April 1, 1981 GENIMAGE creates or modifies text files on a CKS disk. These text
files contain the images to be used by the 3800 Printing Subsystem. IKAGELIB loads the new or changed text files created by GENIKAGE into
virtual storage. When all the files are loaded, DIAGNOSE Code X'74' is
invoked to save these files as a named system. See Y]iL170 Pl§..illli!!g System Guide or more information
on IMAGELIB and GENIMAGE. STORING AND LOADING CONTROL TABLES As part of VM/370 support of the 3800 printer, character arrangement
tables, copy modifications, graphic modifications, and FCBs are stored
in a named system. PrioI:' to printing a spool file, the VK/370 operator specifies a named
system on the IMAGE parameter of the START command. The control tables
specified for the file (via the SPOOL and CHANGE commands) are loaded
into the 3800 from that named system and the file is printed.
The NAME3800 macro instruction establishes the named system at system
generation. See the further information. RECOVERING FROM I/O ERRORS Because the actual printing of lines on the page is slower than the
output of lines from the processor, spool files are placed into a
delayed purge queue to await printing by the 3800. Only when the
maximum number of files are in the queue will the first one actually be
purged. The size of the queue can be specified at sysgen via the DPMSIZE parameter on the RDEVICE macro instruction. DPMSIZE can have a
maximum value of nine.
Because spool files are queued, the BACKSPAC command may be used for the 3800 printer to restore pages that are lost when an I/O error
occurs. In addition, the operator may specify the EOF parameter, which
indicates that backspacing should begin at the end of the file and
continue for the number of pages specified. See the for more information on the BACKSPAC command. DISPLAYING PRINTER CONTROL INFORMATION The QUERY command enables G-, B-, and D-privilege users to display the
names of the character arrangement table, copy modification, and FeB
currently in effect for a spool file or a virtual printer. In addition,
the VM/370 operator can use the QUERY command to determine the image
library used and the forms loaded on a real 3800. See the Guide for details on the QUERY command.
228 IBM VM/370 System programmer's Guide

J ou·rna ling LOGO N, AUTO LOG, and LI N
K
Commands LOGON, AUTOLOG, and LINK Journaling attempts to detect and record
certain occurrences of the LOGON, AUTOLOG, or LINK commands. using the
recorded information, an installation may be able to identify attempts
to logon to VM/370 by users that issue invalid passwords. Also, the
installation may be able to identify users that successfully issue the
LINK command to protected minidisks not owned by that user.
Briefly, LOGON, AUTOLOG, and LINK journaling works like this. While
journaling is turned on, CP monitors all occurrences of the LOGON, AUTOLOG, and LINK commands. CP keeps count of the number of times a
user issues one of these commands with an invalid password. When this
count exceeds an installation defined threshold value, CP optionally: I • Writes a record to the accounting data set to record the incident I • Rejects subsequent LOGON, AUTOLOG, or LINK commands issued by the I user I • Sends a message to an installation-defined user identification to I alert the installation to the incident
Also, each time CP detects,that a user has successfully issued a LINK
command to a protected minidisk not owned by that user, CP optionally
records the incident by writing a record to the accounting data set. A
protected minidisk is a minidisk whose password is anything but ALL for
the type of LINK attempted.
For a description of the accounting records that CP writes for LOGON, AUTOLOG, and LINK journaling, see the section "Accounting Records."
The SYSJRL macro instruction, the SET and the QUERY command
enable an installation to control LOGON, AUTOLOG, and LINK journaling.
To make journaling available and to specify options, code the SYSJRL macro instruction in module DMKSYS. Instructions for coding this macro
instruction are in the gng To
turn journaling on or off, lise the class A SET command. To determine
whether journaling is on or off, use the class A QUERY command. Part 2. Control Program (CP) 229