Setting Up User Exits › Receive Exit › RPL Notes

RPL Notes

The following notes about the RPL apply:

• The RPL is a copy of that used for the RECEIVE. It should not be used for VTAM requests.
• Using MODCB, TESTCB, and SHOWCB will add several thousand instructions to the path length. Use the IFGRPL DSECT and address the RPL directly.
• RPLAREA points to the data or a buffer list. RPLRLEN contains the data length or buffer list length. Bit RPLBUFFL in RPLOPT6 indicates a buffer list.
• The ISTBLENT DSECT describes a buffer list entry. BLEAREA points to the data. BLERLEN contains the data length. Dividing RPLRLEN by 16 gives the number of buffer list entries.

Application ID

The session will have an application ID of SMV1.

R15

On return, R15 should be set to 0. Any other value can have unexpected consequences.