Struct std::os::fd::BorrowedFd

1.63.0 · source ·
pub struct BorrowedFd<'fd> { /* private fields */ }
Expand description

A borrowed file descriptor.

This has a lifetime parameter to tie it to the lifetime of something that owns the file descriptor. For the duration of that lifetime, it is guaranteed that nobody will close the file descriptor.

This uses repr(transparent) and has the representation of a host file descriptor, so it can be used in FFI in places where a file descriptor is passed as an argument, it is not captured or consumed, and it never has the value -1.

This type does not have a ToOwned implementation. Calling .to_owned() on a variable of this type will call it on &BorrowedFd and use Clone::clone() like ToOwned does for all types implementing Clone. The result will be descriptor borrowed under the same lifetime.

To obtain an OwnedFd, you can use BorrowedFd::try_clone_to_owned instead, but this is not supported on all platforms.

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impl BorrowedFd<'_>

1.63.0 (const: 1.63.0) · source

pub const unsafe fn borrow_raw(fd: RawFd) -> Self

Returns a BorrowedFd holding the given raw file descriptor.

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The resource pointed to by fd must remain open for the duration of the returned BorrowedFd, and it must not have the value -1.

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impl BorrowedFd<'_>

1.63.0 · source

pub fn try_clone_to_owned(&self) -> Result<OwnedFd>

Creates a new OwnedFd instance that shares the same underlying file description as the existing BorrowedFd instance.

Trait Implementations§

1.63.0 · source§

impl AsFd for BorrowedFd<'_>

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fn as_fd(&self) -> BorrowedFd<'_>

Borrows the file descriptor. Read more
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impl AsRawFd for BorrowedFd<'_>

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fn as_raw_fd(&self) -> RawFd

Extracts the raw file descriptor. Read more
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impl<'fd> Clone for BorrowedFd<'fd>

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fn clone(&self) -> BorrowedFd<'fd>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for BorrowedFd<'_>

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

Formats the value using the given formatter. Read more
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impl IsTerminal for BorrowedFd<'_>

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fn is_terminal(&self) -> bool

Returns true if the descriptor/handle refers to a terminal/tty. Read more
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impl<'fd> Copy for BorrowedFd<'fd>

Auto Trait Implementations§

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impl<'fd> Freeze for BorrowedFd<'fd>

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impl<'fd> RefUnwindSafe for BorrowedFd<'fd>

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impl<'fd> Send for BorrowedFd<'fd>

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impl<'fd> Sync for BorrowedFd<'fd>

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impl<'fd> Unpin for BorrowedFd<'fd>

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impl<'fd> UnwindSafe for BorrowedFd<'fd>

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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit #126799)
Performs copy-assignment from self to dst. 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, 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> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. 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.