vntsd_read_data
if ((rv = vntsd_read_data(clientp, &c))
if ((rv = vntsd_read_data(clientp, &c)) != VNTSD_SUCCESS) {
if ((rv = vntsd_read_data(clientp, cmd)) != VNTSD_SUCCESS) {
rv = vntsd_read_data(clientp, c);
int vntsd_read_data(vntsd_client_t *clientp, char *c);