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SubjectRe: CD writing in future Linux (stirring up a hornets' nest)
Jan Engelhardt wrote:
> I would say we all forgot to RTFM. Because O_EXCL does nothing *unless*
> O_CREAT is specified, which probably *is not* specified in cdrecord or
> hal. There is no reason to have hal or cdrecord create a device node -
> which you can't do with open() anyway.
>

I think you are misinterpreting the man page, because it isn't worded
very clearly. It should not even mention O_CREAT because it has nothing
to do with O_EXCL; it is just repeating the semantics of O_CREAT ( if
the file already exists, the call fails ) which would of course, apply
if you do use O_CREAT in conjunction with any other flag including
O_EXCL. It does not say that you must use O_EXCL with O_CREAT. The
rest of the description talks about using lockfiles as an alternative to
ensure exclusive access to the file on NFS where O_EXCL is broken. The
intent of O_EXCL is clearly to provide the caller with exclusive access
to the file.



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