Re: Proposal "LUID"

[Albert D. Cahalan]

>>  1) init should start up with LUID==-1 (it's not a valid login ID).
> 
> Our UID space is unsigned.

kernel$ grep uid * | grep -- -1
sys.c:  if (ruid != (uid_t) -1) {
sys.c:  if (euid != (uid_t) -1) {
sys.c:  if (ruid != (uid_t) -1 ||
sys.c:      (euid != (uid_t) -1 && euid != old_ruid))
sys.c:          if ((ruid != (uid_t) -1) && (ruid != current->uid) &&
sys.c:          if ((euid != (uid_t) -1) && (euid != current->uid) &&
sys.c:          if ((suid != (uid_t) -1) && (suid != current->uid) &&
sys.c:  if (ruid != (uid_t) -1) {
sys.c:  if (euid != (uid_t) -1) {
sys.c:  if (suid != (uid_t) -1)

Well then, "(uid_t) -1" if you prefer. C doesn't seem to care much,
at least on two's-complement hardware.