Handle fd = {._0 = 1};
        FfiByteSlice buffer = {.data = (const uint8_t *)ptr, .data_len = len};
        FfiResult_____c_void result = g_api->write(fd, buffer);
```

```rust
extern "C" fn api_write(
    fd: neotron_api::file::Handle,
    buffer: neotron_api::FfiByteSlice,
) -> neotron_api::Result<()> {