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, 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 DBCAREA Extensions.