In an exit list, you can specify a code that indicates that you want to defer nonstandard input trailer label processing from end-of-data until the data set is closed. The address portion of the entry is not used by the operating system. This exit list entry has an effect only when reading magnetic tape that has nonstandard labels. You specified LABEL=(x,NSL) on the DD statement.

An end-of-volume condition exists in several situations. Two examples are: (1) when the system reads a tape mark at the end of a volume of a multivolume data set but that volume is not the last, and (2) when the system reads a tape mark at the end of a data set. The first situation is referred to here as an end-of-volume condition, and the second as an end-of-data condition, although it, too, can occur at the end of a volume.

For an end-of-volume (EOV) condition, the EOV routine passes control to your installation's nonstandard input trailer label routine, whether this exit code is specified. For an end-of-data condition when this exit code is specified, the EOV routine does not pass control to your installation's nonstandard input trailer label routine. Instead, the CLOSE routine passes control to your installation's nonstandard input trailer label.