[Bug 254511] daemon(8): Allow to set daemonized process realtime or idletime scheduling priority

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254511

            Bug ID: 254511
           Summary: daemon(8): Allow to set daemonized process realtime or
                    idletime scheduling priority
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: yuri at freebsd.org

Created attachment 223530
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=223530&action=edit
daemon-add-priority.patch

The attached patch adds arguments -e {priority}, -i {priority} for realtime and
idle priorities respectively.

These arguments can be used when the process should run with an altered
priority level.

rtprio(1) generally sets priority process level, but in case of daemon(8)
invocation rtprio(1) can't be used as a separate command.

Running 'rtprio {priority} daemon ... commmand ...' would also change daemon(8)
process' priority which isn't what is desired.

Running 'daemon ... rtprio {priority} command ...' can't generally work because
daemon(8) can change process' user and rtprio(1) would fail.

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