Re: [PATCH] pre8/asm-i386/string.h + de4x5 -> no go

Jens Axboe (axboe@image.dk)
Tue, 19 Jan 1999 21:47:17 +0100

Matthew Kirkwood wrote:
> > Hm, my drive can reliably detect if it has a medium in or not, but
> > that still doesn't help it to eject tray.
> >
> > {atlas} [~/try]% eject --- (no medium)
> > eject: open failed for `/dev/hdc': No medium found
>
> I get this.
>
> > {atlas} [~/try]% eject --- (medium in)
> > eject: CDROMEJECT ioctl failed for `/dev/hdc': Operation not supported
>
> But not this.

If you don't open O_NONBLOCK cdrom tries to open the device for data
and fails when no medium is inserted. You should be able to eject
it fine (or issue other ioctl's), as long as you do that. strace of
eject :

open("/dev/hdb", O_RDONLY) = -1 ERRNO_123 (No medium found)

Whereas

fd = open("/dev/hdb", O_RDONLY | O_NONBLOCK);
ioctl(fs, CDROMEJECT);

works fine.

-- 
*  Jens Axboe <axboe@image.dk>
*  Linux CD-ROM Maintainer
* "The only thing that interferes with my
*  learning is my education." -- A. Einstein


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