Considerations for specifying commands and programs

Only commands and programs that do not require the services of MVS™ task termination can run on the command/program invocation platform.

The PLATCMD statement in SYS1.SAMPLIB member IKJTSO00 contains a list of recommended commands that you can run on the command/program invocation platform. Unauthorized commands are:

ALLOCATE
ALTLIB
ATTRIB
CALL
EXEC
FREE
PRINTDS
PROFILE
STATUS
SUBMIT

Authorized commands are:

CONSPROF
LISTBC
PARMLIB
RACONVRT
RECEIVE
SEND
SYNC
TRANSMIT

The PLATPGM statement in SYS1.SAMPLIB member IKJTSO00 contains a list of recommended programs you can run on the command/program invocation platform.

IEFBR14 is an unauthorized program you can run.

IKJEFF76 is an authorized program you can run.

You can also add installation-written commands and programs to platform support statements in SYS1.PARMLIB, member IKJTSOxx. Before adding commands or programs to a platform support statement, the following must be considered:

Any task-related resources that the command or program obtains must be explicitly released during normal processing (for example, subpool 0 storage or ENQ serialization).
When a command or program that is running on the command/program invocation platform abnormally terminates or terminates due to an attention interruption, the system releases any task-related resources.
If an installation-supplied command or program invokes dynamic allocation, it is the responsibility of the command or program to provide its own remove in-use processing, which is normally provided by the terminal monitor program (TMP).
To properly invoke remove in-use processing, you must be aware of the level of the task that is issuing the dynamic allocation. If the allocation occurs at the primary task level, you must invoke remove in-use processing (SVC 99 with verb code 05) using the IEFZB4D2 mnemonic DRITCBAD and specifying the current TCB address. The current TCB address is in the PSATOLD field of the PSA. The mnemonic DRITCBAD specifies that the in-use attribute is to be used from all resources associated with the specified TCB address.

When the allocation occurs below the primary task level you invoke, remove in-use processing and the IEFZB4D2 mnemonic DRICURNT. DRICURNT specifies that the in-use attribute is to be removed from all resources except those associated with the current task and those associated with higher-level tasks.

For more information about dynamic allocation and remove in-use processing, see .