bsd/kern/uipc_mbuf.c

1250 	mbstat.m_mlen = MLEN;
3255 		bzero(MTOD(m, caddr_t), MLEN);
4337 	return (&m->m_dat[MLEN] - (m->m_data + m->m_len));
4649 		    m->m_data + m->m_len + n->m_len >= &m->m_dat[MLEN]) {
4758 	    n->m_data + len < &n->m_dat[MLEN] && n->m_next) {
4776 	space = &m->m_dat[MLEN] - (m->m_data + m->m_len);
4826 	space = &m->m_dat[MLEN] - (m->m_data + m->m_len);
4957 			m->m_len = MLEN;
5345 				    (n->m_flags & M_EXT) ? MCLBYTES : MLEN;
5470 		} else if (m->m_len <= MLEN) {
5666 		n->m_len = min(MLEN, remainder);
5773 			if (length > MLEN)