Struct Vmo

pub struct Vmo(/* private fields */);

An object representing a Zircon virtual memory object.

As essentially a subtype of Handle, it can be freely interconverted.

Implementations

impl Vmo

pub fn create(size: u64) -> Result<Vmo, Status>

Create a virtual memory object.

Wraps the zx_vmo_create syscall. See the Shared Memory: Virtual Memory Objects (VMOs) for more information.

pub fn create_with_opts(opts: VmoOptions, size: u64) -> Result<Vmo, Status>

Create a virtual memory object with options.

Wraps the zx_vmo_create syscall, allowing options to be passed.

pub fn create_contiguous( bti: &Bti, size: usize, alignment_log2: u32, ) -> Result<Vmo, Status>

Create a physically contiguous virtual memory object.

Wraps the zx_vmo_create_contiguous syscall.

pub fn read(&self, data: &mut [u8], offset: u64) -> Result<(), Status>

Read from a virtual memory object.

Wraps the zx_vmo_read syscall.

pub unsafe fn read_raw( &self, buffer: *mut u8, buffer_length: usize, offset: u64, ) -> Result<(), Status>

Provides the thinest wrapper possible over zx_vmo_read.

Safety

Callers must guarantee that the buffer is valid to write to.

pub fn read_uninit<'a>( &self, data: &'a mut [MaybeUninit<u8>], offset: u64, ) -> Result<&'a mut [u8], Status>

Same as read, but reads into memory that might not be initialized, returning an initialized slice of bytes on success.

pub fn read_to_vec(&self, offset: u64, length: u64) -> Result<Vec<u8>, Status>

Same as read, but returns a Vec.

pub fn read_to_array<T: FromBytes, const N: usize>( &self, offset: u64, ) -> Result<[T; N], Status>

Same as read, but returns an array.

pub fn read_to_object<T: FromBytes>(&self, offset: u64) -> Result<T, Status>

Same as read, but returns a T.

pub fn write(&self, data: &[u8], offset: u64) -> Result<(), Status>

Write to a virtual memory object.

Wraps the zx_vmo_write syscall.

pub fn transfer_data( &self, options: TransferDataOptions, offset: u64, length: u64, src_vmo: &Vmo, src_offset: u64, ) -> Result<(), Status>

Efficiently transfers data from one VMO to another.

pub fn get_size(&self) -> Result<u64, Status>

Get the size of a virtual memory object.

Wraps the zx_vmo_get_size syscall.

pub fn set_size(&self, size: u64) -> Result<(), Status>

Attempt to change the size of a virtual memory object.

Wraps the zx_vmo_set_size syscall.

pub fn get_stream_size(&self) -> Result<u64, Status>

Get the stream size of a virtual memory object.

Wraps the zx_vmo_get_stream_size syscall.

pub fn set_stream_size(&self, size: u64) -> Result<(), Status>

Attempt to set the stream size of a virtual memory object.

Wraps the zx_vmo_set_stream_size syscall.

pub fn set_cache_policy(&self, cache_policy: CachePolicy) -> Result<(), Status>

Attempt to change the cache policy of a virtual memory object.

Wraps the zx_vmo_set_cache_policy syscall.

pub fn op_range(&self, op: VmoOp, offset: u64, size: u64) -> Result<(), Status>

Perform an operation on a range of a virtual memory object.

Wraps the zx_vmo_op_range syscall.

pub fn info(&self) -> Result<VmoInfo, Status>

Wraps the zx_object_get_info syscall for the ZX_INFO_VMO topic.

pub fn create_child( &self, opts: VmoChildOptions, offset: u64, size: u64, ) -> Result<Vmo, Status>

Create a new virtual memory object that clones a range of this one.

Wraps the zx_vmo_create_child syscall.

pub fn replace_as_executable(self, vmex: &Resource) -> Result<Vmo, Status>

Replace a VMO, adding execute rights.

Wraps the zx_vmo_replace_as_executable syscall.

impl Vmo

pub fn get_content_size(&self) -> Result<u64, Status>

impl Vmo

pub fn set_content_size(&self, val: &u64) -> Result<(), Status>

Trait Implementations

impl AsHandleRef for Vmo

fn as_handle_ref(&self) -> HandleRef<'_>

Get a reference to the handle. One important use of such a reference is for object_wait_many.

fn raw_handle(&self) -> zx_handle_t

Interpret the reference as a raw handle (an integer type). Two distinct handles will have different raw values (so it can perhaps be used as a key in a data structure).

fn signal_handle( &self, clear_mask: Signals, set_mask: Signals, ) -> Result<(), Status>

Set and clear userspace-accessible signal bits on an object. Wraps the zx_object_signal syscall.

fn wait_handle( &self, signals: Signals, deadline: MonotonicInstant, ) -> Result<Signals, Status>

Waits on a handle. Wraps the zx_object_wait_one syscall.

fn wait_async_handle( &self, port: &Port, key: u64, signals: Signals, options: WaitAsyncOpts, ) -> Result<(), Status>

Causes packet delivery on the given port when the object changes state and matches signals. zx_object_wait_async syscall.

fn get_name(&self) -> Result<Name, Status>

Get the Property::NAME property for this object.

fn set_name(&self, name: &Name) -> Result<(), Status>

Set the Property::NAME property for this object.

fn basic_info(&self) -> Result<HandleBasicInfo, Status>

Wraps the zx_object_get_info syscall for the ZX_INFO_HANDLE_BASIC topic.

fn count_info(&self) -> Result<HandleCountInfo, Status>

Wraps the zx_object_get_info syscall for the ZX_INFO_HANDLE_COUNT topic.

fn get_koid(&self) -> Result<Koid, Status>

Returns the koid (kernel object ID) for this handle.

impl Debug for Vmo

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

Formats the value using the given formatter.

impl From<Handle> for Vmo

fn from(handle: Handle) -> Self

Converts to this type from the input type.

impl From<Vmo> for Handle

fn from(x: Vmo) -> Handle

Converts to this type from the input type.

impl HandleBased for Vmo

fn duplicate_handle(&self, rights: Rights) -> Result<Self, Status>

Duplicate a handle, possibly reducing the rights available. Wraps the zx_handle_duplicate syscall.

fn replace_handle(self, rights: Rights) -> Result<Self, Status>

Create a replacement for a handle, possibly reducing the rights available. This invalidates the original handle. Wraps the zx_handle_replace syscall.

fn into_handle(self) -> Handle

Converts the value into its inner handle.

fn into_raw(self) -> zx_handle_t

Converts the handle into it’s raw representation.

fn from_handle(handle: Handle) -> Self

Creates an instance of this type from a handle.

fn into_handle_based<H: HandleBased>(self) -> H

Creates an instance of another handle-based type from this value’s inner handle.

fn from_handle_based<H: HandleBased>(h: H) -> Self

Creates an instance of this type from the inner handle of another handle-based type.

fn is_invalid_handle(&self) -> bool

impl Hash for Vmo

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Vmo

fn cmp(&self, other: &Vmo) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Vmo

fn eq(&self, other: &Vmo) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Vmo

fn partial_cmp(&self, other: &Vmo) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for Vmo

impl StructuralPartialEq for Vmo