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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>getdtablesize</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_005_506"> </a>NAME</h4><blockquote>getdtablesize - get the file descriptor table size(<b>LEGACY</b>)</blockquote><h4><a name = "tag_000_005_507"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="unistd.h.html">unistd.h</a>>int getdtablesize(void);</code></pre></blockquote><h4><a name = "tag_000_005_508"> </a>DESCRIPTION</h4><blockquote>The<i>getdtablesize()</i>function is equivalent to<i><a href="getrlimit.html">getrlimit()</a></i>with the RLIMIT_NOFILE option.<p>This interface need not be reentrant.</blockquote><h4><a name = "tag_000_005_509"> </a>RETURN VALUE</h4><blockquote>The<i>getdtablesize()</i>function returns the current soft limit as if obtained from a call to<i><a href="getrlimit.html">getrlimit()</a></i>with the RLIMIT_NOFILE option.</blockquote><h4><a name = "tag_000_005_510"> </a>ERRORS</h4><blockquote><p>No errors are defined.</blockquote><h4><a name = "tag_000_005_511"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_512"> </a>APPLICATION USAGE</h4><blockquote>There is no direct relationship between the value returned by<i>getdtablesize()</i>and {OPEN_MAX} defined in<i><a href="limits.h.html"><limits.h></a></i>.<p>The <i><a href="getrlimit.html">getrlimit()</a></i>function returns a value of type <b>rlim_t</b>.This interface, returning an <b>int</b>,may have problems representing appropriate values in the future. Applications should use the <i><a href="getrlimit.html">getrlimit()</a></i>function instead.</blockquote><h4><a name = "tag_000_005_513"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_514"> </a>SEE ALSO</h4><blockquote><i><a href="close.html">close()</a></i>,<i><a href="getrlimit.html">getrlimit()</a></i>,<i><a href="open.html">open()</a></i>,<i><a href="select.html">select()</a></i>,<i><a href="setrlimit.html">setrlimit()</a></i>,<i><a href="limits.h.html"><limits.h></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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