ultrix man page for getegid

getgid(2)							System Calls Manual							 getgid(2)

Name
       getgid, getegid - get group identity

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

       gid = getgid()
       gid_t gid;

       egid = getegid()
       gid_t egid;

Description
       The system call returns the real group ID of the current process, and the call returns 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. The
       call is most useful with processes that are ``set-group-ID.''

Environment
       Differs from the System V definition in that the return values are of type int, instead of type unsigned short.

See Also
       getuid(2), setregid(2), setgid(3)

																	 getgid(2)