4.4BSD/usr/share/man/cat2/getegid.0

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GETGID(2)                   BSD Programmer's Manual                  GETGID(2)

NNAAMMEE
     ggeettggiidd, ggeetteeggiidd - get group process identification

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ssyyss//ttyyppeess..hh>>

     _g_i_d___t
     ggeettggiidd(_v_o_i_d);

     _g_i_d___t
     ggeetteeggiidd(_v_o_i_d);

DDEESSCCRRIIPPTTIIOONN
     The ggeettggiidd() function returns the real group ID of the calling process,
     ggeetteeggiidd() returns the effective group ID of the calling process.

     The real group ID is specified at login time.

     The real group ID is the group of the user who invoked the program.  As
     the effective group ID gives the process additional permissions during
     the execution of ``_s_e_t_-_g_r_o_u_p_-_I_D'' mode processes, ggeettggiidd() is used to de-
     termine the real-user-id of the calling process.

EERRRROORRSS
     The ggeettggiidd() and ggeetteeggiidd() functions are always successful, and no return
     value is reserved to indicate an error.

SSEEEE AALLSSOO
     getuid(2),  setregid(2),  setgid(3)

SSTTAANNDDAARRDDSS
     GGeettggiidd() and ggeetteeggiidd() conform to IEEE Std 1003.1-1988 (``POSIX'').

4.2 Berkeley Distribution        June 4, 1993                                1