// Copyright 2019 Developers of the Rand project.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or https://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="attribute">#![<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">util</span>::<span class="ident">LazyUsize</span>, <span class="ident">Error</span>};
<span class="kw">use</span> <span class="ident">core</span>::{<span class="ident">num</span>::<span class="ident">NonZeroU32</span>, <span class="ident">ptr</span>::<span class="ident">NonNull</span>};
<span class="macro">cfg_if</span><span class="macro">!</span> {
<span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"openbsd"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>))]</span> {
<span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">__errno</span> <span class="kw">as</span> <span class="ident">errno_location</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"redox"</span>))]</span> {
<span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">__errno_location</span> <span class="kw">as</span> <span class="ident">errno_location</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"solaris"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"illumos"</span>))]</span> {
<span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">___errno</span> <span class="kw">as</span> <span class="ident">errno_location</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>))]</span> {
<span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">__error</span> <span class="kw">as</span> <span class="ident">errno_location</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"haiku"</span>)]</span> {
<span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">_errnop</span> <span class="kw">as</span> <span class="ident">errno_location</span>;
}
}
<span class="macro">cfg_if</span><span class="macro">!</span> {
<span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"vxworks"</span>)]</span> {
<span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">errnoGet</span> <span class="kw">as</span> <span class="ident">get_errno</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"dragonfly"</span>)]</span> {
<span class="comment">// Until rust-lang/rust#29594 is stable, we cannot get the errno value</span>
<span class="comment">// on DragonFlyBSD. So we just return an out-of-range errno.</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_errno</span>() <span class="op">-</span><span class="op">></span> <span class="ident">libc</span>::<span class="ident">c_int</span> { <span class="op">-</span><span class="number">1</span> }
} <span class="kw">else</span> {
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_errno</span>() <span class="op">-</span><span class="op">></span> <span class="ident">libc</span>::<span class="ident">c_int</span> { <span class="kw-2">*</span><span class="ident">errno_location</span>() }
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">last_os_error</span>() <span class="op">-</span><span class="op">></span> <span class="ident">Error</span> {
<span class="kw">let</span> <span class="ident">errno</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">get_errno</span>() };
<span class="kw">if</span> <span class="ident">errno</span> <span class="op">></span> <span class="number">0</span> {
<span class="ident">Error</span>::<span class="ident">from</span>(<span class="ident">NonZeroU32</span>::<span class="ident">new</span>(<span class="ident">errno</span> <span class="kw">as</span> <span class="ident">u32</span>).<span class="ident">unwrap</span>())
} <span class="kw">else</span> {
<span class="ident">Error</span>::<span class="ident">ERRNO_NOT_POSITIVE</span>
}
}
<span class="comment">// Fill a buffer by repeatedly invoking a system call. The `sys_fill` function:</span>
<span class="comment">// - should return -1 and set errno on failure</span>
<span class="comment">// - should return the number of bytes written on success</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sys_fill_exact</span>(
<span class="kw-2">mut</span> <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>],
<span class="ident">sys_fill</span>: <span class="kw">impl</span> <span class="ident">Fn</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">libc</span>::<span class="ident">ssize_t</span>,
) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">Error</span><span class="op">></span> {
<span class="kw">while</span> <span class="op">!</span><span class="ident">buf</span>.<span class="ident">is_empty</span>() {
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">sys_fill</span>(<span class="ident">buf</span>);
<span class="kw">if</span> <span class="ident">res</span> <span class="op"><</span> <span class="number">0</span> {
<span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="ident">last_os_error</span>();
<span class="comment">// We should try again if the call was interrupted.</span>
<span class="kw">if</span> <span class="ident">err</span>.<span class="ident">raw_os_error</span>() <span class="op">!</span><span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">libc</span>::<span class="ident">EINTR</span>) {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">err</span>);
}
} <span class="kw">else</span> {
<span class="comment">// We don't check for EOF (ret = 0) as the data we are reading</span>
<span class="comment">// should be an infinite stream of random bytes.</span>
<span class="ident">buf</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>[(<span class="ident">res</span> <span class="kw">as</span> <span class="ident">usize</span>)..];
}
}
<span class="prelude-val">Ok</span>(())
}
<span class="comment">// A "weak" binding to a C function that may or may not be present at runtime.</span>
<span class="comment">// Used for supporting newer OS features while still building on older systems.</span>
<span class="comment">// F must be a function pointer of type `unsafe extern "C" fn`. Based off of the</span>
<span class="comment">// weak! macro in libstd.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Weak</span> {
<span class="ident">name</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>,
<span class="ident">addr</span>: <span class="ident">LazyUsize</span>,
}
<span class="kw">impl</span> <span class="ident">Weak</span> {
<span class="comment">// Construct a binding to a C function with a given name. This function is</span>
<span class="comment">// unsafe because `name` _must_ be null terminated.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">name</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="self">Self</span> {
<span class="ident">name</span>,
<span class="ident">addr</span>: <span class="ident">LazyUsize</span>::<span class="ident">new</span>(),
}
}
<span class="comment">// Return a function pointer if present at runtime. Otherwise, return null.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ptr</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">NonNull</span><span class="op"><</span><span class="ident">libc</span>::<span class="ident">c_void</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">addr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">addr</span>.<span class="ident">unsync_init</span>(<span class="op">|</span><span class="op">|</span> <span class="kw">unsafe</span> {
<span class="ident">libc</span>::<span class="ident">dlsym</span>(<span class="ident">libc</span>::<span class="ident">RTLD_DEFAULT</span>, <span class="self">self</span>.<span class="ident">name</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</span>) <span class="kw">as</span> <span class="ident">usize</span>
});
<span class="ident">NonNull</span>::<span class="ident">new</span>(<span class="ident">addr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>)
}
}
<span class="macro">cfg_if</span><span class="macro">!</span> {
<span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>))]</span> {
<span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">open64</span> <span class="kw">as</span> <span class="ident">open</span>;
} <span class="kw">else</span> {
<span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">open</span>;
}
}
<span class="comment">// SAFETY: path must be null terminated, FD must be manually closed.</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">open_readonly</span>(<span class="ident">path</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">libc</span>::<span class="ident">c_int</span>, <span class="ident">Error</span><span class="op">></span> {
<span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">path</span>.<span class="ident">as_bytes</span>().<span class="ident">last</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">0</span>));
<span class="kw">let</span> <span class="ident">fd</span> <span class="op">=</span> <span class="ident">open</span>(<span class="ident">path</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</span>, <span class="ident">libc</span>::<span class="ident">O_RDONLY</span> <span class="op">|</span> <span class="ident">libc</span>::<span class="ident">O_CLOEXEC</span>);
<span class="kw">if</span> <span class="ident">fd</span> <span class="op"><</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">last_os_error</span>());
}
<span class="prelude-val">Ok</span>(<span class="ident">fd</span>)
}
</pre></div>
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