how to avoid fflush after fclose?

[Mike Khaw]

Calling fflush after fclose appears not to hurt under Unix, but VMS returns
EOF.  Is there a way to test if a FILE *fptr has been closed so that I don't
inadvertently call fflush after fclose?  Ideally the solution is a function
in both the usual Unix C libraries and in the VMS C runtime library.

(If you're reading this in comp.os.vms, please reply by email, as I don't
usually pay any attention to VMS :))

Thanks,
Mike Khaw
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