In a data control block exit list, you can specify the address of a routine that receives control when end-of-volume is reached in processing a physical sequential data set (BSAM or QSAM). For information about forming an exit routine and coding the EOV exit list for physical sequential data sets, see z/OS DFSMS Using Data Sets. The routine is entered after a new volume is mounted and all necessary label processing is completed. If the volume is magnetic tape, the tape is positioned after the tape mark that precedes the beginning of the data. The end-of-volume exit routine may take a checkpoint by issuing the CHKPT macro instruction. The job step can be restarted from this checkpoint. When the job step is restarted, the volume is mounted and positioned as upon entry to the routine.

The end-of-volume exit routine returns control the same way as any other data control block exit routine. Restart is impossible if changes are made to the link pack area or nucleus after the checkpoint is taken. When the step is restarted, the virtual storage addresses of end-of-volume modules must be the same as when the checkpoint was taken.