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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>realpath</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_1936"> </a>NAME</h4><blockquote>realpath - resolve a pathname</blockquote><h4><a name = "tag_000_007_1937"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stdlib.h.html">stdlib.h</a>>char *realpath(const char *<i>file_name</i>, char *<i>resolved_name</i>);</code></pre></blockquote><h4><a name = "tag_000_007_1938"> </a>DESCRIPTION</h4><blockquote>The<i>realpath()</i>function derives, from the pathname pointed to by<i>file_name</i>,an absolute pathname that names the same file, whose resolution does notinvolve ".", "..", or symbolic links. The generated pathname is stored, up toa maximum of {PATH_MAX} bytes, in the buffer pointed to by<i>resolved_name</i>.</blockquote><h4><a name = "tag_000_007_1939"> </a>RETURN VALUE</h4><blockquote>On successful completion,<i>realpath()</i>returns a pointer to the resolved name. Otherwise,<i>realpath()</i>returns a null pointer and sets <i>errno</i> to indicate the error, and thecontents of the buffer pointed to by <i>resolved_name</i> are undefined.</blockquote><h4><a name = "tag_000_007_1940"> </a>ERRORS</h4><blockquote>The<i>realpath()</i>function will fail if:<dl compact><dt>[EACCES]<dd>Read or search permission was denied for a component of<i>file_name</i>.<dt>[EINVAL]<dd>Either the <i>file_name</i> or <i>resolved_name</i> argument is a null pointer.<dt>[EIO]<dd>An error occurred while reading from the file system.<dt>[ELOOP]<dd>Too many symbolic links were encountered in resolving <i>path</i>.<dt>[ENAMETOOLONG]<dd>The <i>file_name</i> argument is longer than {PATH_MAX} ora pathname component is longer than {NAME_MAX}.<dt>[ENOENT]<dd>A component of <i>file_name</i> does not name an existing fileor <i>file_name</i> points to an empty string.<dt>[ENOTDIR]<dd>A component of the path prefix is not a directory.</dl><p>The<i>realpath()</i>function may fail if:<dl compact><dt>[ENAMETOOLONG]<dd>Pathname resolution of a symbolic link produced an intermediate result whoselength exceeds {PATH_MAX}.<dt>[ENOMEM]<dd>Insufficient storage space is available.</dl></blockquote><h4><a name = "tag_000_007_1941"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1942"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1943"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1944"> </a>SEE ALSO</h4><blockquote><i><a href="getcwd.html">getcwd()</a></i>,<i><a href="sysconf.html">sysconf()</a></i>,<i><a href="stdlib.h.html"><stdlib.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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