Struct wasmer_sys_utils::memory::fd_memory::fd_mmap::FdMmap

pub struct FdMmap {
    ptr: usize,
    len: usize,
    fd: FdGuard,
}

A simple struct consisting of a page-aligned pointer to page-aligned and initially-zeroed memory and a length.

Fields

ptr: usize

len: usize

fd: FdGuard

Implementations

impl FdMmap

pub fn new() -> Self

Construct a new empty instance of Mmap.

pub fn accessible_reserved( accessible_size: usize, mapping_size: usize, ) -> Result<Self, String>

Create a new Mmap pointing to accessible_size bytes of page-aligned accessible memory, within a reserved mapping of mapping_size bytes. accessible_size and mapping_size must be native page-size multiples.

pub fn make_accessible( &mut self, start: usize, len: usize, ) -> Result<(), String>

Make the memory starting at start and extending for len bytes accessible. start and len must be native page-size multiples and describe a range within self’s reserved memory.

pub fn as_slice(&self) -> &[u8]

Return the allocated memory as a slice of u8.

pub fn as_mut_slice(&mut self) -> &mut [u8]

Return the allocated memory as a mutable slice of u8.

pub fn as_mut_ptr(&mut self) -> *mut u8

Return the allocated memory as a mutable pointer to u8.

pub fn len(&self) -> usize

Return the length of the allocated memory.

pub fn duplicate(&mut self, hint_used: Option<usize>) -> Result<Self, String>

Copies the memory to a new swap file (using copy-on-write if available)

Trait Implementations

impl Debug for FdMmap

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Drop for FdMmap

fn drop(&mut self)

Executes the destructor for this type.