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use pty_process::Command as _;
use smol::io::{AsyncReadExt as _, AsyncWriteExt as _};
use std::os::unix::io::AsRawFd as _;
use std::os::unix::process::ExitStatusExt as _;
struct RawGuard {
termios: nix::sys::termios::Termios,
}
impl RawGuard {
fn new() -> Self {
let stdin = std::io::stdin().as_raw_fd();
let termios = nix::sys::termios::tcgetattr(stdin).unwrap();
let mut termios_raw = termios.clone();
nix::sys::termios::cfmakeraw(&mut termios_raw);
nix::sys::termios::tcsetattr(
stdin,
nix::sys::termios::SetArg::TCSANOW,
&termios_raw,
)
.unwrap();
Self { termios }
}
}
impl Drop for RawGuard {
fn drop(&mut self) {
let stdin = std::io::stdin().as_raw_fd();
let _ = nix::sys::termios::tcsetattr(
stdin,
nix::sys::termios::SetArg::TCSANOW,
&self.termios,
);
}
}
async fn run(
child: &pty_process::async_std::Child,
) -> std::result::Result<(), Box<dyn std::error::Error>> {
let _raw = RawGuard::new();
let ex = smol::Executor::new();
let input = ex.spawn(async {
let mut buf = [0_u8; 4096];
let mut stdin = smol::Unblock::new(std::io::stdin());
loop {
match stdin.read(&mut buf).await {
Ok(bytes) => {
child.pty().write(&buf[..bytes]).await.unwrap();
}
Err(e) => {
eprintln!("stdin read failed: {:?}", e);
break;
}
}
}
});
let output = ex.spawn(async {
let mut buf = [0_u8; 4096];
let mut stdout = smol::Unblock::new(std::io::stdout());
loop {
match child.pty().read(&mut buf).await {
Ok(bytes) => {
stdout.write_all(&buf[..bytes]).await.unwrap();
stdout.flush().await.unwrap();
}
Err(e) => {
// EIO means that the process closed the other
// end of the pty
if e.raw_os_error() != Some(libc::EIO) {
eprintln!("pty read failed: {:?}", e);
}
break;
}
}
}
});
ex.run(smol::future::or(input, output)).await;
Ok(())
}
fn main() {
let status = smol::block_on(async {
let mut child = smol::process::Command::new("sleep")
.args(&["500"])
.spawn_pty(Some(&pty_process::Size::new(24, 80)))
.unwrap();
run(&child).await.unwrap();
child.status().await.unwrap()
});
std::process::exit(
status
.code()
.unwrap_or_else(|| status.signal().unwrap_or(0) + 128),
);
}
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