lkml.org 
[lkml]   [2006]   [Feb]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: CD writing in future Linux (stirring up a hornets' nest)
Date
On Tuesday 14 February 2006 7:23 am, Matthias Andree wrote:
> > - How to send non disturbing SCSI commands from another
> > cdrecord process in case one or more are already running?
>
> Open the device node you obtained and
> send non-disturbing commands through it.
>
> No special treatment required.

On a mostly unrelated note, I've pondered adding quick and dirty versions of
mkisofs and cdrecord to busybox for a while. (Low priority, back burner
thing.) I actually poked at the cdrecord source once or twice, but it's
unintellgible and disgusting.*

With mkisofs I can just start from the spec, reverse engineer a few existing
ISOs, or grab the really old code from before Joerg got ahold of it (back
when it was still readable). That's no problem. But for cdrecord, I can't
find documentation on what the kernel expects.

I'm only interested in supporting ATA cd burners under a 2.6 or newer kernel,
using the DMA method. (SCSI is dead, I honestly don't care.) I was hoping I
could just open the /dev/cdrom and call the appropriate ioctls on it, but
reading the cdrecord source proved enough of an exercise in masochism that I
always give up after the first hour and put it back on the todo list.

I suppose I should say "screw the source code" and just run the cdrecord
binary under strace to see what it's doing, but I thought I'd ask: is there a
good starting place, somewhere? (Or is there already a simple "cdrecord
file.iso /dev/cdrom" someplace?) I expect I'll wind up buying a 50-pack of
coasters anyway, and I doubt I'll damage my laptop's burner too badly...

Rob

* How bad? Random example of ignoring how the rest of the world works is that
it runs autoconf from within make, meaning there's no obvious way to specify
"./configure --prefix=/mypath", so the last time I played with it (which was
a while ago), I wound up doing this:

cd /sources &&
tar xvjf buildtools/cdrtools-2.00.3.tar.bz2 &&
cd cdrtools-2.00.3 &&
make &&
cp mkisofs/OBJ/*/mkisofs cdrecord/OBJ/*/cdrecord \
cdda2wav/OBJ/*/cdda2wav /usr/bin &&
cp mkisofs/mkisofs.8 /usr/man/man8 &&
cp cdrecord/cdrecord.1 cdda2wav/cdda2wav.1 /usr/man/man1 &&
cd .. &&
rm -rf cdrtools-2.00.3

if [ $? -ne 0 ]; then exit 1; fi

I could understand if it didn't use autoconf at all, but having autoconf but
_not_ a configure step is deeply into control freak territory...

Rob
--
Never bet against the cheap plastic solution.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-02-14 23:53    [W:0.163 / U:18.520 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site