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Type 07 JFCB Exit List Entry z/OS DFSMSdfp Advanced Services SC23-6861-01 |
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The type 07 JFCB exit list entry allows you to perform a variety of tasks, as described in the following text. The format of the type 07 JFCB exit list entry is:
The virtual storage area into which the JFCB is read must be:
Requirement: Users running in 31-bit
addressing mode must ensure that this area is located below 16 MB
virtual. Each exit list entry must be 4 bytes long. The system recognizes
only the first occurrence of an exit list entry code. Indicate the
end of the exit list by setting the high-order bit in the entry code
byte to 1.
The DCB can be either open or closed when this macro instruction is executed. If accessing concatenated sequential data sets and the DCB is open, the RDJFCB routine reads the JFCB for the current data set. In all other cases, the RDJFCB routine reads the JFCB for the first or only data set. If the RDJFCB routine fails while processing a DCB associated with your RDJFCB request, or you do not provide a virtual storage address in the three low-order bytes of the exit list entry, your task is abnormally terminated. None of the options available through the DCB ABEND exit, as described in z/OS DFSMS Using Data Sets, are available when a RDJFCB macro instruction is issued. |
Copyright IBM Corporation 1990, 2014
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