Re: ide cdrom sg like access / rpcmgr ?

Jens Axboe
2003-11-12T17:32:05Z

On Wed, Nov 12 2003, Linus Torvalds wrote:
>
> On Wed, 12 Nov 2003, Jens Axboe wrote:
> >
> > To make the below work, all you probably need to do is change sgio() to
> > use CDROM_SEND_PACKET for instance. That'll work in 2.4 and 2.6. You
> > just need to fill a cdrom_generic_command and send it to the cdrom fd.
>
> Don't forget: you also need to open the device with "O_NONBLOCK", so as to
> not make the kernel try to figure out the media etc. Otherwise you can't
> do anything with media that the kernel can't figure out (ie empty media
> that hasn't been written to, or even no media at all).
>
> Depending on what your tool is for, this may or may not be a problem, of
> course. If you only want to send commands to a drive that already has a
> readable media in it, you can skip the O_NONBLOCK.

Yes of course, you are absolutely right.

--
Jens Axboe