mirror of https://github.com/dswd/vpncloud.git
70 lines
2.1 KiB
Rust
70 lines
2.1 KiB
Rust
// VpnCloud - Peer-to-Peer VPN
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// Copyright (C) 2015-2021 Dennis Schwerdel
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// This software is licensed under GPL-3 or newer (see LICENSE.md)
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use std::{io, os::unix::io::RawFd};
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use super::WaitResult;
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pub struct EpollWait {
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poll_fd: RawFd,
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event: libc::epoll_event,
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socket: RawFd,
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device: RawFd,
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timeout: u32,
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}
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impl EpollWait {
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pub fn new(socket: RawFd, device: RawFd, timeout: u32) -> io::Result<Self> {
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Self::create(socket, device, timeout, libc::EPOLLIN as u32)
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}
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pub fn testing(socket: RawFd, device: RawFd, timeout: u32) -> io::Result<Self> {
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Self::create(socket, device, timeout, (libc::EPOLLIN | libc::EPOLLOUT) as u32)
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}
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fn create(socket: RawFd, device: RawFd, timeout: u32, flags: u32) -> io::Result<Self> {
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let mut event = libc::epoll_event { u64: 0, events: 0 };
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let poll_fd = unsafe { libc::epoll_create(3) };
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if poll_fd == -1 {
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return Err(io::Error::last_os_error());
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}
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for fd in &[socket, device] {
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event.u64 = *fd as u64;
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event.events = flags;
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let res = unsafe { libc::epoll_ctl(poll_fd, libc::EPOLL_CTL_ADD, *fd, &mut event) };
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if res == -1 {
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return Err(io::Error::last_os_error());
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}
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}
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Ok(Self { poll_fd, event, socket, device, timeout })
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}
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}
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impl Drop for EpollWait {
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fn drop(&mut self) {
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unsafe { libc::close(self.poll_fd) };
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}
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}
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impl Iterator for EpollWait {
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type Item = WaitResult;
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fn next(&mut self) -> Option<Self::Item> {
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Some(match unsafe { libc::epoll_wait(self.poll_fd, &mut self.event, 1, self.timeout as i32) } {
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-1 => WaitResult::Error(io::Error::last_os_error()),
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0 => WaitResult::Timeout,
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1 => {
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if self.event.u64 == self.socket as u64 {
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WaitResult::Socket
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} else if self.event.u64 == self.device as u64 {
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WaitResult::Device
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} else {
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unreachable!()
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}
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}
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_ => unreachable!(),
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})
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}
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}
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