cpu_get_cpu_unum
extern int cpu_get_cpu_unum(int, char *, int, int *);
if (cpu_get_cpu_unum(cpuid, unum, UNUM_NAMLEN, &size) != 0) {
extern int cpu_get_cpu_unum(int, char *, int, int *);
if (cpu_get_cpu_unum(cpuid, unum, UNUM_NAMLEN, &len) != 0) {
int cpu_get_cpu_unum(int cpuid, char *buf, int buflen, int *lenp);