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Copyright (c) 1996, Sun Microsystems, Inc. All Rights Reserved.
Copyright 1989 AT&T
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When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
getuid, geteuid, getgid, getegid - get real user, effective user, real group, and effective group IDs

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

uid_t getuid(void);

uid_t geteuid(void);

gid_t getgid(void);

gid_t getegid(void);

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

The geteuid() function 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.

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

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

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

Interface Stability Standard

MT-Level Async-Signal-Safe

Intro(2), setuid(2), attributes(5), standards(5)