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<html><head><title>Fcntl (Programming Perl)</title><!-- STYLESHEET --><link rel="stylesheet" type="text/css" href="../style/style1.css"><!-- METADATA --><!--Dublin Core Metadata--><meta name="DC.Creator" content=""><meta name="DC.Date" content=""><meta name="DC.Format" content="text/xml" scheme="MIME"><meta name="DC.Generator" content="XSLT stylesheet, xt by James Clark"><meta name="DC.Identifier" content=""><meta name="DC.Language" content="en-US"><meta name="DC.Publisher" content="O'Reilly &amp; Associates, Inc."><meta name="DC.Source" content="" scheme="ISBN"><meta name="DC.Subject.Keyword" content=""><meta name="DC.Title" content="Fcntl"><meta name="DC.Type" content="Text.Monograph"></head><body><!-- START OF BODY --><!-- TOP BANNER --><img src="gifs/smbanner.gif" usemap="#banner-map" border="0" alt="Book Home"><map name="banner-map"><AREA SHAPE="RECT" COORDS="0,0,466,71" HREF="index.htm" ALT="Programming Perl"><AREA SHAPE="RECT" COORDS="467,0,514,18" HREF="jobjects/fsearch.htm" ALT="Search this book"></map><!-- TOP NAV BAR --><div class="navbar"><table width="515" border="0"><tr><td align="left" valign="top" width="172"><a href="ch32_16.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0"></a></td><td align="center" valign="top" width="171"><a href="ch32_01.htm">Chapter 32: Standard Modules</a></td><td align="right" valign="top" width="172"><a href="ch32_18.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0"></a></td></tr></table></div><hr width="515" align="left"><!-- SECTION BODY --><h2 class="sect1">32.17. Fcntl</h2><p><blockquote><pre class="programlisting">use Fcntl;              # Import standard fcntl.h constants.use Fcntl ":flock";     # Import LOCK_* constants.use Fcntl ":seek";      # Import SEEK_CUR, SEEK_SET, SEEK_END.use Fcntl ":mode";      # Import S_* stat checking constants.use Fcntl ":Fcompat";   # Import F* constants.</pre></blockquote>The <tt class="literal">Fcntl</tt> module provides constants for use with various Perlbuilt-in functions.  The default set of imports includes constantslike <tt class="literal">F_GETFL</tt> and <tt class="literal">F_SETFL</tt> for <tt class="literal">fcntl</tt>, <tt class="literal">SEEK_SET</tt> and<tt class="literal">SEEK_END</tt> for <tt class="literal">seek</tt> and <tt class="literal">sysseek</tt>, and <tt class="literal">O_CREAT</tt> and <tt class="literal">O_EXCL</tt>for <tt class="literal">sysopen</tt>.  Supported import tags include "<tt class="literal">:flock</tt>" to accessthe <tt class="literal">LOCK_EX</tt>, <tt class="literal">LOCK_NB</tt>, <tt class="literal">LOCK_SH</tt>, and <tt class="literal">LOCK_UN</tt> constants for<tt class="literal">flock</tt>; "<tt class="literal">:mode</tt>" to get at constants from <em class="emphasis">sys/stat.h</em> like<tt class="literal">S_IRUSR</tt> and <tt class="literal">S_ISFIFO</tt>; "<tt class="literal">:seek</tt>" to get at the three argumentsfor <tt class="literal">seek</tt> and <tt class="literal">sysseek</tt>; and "<tt class="literal">:Fcompat</tt>" to get the old-stylesymbols with a leading "<tt class="literal">F</tt>" but not "<tt class="literal">F_</tt>", like <tt class="literal">FAPPEND</tt>,<tt class="literal">FASYNC</tt>, and <tt class="literal">FNONBLOCK</tt>.  See the online documentation for the<tt class="literal">Fcntl</tt> module and your operating system's documentation on therelevant syscalls, like <em class="emphasis">fcntl</em>(2), <em class="emphasis">lseek</em>(2), <em class="emphasis">open</em>(2), and<em class="emphasis">stat</em>(2).</p><!-- BOTTOM NAV BAR --><hr width="515" align="left"><div class="navbar"><table width="515" border="0"><tr><td align="left" valign="top" width="172"><a href="ch32_16.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0"></a></td><td align="center" valign="top" width="171"><a href="index.htm"><img src="../gifs/txthome.gif" alt="Home" border="0"></a></td><td align="right" valign="top" width="172"><a href="ch32_18.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0"></a></td></tr><tr><td align="left" valign="top" width="172">32.16. Fatal</td><td align="center" valign="top" width="171"><a href="index/index.htm"><img src="../gifs/index.gif" alt="Book Index" border="0"></a></td><td align="right" valign="top" width="172">32.18. File::Basename</td></tr></table></div><hr width="515" align="left"><!-- LIBRARY NAV BAR --><img src="../gifs/smnavbar.gif" usemap="#library-map" border="0" alt="Library Navigation Links"><p><font size="-1"><a href="copyrght.htm">Copyright &copy; 2001</a> O'Reilly &amp; Associates. All rights reserved.</font></p><map name="library-map"> <area shape="rect" coords="2,-1,79,99" href="../index.htm"><area shape="rect" coords="84,1,157,108" href="../perlnut/index.htm"><area shape="rect" coords="162,2,248,125" href="../prog/index.htm"><area shape="rect" coords="253,2,326,130" href="../advprog/index.htm"><area shape="rect" coords="332,1,407,112" href="../cookbook/index.htm"><area shape="rect" coords="414,2,523,103" href="../sysadmin/index.htm"></map><!-- END OF BODY --></body></html>
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