[linux-audio-dev] Re: [Jackit-devel] usetsched: RT-priority changer library

[Paul Davis]

>i wrote a small helper library which allows applications to change
>their realtime-priority without having root privilege.
>
>the method is similar like utempter library:  the library forks and
>execs the checker program which is set as setuid-root.  then the
>checker proves the invoking application and user (group or host) is
>registered in the list, and if it's ok, changes the RT-priority of the
>process.  since each user and each application is tested, it's more
>secure.  the advantage is also that no special kernel patches are
>necessary.

takashi - this isn't enough for most apps, because they need to use
mlockall(2) as well. i don't think there is anyway to get the
priviledge for this without either have an euid of 0 or have the
relevant capabilities.

--p