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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>chroot</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_001_458"> </a>NAME</h4><blockquote>chroot - change root directory(<b>LEGACY</b>)</blockquote><h4><a name = "tag_000_001_459"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="unistd.h.html">unistd.h</a>>int chroot(const char *<i>path</i>);</code></pre></blockquote><h4><a name = "tag_000_001_460"> </a>DESCRIPTION</h4><blockquote>The<i>path</i>argument points to a pathname naming a directory.The<i>chroot()</i>function causes the named directory to become the root directory;that is, the starting point for path searches for pathnames beginningwith /.The process' working directory is unaffected by<i>chroot()</i>.<p>The process must have appropriate privileges to change the root directory.<p>The dot-dot entry in the root directory is interpreted to meanthe root directory itself.Thus, dot-dot cannot be used to access files outside the subtreerooted at the root directory.<p>This interface need not be reentrant.</blockquote><h4><a name = "tag_000_001_461"> </a>RETURN VALUE</h4><blockquote>Upon successful completion, 0 is returned.Otherwise, -1 is returned and<i>errno</i>is set to indicate the error. If -1 is returned, no change ismade in the root directory.</blockquote><h4><a name = "tag_000_001_462"> </a>ERRORS</h4><blockquote>The<i>chroot()</i>functionwill fail if:<dl compact><dt>[EACCES]<dd>Search permission is denied for a component of<i>path</i>.<dt>[ELOOP]<dd>Too many symbolic links were encountered in resolving <i>path</i>.<dt>[ENAMETOOLONG]<dd>The length of the<i>path</i>argument exceeds {PATH_MAX} or a pathname component islonger than {NAME_MAX}.<dt>[ENOENT]<dd>A component of <i>path</i> does not name an existing directoryor <i>path</i> is an empty string.<dt>[ENOTDIR]<dd>A component of the <i>path</i> name is not a directory.<dt>[EPERM]<dd>The effective user ID does not have appropriate privileges.</dl><p>The<i>chroot()</i>function may fail if:<dl compact><dt>[ENAMETOOLONG]<dd>Pathname resolution of a symbolic link produced an intermediate result whoselength exceeds {PATH_MAX}.</dl></blockquote><h4><a name = "tag_000_001_463"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_464"> </a>APPLICATION USAGE</h4><blockquote>There is no portable use that an application could make of thisinterface.</blockquote><h4><a name = "tag_000_001_465"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_466"> </a>SEE ALSO</h4><blockquote><i><a href="chdir.html">chdir()</a></i>,<i><a href="unistd.h.html"><unistd.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from Issue 1 of the SVID.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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