setresuid

/*
 *  call-seq:
 *     Process::Sys.setresuid(rid, eid, sid)   => nil
 *
 *  Sets the (integer) real, effective, and saved user IDs of the
 *  current process to _rid_, _eid_, and _sid_ 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_setresuid(obj, rid, eid, sid)
    VALUE obj, rid, eid, sid;
{
#if defined HAVE_SETRESUID
    check_uid_switch();
    if (setresuid(NUM2INT(rid),NUM2INT(eid),NUM2INT(sid)) != 0) rb_sys_fail(0);
#else
    rb_notimplement();
#endif
    return Qnil;
}