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PollFd

Struct PollFd 

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pub struct PollFd<'fd> { /* private fields */ }
Expand description

Vue d’une entrée struct pollfd du kernel : un descripteur emprunté, les events surveillés et les revents rendus par ppoll(2).

Aucune prise d’ownership : le fd est un BorrowedFd (+0). L’appelant reste seul propriétaire et garde la responsabilité de sa fermeture.

Représentation ABI. Le type est #[repr(C)] avec exactement la disposition de struct pollfd (int fd; short events; short revents; — 8 octets, alignement 4). C’est ce qui permet à ppoll de prendre la slice de l’appelant directement, sans allocation ni copie (Principe 4). Les champs events/revents du kernel sont des short (16 bits) : tous les drapeaux PollEvents définis tiennent dans ces 16 bits (RDHUP = 0x2000 est le plus haut). La surface publique reste typée PollEvents via Self::new, Self::events et Self::revents ; la nature 16 bits est un détail interne fidèle au kernel.

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impl<'fd> PollFd<'fd>

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pub fn new(fd: BorrowedFd<'fd>, events: PollEvents) -> Self

Construit une entrée de surveillance pour fd et les events demandés.

revents est vide à la construction ; il sera rempli par le kernel au retour de ppoll.

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

Descripteur emprunté surveillé par cette entrée.

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pub fn events(&self) -> PollEvents

Événements demandés (tels que passés à Self::new).

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pub fn revents(&self) -> PollEvents

Événements signalés par le kernel après ppoll (vide si non prêt).

Restitution intégrale de l’information du kernel (ADR-032) : tous les bits rendus sont conservés, y compris ceux non modélisés par une constante (from_bits_retain).

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impl<'fd> Clone for PollFd<'fd>

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

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'fd> Copy for PollFd<'fd>

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impl<'fd> Debug for PollFd<'fd>

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<'fd> Freeze for PollFd<'fd>

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impl<'fd> RefUnwindSafe for PollFd<'fd>

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impl<'fd> Send for PollFd<'fd>

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impl<'fd> Sync for PollFd<'fd>

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impl<'fd> Unpin for PollFd<'fd>

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impl<'fd> UnsafeUnpin for PollFd<'fd>

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impl<'fd> UnwindSafe for PollFd<'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, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. 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.