forked from tokio-rs/tokio
/
named-pipe-ready.rs
107 lines (84 loc) · 2.9 KB
/
named-pipe-ready.rs
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use std::io;
#[cfg(windows)]
async fn windows_main() -> io::Result<()> {
use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader, Interest};
use tokio::net::windows::named_pipe::{ClientOptions, ServerOptions};
const PIPE_NAME: &str = r"\\.\pipe\named-pipe-single-client";
let server = ServerOptions::new().create(PIPE_NAME)?;
let server = tokio::spawn(async move {
// Note: we wait for a client to connect.
server.connect().await?;
let mut server = BufReader::new(server);
let mut buf = String::new();
server.read_line(&mut buf).await?;
server.write_all(b"pong\n").await?;
Ok::<_, io::Error>(buf)
});
let client = tokio::spawn(async move {
// There's no need to use a connect loop here, since we know that the
// server is already up - `open` was called before spawning any of the
// tasks.
let client = ClientOptions::new().open(PIPE_NAME)?;
let mut read_buf = [0u8; 5];
let mut read_buf_cursor = 0;
let write_buf = b"ping\n";
let mut write_buf_cursor = 0;
loop {
let ready = client
.ready(Interest::READABLE | Interest::WRITABLE)
.await?;
if ready.is_readable() {
let buf = &mut read_buf[read_buf_cursor..];
match client.try_read(buf) {
Ok(n) => {
read_buf_cursor += n;
if read_buf_cursor == read_buf.len() {
break;
}
}
Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => {
continue;
}
Err(e) => {
return Err(e);
}
}
}
if ready.is_writable() {
let buf = &write_buf[write_buf_cursor..];
if buf.is_empty() {
continue;
}
match client.try_write(buf) {
Ok(n) => {
write_buf_cursor += n;
}
Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => {
continue;
}
Err(e) => {
return Err(e);
}
}
}
}
let buf = String::from_utf8_lossy(&read_buf).into_owned();
Ok::<_, io::Error>(buf)
});
let (server, client) = tokio::try_join!(server, client)?;
assert_eq!(server?, "ping\n");
assert_eq!(client?, "pong\n");
Ok(())
}
#[tokio::main]
async fn main() -> io::Result<()> {
#[cfg(windows)]
{
windows_main().await?;
}
#[cfg(not(windows))]
{
println!("Named pipes are only supported on Windows!");
}
Ok(())
}