bouyer@antioche.lip6.fr said:
> The harder part is to find which error to return :) 

I personally would like ENXIO or ENOSPC.
But I just found that my OSF/1
(ahem - DUnix - ahem - Tru64whatever) box
returns EIO if I try to open the empty CDROM drive - for the
'a' partition as for the raw device.
(They have the CAM device to deal with changers etc anyway.)

best regards
Matthias