| Value | Meaning |
|---|---|
| None0 | no flag |
| KeepMapped1 | once the memory is mapped, keep it mapped until the memory is destroyed. |
| MapPrivate2 | do a private mapping instead of the default shared mapping. |
| DontClose4 | don't close the file descriptor when the memory is freed. Since: 1.10 |
Various flags to control the operation of the fd backed memory.