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#![cfg(any(target_os = "android", target_os = "linux"))]
use rustix::fd::AsFd;
use rustix::io::epoll::{self, Epoll};
use rustix::io::{ioctl_fionbio, read, write, OwnedFd};
use rustix::net::{
accept, bind_v4, connect_v4, getsockname, listen, socket, AddressFamily, Ipv4Addr, Protocol,
SocketAddrAny, SocketAddrV4, SocketType,
};
use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
use std::sync::{Arc, Condvar, Mutex};
use std::thread;
const BUFFER_SIZE: usize = 20;
fn server(ready: Arc<(Mutex<u16>, Condvar)>) {
let listen_sock = socket(AddressFamily::INET, SocketType::STREAM, Protocol::default()).unwrap();
bind_v4(&listen_sock, &SocketAddrV4::new(Ipv4Addr::LOCALHOST, 0)).unwrap();
listen(&listen_sock, 1).unwrap();
let who = match getsockname(&listen_sock).unwrap() {
SocketAddrAny::V4(addr) => addr,
_ => panic!(),
};
{
let (lock, cvar) = &*ready;
let mut port = lock.lock().unwrap();
*port = who.port();
cvar.notify_all();
}
let epoll = Epoll::new(epoll::CreateFlags::CLOEXEC, epoll::Owning::<OwnedFd>::new()).unwrap();
// Test into conversions.
let fd: OwnedFd = epoll.into();
let epoll: Epoll<epoll::Owning<OwnedFd>> = fd.into();
let fd: RawFd = epoll.into_raw_fd();
let epoll = unsafe { Epoll::<epoll::Owning<OwnedFd>>::from_raw_fd(fd) };
let raw_listen_sock = listen_sock.as_fd().as_raw_fd();
epoll.add(listen_sock, epoll::EventFlags::IN).unwrap();
let mut event_list = epoll::EventVec::with_capacity(4);
loop {
epoll.wait(&mut event_list, -1).unwrap();
for (_event_flags, target) in &event_list {
if target.as_raw_fd() == raw_listen_sock {
let conn_sock = accept(&*target).unwrap();
ioctl_fionbio(&conn_sock, true).unwrap();
epoll
.add(conn_sock, epoll::EventFlags::OUT | epoll::EventFlags::ET)
.unwrap();
} else {
write(&*target, b"hello\n").unwrap();
let _ = epoll.del(target).unwrap();
}
}
}
}
fn client(ready: Arc<(Mutex<u16>, Condvar)>) {
let port = {
let (lock, cvar) = &*ready;
let mut port = lock.lock().unwrap();
while *port == 0 {
port = cvar.wait(port).unwrap();
}
*port
};
let addr = SocketAddrV4::new(Ipv4Addr::LOCALHOST, port);
let mut buffer = vec![0; BUFFER_SIZE];
for _ in 0..16 {
let data_socket =
socket(AddressFamily::INET, SocketType::STREAM, Protocol::default()).unwrap();
connect_v4(&data_socket, &addr).unwrap();
let nread = read(&data_socket, &mut buffer).unwrap();
assert_eq!(String::from_utf8_lossy(&buffer[..nread]), "hello\n");
}
}
#[test]
fn test_epoll() {
let ready = Arc::new((Mutex::new(0_u16), Condvar::new()));
let ready_clone = Arc::clone(&ready);
let _server = thread::Builder::new()
.name("server".to_string())
.spawn(move || {
server(ready);
})
.unwrap();
let client = thread::Builder::new()
.name("client".to_string())
.spawn(move || {
client(ready_clone);
})
.unwrap();
client.join().unwrap();
}
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