MODCTL_EXISTS
if (prog_modctl(MODCTL_EXISTS, (void *)(uintptr_t)1)) {
if (prog_modctl(MODCTL_EXISTS, (void *)(uintptr_t)0)) {
case MODCTL_EXISTS:
case MODCTL_EXISTS:
err = modctl(MODCTL_EXISTS, 0);
err = modctl(MODCTL_EXISTS, 0);