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OpenSolaris 2009.06 - man page for getgid (opensolaris section 2)

getuid(2)							   System Calls 							 getuid(2)

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);
DESCRIPTION
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.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+
SEE ALSO
Intro(2), setuid(2), attributes(5), standards(5) SunOS 5.11 28 Dec 1996 getuid(2)