&SYSPUNCH_DSN System Variable Symbol

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Use &SYSPUNCH_DSN in a macro definition to obtain the name of the data set to which the assembler is writing the object records when assembler option DECK is specified.

The local-scope system variable symbol &SYSPUNCH_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 &SYSPUNCH_DSN is always the value stored in the JFCB for SYSPUNCH. If SYSPUNCH is allocated to DUMMY, or a NULLFILE, the value in &SYSPUNCH_DSN is NULLFILE.

When the assembler runs on the CMS component of the VM operating systems, the value of the character string assigned to &SYSPUNCH_DSN is determined as follows:

Table 1. Contents of &SYSPUNCH_DSN on CMS
SYSPUNCH Allocated To: Contents of &SYSPUNCH_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
Punch PUNCH
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.

On z/VSE®, the value of the character string assigned to &SYSPUNCH_DSN is determined as follows:

Table 2. Contents of &SYSPUNCH_DSN on z/VSE
SYSPCH Assigned To: Contents of &SYSPUNCH_DSN:
Disk file The file-id
Punch SYSPCH
Labeled tape file The file ID of the tape file
Unlabeled tape file SYSPCH

Examples:

On z/OS, &SYSPUNCH_DSN might be assigned a value such as: 
IBMAPC.IBMAPCA.JOB06734.D0000103.?
On CMS, &SYSPUNCH_DSN might be assigned a value such as: 
PUNCH
Notes:
  1. If the PUNCH user exit provides the punch data set information then the value in &SYSPUNCH_DSN is the value extracted from the Exit-Specific Information block described in the section Exit-Specific Information Block in the HLASM Programmer's Guide.
  2. The value of the type attribute of &SYSPUNCH_DSN (T'&SYSPUNCH_DSN) is always U.
  3. The value of the count attribute of &SYSPUNCH_DSN (K'&SYSPUNCH_DSN) is equal to the number of characters assigned as a value to &SYSPUNCH_DSN.