Vmo

Struct Vmo 

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

An object representing a Zircon virtual memory object.

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

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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<T>( &self, buffer: *mut T, buffer_length: usize, offset: u64, ) -> Result<(), Status>
where T: FromBytes,

Provides a very thin wrapper over zx_vmo_read.

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

pub fn read_uninit<'a, T>( &self, data: &'a mut [MaybeUninit<T>], offset: u64, ) -> Result<&'a mut [T], Status>
where T: Copy + FromBytes,

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

Copy is required to ensure that there are no custom Drop implementations. It is difficult to correctly run custom drop code after initializing a MaybeUninit.

pub fn read_to_vec<T>(&self, offset: u64, length: u64) -> Result<Vec<T>, Status>
where T: Copy + FromBytes,

Same as read, but returns a Vec.

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

Same as read, but returns an array.

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

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.

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impl Vmo

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

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impl Vmo

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

Trait Implementations§

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impl AsHandleRef for Vmo

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fn as_handle_ref(&self) -> Unowned<'_, Handle>

Get a reference to the handle. One important use of such a reference is for object_wait_many.
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fn raw_handle(&self) -> u32

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).
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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.
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fn wait_handle( &self, signals: Signals, deadline: Instant<MonotonicTimeline>, ) -> WaitResult

Waits on a handle. Wraps the zx_object_wait_one syscall.
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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.
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fn get_name(&self) -> Result<Name, Status>

Get the Property::NAME property for this object. Read more
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fn set_name(&self, name: &Name) -> Result<(), Status>

Set the Property::NAME property for this object. Read more
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fn basic_info(&self) -> Result<HandleBasicInfo, Status>

Wraps the zx_object_get_info syscall for the ZX_INFO_HANDLE_BASIC topic.
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fn count_info(&self) -> Result<HandleCountInfo, Status>

Wraps the zx_object_get_info syscall for the ZX_INFO_HANDLE_COUNT topic.
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fn get_koid(&self) -> Result<Koid, Status>

Returns the koid (kernel object ID) for this handle.
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impl CompatFrom<Vmo> for Vmo

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fn compat_from(value: Vmo) -> Vmo

Converts value into a value of this type.
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impl Debug for Vmo

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

Formats the value using the given formatter. Read more
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impl Encodable for Vmo

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type Encoded = WireVmo

The wire type for the value.
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const COPY_OPTIMIZATION: CopyOptimization<Self, Self::Encoded> = _

Whether the conversion from Self to Self::Encoded is equivalent to copying the raw bytes of Self. Read more
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impl EncodableOption for Vmo

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type EncodedOption = WireOptionalVmo

The wire type for the optional value.
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impl<E> Encode<E> for Vmo
where E: HandleEncoder + ?Sized,

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fn encode( self, encoder: &mut E, out: &mut MaybeUninit<<Vmo as Encodable>::Encoded>, ) -> Result<(), EncodeError>

Encodes this value into an encoder and output.
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impl<E> EncodeOption<E> for Vmo
where E: HandleEncoder + ?Sized,

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fn encode_option( this: Option<Vmo>, encoder: &mut E, out: &mut MaybeUninit<<Vmo as EncodableOption>::EncodedOption>, ) -> Result<(), EncodeError>

Encodes this optional value into an encoder and output.
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impl From<Handle> for Vmo

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fn from(handle: Handle) -> Vmo

Converts to this type from the input type.
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impl From<Vmo> for Handle

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fn from(x: Vmo) -> Handle

Converts to this type from the input type.
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impl FromWire<WireVmo> for Vmo

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fn from_wire(wire: WireVmo) -> Vmo

Converts the given wire to this type.
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const COPY_OPTIMIZATION: CopyOptimization<W, Self> = _

Whether the conversion from W to Self is equivalent to copying the raw bytes of W. Read more
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impl FromWireOption<WireOptionalVmo> for Vmo

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fn from_wire_option(wire: WireOptionalVmo) -> Option<Vmo>

Converts the given wire to an option of this type.
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impl HandleBased for Vmo

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

Duplicate a handle, possibly reducing the rights available. Wraps the zx_handle_duplicate syscall.
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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.
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fn into_handle(self) -> Handle

Converts the value into its inner handle. Read more
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fn into_raw(self) -> u32

Converts the handle into it’s raw representation. Read more
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fn from_handle(handle: Handle) -> Self

Creates an instance of this type from a handle. Read more
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fn into_handle_based<H>(self) -> H
where H: HandleBased,

Creates an instance of another handle-based type from this value’s inner handle.
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fn from_handle_based<H>(h: H) -> Self
where H: HandleBased,

Creates an instance of this type from the inner handle of another handle-based type.
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fn is_invalid_handle(&self) -> bool

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impl Hash for Vmo

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

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for Vmo

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

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized,

Restrict a value to a certain interval. Read more
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impl PartialEq for Vmo

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

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

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

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

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

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

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impl StructuralPartialEq for Vmo

Auto Trait Implementations§

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impl Freeze for Vmo

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impl RefUnwindSafe for Vmo

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impl Send for Vmo

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impl Sync for Vmo

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impl Unpin for Vmo

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impl UnwindSafe for Vmo

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> EncodableAsHandle for T
where T: HandleBased,

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type Dialect = DefaultFuchsiaResourceDialect

What resource dialect can encode this object as a handle.
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impl<T, D> Encode<Ambiguous1, D> for T
where D: ResourceDialect,

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unsafe fn encode( self, _encoder: &mut Encoder<'_, D>, _offset: usize, _depth: Depth, ) -> Result<(), Error>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID. Read more
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impl<T, D> Encode<Ambiguous2, D> for T
where D: ResourceDialect,

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unsafe fn encode( self, _encoder: &mut Encoder<'_, D>, _offset: usize, _depth: Depth, ) -> Result<(), Error>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, W> FromWireOption<WireBox<'_, W>> for T
where T: FromWire<W>,

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fn from_wire_option(wire: WireBox<'_, W>) -> Option<T>

Converts the given wire to an option of this type.
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Pointable for T

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const ALIGN: usize

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<E> RunsTransport<Mpsc> for E

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impl<E> RunsTransport<Mpsc> for E
where E: RunsTransport<Mpsc>,