GETUID(2) System Calls Manual GETUID(2)
NAME
getuid, geteuid - get user identity
SYNOPSIS
#include <sys/types.h>
uid = getuid()
uid_t uid;
euid = geteuid()
uid_t euid;
DESCRIPTION
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 ALSO
getgid(2), setreuid(2)
4th Berkeley Distribution January 7, 1986 GETUID(2)
