Extension Pointer
Extension Pointer is a four-byte field that specifies the address of the first or only DBCAREA extension.
In this language... |
The variable name for Extension Pointer is... |
COBOL |
DBCAREA‑EXT‑PTR |
PL/I |
EXT_PTR |
C |
extension_pointer |
IBM Assembler |
DBCAXP |
This routine... |
Takes the action for Extension Pointer... |
DBCHINI |
writes |
DBCHCL |
reads (IRQ; IWPF) |
Extension Pointer is used by... |
To... |
applications |
write |
Each extension applies only to particular functions, so care must be taken to address the proper extension before invoking a function and clearing the Extension Pointer when that function is complete.
For more information about DBCAREA extensions, see Chapter 4: “DBCAREA Extensions.”