vdc_send
static int vdc_send(vdc_t *vdc, caddr_t pkt, size_t *msglen);
status = vdc_send(vdc, (caddr_t)&pkt, &msglen);
status = vdc_send(vdc, (caddr_t)&pkt, &msglen);
status = vdc_send(vdc, (caddr_t)&pkt, &msglen);
status = vdc_send(vdcp, (caddr_t)&msg, &msglen);
rv = vdc_send(vdcp, (caddr_t)&dmsg, &msglen);
status = vdc_send(vdc, (caddr_t)ver_msg, &len);