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<div id="breadCrumbs"><a href="index.html">Home</a> > <a href="index-modules-A.html">Core modules</a> > <a href="index-modules-F.html">F</a> > FileCache</div>
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<div id="contentBody"><div class="title_container"><div class="page_title">FileCache</div></div><ul><li><a href="#NAME">NAME</a><li><a href="#SYNOPSIS">SYNOPSIS</a><li><a href="#DESCRIPTION">DESCRIPTION</a><li><a href="#CAVEATS">CAVEATS</a><li><a href="#BUGS">BUGS</a></ul><a name="NAME"></a><h1>NAME</h1>
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<p>FileCache - keep more files open than the system permits</p>
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<a name="SYNOPSIS"></a><h1>SYNOPSIS</h1>
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<pre class="verbatim"> <a class="l_k" href="functions/use.html">use</a> <a class="l_w" href="FileCache.html">FileCache</a><span class="sc">;</span>
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<span class="c"># or</span>
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<a class="l_k" href="functions/use.html">use</a> <a class="l_w" href="FileCache.html">FileCache</a> maxopen <span class="cm">=></span> <span class="n">16</span><span class="sc">;</span></pre>
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<pre class="verbatim"> cacheout <span class="i">$mode</span><span class="cm">,</span> <span class="i">$path</span><span class="sc">;</span>
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<span class="c"># or</span>
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cacheout <span class="i">$path</span><span class="sc">;</span>
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<pre class="verbatim"> <a class="l_k" href="functions/use.html">use</a> <span class="w">FileCache</span><span class="sc">;</span>
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<span class="c"># or</span>
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<a class="l_k" href="functions/use.html">use</a> <span class="w">FileCache</span> <span class="w">maxopen</span> <span class="cm">=></span> <span class="n">16</span><span class="sc">;</span></pre>
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<pre class="verbatim"> <span class="w">cacheout</span> <span class="i">$mode</span><span class="cm">,</span> <span class="i">$path</span><span class="sc">;</span>
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<span class="c"># or</span>
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<span class="w">cacheout</span> <span class="i">$path</span><span class="sc">;</span>
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<a class="l_k" href="functions/print.html">print</a> <span class="i">$path</span> <span class="i">@data</span><span class="sc">;</span></pre>
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<pre class="verbatim"> <span class="i">$fh</span> = cacheout <span class="i">$mode</span><span class="cm">,</span> <span class="i">$path</span><span class="sc">;</span>
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<pre class="verbatim"> <span class="i">$fh</span> = <span class="w">cacheout</span> <span class="i">$mode</span><span class="cm">,</span> <span class="i">$path</span><span class="sc">;</span>
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<span class="c"># or</span>
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<span class="i">$fh</span> = cacheout <span class="i">$path</span><span class="sc">;</span>
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<span class="i">$fh</span> = <span class="w">cacheout</span> <span class="i">$path</span><span class="sc">;</span>
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<a class="l_k" href="functions/print.html">print</a> <span class="i">$fh</span> <span class="i">@data</span><span class="sc">;</span></pre>
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<a name="DESCRIPTION"></a><h1>DESCRIPTION</h1>
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<p>The <code class="inline">cacheout</code>
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<p>The <code class="inline"><span class="w">cacheout</span></code>
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function will make sure that there's a filehandle open
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for reading or writing available as the pathname you give it. It
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automatically closes and re-opens files if you exceed your system's
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<a name="CAVEATS"></a><h1>CAVEATS</h1>
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<p>While it is permissible to <code class="inline"><a class="l_k" href="functions/close.html">close</a></code> a FileCache managed file,
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do not do so if you are calling <code class="inline">FileCache::cacheout</code>
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do not do so if you are calling <code class="inline"><span class="w">FileCache::cacheout</span></code>
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from a package other
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than which it was imported, or with another module which overrides <code class="inline"><a class="l_k" href="functions/close.html">close</a></code>.
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If you must, use <code class="inline">FileCache::cacheout_close</code>
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If you must, use <code class="inline"><span class="w">FileCache::cacheout_close</span></code>
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<p>Although FileCache can be used with piped opens ('-|' or '|-') doing so is
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strongly discouraged. If FileCache finds it necessary to close and then reopen
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close a file. When the file is reopened, the offset will be as specified by the
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original <code class="inline"><a class="l_k" href="functions/open.html">open</a></code> file mode. This could be construed to be a bug.</p>
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<a name="BUGS"></a><h1>BUGS</h1>
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<p><i>sys/param.h</i> lies with its <code class="inline">NOFILE</code>
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<p><i>sys/param.h</i> lies with its <code class="inline"><span class="w">NOFILE</span></code>
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define on some systems,
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so you may have to set <i>maxopen</i> yourself.</p>
added
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FileCache.html
