11 lines
2.1 KiB
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11 lines
2.1 KiB
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<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>hole</title><link rel="stylesheet" href="../../jargon.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.61.0"/><link rel="home" href="../index.html" title="The Jargon File"/><link rel="up" href="../H.html" title="H"/><link rel="previous" href="hog.html" title="hog"/><link rel="next" href="hollised.html" title="hollised"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">hole</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="hog.html">Prev</a><EFBFBD></td><th width="60%" align="center">H</th><td width="20%" align="right"><EFBFBD><a accesskey="n" href="hollised.html">Next</a></td></tr></table><hr/></div><dt><a id="hole"/><dt xmlns="" id="hole"><b>hole</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">n.</span></dt></dt><dd><p> A region in an otherwise <a href="../F/flat.html"><i class="glossterm">flat</i></a> entity which is
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not actually present. For example, some Unix filesystems can store large
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files with holes so that unused regions of the file are never actually
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stored on disk. (In techspeak, these are referred to as
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‘sparse’ files.) As another example, the region of memory in
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IBM PCs reserved for memory-mapped I/O devices which may not actually be
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present is called ‘the I/O hole’, since memory-management
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systems must skip over this area when filling user requests for
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memory.</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="hog.html">Prev</a><EFBFBD></td><td width="20%" align="center"><a accesskey="u" href="../H.html">Up</a></td><td width="40%" align="right"><EFBFBD><a accesskey="n" href="hollised.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">hog<EFBFBD></td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"><EFBFBD>hollised</td></tr></table></div></body></html>
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