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

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

NNAAMMEE
     sseettrreeggiidd - set real and effective group ID

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<uunniissttdd..hh>>

     _i_n_t
     sseettrreeggiidd(_i_n_t _r_g_i_d, _i_n_t _e_g_i_d);

DDEESSCCRRIIPPTTIIOONN
     The real and effective group ID's of the current process are set to the
     arguments.  Unprivileged users may change the real group ID to the effec-
     tive group ID and vice-versa; only the super-user may make other changes.

     Supplying a value of -1 for either the real or effective group ID forces
     the system to substitute the current ID in place of the -1 parameter.

     The sseettrreeggiidd(_f_u_n_c_t_i_o_n, _w_a_s, _i_n_t_e_n_d_e_d, _t_o, _a_l_l_o_w, _s_w_a_p_p_i_n_g) the real and
     effective group IDs in set-group-ID programs to temporarily relinquish
     the set-group-ID value.  This function did not work correctly, and its
     purpose is now better served by the use of the sseetteeggiidd() function (see
     setuid(2)).

     When setting the real and effective group IDs to the same value, the
     standard sseettggiidd() function is preferred.

RREETTUURRNN VVAALLUUEESS
     Upon successful completion, a value of 0 is returned.  Otherwise, a value
     of -1 is returned and _e_r_r_n_o is set to indicate the error.

EERRRROORRSS
     [EPERM]  The current process is not the super-user and a change other
              than changing the effective group-id to the real group-id was
              specified.

SSEEEE AALLSSOO
     getgid(2),  setegid(2),  setgid(2),  setuid(2)

HHIISSTTOORRYY
     The sseettrreeggiidd function call appeared in 4.2BSD and was dropped in 4.4BSD.

4.2 Berkeley Distribution        June 2, 1993                                1