I'm writing a relatively trivial assembler program that writes output to a
Unix file. I'm getting return code 4 from CLOSE, which of course simply
indicates that the close was unsuccessful. No additional diagnostic
messages are generated.

I've confirmed that I haven't clobbered the DCB or otherwise mangled any
control blocks (as best I can tell, anyway).

Any tips on how to determine the reason that CLOSE refused to close the
file? Thanks...

(The program is an ADRDSSU User Interaction Module exit that reformats DUMP
records into AWSTAPE format and writes them to a Unix file. The path will
eventually be an NFS-mounted filesystem when I get everything working.)

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