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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>readlink</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_007_1915"> </a>NAME</h4><blockquote>readlink - read the contents of a symbolic link</blockquote><h4><a name = "tag_000_007_1916"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="unistd.h.html">unistd.h</a>>int readlink(const char *<i>path</i>, char *<i>buf</i>, size_t <i>bufsize</i>);</code></pre></blockquote><h4><a name = "tag_000_007_1917"> </a>DESCRIPTION</h4><blockquote>The<i>readlink()</i>function places the contents of the symbolic link referred to by <i>path</i> inthe buffer <i>buf</i> which has size <i>bufsize</i>. If the number of bytes inthe symbolic link is less than <i>bufsize</i>,the contents of the remainder of <i>buf</i> are unspecified.</blockquote><h4><a name = "tag_000_007_1918"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>readlink()</i>returns the count of bytes placed in the buffer. Otherwise, it returns avalue of -1, leaves the buffer unchanged, and sets <i>errno</i> to indicatethe error.</blockquote><h4><a name = "tag_000_007_1919"> </a>ERRORS</h4><blockquote>The<i>readlink()</i>function will fail if:<dl compact><dt>[EACCES]<dd>Search permission is denied for a component of the path prefix of <i>path</i>.<dt>[EINVAL]<dd>The <i>path</i> argument names a file that is not a symbolic link.<dt>[EIO]<dd>An I/O error occurred while reading from the file system.<dt>[ENOENT]<dd>A component of <i>path</i> does not name an existing fileor <i>path</i> is an empty string.<dt>[ELOOP]<dd>Too many symbolic links were encountered in resolving <i>path</i>.<dt>[ENAMETOOLONG]<dd>The length of <i>path</i> exceeds {PATH_MAX}, or a pathname component is longerthan {NAME_MAX}.<dt>[ENOTDIR]<dd>A component of the path prefix is not a directory.</dl><p>The<i>readlink()</i>function may fail if:<dl compact><dt>[EACCES]<dd>Read permission is denied for the directory.<dt>[ENAMETOOLONG]<dd>Pathname resolution of a symbolic link produced an intermediate result whoselength exceeds {PATH_MAX}.</dl></blockquote><h4><a name = "tag_000_007_1920"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1921"> </a>APPLICATION USAGE</h4><blockquote>Portable applications should not assume that the returned contents of thesymbolic link are null-terminated.</blockquote><h4><a name = "tag_000_007_1922"> </a>FUTURE DIRECTIONS</h4><blockquote>The return value may change in a future issue to align with IEEE PASC.</blockquote><h4><a name = "tag_000_007_1923"> </a>SEE ALSO</h4><blockquote><i><a href="stat.html">stat()</a></i>,<i><a href="symlink.html">symlink()</a></i>,<i><a href="unistd.h.html"><unistd.h></a></i>.</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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