NAME

getuid, geteuid, getgid, getegid − get real user, effective user, real group, and effective group IDs

SYNOPSIS

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

uid_t getuid(void);

uid_t geteuid(void);

gid_t getgid(void);

gid_t getegid(void);

MT-LEVEL

Async-Signal-Safe

DESCRIPTION

getuid() returns the real user ID of the calling process.  The real user ID identifies the person who is logged in. 

geteuid() returns the effective user ID of the calling process.  The effective user ID gives the process various permissions during execution of “set-user-ID” mode processes which use getuid () to determine the real user ID of the process that invoked them. 

getgid() returns the real group ID of the calling process. 

getegid() returns the effective group ID of the calling process. 

SEE ALSO

intro(2), setuid(2)

SunOS 5.5/SPARC  —  Last change: 4 Dec 1991