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NUMITEMS
SET
LENGTH is an input field on a WRITEQ request, and an output field on a READQ
request that specifies SET. It is both an input and an output field on a READQ
request that specifies INTO.
ITEM is an input field on a READQ request, and on a WRITEQ request that
specifies REWRITE. It is both an input and an output field on a WRITEQ request
that does not specify REWRITE.
Modifying input fields
The correct method of modifying an input field is to create a new copy of it, and to
change the address in the command-level parameter list to point to your new data.
Note: You must never modify an input field by altering the data that is pointed to by
the command-level parameter list. To do so would corrupt storage belonging
to the application program and would cause a failure when the program
attempted to reuse the field.
Modifying output fields
The technique described in “Modifying input fields” is not suitable for modifying
output fields. (The results would be returned to the new area instead of the
application’s area, and would be invisible to the application.)
An output field is modified by altering the data that is pointed to by the
command-level parameter list. In the case of an output field, you can modify the
application’s data in place, because the application is expecting the field to be
modified anyway.
Modifying fields used for both input and output
An example of a field that is used for both input and output is LENGTH on a
READQ request that specifies INTO. You can treat such fields in the same way as
output fields, and they are considered to be the same.
Modifying the EID
It is not possible to modify the EID to make major changes to requests. It is not
possible, for example, to change a READQ request to a WRITEQ request.
However, you can make minor changes to requests, such as to turn on the
existence bit for SYSID so that the request can be changed into one that is shipped
to a remote system.
The list that follows shows the bits in the EID that can be modified. Any attempt to
modify any other part of the EID is ignored.
TS_BITS1
X'02' The existence bit for SYSID.
TS_EIDOPT7
A user exit program at XTSEREQ can set the following on or off for all WRITEQ
TS commands:
temporary storage EXEC interface program exits
Chapter 1. Global user exit programs 199