On Sat, 25 Mar 2006, R. Bernstein wrote:
> I came across this interesting link to a program called PLScsi
> http://members.aol.com/plscsi/mac/
>
> But the usual OSX caveat applies. From http://members.aol.com/plscsi/mac/
>
> Second nastiest remaining technical issue are the significant side
> effects of the open/ close in the launch-open-ioctl-close-exit
> sequence that's fundamental to the idea of plscsi at the command
> line. In Mac OS X, open works only if preceded by diskutil unmount
> (that's "unmount" not "umount"), and close provokes automount, ouch.
That sounds very much like the same problem that has come up in the
past - that of getting an 'exclusive access reservation'. Without
that you need to be the owner of the device, issue an unmount, do your
command, but then the kernel/system goes and remounts the device when
the program closes.
Maybe not 100% the same thing but it sure sounds similar/familiar.
OSX is an interesting system but its I/O model sure strikes me as
being baroque - not as nice as BSDi ;)
Cheers,
Steven Schultz
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