> perhaps you can explain how an audio application with a GUI that needs
> to take advantage of SCHED_FIFO in some subset of its threads, and/or
> mlock(2), can be run without suid (or sudo, though it seems that the
> problems there are pretty similar) ?
Capabilities let you control which you get. The normal approach is to run
the X11 interface unpriviledged - after all it is just display not real time
tied. When you get to video playback you get X and stuff involved and it
does get harder.
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