FreeBSD mmap function allows users to modify append-only or immutable files.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Bsd_os | Bsdi | 3.0 (including) | 3.0 (including) |
| Freebsd | Freebsd | 2.2 (including) | 2.2 (including) |
| Netbsd | Netbsd | 2.0.4 (including) | 2.0.4 (including) |
| Openbsd | Openbsd | 2.2 (including) | 2.2 (including) |