The schedrr getinterval system call
The sched_rr_get_interval( ) system writes in a structure stored in the User Mode address space the Round Robin time quantum for the real-time process identified by the pid parameter. If pid is zero, the system call writes the time quantum of the current process.
The corresponding sys_sched_rr_get_interval( ) service routine invokes, as usual, find_process_by_pid( ) to retrieve the process descriptor associated with pid. It then converts the number of ticks stored in the nice field of the selected process descriptor into seconds and nanoseconds and copies the numbers into the User Mode structure.
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