12 lines
2.6 KiB
HTML
12 lines
2.6 KiB
HTML
<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>out-of-band</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="../O.html" title="O"/><link rel="previous" href="OTOH.html" title="OTOH"/><link rel="next" href="overclock.html" title="overclock"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">out-of-band</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="OTOH.html">Prev</a> </td><th width="60%" align="center">O</th><td width="20%" align="right"> <a accesskey="n" href="overclock.html">Next</a></td></tr></table><hr/></div><dt><a id="out-of-band"/><dt xmlns="" id="out-of-band"><b>out-of-band</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">adj.</span></dt></dt><dd><p> [from telecommunications and network theory] </p></dd><dd><p> 1. In software, describes values of a function which are not in its
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‘natural’ range of return values, but are rather signals that
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some kind of exception has occurred. Many C functions, for example, return
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a nonnegative integral value, but indicate failure with an out-of-band
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return value of −1. Compare <a href="../H/hidden-flag.html"><i class="glossterm">hidden flag</i></a>,
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<a href="../G/green-bytes.html"><i class="glossterm">green bytes</i></a>, <a href="../F/fence.html"><i class="glossterm">fence</i></a>. </p></dd><dd><p> 2. Also sometimes used to describe what communications people call
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<span class="firstterm">shift characters</span>, such as the ESC
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that leads control sequences for many terminals, or the level shift
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indicators in the old 5-bit Baudot codes. </p></dd><dd><p> 3. In personal communication, using methods other than email, such
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as telephones or <a href="../S/snail-mail.html"><i class="glossterm">snail-mail</i></a>.</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="OTOH.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="../O.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="overclock.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">OTOH </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> overclock</td></tr></table></div></body></html>
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