&SYSADATA_DSN System Variable Symbol
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.
- z/OS®
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
- z/VM®
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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:
Table 1. Contents of &SYSADATA_DSN on CMS SYSADATA Allocated To: Contents of &SYSADATA_DSN: CMS file The 8-character file name, the 8-character file type, and the 2-character file mode 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
- z/VSE®
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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
- The value of the type attribute of &SYSADATA_DSN (T'&SYSADATA_DSN) is always U.
- The value of the count attribute of &SYSADATA_DSN (K'&SYSADATA_DSN) is equal to the number of characters assigned as a value to &SYSADATA_DSN. In the previous CMS example, the count attribute of &SYSADATA_DSN is 20.