Re: cd burning, capabilities and available modes

[Lee Revell]

On Wed, 2004-12-01 at 13:40 +0000, J.A. Magallon wrote:
> As user:
> werewolf:/store/tmp> cdrecord -dummy dev=ATAPI:1,0,0 *.iso
> ...
> cdrecord: Cannot allocate memory. WARNING: Cannot do mlockall(2).
> cdrecord: WARNING: This causes a high risk for buffer underruns.
> cdrecord: Operation not permitted. WARNING: Cannot set RR-scheduler
> cdrecord: Permission denied. WARNING: Cannot set priority using setpriority().
> cdrecord: WARNING: This causes a high risk for buffer underruns.

You can use the realtime LSM (see list archives) to let specific groups
of users use mlockall and run RT tasks.  Just load it like:

modprobe realtime gid=29

and make gid 29 your "cdrecord" group.

This should make CD burning as joeuser reliable as root.  Most people
use this for low latency audio but I think cd burning is a wider and
completely unexplored application.

Lee

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