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            <h1>perlfreebsd</h1>


  <!--    -->
<ul><li><a href="#NAME">NAME</a><li><a href="#DESCRIPTION">DESCRIPTION</a><ul><li><a href="#FreeBSD-core-dumps-from-readdir_r-with-ithreads">FreeBSD core dumps from readdir_r with ithreads</a><li><a href="#%24%5eX-doesn't-always-contain-a-full-path-in-FreeBSD">$^X doesn't always contain a full path in FreeBSD</a></ul><li><a href="#AUTHOR">AUTHOR</a></ul><a name="NAME"></a><h1>NAME</h1>
<p>perlfreebsd - Perl version 5 on FreeBSD systems</p>
<a name="DESCRIPTION"></a><h1>DESCRIPTION</h1>
<p>This document describes various features of FreeBSD that will affect how Perl
version 5 (hereafter just Perl) is compiled and/or runs.</p>
<a name="FreeBSD-core-dumps-from-readdir_r-with-ithreads"></a><h2>FreeBSD core dumps from readdir_r with ithreads</h2>
<p>When perl is configured to use ithreads, it will use re-entrant library calls
in preference to non-re-entrant versions.  There is a bug in FreeBSD's
<code class="inline"><span class="w">readdir_r</span></code>
 function in versions 4.5 and earlier that can cause a SEGV when
reading large directories. A patch for FreeBSD libc is available
(see <a href="http://www.freebsd.org/cgi/query-pr.cgi?pr=misc/30631">http://www.freebsd.org/cgi/query-pr.cgi?pr=misc/30631</a> )
which has been integrated into FreeBSD 4.6.</p>
<a name="%24%5eX-doesn't-always-contain-a-full-path-in-FreeBSD"></a><h2><code class="inline"><span class="i">$^X</span></code>
 doesn't always contain a full path in FreeBSD</h2>
<p>perl sets <code class="inline"><span class="i">$^X</span></code>
 where possible to a full path by asking the operating
system. On FreeBSD the full path of the perl interpreter is found by using
<code class="inline"><span class="w">sysctl</span></code>
 with <code class="inline"><span class="w">KERN_PROC_PATHNAME</span></code>
 if that is supported, else by reading
the symlink <i>/proc/curproc/file</i>. FreeBSD 7 and earlier has a bug where
either approach sometimes returns an incorrect value
(see <a href="http://www.freebsd.org/cgi/query-pr.cgi?pr=35703">http://www.freebsd.org/cgi/query-pr.cgi?pr=35703</a> ).
In these cases perl will fall back to the old behaviour of using C's
<code class="inline"><span class="w">argv</span><span class="s">[</span><span class="n">0</span><span class="s">]</span></code>
 value for <code class="inline"><span class="i">$^X</span></code>
.</p>
<a name="AUTHOR"></a><h1>AUTHOR</h1>
<p>Nicholas Clark &lt;nick@ccl4.org&gt;, collating wisdom supplied by Slaven Rezic
and Tim Bunce.</p>
<p>Please report any errors, updates, or suggestions to <a href="mailto:perlbug@perl.org">mailto:perlbug@perl.org</a>.</p>




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