<!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 to the Rust file `/home/mrh/.cargo/registry/src/github.com-1ecc6299db9ec823/nix-0.14.1/src/sys/ioctl/linux.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>linux.rs.html -- 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="../../../../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 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">☰</div><a href='../../../../nix/index.html'><div class='logo-container'><img src='../../../../rust-logo.png' alt='logo'></div></a></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"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">/// The datatype used for the ioctl number</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">"android"</span>, <span class="ident">target_env</span> <span class="op">=</span> <span class="string">"musl"</span>))]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">ioctl_num_type</span> <span class="op">=</span> ::<span class="ident">libc</span>::<span class="ident">c_int</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>, <span class="ident">target_env</span> <span class="op">=</span> <span class="string">"musl"</span>)))]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">ioctl_num_type</span> <span class="op">=</span> ::<span class="ident">libc</span>::<span class="ident">c_ulong</span>;
<span class="doccomment">/// The datatype used for the 3rd argument</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">ioctl_param_type</span> <span class="op">=</span> ::<span class="ident">libc</span>::<span class="ident">c_ulong</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">NRBITS</span>: <span class="ident">ioctl_num_type</span> <span class="op">=</span> <span class="number">8</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">TYPEBITS</span>: <span class="ident">ioctl_num_type</span> <span class="op">=</span> <span class="number">8</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"mips"</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"mips64"</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"powerpc"</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"powerpc64"</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"sparc64"</span>))]</span>
<span class="kw">mod</span> <span class="ident">consts</span> {
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">NONE</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">1</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">READ</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">2</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">WRITE</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">4</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">SIZEBITS</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">13</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">DIRBITS</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">3</span>;
}
<span class="comment">// "Generic" ioctl protocol</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"x86"</span>,
<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"arm"</span>,
<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"s390x"</span>,
<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"x86_64"</span>,
<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"aarch64"</span>))]</span>
<span class="kw">mod</span> <span class="ident">consts</span> {
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">NONE</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">0</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">READ</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">2</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">WRITE</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">1</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">SIZEBITS</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">14</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">DIRBITS</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">2</span>;
}
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">consts</span>::<span class="kw-2">*</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">NRSHIFT</span>: <span class="ident">ioctl_num_type</span> <span class="op">=</span> <span class="number">0</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">TYPESHIFT</span>: <span class="ident">ioctl_num_type</span> <span class="op">=</span> <span class="ident">NRSHIFT</span> <span class="op">+</span> <span class="ident">NRBITS</span> <span class="kw">as</span> <span class="ident">ioctl_num_type</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">SIZESHIFT</span>: <span class="ident">ioctl_num_type</span> <span class="op">=</span> <span class="ident">TYPESHIFT</span> <span class="op">+</span> <span class="ident">TYPEBITS</span> <span class="kw">as</span> <span class="ident">ioctl_num_type</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">DIRSHIFT</span>: <span class="ident">ioctl_num_type</span> <span class="op">=</span> <span class="ident">SIZESHIFT</span> <span class="op">+</span> <span class="ident">SIZEBITS</span> <span class="kw">as</span> <span class="ident">ioctl_num_type</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">NRMASK</span>: <span class="ident">ioctl_num_type</span> <span class="op">=</span> (<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="ident">NRBITS</span>) <span class="op">-</span> <span class="number">1</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">TYPEMASK</span>: <span class="ident">ioctl_num_type</span> <span class="op">=</span> (<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="ident">TYPEBITS</span>) <span class="op">-</span> <span class="number">1</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">SIZEMASK</span>: <span class="ident">ioctl_num_type</span> <span class="op">=</span> (<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="ident">SIZEBITS</span>) <span class="op">-</span> <span class="number">1</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">DIRMASK</span>: <span class="ident">ioctl_num_type</span> <span class="op">=</span> (<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="ident">DIRBITS</span>) <span class="op">-</span> <span class="number">1</span>;
<span class="doccomment">/// Encode an ioctl command.</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">ioc</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">dir</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">nr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">sz</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (
((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">dir</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">ioctl_num_type</span> <span class="op">&</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">DIRMASK</span>) <span class="op"><</span><span class="op"><</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">DIRSHIFT</span>) <span class="op">|</span>
((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">ioctl_num_type</span> <span class="op">&</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">TYPEMASK</span>) <span class="op"><</span><span class="op"><</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">TYPESHIFT</span>) <span class="op">|</span>
((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">nr</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">ioctl_num_type</span> <span class="op">&</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">NRMASK</span>) <span class="op"><</span><span class="op"><</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">NRSHIFT</span>) <span class="op">|</span>
((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">sz</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">ioctl_num_type</span> <span class="op">&</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">SIZEMASK</span>) <span class="op"><</span><span class="op"><</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">SIZESHIFT</span>))
}
<span class="doccomment">/// Generate an ioctl request code for a command that passes no data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is equivalent to the `_IO()` macro exposed by the C ioctl API.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// You should only use this macro directly if the `ioctl` you're working</span>
<span class="doccomment">/// with is "bad" and you cannot use `ioctl_none!()` directly.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use] extern crate nix;</span>
<span class="doccomment">/// const KVMIO: u8 = 0xAE;</span>
<span class="doccomment">/// ioctl_write_int_bad!(kvm_create_vm, request_code_none!(KVMIO, 0x03));</span>
<span class="doccomment">/// # fn main() {}</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">macro_export</span>(<span class="ident">local_inner_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">request_code_none</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">nr</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (<span class="macro">ioc</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">NONE</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">nr</span>, <span class="number">0</span>))
}
<span class="doccomment">/// Generate an ioctl request code for a command that reads.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is equivalent to the `_IOR()` macro exposed by the C ioctl API.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// You should only use this macro directly if the `ioctl` you're working</span>
<span class="doccomment">/// with is "bad" and you cannot use `ioctl_read!()` directly.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The read/write direction is relative to userland, so this</span>
<span class="doccomment">/// command would be userland is reading and the kernel is</span>
<span class="doccomment">/// writing.</span>
<span class="attribute">#[<span class="ident">macro_export</span>(<span class="ident">local_inner_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">request_code_read</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">nr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">sz</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (<span class="macro">ioc</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">READ</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">nr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">sz</span>))
}
<span class="doccomment">/// Generate an ioctl request code for a command that writes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is equivalent to the `_IOW()` macro exposed by the C ioctl API.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// You should only use this macro directly if the `ioctl` you're working</span>
<span class="doccomment">/// with is "bad" and you cannot use `ioctl_write!()` directly.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The read/write direction is relative to userland, so this</span>
<span class="doccomment">/// command would be userland is writing and the kernel is</span>
<span class="doccomment">/// reading.</span>
<span class="attribute">#[<span class="ident">macro_export</span>(<span class="ident">local_inner_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">request_code_write</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">nr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">sz</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (<span class="macro">ioc</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">WRITE</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">nr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">sz</span>))
}
<span class="doccomment">/// Generate an ioctl request code for a command that reads and writes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is equivalent to the `_IOWR()` macro exposed by the C ioctl API.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// You should only use this macro directly if the `ioctl` you're working</span>
<span class="doccomment">/// with is "bad" and you cannot use `ioctl_readwrite!()` directly.</span>
<span class="attribute">#[<span class="ident">macro_export</span>(<span class="ident">local_inner_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">request_code_readwrite</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">nr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">sz</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (<span class="macro">ioc</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">READ</span> <span class="op">|</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">sys</span>::<span class="ident">ioctl</span>::<span class="ident">WRITE</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">nr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">sz</span>))
}
</pre></div>
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