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rlgwebd.js: prevent races when reading ttyrecs. DglSession objects read a 12-byte TTYREC header, extract therefrom the length of the data chunk, and then read the data. In between these two reads, the file watcher could trigger another readchunk() invocation, which might attempt to read a header from the beginning of the data chunk. This usually results in expecting a data chunk of several GB and failing to create a Buffer for it. The race is remedied by setting a flag on the DglSession object whenever readchunk() is called, clearing it when both reads complete, and refusing to read if it is already set.
author John "Elwin" Edwards
date Wed, 07 Jan 2015 13:18:35 -0500
parents 3308eaa00c91
children
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>WebTTY</title>
<script type="text/javascript" src="termemu.js"></script>
<script type="text/javascript" src="termemu-keys.js"></script>
<script type="text/javascript" src="shterm.js"></script>
<link rel="stylesheet" type="text/css" href="tty.css">
</head>
<body onload="setup()" onkeydown="sendkey(event)">
<h1>WebTTY</h1>
<div id ="top">
  <span id="ttitle"></span>
  <img src="/bell.svg" alt="bell" id="bell">
</div>
<div id="termwrap">
Browsing with Javascript turned off?  I sympathize.  I didn't want Javascript to be necessary for WebTerm.  Unfortunately, the only other way to make it work was Java applets.
</div>
<div class="keyrow">
  <div class="key" onclick="vkey('`')">`</div>
  <div class="key" onclick="vkey('1')">1</div>
  <div class="key" onclick="vkey('2')">2</div>
  <div class="key" onclick="vkey('3')">3</div>
  <div class="key" onclick="vkey('4')">4</div>
  <div class="key" onclick="vkey('5')">5</div>
  <div class="key" onclick="vkey('6')">6</div>
  <div class="key" onclick="vkey('7')">7</div>
  <div class="key" onclick="vkey('8')">8</div>
  <div class="key" onclick="vkey('9')">9</div>
  <div class="key" onclick="vkey('0')">0</div>
  <div class="key" onclick="vkey('-')">-</div>
  <div class="key" onclick="vkey('=')">=</div>
  <div class="key" onclick="vkey('\b')" style="width: 2.5em">Bksp</div>
  <div class="rkey" onclick="vkey('KP9')">↗</div>
  <div class="rkey" onclick="vkey('KP8')">↑</div>
  <div class="rkey" onclick="vkey('KP7')">↖</div>
</div>
<div class="keyrow">
  <div class="key" onclick="vkey('\t')" style="width: 2.5em">Tab</div>
  <div class="key" onclick="vkey('q')">Q</div>
  <div class="key" onclick="vkey('w')">W</div>
  <div class="key" onclick="vkey('e')">E</div>
  <div class="key" onclick="vkey('r')">R</div>
  <div class="key" onclick="vkey('t')">T</div>
  <div class="key" onclick="vkey('y')">Y</div>
  <div class="key" onclick="vkey('u')">U</div>
  <div class="key" onclick="vkey('i')">I</div>
  <div class="key" onclick="vkey('o')">O</div>
  <div class="key" onclick="vkey('p')">P</div>
  <div class="key" onclick="vkey('[')">[</div>
  <div class="key" onclick="vkey(']')">]</div>
  <div class="key" onclick="vkey('\\')">\</div>
  <div class="rkey" onclick="vkey('KP6')">→</div>
  <div class="rkey" onclick="vkey('KP5')">·</div>
  <div class="rkey" onclick="vkey('KP4')">←</div>
</div>
<div class="keyrow">
  <div class="key" onclick="togglectrl()" id="ctrlkey">Ctrl</div>
  <div class="key" onclick="vkey('a')">A</div>
  <div class="key" onclick="vkey('s')">S</div>
  <div class="key" onclick="vkey('d')">D</div>
  <div class="key" onclick="vkey('f')">F</div>
  <div class="key" onclick="vkey('g')">G</div>
  <div class="key" onclick="vkey('h')">H</div>
  <div class="key" onclick="vkey('j')">J</div>
  <div class="key" onclick="vkey('k')">K</div>
  <div class="key" onclick="vkey('l')">L</div>
  <div class="key" onclick="vkey(';')">;</div>
  <div class="key" onclick="vkey('\'')">'</div>
  <div class="key" onclick="vkey('\n')" style="width: 4em">Ret</div>
  <div class="rkey" onclick="vkey('KP3')">↘</div>
  <div class="rkey" onclick="vkey('KP2')">↓</div>
  <div class="rkey" onclick="vkey('KP1')">↙</div>
</div>
<div class="keyrow">
  <div class="key" onclick="toggleshift()" id="shiftkey">Shift</div>
  <div class="key" onclick="vkey('z')">Z</div>
  <div class="key" onclick="vkey('x')">X</div>
  <div class="key" onclick="vkey('c')">C</div>
  <div class="key" onclick="vkey('v')">V</div>
  <div class="key" onclick="vkey('b')">B</div>
  <div class="key" onclick="vkey('n')">N</div>
  <div class="key" onclick="vkey('m')">M</div>
  <div class="key" onclick="vkey(',')">,</div>
  <div class="key" onclick="vkey('.')">.</div>
  <div class="key" onclick="vkey('/')">/</div>
</div>
<div class="keyrow">
  <div class="key" onclick="vkey(' ')" id="spacebar"></div>
</div>
<div class="rbutton" onclick="login()">Log in</div>
<div class="rbutton" onclick="stop()">Stop</div>
<div class="rbutton">Font:
<span onclick="textsize(false)">Smaller</span>
<span onclick="textsize(true)">Larger</span>
</div>
<div id="debug">
<p>Debugging Output</p>
</div>
</body>
</html>