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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>FD_CLR</title></head><body bgcolor=white><center><font size=2>The Single UNIX &reg; Specification, Version 2<br>Copyright &copy; 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_000_001">&nbsp;</a>NAME</h4><blockquote>FD_CLR - macros for synchronous I/O multiplexing</blockquote><h4><a name = "tag_000_000_002">&nbsp;</a>SYNOPSIS</h4><blockquote><pre><code>#include &lt;<a href="systime.h.html">sys/time.h</a>&gt;FD_CLR(int <i>fd</i>, fd_set *<i>fdset</i>);FD_ISSET(int <i>fd</i>, fd_set *<i>fdset</i>);FD_SET(int <i>fd</i>, fd_set *<i>fdset</i>);FD_ZERO(fd_set *<i>fdset</i>);</code></pre></blockquote><h4><a name = "tag_000_000_003">&nbsp;</a>DESCRIPTION</h4><blockquote>Refer to<i><a href="select.html">select()</a></i>.</blockquote><h4><a name = "tag_000_000_004">&nbsp;</a>SEE ALSO</h4><blockquote><i><a href="systime.h.html">&lt;sys/time.h&gt;</a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX &reg; is a registered Trademark of The Open Group.<br>Copyright &copy; 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>

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