1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>User Space Memory Access</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux Kernel API"><link rel="up" href="mm.html" title="Chapter&#160;4.&#160;Memory Management in Linux"><link rel="prev" href="API-get-user-pages-fast.html" title="get_user_pages_fast"><link rel="next" href="API---copy-to-user-inatomic.html" title="__copy_to_user_inatomic"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">User Space Memory Access</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-get-user-pages-fast.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;4.&#160;Memory Management in Linux</th><td width="20%" align="right">&#160;<a accesskey="n" href="API---copy-to-user-inatomic.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp1123887852"></a>User Space Memory Access</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API---copy-to-user-inatomic.html"><span class="phrase">__copy_to_user_inatomic</span></a></span><span class="refpurpose"> &#8212; 
2  Copy a block of data into user space, with less checking.
3 </span></dt><dt><span class="refentrytitle"><a href="API---copy-to-user.html"><span class="phrase">__copy_to_user</span></a></span><span class="refpurpose"> &#8212; 
4     Copy a block of data into user space, with less checking.
5 </span></dt><dt><span class="refentrytitle"><a href="API---copy-from-user.html"><span class="phrase">__copy_from_user</span></a></span><span class="refpurpose"> &#8212; 
6     Copy a block of data from user space, with less checking.
7 </span></dt><dt><span class="refentrytitle"><a href="API-clear-user.html"><span class="phrase">clear_user</span></a></span><span class="refpurpose"> &#8212; 
8  Zero a block of memory in user space.
9 </span></dt><dt><span class="refentrytitle"><a href="API---clear-user.html"><span class="phrase">__clear_user</span></a></span><span class="refpurpose"> &#8212; 
10     Zero a block of memory in user space, with less checking.
11 </span></dt><dt><span class="refentrytitle"><a href="API--copy-to-user.html"><span class="phrase">_copy_to_user</span></a></span><span class="refpurpose"> &#8212; 
12     Copy a block of data into user space.
13 </span></dt><dt><span class="refentrytitle"><a href="API--copy-from-user.html"><span class="phrase">_copy_from_user</span></a></span><span class="refpurpose"> &#8212; 
14     Copy a block of data from user space.
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