rcopy
ret = rcopy(source, target);
static int rcopy(const char *, char *);
rwlock_t rcopy;
(void) memcpy(&rcopy, rp, sizeof (rcopy));
rwstate = (uint32_t)rcopy.rwlock_readers;
process = (rcopy.rwlock_type & USYNC_PROCESS);
ultos((uint64_t)rcopy.rwlock_owner, 16,
ultos((uint64_t)rcopy.rwlock_ownerpid, 10,