Struct kernel::file::File

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#[repr(transparent)]
pub struct File(_);

Expand description

Wraps the kernel’s struct file.

Invariants

Instances of this type are always ref-counted, that is, a call to get_file ensures that the allocation remains valid at least until the matching call to fput.

Implementations

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impl File

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pub fn from_fd(fd: u32) -> Result<ARef<Self>>

Constructs a new [struct file] wrapper from a file descriptor.

The file descriptor belongs to the current process.

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pub fn pos(&self) -> u64

Returns the current seek/cursor/pointer position (struct file::f_pos).

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pub fn cred(&self) -> &Credential

Returns the credentials of the task that originally opened the file.

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pub fn flags(&self) -> u32

Returns the flags associated with the file.

The flags are a combination of the constants in flags.

Trait Implementations

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impl AlwaysRefCounted for File

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fn inc_ref(&self)

Increments the reference count on the object.

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unsafe fn dec_ref(obj: NonNull<Self>)

Decrements the reference count on the object. Read more

Auto Trait Implementations

impl !RefUnwindSafe for File

impl !Send for File

impl !Sync for File

impl Unpin for File

impl UnwindSafe for File

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,

const: unstable · source

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,

const: unstable · source

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

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T where
U: From<T>,

const: unstable · source

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, U> TryFrom for T where
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

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impl<T, U> TryInto for T where
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

Struct kernel::file::File

Invariants

Implementations

impl File

pub fn from_fd(fd: u32) -> Result<ARef<Self>>

pub fn pos(&self) -> u64

pub fn cred(&self) -> &Credential

pub fn flags(&self) -> u32

Trait Implementations

impl AlwaysRefCounted for File

fn inc_ref(&self)

unsafe fn dec_ref(obj: NonNull<Self>)

Auto Trait Implementations

impl !RefUnwindSafe for File

impl !Send for File

impl !Sync for File

impl Unpin for File

impl UnwindSafe for File

Blanket Implementations

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

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where
T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where
T: ?Sized,

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

impl<T> From<T> for T

fn from(t: T) -> T

impl<T, U> Into<U> for T where
U: From<T>,

fn into(self) -> U

impl<T, U> TryFrom<U> for T where
U: Into<T>,

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

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

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Struct kernel::file::File

Invariants

Implementations

impl File

pub fn from_fd(fd: u32) -> Result<ARef<Self>>

pub fn pos(&self) -> u64

pub fn cred(&self) -> &Credential

pub fn flags(&self) -> u32

Trait Implementations

impl AlwaysRefCounted for File

fn inc_ref(&self)

unsafe fn dec_ref(obj: NonNull<Self>)

Auto Trait Implementations

impl !RefUnwindSafe for File

impl !Send for File

impl !Sync for File

impl Unpin for File

impl UnwindSafe for File

Blanket Implementations

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

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where T: ?Sized,

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

impl<T> From<T> for T

fn from(t: T) -> T

impl<T, U> Into<U> for T where U: From<T>,

fn into(self) -> U

impl<T, U> TryFrom<U> for T where U: Into<T>,

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for T where U: TryFrom<T>,

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

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

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

impl<T> Borrow<T> for T where
T: ?Sized,

impl<T> BorrowMut<T> for T where
T: ?Sized,

impl<T, U> Into<U> for T where
U: From<T>,

impl<T, U> TryFrom<U> for T where
U: Into<T>,

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,