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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="Implementation of syscalls"><title>os::syscall - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Bold-a2c9cd1067f8b328.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-fa3bb1812debf86c.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="os" data-themes="" data-resource-suffix="" data-rustdoc-version="1.75.0-nightly (bf9a1c8a1 2023-10-08)" data-channel="nightly" data-search-js="search-5f5ec5419eadd0c9.js" data-settings-js="settings-74424d7eec62a23e.js" ><script src="../../static.files/storage-fec3eaa3851e447d.js"></script><script defer src="../../static.files/main-c5bd66d33317d69f.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-5d8b3c7633ad77ba.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod"><!--[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">&#9776;</button><a class="logo-container" href="../../os/index.html"><img class="rust-logo" src="../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a></nav><nav class="sidebar"><a class="logo-container" href="../../os/index.html"><img class="rust-logo" src="../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a><h2 class="location"><a href="#">Module syscall</a></h2><div class="sidebar-elems"><section><ul class="block"><li><a href="#modules">Modules</a></li><li><a href="#constants">Constants</a></li><li><a href="#functions">Functions</a></li></ul></section></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Module <a href="../index.html">os</a>::<wbr><a class="mod" href="#">syscall</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../src/os/syscall/mod.rs.html#1-35">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Implementation of syscalls</p>
<p>The single entry point to all system calls, <a href="fn.syscall.html" title="fn os::syscall::syscall"><code>syscall()</code></a>, is called
whenever userspace wishes to perform a system call using the <code>ecall</code>
instruction. In this case, the processor raises an ‘Environment call from
U-mode’ exception, which is handled as one of the cases in
<a href="../trap/fn.trap_handler.html" title="fn os::trap::trap_handler"><code>crate::trap::trap_handler</code></a>.</p>
<p>For clarity, each single syscall is implemented as its own function, named
<code>sys_</code> then the name of the syscall. You can find functions like this in
submodules, and you should also implement syscalls this way.</p>
</div></details><h2 id="modules" class="small-section-header"><a href="#modules">Modules</a></h2><ul class="item-table"><li><div class="item-name"><a class="mod" href="fs/index.html" title="mod os::syscall::fs">fs</a><span title="Restricted Visibility">&nbsp;🔒</span> </div><div class="desc docblock-short">File and filesystem-related syscalls</div></li><li><div class="item-name"><a class="mod" href="process/index.html" title="mod os::syscall::process">process</a><span title="Restricted Visibility">&nbsp;🔒</span> </div><div class="desc docblock-short">Process management syscalls</div></li></ul><h2 id="constants" class="small-section-header"><a href="#constants">Constants</a></h2><ul class="item-table"><li><div class="item-name"><a class="constant" href="constant.SYSCALL_EXIT.html" title="constant os::syscall::SYSCALL_EXIT">SYSCALL_EXIT</a><span title="Restricted Visibility">&nbsp;🔒</span> </div></li><li><div class="item-name"><a class="constant" href="constant.SYSCALL_GET_TIME.html" title="constant os::syscall::SYSCALL_GET_TIME">SYSCALL_GET_TIME</a><span title="Restricted Visibility">&nbsp;🔒</span> </div></li><li><div class="item-name"><a class="constant" href="constant.SYSCALL_SBRK.html" title="constant os::syscall::SYSCALL_SBRK">SYSCALL_SBRK</a><span title="Restricted Visibility">&nbsp;🔒</span> </div></li><li><div class="item-name"><a class="constant" href="constant.SYSCALL_WRITE.html" title="constant os::syscall::SYSCALL_WRITE">SYSCALL_WRITE</a><span title="Restricted Visibility">&nbsp;🔒</span> </div></li><li><div class="item-name"><a class="constant" href="constant.SYSCALL_YIELD.html" title="constant os::syscall::SYSCALL_YIELD">SYSCALL_YIELD</a><span title="Restricted Visibility">&nbsp;🔒</span> </div></li></ul><h2 id="functions" class="small-section-header"><a href="#functions">Functions</a></h2><ul class="item-table"><li><div class="item-name"><a class="fn" href="fn.syscall.html" title="fn os::syscall::syscall">syscall</a></div><div class="desc docblock-short">handle syscall exception with <code>syscall_id</code> and other arguments</div></li></ul></section></div></main></body></html>
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