.th getuid IV 4/21/86
.sh NAME
getuid  -  get user identifications
.sh SYNOPSIS
getuid( )
.ft R
.sh DESCRIPTION
Getuid returns a word, the low byte of which contains the real
user ID of the current process.  The high byte contains the effective
user ID of the current process.  The real user ID identifies the person
who is logged in, in contrast to the effective user ID, which
determines his access permission at the moment.  It is thus useful to
programs which operate using the ``set user ID'' mode, to find out who
invoked them.
.sh "SEE ALSO"
None.
.sh DIAGNOSTICS
None.
.sh KSOS
KSOS user IDs are 16 bits each, but are mapped into 8 bits
by using only the low order byte.
