getuid, geteuid - get user identity
uid = getuid()
euid = geteuid()
Getuid returns the real user ID of the current process, geteuid the effective user ID.
The real user ID identifies the person who is logged in. The effective user ID gives the
process additional permissions during execution of "set-user-ID" mode processes, which use
getuid to determine the real-user-id of the process that invoked them.
SEE ALSOgetgid(2), setreuid(2)4th Berkeley Distribution January 7, 1986 GETUID(2)