Use &SYSADATA_DSN in a macro definition to obtain the name of the data set to which the assembler is writing the associated data.
The local-scope system variable symbol &SYSADATA_DSN is assigned a read-only value each time a macro definition is called.
When the assembler runs on the z/OS operating systems, the value of the character string assigned to &SYSADATA_DSN is always the value stored in the JFCB for SYSADATA. If SYSADATA is allocated to DUMMY, or a NULLFILE, the value in &SYSADATA_DSN is NULLFILE.
For example, &SYSADATA_DSN might be assigned a value such as:
IBMAPC.SYSADATA
When the assembler runs on the CMS component of the z/VM operating systems, the value of the character string assigned to &SYSADATA_DSN is determined as follows:
| SYSADATA Allocated To: | Contents of &SYSADATA_DSN: |
|---|---|
| CMS file | The 8-character filename, the 8-character filetype, and the 2-character filemode of the file, each separated by a space |
| Dummy file (no physical I/O) | DUMMY |
| Labeled tape file | The data set name of the tape file |
| Unlabeled tape file | TAPn, where n is a value from 0 to 9, or A to F. |
For example, &SYSADATA_DSN might be assigned a value such as:
SAMPLE SYSADATA A1
The value of the character string assigned to &SYSADATA_DSN is the file id from the SYSADAT dlbl.
For example, &SYSADATA_DSN might be assigned a value such as:
MYDATA
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