Feature or enhancement

Proposal:

The following MAP_* flags are defined on macOS, but are not exposed in the module mmap:

• MAP_NORESERVE
• MAP_NOEXTEND
• MAP_HASSEMAPHORE
• MAP_NOCACHE
• MAP_JIT
• MAP_RESILIENT_CODESIGN
• MAP_RESILIENT_MEDIA
• MAP_32BIT
• MAP_TRANSLATED_ALLOW_EXECUTE
• MAP_UNIX03
• MAP_TPRO

The system also defines MAP_COPY, MAP_RENAME, but those seem to be less useful. MAP_FILE and MAP_FIXED are generic flags that aren't useful for module mmap.

This is based on the macOS 14.2 SDK.

Two other things I noticed, but something for different issues:

• There's a comment about msync(2) flags in the implementation for mmap.mmap.flush()
• There is no way to change the memory protection (PROT_READ etc.) after creating the mapping, exposing such functionality could be useful for using mmap to write executable code in Python.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-113868: Add a number of MAP_* flags from macOS to module mmap #113869