mmap-go is a portable mmap package for the Go programming language.
This package is tested using GitHub Actions on Linux, macOS, and Windows. It should also work on other Unix-like platforms, but hasn't been tested with them. I'm interested to hear about the results.
This package compiles for Plan 9 and WebAssembly, but its functions always return errors.
Related functions such as mprotect and mincore aren't included. I haven't found a way to implement them on Windows without introducing significant complexity. If you're running on a Unix-like platform and really need these features, it should still be possible to implement them on top of this package via syscall.