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System Components and Execution › CA TLMS Process Flow › Input Tape OPEN Process Steps

Input Tape OPEN Process Steps

  1. An SVC call, implemented using an operating system intercept, is issued out of OPEN to perform input data set name verification.
  2. The TLMSOPEN module gains control, builds a CA TLMS type 6 transaction, and issues the TLMSQMGR SVC.
  3. The TLMSQMGR gains control, receives the transaction and cross-memory posts TLMSMAIN.
  4. TLMSMAIN is activated by the cross-memory post.
  5. TLMSMAIN responds to the post by calling TLMSMSGQ.
  6. TLMSMSGQ receives a copy of the transaction through an SVC call to TLMSQMGR. It then calls TLMSUPDT for processing.
  7. TLMSUPDT accesses the Volume Master File specified in the CTS procedure through routines in its copy of TLMSVMRW.
  8. The VMF is accessed by volume serial number (VSN).
  9. (Optional) The retrieved VMF record is examined to validate the DSN being opened if the IDSNVER system option is set to YES.
  10. TLMSMSGQ is notified that the transaction is successful (this is the same DSN), or that it is unsuccessful (this is not the same DSN).
  11. The initiating task is posted to report the status of the transaction. In this case, OPEN is posted.
  12. OPEN is activated by the post from TLMSMSGQ.
  13. Using the return vector to OPEN, OPEN either proceeds or dismounts the volume and tries again.