Network Router User Manual

Cisco IOS for S/390 Release 2.0 Release Notes 11
Cisco IOS for S/390 Planning Guide
Exit Work Area
If requested, the exit facility provides a work area to the exit program upon each invocation, except
the INIT exit point. Request the work area with the EWALENGTH parameter of the EXIT statement
in member IJTCFG
xx, or with a parameter returned by the program at the INIT exit point (the
program parameter taking precedence).
The Exit Work Area (EWA) addressed will be passed to the exit program at each exit point as the
fifth parameter, following the address of the message-writing routine.
Note The parameter lists for all exit points must be updated.
The EWA size can be from 1 to 65532 bytes. It is taken from pooled storage; the smallest pool that
will satisfy the requested size will be used. Pool usage can be monitored via the IFS POOL
command. One of the following pools will be used:
Table 3 EWA Pools
Note These figures are provided to allow the exit program designer to make efficient use of the
EWA buffers. It is important that the exit use only the size requested on the EWALENGTH
parameter, or by the INIT exit. The exit facility monitors the exit program's use of the EWA, and will
force an ABEND if an overrun is detected, even if space remains in the buffer.
Add the following parameters to the INIT exit parameter list, following the subsystem ID address:
Table 4 INIT Exit Parameters
Pool Name EWA Size
256B 1-252
512B 253-508
01KB 509-1020
04KB 1021-4092
08KB 4093-8188
16KB 8189-65532
Offset
Parameter
Length
Data
Length Description
32 04 04 The address of the four-byte Cisco IOS for S/390 subsystem ID.
36 04 04 The address of a fullword area in which the exit program may put the
size of the EWA to be obtained.
40 04 04 The address of a fullword area in which the exit program may put the
address of a recovery routine to be called in the event the exit program
ABENDs at a subsequent entry point.