Function nix::sys::mman::mmap

pub fn mmap(addr: *mut c_void, length: size_t, prot: MmapProt, flags: MmapFlag, fd: RawFd, offset: off_t) -> Result<*mut c_void>

Calls to mmap are inherently unsafe, so they must be made in an unsafe block. Typically a higher-level abstraction will hide the unsafe interactions with the mmap'd region.