Function mmap

pub unsafe fn mmap(
    addr: Option<NonZeroUsize>,
    length: NonZeroUsize,
    prot: ProtFlags,
    flags: MapFlags,
    fd: RawFd,
    offset: off_t,
) -> Result<*mut c_void>

allocate memory, or map files or devices into memory

Safety

See the mmap(2) man page for detailed requirements.