CentOS 5.4

GNU/Linux	CentOS 5.4
	geteuid(2)

GETUID

NAME

getuid, geteuid − get user identity

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

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

getuid() returns the real user ID of the current process.

geteuid() returns the effective user ID of the current process.

These functions are always successful.

POSIX.1-2001, 4.3BSD.

In Unix V6 the getuid() call returned (euid << 8) + uid. Unix V7 introduced separate calls getuid() and geteuid().