Struct EventFd

pub struct EventFd { /* private fields */ }

A safe wrapper around a Linux eventfd (man 2 eventfd).

An eventfd is useful because it is sendable across processes and can be used for signaling in and out of the KVM API. They can also be polled like any other file descriptor.

Implementations

impl EventFd

pub fn new() -> Result<EventFd>

Creates a new blocking EventFd with an initial value of 0.

pub fn write(&self, v: u64) -> Result<()>

Adds v to the eventfd’s count, blocking until this won’t overflow the count.

pub fn read(&self) -> Result<u64>

Blocks until the the eventfd’s count is non-zero, then resets the count to zero.

pub fn try_clone(&self) -> Result<EventFd>

Clones this EventFd, internally creating a new file descriptor. The new EventFd will share the same underlying count within the kernel.

Trait Implementations

impl AsRawFd for EventFd

fn as_raw_fd(&self) -> RawFd

Extracts the raw file descriptor.

impl Debug for EventFd

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

Formats the value using the given formatter.

impl FromRawFd for EventFd

unsafe fn from_raw_fd(fd: RawFd) -> Self

Constructs a new instance of Self from the given raw file descriptor.

impl IntoRawFd for EventFd

fn into_raw_fd(self) -> RawFd

Consumes this object, returning the raw underlying file descriptor.