&SYSLIN_DSN System Variable Symbol

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Use &SYSLIN_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 OBJECT, GOFF, or XOBJECT is specified.

The local-scope system variable symbol &SYSLIN_DSN is assigned a read-only value each time a macro definition is called.

z/OS®
The value of the character string assigned to &SYSLIN_DSN is always the value stored in the JFCB for SYSLIN. If SYSLIN is allocated to DUMMY, or a NULLFILE, the value in &SYSLIN_DSN is “NULLFILE”.
z/VM®
The value of the character string assigned to &SYSLIN_DSN is determined as follows:
Table 1. Contents of &SYSLIN_DSN on CMS
SYSLIN Allocated To: Contents of &SYSLIN_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.
z/VSE®

The value of the character string assigned to &SYSLIN_DSN is determined as follows:

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

Examples:

On z/OS, &SYSLIN_DSN might be assigned a value such as: 
IBMAPC.OBJ
On CMS, &SYSLIN_DSN might be assigned a value such as: 
SAMPLE   TEXT     A1
Notes:
  1. If the OBJECT user exit provides the data set information then the value in &SYSLIN_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 &SYSLIN_DSN (T'&SYSLIN_DSN) is always U.
  3. The value of the count attribute of &SYSLIN_DSN (K'&SYSLIN_DSN) is equal to the number of characters assigned as a value to &SYSLIN_DSN.