virtio_driver/util/
eventfd.rs

1// SPDX-License-Identifier: (MIT OR Apache-2.0)
2
3use rustix::event::eventfd;
4pub use rustix::event::EventfdFlags;
5use rustix::fd::{AsFd, BorrowedFd, OwnedFd};
6use rustix::io::{read, write};
7use std::io::Error;
8use std::os::unix::io::{AsRawFd, RawFd};
9
10#[derive(Debug)]
11pub struct EventFd {
12    fd: OwnedFd,
13}
14
15impl EventFd {
16    #[allow(dead_code)] // unused when virtio-driver is build with no features enabled
17    pub(crate) fn new(flags: EventfdFlags) -> Result<Self, Error> {
18        let fd = eventfd(0, flags)?;
19        Ok(EventFd { fd })
20    }
21
22    pub fn read(&self) -> Result<u64, Error> {
23        let mut buf = [0u8; 8];
24
25        read(&self.fd, &mut buf)?;
26
27        Ok(u64::from_ne_bytes(buf))
28    }
29
30    pub fn write(&self, val: u64) -> Result<(), Error> {
31        let buf = val.to_ne_bytes();
32
33        write(&self.fd, &buf)?;
34
35        Ok(())
36    }
37}
38
39impl AsFd for EventFd {
40    fn as_fd(&self) -> BorrowedFd {
41        self.fd.as_fd()
42    }
43}
44
45impl AsRawFd for EventFd {
46    fn as_raw_fd(&self) -> RawFd {
47        self.fd.as_raw_fd()
48    }
49}
virtio_driver/util/eventfd.rs

virtio_driver/util/
eventfd.rs
