On Tue, Nov 27, 2001 at 04:49:31PM +0000, Sam Halliday wrote:
> hello,
>
> i have set up cdrecord on my sysem allowing certain privileged users part of
> a "cdwriter" group to use the relevant SCSI devices so that they may write
> cd's. although this seems to be running well, users who are not root all get
> the following warning when writing cd's:
> ---
> 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.
> ---
No devices, the matter is the scheduling policy:
Processes scheduled with SCHED_OTHER must be assigned the static priority 0,
processes scheduled under SCHED_FIFO or SCHED_RR can have a static priority
in the range 1 to 99. Only processes with superuser privileges can get a
static priority higher than 0 and can therefore be scheduled under
SCHED_FIFO or SCHED_RR.
>From man sched_setscheduler (POSIX.1b)
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