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220 lines
9.4 KiB
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<title>Preparing to Use the Virtual Terminal APIs</title>
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<a name="Top_Of_Page"></a>
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<h2>Preparing to Use the Virtual Terminal APIs</h2>
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<p>The following steps are required to prepare your iSeries<SUP>(TM)</SUP> to run an
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application using the virtual terminal APIs:</p>
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<ol type="1">
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<li>Set the number of automatically created virtual terminals using the
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Automatic virtual device configuration indicator (QAUTOVRT) system value</li>
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<li>Set the Limit security officer device access
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<a href="#QLMTSECOFR">(QLMTSECOFR)</a> system value</li>
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<li>Create user profiles using the Create User Profile
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<a href="#CRTUSRPRF">(CRTUSRPRF)</a> command</li>
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</ol>
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<br>
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<h3><a name="QAUTOVRT">Step 1: Setting the Number of Automatically Created
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Virtual Terminals</a></h3>
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<p>The i5/OS<SUP>(TM)</SUP> licensed program uses virtual terminals to allow a server program
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to interact with its client by sending and receiving data with iSeries
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applications. The i5/OS operating system will automatically select (and create
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if necessary) these virtual terminals for you.</p>
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<p>The QAUTOVRT system value specifies the maximum number of terminals that
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will be automatically configured by the system. When you set the QAUTOVRT
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system value, the i5/OS licensed program automatically configures the required
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virtual controllers and terminals. Controllers coordinate and control the
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operation of one or more input/output terminals (such as work stations) and
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synchronize the operation of such terminals with the operation of the entire
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system. Use the Change System Value (CHGSYSVAL) command to change the value of
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the QAUTOVRT system value. For example, entering the following command string
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changes the number of virtual terminals that can be allocated on a system to
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50:</p>
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<pre>
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CHGSYSVAL SYSVAL(QAUTOVRT) VALUE(50)
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</pre>
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<p>To determine and set the maximum number of users you want signed on to the
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iSeries system at any time, do the following:</p>
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<ul>
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<li>Set the QAUTOVRT system value to *NOMAX, the maximum value allowed.</li>
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<li>Have your users use the iSeries system until you decide that the number of
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virtual terminals created is sufficient for normal system operation.</li>
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<li>Use the Work with Configuration Status (WRKCFGSTS) command to determine the
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number of work stations configured.</li>
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<li>Change the QAUTOVRT system value from *NOMAX to the number of virtual
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terminals you require for normal operation.</li>
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</ul>
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<p>If you have never allowed virtual terminals to be configured automatically
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on your system, the QAUTOVRT system value is 0. As a result, you cannot use the
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virtual terminal APIs because the i5/OS licensed program is not able to create
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more work stations than the number specified. If you change the QAUTOVRT system
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value to 10, the next virtual terminal path opened causes the i5/OS licensed
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program to create a virtual terminal. This virtual terminal is created because
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the number of virtual terminals on the controller (0) is less than the number
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specified in the QAUTOVRT system value (10). Even if you change the specified
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number to 0 again, the next virtual terminal opened may succeed if a virtual
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terminal exists that is not being used.</p>
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<p>If a virtual terminal does not exist or is in use, the i5/OS licensed
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program does not create a new virtual terminal because the number of virtual
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terminals currently existing is greater than or equal to the specified QAUTOVRT
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system value. When the number of virtual terminals that currently exist is
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greater than or equal to the QAUTOVRT system value, the message CPF8940,
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"Cannot automatically select virtual device", is sent to the system operator
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message queue (QSYSOPR). You must either try again when a virtual terminal
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description becomes available or increase the QAUTOVRT system value.</p>
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<p>The i5/OS operating system uses the following conventions for naming
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virtual controllers and work stations:</p>
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<ul>
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<li>Virtual controllers named QPACTL<em>nn</em> are used for auto-created
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virtual terminal descriptions.</li>
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<li>Virtual controllers named QVIRCD<em>nnnn</em> are used for named virtual
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terminal descriptions.</li>
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<li>Virtual terminal descriptions named QPADEV<em>xxxx</em> are auto-created
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devices.</li>
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<li>Named virtual terminal devices may be requested using the virtual terminal
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APIs. An example of a named virtual terminal device would be NEWYORK001.</li>
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</ul>
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<p>Consider the following when you allow the i5/OS licensed program to
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automatically configure work stations:</p>
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<ul>
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<li>The i5/OS licensed program does not delete virtual terminals, even when
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the number of work stations attached to virtual controllers exceeds the limit
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set by QAUTOVRT.
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<p>If you want the extra work stations deleted, you must manually delete
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them.</p>
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</li>
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<li>The i5/OS licensed program allows a maximum of 254 virtual terminals on
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the QPACTL01 controller before it creates QPACTL02. This value is usually
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adequate. If you delete work stations to enforce a smaller value for the
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QAUTOVRT limit, begin by deleting the work stations from the controller with
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the highest numeric value in its name (where <em>nn</em> in the
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QPACTL<em>nn</em> name is largest).
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<p><strong>Note:</strong> Changing this system value affects other iSeries
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products and programs requiring automatic configuration. This includes TCP/IP
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TELNET, 5250 display station pass-through, and any other programs using the
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virtual terminal APIs.</p>
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</li>
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</ul>
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<br>
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<h3><a name="QLMTSECOFR">Step 2: Setting the Limit Security Officer
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(QLMTSECOFR) Value</a></h3>
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<p>The Limit security officer device access (QLMTSECOFR) system value, limits
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the devices the security officer can sign on to. The security officer controls
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all of the security authorizations provided by the iSeries system. If the
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QLMTSECOFR value is greater than zero, the security officer must be authorized
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to use the virtual device descriptions. When this value equals 0, however, the
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system does not limit the devices the security officer can use to sign on the
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system.</p>
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<p>When the system security level (QSECURITY) system value is set to 30, a
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security officer with all object authority (*ALLOBJ) must be authorized to use
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the work stations. For example, for each display station that a security
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officer wants to sign on to (local, remote, or virtual), the user must
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authorize the security officer using the following Grant Object Authority
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(GRTOBJAUT) command:</p>
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<pre>
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GRTOBJAUT OBJ(display-name) OBJTYPE(*DEVD) AUT(*CHANGE) USER(QSECOFR)
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</pre>
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<p>This procedure is very important because using the virtual terminal APIs
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automatically configures virtual terminals (devices). Automatic configuration
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is a function that names and creates the descriptions of network devices and
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controllers attached to a line. If the QLMTSECOFR value is set to 0, all
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virtual terminals automatically configured when you use the virtual terminal
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APIs can be used by the security officer. If you set the QLMTSECOFR value to 1,
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your security officer is not able to use the virtual terminals unless you
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specifically grant object authority to the security officer for that virtual
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terminal. The automatic configuration support can delete and re-create the
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virtual terminal. If this occurs, authority must be granted to the security
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officer each time the virtual terminal is created.</p>
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<h4><a name="HDRSIGNATT">Security Considerations</a></h4>
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<p>The number of sign-on attempts allowed increases if virtual terminals are
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automatically configured. The number of sign-on attempts is equal to the number
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of system sign-on attempts allowed multiplied by the number of virtual
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terminals that can be created. The number of system sign-on attempts allowed is
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defined by the QMAXSIGN system value. The number of virtual terminals that can
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be created is defined by the QAUTOVRT system value.</p>
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<br>
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<h3><a name="CRTUSRPRF">Step 3: Creating User Profiles</a></h3>
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<p>You should create one or more user profiles on the iSeries system for users
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of the virtual terminal supported by the client and server programs. The
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default user profile is *SYS. The following example shows a sample user
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profile:</p>
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<pre>
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CRTUSRPRF USRPRF(CLERK1) PASSWORD(unique-password)
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JOBD(CLERKLIB/CLERKL1)
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TEXT('User profile for one group of clerks')
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</pre>
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<br>
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<hr>
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<table align="center" cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center">
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<a href="#Top_Of_Page">Top</a> |
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<a href="vt1a.htm">Virtual Terminal APIs</a> |
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<a href="aplist.htm">APIs by category</a></td>
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</tr>
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</table>
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</body>
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</html>
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