M_CTL_MAGIC_NUMBER
*newmp->b_wptr++ = M_CTL_MAGIC_NUMBER;
*newmp->b_wptr++ = M_CTL_MAGIC_NUMBER;
if ((MBLKL(mp) == 1) && (*mp->b_rptr == M_CTL_MAGIC_NUMBER)) {
(*mp->b_rptr == M_CTL_MAGIC_NUMBER)) {
*(newmp->b_rptr) = M_CTL_MAGIC_NUMBER;
*(newmp->b_rptr) = M_CTL_MAGIC_NUMBER;
*(newmp->b_rptr) = M_CTL_MAGIC_NUMBER;
(*(mp->b_rptr) == M_CTL_MAGIC_NUMBER)) {
(*(mp->b_rptr) == M_CTL_MAGIC_NUMBER)) {