redhat man page for geteuid

GETUID(2)						     Linux Programmer's Manual							 GETUID(2)

NAME
       getuid, geteuid - get user identity

SYNOPSIS
       #include <unistd.h>
       #include <sys/types.h>

       uid_t getuid(void);
       uid_t geteuid(void);

DESCRIPTION
       getuid returns the real user ID of the current process.

       geteuid returns the effective user ID of the current process.

       The real ID corresponds to the ID of the calling process.  The effective ID corresponds to the set ID bit on the file being executed.

ERRORS
       These functions are always successful.

CONFORMING TO
       POSIX, BSD 4.3.

SEE ALSO
       setreuid(2), setuid(2)

Linux 0.99.11							    1993-07-23								 GETUID(2)