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)