kern_getrusage
error = kern_getrusage(td, uap->who, &s);
error = kern_getrusage(td, uap->who, &s);
kern_getrusage(curthread, RUSAGE_CHILDREN, &usage);
error = kern_getrusage(td, uap->who, &ru);
int kern_getrusage(struct thread *td, int who, struct rusage *rup);