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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-0.2.7/src/util_libc.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>util_libc.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><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="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../getrandom/index.html"><div class="logo-container"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></div>
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</div></form></nav></div><section id="main-content" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1">1</span>
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</pre><pre class="rust"><code><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="ident"><span class="kw">crate</span>::Error</span>;
<span class="kw">use</span> <span class="ident">core</span>::{
<span class="ident">num::NonZeroU32</span>,
<span class="ident">ptr::NonNull</span>,
<span class="ident">sync::atomic</span>::{<span class="ident">fence</span>, <span class="ident">AtomicPtr</span>, <span class="ident">Ordering</span>},
};
<span class="kw">use</span> <span class="ident">libc::c_void</span>;
<span class="macro">cfg_if!</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::__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::__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::___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::__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::_errnop</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">all</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"horizon"</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"arm"</span>))]</span> {
<span class="kw">extern</span> <span class="string">"C"</span> {
<span class="comment">// Not provided by libc: https://github.com/rust-lang/libc/issues/1995</span>
<span class="kw">fn</span> <span class="ident">__errno</span>() -> <span class="kw-2">*mut</span> <span class="ident">libc::c_int</span>;
}
<span class="kw">use</span> <span class="ident">__errno</span> <span class="kw">as</span> <span class="ident">errno_location</span>;
}
}
<span class="macro">cfg_if!</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::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="ident">libc::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="ident">libc::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="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::from</span>(<span class="ident">NonZeroU32::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::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">&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">&mut</span> [<span class="ident">u8</span>]) -> <span class="ident">libc::ssize_t</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::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">&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">// Based off of the DlsymWeak struct in libstd:</span>
<span class="comment">// https://github.com/rust-lang/rust/blob/1.61.0/library/std/src/sys/unix/weak.rs#L84</span>
<span class="comment">// except that the caller must manually cast self.ptr() to a function pointer.</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">AtomicPtr</span><span class="op"><</span><span class="ident">c_void</span><span class="op">></span>,
}
<span class="kw">impl</span> <span class="ident">Weak</span> {
<span class="comment">// A non-null pointer value which indicates we are uninitialized. This</span>
<span class="comment">// constant should ideally not be a valid address of a function pointer.</span>
<span class="comment">// However, if by chance libc::dlsym does return UNINIT, there will not</span>
<span class="comment">// be undefined behavior. libc::dlsym will just be called each time ptr()</span>
<span class="comment">// is called. This would be inefficient, but correct.</span>
<span class="comment">// TODO: Replace with core::ptr::invalid_mut(1) when that is stable.</span>
<span class="kw">const</span> <span class="ident">UNINIT</span>: <span class="kw-2">*mut</span> <span class="ident">c_void</span> <span class="op">=</span> <span class="number">1</span> <span class="kw">as</span> <span class="kw-2">*mut</span> <span class="ident">c_void</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="self">Self</span> {
<span class="self">Self</span> {
<span class="ident">name</span>,
<span class="ident">addr</span>: <span class="ident">AtomicPtr::new</span>(<span class="ident"><span class="self">Self</span>::UNINIT</span>),
}
}
<span class="comment">// Return the address of a function if present at runtime. Otherwise,</span>
<span class="comment">// return None. Multiple callers can call ptr() concurrently. It will</span>
<span class="comment">// always return _some_ value returned by libc::dlsym. However, the</span>
<span class="comment">// dlsym function may be called multiple times.</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="prelude-ty">Option</span><span class="op"><</span><span class="ident">NonNull</span><span class="op"><</span><span class="ident">c_void</span><span class="op">></span><span class="op">></span> {
<span class="comment">// Despite having only a single atomic variable (self.addr), we still</span>
<span class="comment">// cannot always use Ordering::Relaxed, as we need to make sure a</span>
<span class="comment">// successful call to dlsym() is "ordered before" any data read through</span>
<span class="comment">// the returned pointer (which occurs when the function is called).</span>
<span class="comment">// Our implementation mirrors that of the one in libstd, meaning that</span>
<span class="comment">// the use of non-Relaxed operations is probably unnecessary.</span>
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">addr</span>.<span class="ident">load</span>(<span class="ident">Ordering::Relaxed</span>) {
<span class="ident"><span class="self">Self</span>::UNINIT</span> => {
<span class="kw">let</span> <span class="ident">symbol</span> <span class="op">=</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">*const</span> <span class="kw">_</span>;
<span class="kw">let</span> <span class="ident">addr</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc::dlsym</span>(<span class="ident">libc::RTLD_DEFAULT</span>, <span class="ident">symbol</span>) };
<span class="comment">// Synchronizes with the Acquire fence below</span>
<span class="self">self</span>.<span class="ident">addr</span>.<span class="ident">store</span>(<span class="ident">addr</span>, <span class="ident">Ordering::Release</span>);
<span class="ident">NonNull::new</span>(<span class="ident">addr</span>)
}
<span class="ident">addr</span> => {
<span class="kw">let</span> <span class="ident">func</span> <span class="op">=</span> <span class="ident">NonNull::new</span>(<span class="ident">addr</span>)<span class="question-mark">?</span>;
<span class="ident">fence</span>(<span class="ident">Ordering::Acquire</span>);
<span class="prelude-val">Some</span>(<span class="ident">func</span>)
}
}
}
}
<span class="macro">cfg_if!</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::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::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="prelude-ty">Result</span><span class="op"><</span><span class="ident">libc::c_int</span>, <span class="ident">Error</span><span class="op">></span> {
<span class="macro">debug_assert_eq!</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">loop</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">*const</span> <span class="kw">_</span>, <span class="ident">libc::O_RDONLY</span> <span class="op">|</span> <span class="ident">libc::O_CLOEXEC</span>);
<span class="kw">if</span> <span class="ident">fd</span> <span class="op">></span><span class="op">=</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">fd</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 open() 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::EINTR</span>) {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">err</span>);
}
}
}
</code></pre></div>
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