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#![allow(dead_code)]
use std::io;
use std::result;
use std::time::Duration;
use libc::{
self, c_int, c_void, EFD_NONBLOCK, EFD_SEMAPHORE, EPOLL_CTL_ADD, EPOLL_CTL_DEL, EPOLL_CTL_MOD,
};
pub use libc::{epoll_event, EPOLLERR, EPOLLET, EPOLLIN, EPOLLONESHOT, EPOLLOUT, EPOLLPRI};
pub type Result<T> = result::Result<T, io::Error>;
#[derive(Debug)]
pub struct EventFd {
fd: i32,
}
impl EventFd {
pub fn new() -> Result<EventFd> {
Ok(EventFd {
fd: parse_retval!(unsafe { libc::eventfd(0, EFD_NONBLOCK | EFD_SEMAPHORE) })?,
})
}
pub fn notify(&self) -> Result<()> {
let buffer: u64 = 1;
parse_retval!(unsafe { libc::write(self.fd, &buffer as *const u64 as *const c_void, 8) })?;
Ok(())
}
pub fn fd(&self) -> i32 {
self.fd
}
}
impl Drop for EventFd {
fn drop(&mut self) {
unsafe {
libc::close(self.fd);
}
}
}
#[derive(Debug)]
pub struct Epoll {
fd: c_int,
}
impl Epoll {
pub fn new() -> Result<Epoll> {
Ok(Epoll {
fd: parse_retval!(unsafe { libc::epoll_create1(0) })?,
})
}
pub fn add(&self, fd: i32, id: u64, event_mask: i32) -> Result<()> {
let mut event = epoll_event {
events: event_mask as u32,
u64: id as u64,
};
parse_retval!(unsafe { libc::epoll_ctl(self.fd, EPOLL_CTL_ADD, fd, &mut event) })?;
Ok(())
}
pub fn modify(&self, fd: i32, id: u64, event_mask: i32) -> Result<()> {
let mut event = epoll_event {
events: event_mask as u32,
u64: id as u64,
};
parse_retval!(unsafe { libc::epoll_ctl(self.fd, EPOLL_CTL_MOD, fd, &mut event) })?;
Ok(())
}
pub fn delete(&self, fd: i32) -> Result<()> {
let mut event = epoll_event { events: 0, u64: 0 };
parse_retval!(unsafe { libc::epoll_ctl(self.fd, EPOLL_CTL_DEL, fd, &mut event) })?;
Ok(())
}
pub fn wait(&self, events: &mut [epoll_event], timeout: Option<Duration>) -> Result<usize> {
if events.is_empty() {
return Ok(0);
}
let timeout = if let Some(duration) = timeout {
(duration.as_secs() * 1_000 + u64::from(duration.subsec_millis())) as c_int
} else {
-1
};
Ok(parse_retval!(unsafe {
libc::epoll_wait(self.fd, events.as_mut_ptr(), events.len() as c_int, timeout)
})? as usize)
}
}
impl Drop for Epoll {
fn drop(&mut self) {
unsafe {
libc::close(self.fd);
}
}
}