This is a continuation of !639 (closed) to add more attributes to posix. It seems getgrouplist
was added in the mean time, so this now should only deal with
sched_rr_get_interval
sched_getscheduler
sched_setscheduler
sched_getparam
The tricky ones are sched_{g,s}etparam
which need a SchedParamType
, which seems to be a named tuple?