SYS1.PARMLIB Members Related to IPCS

IPCS provides parmlib members to control IPCS processing. The BLSCECT, BLSCECTX, and BLSCUSER parmlib members define data areas, symbols, component analysis dialogs, and IBM- and installation-supplied exit routines for IPCS dump formatting and analysis. These parmlib members may also embed IBM- or installation-supplied parmlib members. Note that the data areas, exit routines, and embedded parmlib members can also be used for ABEND and SNAP dump formatting.

For SNAP formatting, IPCS procedure BLSJPRMI initializes IPCS formatting tables. During system initialization, a START command from parmlib member IEACMD00 initiates BLSJPRMI. If PARMLIB members are updated after BLSJPRMI runs, new formatting tables are built, using the current contents of PARMLIB, and the formatters are used by both IPCS and formatted dumps (such as SYSUDUMP and SYSABEND). If BLSJPRMI fails to initialize the IPCS tables for SNAP dump processing, IPCS issues message BLS001E. BLSJPRMI issues the following return codes:

Return Code: Description
0: Normal completion.
4: Attention; condition(s) occurred, but did not prevent successful completion of processing.
8: Error condition(s) occurred, but did not prevent successful completion of processing.
12: Serious conditions occurred; problems pertaining to the syntax or consistent semantic of the parmlib statements) prevented completion of some portion of processing.
16: Terminating conditions occurred; problems pertaining to the processing environment prevented completion of some portion of processing.

The IPCSPRxx members define IPCS session parameters. When starting an IPCS session, most IPCS users enter the IPCS NOPARM command to indicate that IPCS is not to use session parameters specified in the IPCSPR00 or any other IPCSPRxx parmlib member.

The parmlib members to control IPCS processing are:

BLSCECT
BLSCECT is an IBM-supplied default member of SYS1.PARMLIB. This default member embeds BLSCECTX, other IBM-supplied parmlib members, and BLSCUSER.
BLSCECTX
BLSCECTX is an IBM-supplied default member of SYS1.PARMLIB. This member specifies the format exit routines for IBM® programs not in the base system. This member also embeds other IBM-supplied parmlib members used by MVS™ components to define their IPCS support.
BLSCUSER
BLSCUSER is an optional parmlib member an installation can create and use for customization. IBM does not supply a BLSCUSER member.
IPCSPR00
The IBM-supplied default is the IPCSPR00 member in SYS1.PARMLIB. This member contains parameters for an IPCS session.
IPCSPRxx
Installations can supply one or more IPCSPRxx parmlib members to identify customized parameters to be used during IPCS sessions. These parameters let an installation tailor IPCS sessions to its requirements.

For more information about the topics in the section, see the following references:

Customizing IPCS Session Parameters for using IPCS parmlib members and alternate parmlibs to customize IPCS session parameters
CTRACE Filter/Analysis (CTRF) Exit Routine for using the PANDEF statement in a BLSCUSER parmlib member to create a component analysis dialog
Installing IPCS Exit Routines for using IPCS parmlib members to install IPCS exit routines
z/OS MVS Initialization and Tuning Reference for the BLSCECT, BLSCUSER, and IPCSPRxx members