int rv = vac_connect("vac_client", NULL, wrap_vac_callback, 32 /* rx queue-length*/);
if (rv != 0) {
printf("Connect failed: %d\n", rv);
int rv = vac_connect("vac_client", NULL, wrap_vac_callback, 32 /* rx queue-length*/);
if (rv != 0) {
printf("Connect failed: %d\n", rv);