Flag settings for environments initialized for TSO/E and ISPF

If your installation uses ISPF, there are several considerations about flag settings for language processor environments that are initialized for TSO/E and ISPF. In the default IRXISPRM parameters module for ISPF, most of the mask settings for the flags parameters are 0, which means IRXINIT uses the values from TSO/E (IRXTSPRM module). If you provide your own IRXISPRM load module, you should not change the mask values for the following flags. The mask values for these flags should be 0.

CMDSOFL — command search order flag
FUNCSOFL — function and subroutine search order flag
NOSTKFL — no data stack flag
NOREADFL — no read (input file) flag
NOWRTFL — no write (output file) flag
NEWSTKFL — new data stack flag
NOESTAE — recovery ESTAE flag
RENTRANT — reentrant/non-reentrant flag
SPSHARE — subpool sharing flag

The values for these flags in ISPF should be the same as the values that IRXINIT uses when initializing an environment for the TSO/E session. When IRXINIT initializes an environment for ISPF, IRXINIT uses the values defined for the previous environment (TSO/E) because the mask settings are 0. Using the same values for these flags for both TSO/E and ISPF prevents any processing problems between the ISPF and TSO/E sessions.

If you do want to change one of the flag values, change the value in the IRXTSPRM parameters module for TSO/E. The change is inherited by ISPF when IRXINIT initializes an environment for the ISPF screen. For example, suppose you want to change the search order the system uses for locating external functions and subroutines. The FUNCSOFL flag controls the search order. You can provide a IRXTSPRM parameters module for TSO/E and change the flag setting. ISPF inherits the changed flag setting when IRXINIT initializes an environment.