Re: Notification to user-space upon CD eject button being pressed?

Brian Gerst (bgerst@quark.vpplus.com)
Wed, 25 Mar 1998 03:38:49 +0000

James Mastros wrote:
>
> On Wed, 25 Mar 1998, David Woodhouse wrote:
> > Is it possible for a user-space program to receive notification when the eject
> > button is pressed on a CD drive?
> >
> > It would be useful for automountd to automatically unmount and eject CDs when
> > the eject button is pressed.
> With IDE CDs, anyway, it isn't possible for us to do this -- the drive
> doesn't tell us. We can have the drive be locked or unlocked, but in
> unlocked position, it ejects before telling us anything, and in locked
> position, it doesn't tell us when the button is pressed.
>
> We could poll the drive for a change (which is what win95 does, AFAIK),
> but that is VERY inefficient.

Why not make it an ioctl command and let the userspace daemon poll (like
say every few seconds). Do SCSI devices send a message when the eject
button is pressed?

-- 


						Brian Gerst


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