Chris -
Thanks a lot!
The confusing thing here is about a new customer coming in. We are trying
to figure out how automation
and monitoring network connections are handled. A colleague claims that
OPS/MVS is PPO.
I did exactly what you suggest and made a search in VTAMLST for 'PPO' and
found only one node
with AUTH=PPO - it was Netmaster and it is definitely not active and
Netmaster does not use it.
I'm not an OP/MVS guy so I feared that there could be some tricky
interfaces buildt in, which could
grap unsolicited messages.
I've skimmed the OPS-rules and dont find anything which could indicate
action on unsolicited messages
but I'm still in doubt!
Thanks again -
Venlig hilsen / Best regards
TONNI OTTOSEN
Senior Consultant
CSC
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From: Chris Mason <chrisma...@belgacom.net>
To: IBM-MAIN@bama.ua.edu
Date: 22-10-2010 14:47
Subject: Re: PPO
Tonni
> Can an application be PPO without an open ACB with AUTH=PPO i. e.
OPS/MVS?
No.
>From the description of the AUTH operand in the z/OS Communications Server
Resource Definition Reference manual:
<quote>
AUTH=(NOACQ,NOASDP,NOCNM,NOPASS,NOPO,NOTSO,VPACE)
...
AUTH=PPO
AUTH=SPO
AUTH=NOPO
Specifies whether the application program can issue VTAM operator commands
and receive responses and unsolicited messages. z/OS Communications
Server: SNA Programming describes the program operator application.
If you code either the primary program operator (PPO) or the secondary
program operator (SPO), the application program is authorized to issue
SENDCMD and RCVCMD macroinstructions.
If you code PPO, the application program receives all unsolicited messages,
that is, all informational and error messages that are not replies to
operator
commands. If no PPO-designated application program is active when these
messages occur, they are directed to the system console.
</quote>
Note that AUTH=NOPO is default as shown in the first line.
> What happens if two applications competes to become PPO?
Since AUTH=PPO is all about a VTAM API we search in the appropriate manual
[1] and find in section "Defining a program operator" in Appendix L,
"Program
operator coding requirements" in the z/OS Communications Server SNA
Programming manual:
<quote>
Only one primary program operator can be active at a time; however, one or
more secondary program operators can also be active.
</quote>
Since it is forbidden that two programs with AUTH=PPO can be active, again
we search in the appropriate manual and find in section "OPEN
macroinstruction error fields" in "ACB OPEN and CLOSE macroinstruction
error
fields" in Chapter 2, "Return codes for VTAM macroinstructions" in the z/OS
Communications Server IP and SNA Codes manual:
<quote>
104 (X'68')
The APPLID field in the ACB identifies an application program that is
defined
with AUTH=PPO in its APPL definition statement. Another program with the
same authorization is active. Only one program defined with AUTH=PPO can be
active at a time.
</quote>
> How can I determine who is PPO?
I'm afraid I'm unaware of a specific command which can be entered which
actually identifies which program currently holds the PPO baton, as it
were,
and searching for "PPO" in the appropriate manual, z/OS Communications
Server SNA Operation, doesn't show anything.
What you could do - rather laboriously - is scan all - likely - active
applications which are active in VTAM and check the APPL statement for
AUTH=(...,PPO,...).
Perhaps you should post again explaining what your "confusing situation"
is.
Chris Mason
[1] Long, long ago in the late '70s, this API actually had its own rather
slim
manual!
On Fri, 22 Oct 2010 13:21:57 +0200, Tonni J Ottosen <totto...@csc.com>
wrote:
>Hi -
>
>I have a confusing situation which causes me to ask some questions about
>PPO (Primary Program Operator).
>
>How can I determine who is PPO?
>
>Can an application be PPO without an open ACB with AUTH=PPO i. e.
OPS/MVS?
>
>What happens if two applications competes to become PPO?
>
>Thanks -
>
>Venlig hilsen / Best regards
>
>TONNI OTTOSEN
>Senior Consultant
>CSC
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