Struct Epoll 

pub struct Epoll(pub OwnedFd);

A safe wrapper around epoll.

const DATA: u64 = 17;
const MILLIS: u8 = 100;

// Create epoll
let epoll = Epoll::new(EpollCreateFlags::empty())?;

// Create eventfd & Add event
let eventfd = EventFd::new()?;
epoll.add(&eventfd, EpollEvent::new(EpollFlags::EPOLLIN,DATA))?;

// Arm eventfd & Time wait
eventfd.write(1)?;
let now = Instant::now();

// Wait on event
let mut events = [EpollEvent::empty()];
epoll.wait(&mut events, MILLIS)?;

// Assert data correct & timeout didn't occur
assert_eq!(events[0].data(), DATA);
assert!(now.elapsed().as_millis() < MILLIS.into());

Tuple Fields

0: OwnedFd

Implementations

impl Epoll

pub fn new(flags: EpollCreateFlags) -> Result<Self>

Creates a new epoll instance and returns a file descriptor referring to that instance.

epoll_create1.

pub fn add<Fd: AsFd>(&self, fd: Fd, event: EpollEvent) -> Result<()>

Add an entry to the interest list of the epoll file descriptor for specified in events.

epoll_ctl with EPOLL_CTL_ADD.

pub fn delete<Fd: AsFd>(&self, fd: Fd) -> Result<()>

Remove (deregister) the target file descriptor fd from the interest list.

epoll_ctl with EPOLL_CTL_DEL .

pub fn modify<Fd: AsFd>(&self, fd: Fd, event: &mut EpollEvent) -> Result<()>

Change the settings associated with fd in the interest list to the new settings specified in event.

epoll_ctl with EPOLL_CTL_MOD.

pub fn wait<T: Into<EpollTimeout>>( &self, events: &mut [EpollEvent], timeout: T, ) -> Result<usize>

Waits for I/O events, blocking the calling thread if no events are currently available. (This can be thought of as fetching items from the ready list of the epoll instance.)

epoll_wait

fn epoll_ctl<'a, Fd: AsFd, T>( &self, op: EpollOp, fd: Fd, event: T, ) -> Result<()>

where T: Into<Option<&'a mut EpollEvent>>,

This system call is used to add, modify, or remove entries in the interest list of the epoll instance referred to by self. It requests that the operation op be performed for the target file descriptor, fd.

When possible prefer Epoll::add, Epoll::delete and Epoll::modify.

epoll_ctl

Trait Implementations

impl Debug for Epoll

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

Formats the value using the given formatter.