---
title: rt_msghdr_prelude
framework: Kernel
role: symbol
platforms: [macOS 15.0+]
path: kernel/rt_msghdr_prelude
---

# rt_msghdr_prelude

## Declaration

```occ
struct rt_msghdr_prelude {
    ...
};
```

## Topics

### Instance Properties

- [rtm_msglen](kernel/rt_msghdr_prelude/4460360-rtm_msglen.md)