20
Sat, Jul
2 New Articles

How to Use CL Sign-on Programs

CL
Typography
  • Smaller Small Medium Big Bigger
  • Default Helvetica Segoe Georgia Times

Ted Holt shows you how to code an IBM i program that performs start-up tasks when a user signs on to the system

Editor’s note: This article is excerpted from chapter 15 of Complete CL: Sixth Edition, by Ted Holt.

So-called sign-on programs (more accurately called initial programs) are special programs that run when a user signs on to the system. The sign-on program is indicated in the user profile’s initial program (INLPGM) attribute. With INLPGM (*NONE) in a user’s profile, the system doesn’t run any program at sign-on and shows the initial menu immediately. If the user has a value other than *NONE in the INLPGM attribute, the system runs the indicated program before it presents the initial menu. With INLMNU(*SIGNOFF) in a user’s profile, the user is signed off, when the user’s sign-on program ends.

You can write sign-on programs in any language, but they are commonly written in CL because they usually need to manipulate objects, set user environments, and interact with the system. This chapter presents a typical sign-on program that you can tailor to your own requirements. Note: Sign-on programs cannot have any parameters.

Sample Sign-On Program

The sign-on program shown in Figure 1 is an illustration only. You should customize it to your own needs by removing or adding sections. Instead of showing the entire program in one continuous listing, you will see text inserted when an explanation is necessary. The following sections include some excerpts from the sample program; you can find the complete sign-on program in Complete CL: Sixth Edition.

PGM

   DCL &dlvry     *CHAR   10

   DCL &dspname   *CHAR   10

   DCL &grpprf     *CHAR   10

   DCL &msg       *CHAR   80

   DCL &msgq       *CHAR   10

   DCL &msgqlib   *CHAR   10

   DCL &pgmrlib   *CHAR   10

   DCL &position   *DEC     3

   DCL &programmer *LGL     1

   DCL &usrcls     *CHAR   10

   DCL &usrname   *CHAR   50

   DCL &usrprf     *CHAR   10

   DCL &usrtxt     *CHAR   50

Figure 1: An example of a generic sign-on program

The program shown in Figure 1 can generate many *ESCAPE messages. Because none of the *ESCAPE messages should interrupt the program, you should ignore them all. Figure 2 shows the MONMSG command to do this.

MONMSG cpf0000

Figure 2: The MONMSG command to ignore all error messages

First, retrieve some of the attributes of the user profile with the RTVUSRPRF (Retrieve User Profile) command, and the name of the display station with the RTVJOBA (Retrieve Job Attributes) command (shown in Figure 3). This information is necessary in later parts of the program.

/* Retrieve the user profile attributes */

   RTVUSRPRF *CURRENT RTNUSRPRF(&usrprf) GRPPRF(&grpprf) +

             MSGQ(&msgq) MSGQLIB(&msgqlib) +

             TEXT(&usrtxt) USRCLS(&usrcls) DLVRY(&dlvry)

   RTVJOBA JOB(&dspnam)

Figure 3: Retrieving attributes from the user profile and name of the display station

In the job where this sign-on program is used, the security administrator uses the user profile’s text description (retrieved with RTVUSRPRF to &usrtxt) to store important user information. The text description always begins with the user’s complete name, followed by a colon (:) and the name of the department in which the user works.

You can also have the system send a status message (to line 24) saying “Signing on John Smith” (or other names) when a user signs on. To do this, you must extract the complete name from the user profile’s text description. The complete name is everything contained up to, but excluding, the colon.

You can use QCLSCAN to look for this colon. If QCLSCAN finds the colon, its exact position is reported to variable &position, which was declared as *DEC 3.

If the position is greater than zero (colon found), the user name is everything prior to it. Therefore, subtract one from &position and then use the %SST function to extract the user’s full name from &usrtxt. Otherwise, you can conclude that the security administrator forgot to place the colon in the text description, and you can presume that the text description contains nothing but the user’s full name.

Either way, variable &usrname contains the user’s full name. Now you can use the SNDPGMMSG (Send Program Message) command to present the *STATUS message. In order to show, it must go to *EXT. Note that message CPF9898 is used (which already contains an ending period in its definition). In the MSGDTA parameter, you place “Signing on” concatenated with the user name, the word “at,” the display station name, and two periods. These two periods, combined with the built-in period of CPF9898, make up an ellipsis (...), and the message appears as “Signing on John Smith at SYSDSP01...” This code is shown in Figure 4.

/* Display "Signing on..." message */

   CHGVAR &position   %SCAN(':' &usrtxt)


   IF (&position *GT 0) DO

     CHGVAR &position (&position - 1)

     CHGVAR &usrname %SST(&usrtxt 1 &position)

   ENDDO

   ELSE DO

     CHGVAR &usrname &usrtxt

   ENDDO


   SNDPGMMSG MSGID(cpf9898) MSGF(qcpfmsg) +

             MSGDTA('Signing on' *BCAT &usrname *BCAT 'at' +

                   &dspname *TCAT '..') +

             TOPGMQ(*EXT) MSGTYPE(*STATUS)

Figure 4: Displaying a message with username and display station

Suppose users in your Accounting department have display sessions named ACGDSPNN, where NN is a two-digit number, and they all have PC printers configured as IBM i printers connected to them. These emulated printers are named ACGDSPNNP1.

The code shown in Figure 5 makes it possible for your Accounting department users to print everything they request, at their PC printers, reformatted so that 132 columns can be printed on letter-size paper in portrait mode and placed on hold.

/* If signing on with Client Access, override printer files */

   IF (%SST(&dspname 1 6) *EQ 'ACGDSP') DO

     OVRPRTF *PRTF DEV(&dspname *TCAT 'P1') +

             PAGESIZE(82 132) LPI(8) CPI(16.7) OVRFLW(80) +

             FOLD(*NO) PAGRTT(0) OUTQ(*DEV) HOLD(*YES)

   ENDDO

Figure 5: Setting up override printer and attributes for a group of users

TED HOLT

Ted Holt is IT manager of Manufacturing Systems Development for Day-Brite Capri Omega, a manufacturer of lighting fixtures in Tupelo, Mississippi. He has worked in the information processing industry since 1981 and is the author or co-author of seven books. 


MC Press books written by Ted Holt available now on the MC Press Bookstore.

Complete CL: Fifth Edition Complete CL: Fifth Edition
Become a CL guru and fully leverage the abilities of your system.
List Price $79.95

Now On Sale

Complete CL: Sixth Edition Complete CL: Sixth Edition
Now fully updated! Get the master guide to Control Language programming.
List Price $79.95

Now On Sale

IBM i5/iSeries Primer IBM i5/iSeries Primer
Check out the ultimate resource and “must-have” guide for every professional working with the i5/iSeries.
List Price $99.95

Now On Sale

Qshell for iSeries Qshell for iSeries
Check out this Unix-style shell and utilities command interface for OS/400.
List Price $79.95

Now On Sale

BLOG COMMENTS POWERED BY DISQUS

LATEST COMMENTS

Support MC Press Online

$

Book Reviews

Resource Center

  • SB Profound WC 5536 Have you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application. You can find Part 1 here. In Part 2 of our free Node.js Webinar Series, Brian May teaches you the different tooling options available for writing code, debugging, and using Git for version control. Brian will briefly discuss the different tools available, and demonstrate his preferred setup for Node development on IBM i or any platform. Attend this webinar to learn:

  • SB Profound WP 5539More than ever, there is a demand for IT to deliver innovation. Your IBM i has been an essential part of your business operations for years. However, your organization may struggle to maintain the current system and implement new projects. The thousands of customers we've worked with and surveyed state that expectations regarding the digital footprint and vision of the company are not aligned with the current IT environment.

  • SB HelpSystems ROBOT Generic IBM announced the E1080 servers using the latest Power10 processor in September 2021. The most powerful processor from IBM to date, Power10 is designed to handle the demands of doing business in today’s high-tech atmosphere, including running cloud applications, supporting big data, and managing AI workloads. But what does Power10 mean for your data center? In this recorded webinar, IBMers Dan Sundt and Dylan Boday join IBM Power Champion Tom Huntington for a discussion on why Power10 technology is the right strategic investment if you run IBM i, AIX, or Linux. In this action-packed hour, Tom will share trends from the IBM i and AIX user communities while Dan and Dylan dive into the tech specs for key hardware, including:

  • Magic MarkTRY the one package that solves all your document design and printing challenges on all your platforms. Produce bar code labels, electronic forms, ad hoc reports, and RFID tags – without programming! MarkMagic is the only document design and print solution that combines report writing, WYSIWYG label and forms design, and conditional printing in one integrated product. Make sure your data survives when catastrophe hits. Request your trial now!  Request Now.

  • SB HelpSystems ROBOT GenericForms of ransomware has been around for over 30 years, and with more and more organizations suffering attacks each year, it continues to endure. What has made ransomware such a durable threat and what is the best way to combat it? In order to prevent ransomware, organizations must first understand how it works.

  • SB HelpSystems ROBOT GenericIT security is a top priority for businesses around the world, but most IBM i pros don’t know where to begin—and most cybersecurity experts don’t know IBM i. In this session, Robin Tatam explores the business impact of lax IBM i security, the top vulnerabilities putting IBM i at risk, and the steps you can take to protect your organization. If you’re looking to avoid unexpected downtime or corrupted data, you don’t want to miss this session.

  • SB HelpSystems ROBOT GenericCan you trust all of your users all of the time? A typical end user receives 16 malicious emails each month, but only 17 percent of these phishing campaigns are reported to IT. Once an attack is underway, most organizations won’t discover the breach until six months later. A staggering amount of damage can occur in that time. Despite these risks, 93 percent of organizations are leaving their IBM i systems vulnerable to cybercrime. In this on-demand webinar, IBM i security experts Robin Tatam and Sandi Moore will reveal:

  • FORTRA Disaster protection is vital to every business. Yet, it often consists of patched together procedures that are prone to error. From automatic backups to data encryption to media management, Robot automates the routine (yet often complex) tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:

  • FORTRAManaging messages on your IBM i can be more than a full-time job if you have to do it manually. Messages need a response and resources must be monitored—often over multiple systems and across platforms. How can you be sure you won’t miss important system events? Automate your message center with the Robot Message Management Solution. Key features include:

  • FORTRAThe thought of printing, distributing, and storing iSeries reports manually may reduce you to tears. Paper and labor costs associated with report generation can spiral out of control. Mountains of paper threaten to swamp your files. Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing. Manage your reports with the Robot Report Management Solution. Key features include:

  • FORTRAFor over 30 years, Robot has been a leader in systems management for IBM i. With batch job creation and scheduling at its core, the Robot Job Scheduling Solution reduces the opportunity for human error and helps you maintain service levels, automating even the biggest, most complex runbooks. Manage your job schedule with the Robot Job Scheduling Solution. Key features include:

  • LANSA Business users want new applications now. Market and regulatory pressures require faster application updates and delivery into production. Your IBM i developers may be approaching retirement, and you see no sure way to fill their positions with experienced developers. In addition, you may be caught between maintaining your existing applications and the uncertainty of moving to something new.

  • LANSAWhen it comes to creating your business applications, there are hundreds of coding platforms and programming languages to choose from. These options range from very complex traditional programming languages to Low-Code platforms where sometimes no traditional coding experience is needed. Download our whitepaper, The Power of Writing Code in a Low-Code Solution, and:

  • LANSASupply Chain is becoming increasingly complex and unpredictable. From raw materials for manufacturing to food supply chains, the journey from source to production to delivery to consumers is marred with inefficiencies, manual processes, shortages, recalls, counterfeits, and scandals. In this webinar, we discuss how:

  • The MC Resource Centers bring you the widest selection of white papers, trial software, and on-demand webcasts for you to choose from. >> Review the list of White Papers, Trial Software or On-Demand Webcast at the MC Press Resource Center. >> Add the items to yru Cart and complet he checkout process and submit

  • Profound Logic Have you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application.

  • SB Profound WC 5536Join us for this hour-long webcast that will explore:

  • Fortra IT managers hoping to find new IBM i talent are discovering that the pool of experienced RPG programmers and operators or administrators with intimate knowledge of the operating system and the applications that run on it is small. This begs the question: How will you manage the platform that supports such a big part of your business? This guide offers strategies and software suggestions to help you plan IT staffing and resources and smooth the transition after your AS/400 talent retires. Read on to learn: