Prevent irritating SNDBRKMSG messages to *ALLWS

Let's face it; we're all out straight most of the time. There's no need to tear your hair out trying to dodge the break messages that keep interrupting your screen. Here's a way of preventing this long-standing frustration.

The solution, in a nutshell, is to create a Validity Checking program for the SNDBRKMSG command. This program will verify if the message-queue parameter specified has been specified as *ALLWS (while sending a message). If so, it will not allow the message to be sent. Thus, a user can send a break message only to a single workstation at a time. For convenience, a copy of the original command can be maintained in a separate library. This copy, which is allowed *ALLWS parameter, can be used only by the system operator/administrator to broadcast critical messages.

Program:  BRKVLDC


/* Length of all parameters - except T2 (Workstation MSGQ) - is immaterial

PGM PARM(&T1 &T2 &T3 &T4 &T5)


             DCL        VAR(&T1) TYPE(*CHAR) LEN(1)

             DCL        VAR(&T2) TYPE(*CHAR) LEN(20) /* MSGQ + Lib-name */

             DCL        VAR(&T3) TYPE(*CHAR) LEN(1)

             DCL        VAR(&T4) TYPE(*CHAR) LEN(1)

             DCL        VAR(&T5) TYPE(*CHAR) LEN(1)

             DCL        VAR(&T2SUB) TYPE(*CHAR) LEN(10)



    /* Actual WS-MSGQ name starts from the 3rd char.  */

    /* 1st 2 character contains the number of entries on this parameter */


             CHGVAR     VAR(&T2SUB) VALUE(%SST(&T2 3 10))


      /* If entry = *ALLWS, 'Escape' disallow message-sending */


              IF         COND(&T2SUB *EQ '*ALLWS') THEN(DO)




         GOTO END




    END:     ENDPGM

Compile above program. Attach it to SNDBRKMSG command:


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This was first published in January 2004

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