Using Buffer Lists

A buffer list consists of one or more chained control blocks, each with a header and buffer list entries, obtained and initialized by your program before calling CVAF. The header indicates whether the buffer list is for DSCBs. The entries point to and describe the buffers. You can create buffer lists in two ways:

Directly, when you fill in the arguments and buffer addresses of DSCBs to be read or written
Indirectly (by CVAF), when you code the IXRCDS=KEEP and/or MAPRCDS=YES keywords.

The ICVAFBFL macro maps CVAF buffer lists. Table 1 shows the format of a buffer list header. Table 1 shows the format of a buffer list entry.