libc/sys/getgid.2

         Copyright (c) 1983 Regents of the University of California.
 All rights reserved. The Berkeley software License Agreement
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 @(#)getgid.2 6.1 (Berkeley) 05/15/85

 GETGID 2 ""
C 5  NAME
getgid, getegid - get group identity
 SYNOPSIS
gid = getgid()
int gid;

egid = getegid()
int egid;

 DESCRIPTION
 Getgid returns the real group ID of the current process,
 getegid the effective group ID.

The real group ID is specified at login time.

The effective group ID is more transient, and determines
additional access permission during execution of a
``set-group-ID'' process, and it is for such processes
that getgid is most useful.
 "SEE ALSO"
getuid(2), setregid(2), setgid(3)