Use &SYSADATA_VOLUME in a macro definition to obtain the volume identifier of the first volume containing the data set to which the assembler is writing the associated data.
The local-scope system variable symbol &SYSADATA_VOLUME is assigned a read-only value each time a macro definition is called.
If the assembler runs on the CMS component of the z/VM operating system, and the associated data is being written to a Shared File System CMS file, &SYSADATA_VOLUME is assigned the value "** SFS".
If the volume on which the data set resides is not labeled, &SYSADATA_VOLUME is assigned a null character string.
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