Re: PATCH/FIX for drivers/cdrom/cdrom.c

[Lennart Sorensen]

On Thu, Aug 17, 2006 at 09:41:06AM -0400, Jeff Garzik wrote:
> Lennart Sorensen wrote:
> >Why can't O_EXCL mean that the kernel prevents anyone else from issuing
> >ioctl's to the device?  One would think that is the meaning of exlusive.
> >That way when the burning program opens the device with O_EXCL, no one
> >else can screw it up while it is open.  If it happens to be polled by
> >hal when the burning program tries to open it, it can just wait and
> >retry again until it gets it open.
> 
> Such use of O_EXCL is a weird and non-standard behavior.

So what method exists for opening a file/device an guaranteeing that
nothing else can do anything to it?

Looking an man 2 open, I can't even see any way O_EXCL even has a normal
meaning for a device, so how much more "weird and non-standard" would it
be to have it control exclusive access to a device?  It appears it is
only supposed to have a meaning for creating files.

--
Len Sorensen
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