114 lines
5.2 KiB
HTML
114 lines
5.2 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Pseudo-terminal" />
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<meta name="abstract" content="i5/OS PASE supports both AT&T and Berkeley Software Distributions (BSD) style devices. From a programming perspective, these devices work in i5/OS PASE in the same way that they work on AIX." />
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<meta name="description" content="i5/OS PASE supports both AT&T and Berkeley Software Distributions (BSD) style devices. From a programming perspective, these devices work in i5/OS PASE in the same way that they work on AIX." />
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<meta name="DC.Relation" scheme="URI" content="rzalfinteract.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2000, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2000, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzalfpty" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Pseudo-terminal</title>
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</head>
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<body id="rzalfpty"><a name="rzalfpty"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Pseudo-terminal</h1>
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<div><p><span class="keyword">i5/OS™</span> PASE supports
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both AT&T and Berkeley Software Distributions (BSD) style devices. From
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a programming perspective, these devices work in <span class="keyword">i5/OS</span> PASE
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in the same way that they work on AIX<sup>®</sup>.</p>
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<p><span class="keyword">i5/OS</span> PASE allows a
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maximum of 1024 instances for AT&T style devices, and a maximum of 592
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BSD style devices. When the system is started, the first 32 instances of each
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device type are created automatically.</p>
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<div class="section"><h4 class="sectiontitle">Configure PTY devices in <span class="keyword">i5/OS</span> PASE</h4><p>On AIX,
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an administrator uses <tt>smit</tt> to configure the number of available devices
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of each type. In <span class="keyword">i5/OS</span> PASE,
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these devices are configured in the following way:</p>
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<ul><li>For AT&T-style devices, <span class="keyword">i5/OS</span> PASE
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supports autoconfiguration. If the first 32 instances are in use and an application
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tries to open another instance, the CHRSF device is created in the integrated
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file system automatically, up to the limit of 1024 devices.</li>
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<li>For BSD-style devices, you must create the CHRSF devices manually, using
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the <span class="keyword">i5/OS</span> PASE <tt>mknod</tt> utility.
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To do this, you need to know the major numbers for the BSD subordinate and
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BSD primary devices as well as the naming convention. The following example
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shell script shows how to create additional BSD pseudo-terminal (PTY) devices.
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It creates them in groups of 16.<div class="note"><span class="notetitle">Note:</span> By using the code
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examples, you agree to the terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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<pre>#!/QOpenSys/usr/bin/ksh
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prefix="pqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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bsd_tty_major=32949
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bsd_pty_major=32948
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if [ $# -lt 1 ]
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then
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echo "usage: $(basename $0) ptyN "
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exit 10
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fi
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function mkdev {
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if [ ! -e $1 ]
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then
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mknod $1 c $2 $3
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chown QSYS $1
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chmod 0666 $1
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fi
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}
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while [ "$1" ]
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do
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N=${1##pty}
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if [ "$N" = "$1" -o "$N" = "" -o $N -lt 0 -o $N -gt 36 ]
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then
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echo "skipping: \"$1\": not valid, must be in the form ptyN where: 0 <= N <= 36"
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shift
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continue
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fi
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minor=$((N * 16))
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pre=$(expr "$prefix" : ".\{$N\}\(.\)")
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echo "creating /dev/[pt]ty${pre}0 - /dev/[pt]ty${pre}f"
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for i in 0 1 2 3 4 5 6 7 8 9 a b c d e f
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do
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echo ".\c"
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mkdev /dev/pty${pre}${i} $bsd_pty_major $minor
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echo ".\c"
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mkdev /dev/tty${pre}${i} $bsd_tty_major $minor
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minor=$((minor + 1))
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done
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echo ""
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shift
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done
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</pre>
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</li>
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</ul>
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<p>For more information about PTY devices, see the <a href="http://www.ibm.com/servers/aix/library/" target="_blank">AIX documentation</a> Web
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site.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzalfinteract.htm" title="As you customize your i5/OS PASE programs to use i5/OS functions, you need to consider the ways in which your program will interact with them.">How i5/OS PASE programs interact with i5/OS</a></div>
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</div>
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</div>
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</body>
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</html>
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