setresgid

/*
 *  call-seq:
 *     Process::Sys.setresgid(rid, eid, sid)   => nil
 *
 *  Sets the (integer) real, effective, and saved user IDs of the
 *  current process to <em>rid</em>, <em>eid</em>, and <em>sid</em>
 *  respectively. A value of <code>-1</code> for any value means to
 *  leave that ID unchanged. Not available on all platforms.
 *
 */

static VALUE
p_sys_setresgid(obj, rid, eid, sid)
    VALUE obj, rid, eid, sid;
{
#if defined HAVE_SETRESGID
    check_gid_switch();
    if (setresgid(NUM2INT(rid),NUM2INT(eid),NUM2INT(sid)) != 0) rb_sys_fail(0);
#else
    rb_notimplement();
#endif
    return Qnil;
}