UIDC
if ((uidtb = calloc(UID_SZ, sizeof(UIDC *))) == NULL) {
if ((usrtb = calloc(UNM_SZ, sizeof(UIDC *))) == NULL) {
UIDC **pptr, *ptr = NULL;
*pptr = ptr = malloc(sizeof(UIDC));
UIDC **pptr, *ptr = NULL;
*pptr = ptr = malloc(sizeof(UIDC));
static UIDC **uidtb; /* uid to name cache */
static UIDC **usrtb; /* user name to uid cache */