shmem_create_from_data
shmem_state = shmem_create_from_data(ce->engine->name,
file = shmem_create_from_data("", ptr, obj->base.size);
struct file *shmem_create_from_data(const char *name, void *data, size_t len);
file = shmem_create_from_data("mock", &datum, sizeof(datum));