to make sure that
does not delete a file opened on a unit
and perhaps to trigger a fatal diagnostic
Note: It is not sufficient for
(its version of
to assume that
READONLY does not need some kind of explicit support
at run time,
due to UNIX systems not (generally) needing it.
g77 is not just a UNIX-based compiler!
Further, mounting of non-UNIX filesystems on UNIX systems
(such as via NFS)
might require proper
(Similar issues might be involved with supporting the