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mod raw_guard;
mod main {
use std::io::{Read as _, Write as _};
use std::os::fd::{AsFd as _, AsRawFd as _};
pub fn run(
child: &mut std::process::Child,
pty: &mut pty_process::blocking::Pty,
) {
let _raw = super::raw_guard::RawGuard::new();
let mut buf = [0_u8; 4096];
let pty_fd = pty.as_fd().as_raw_fd();
let stdin_fd = std::io::stdin().as_raw_fd();
loop {
let mut set = nix::sys::select::FdSet::new();
set.insert(pty_fd);
set.insert(stdin_fd);
match nix::sys::select::select(
None,
Some(&mut set),
None,
None,
None,
) {
Ok(n) => {
if n > 0 {
if set.contains(pty_fd) {
match pty.read(&mut buf) {
Ok(bytes) => {
let buf = &buf[..bytes];
let stdout = std::io::stdout();
let mut stdout = stdout.lock();
stdout.write_all(buf).unwrap();
stdout.flush().unwrap();
}
Err(e) => {
eprintln!("pty read failed: {e:?}");
break;
}
};
}
if set.contains(stdin_fd) {
match std::io::stdin().read(&mut buf) {
Ok(bytes) => {
let buf = &buf[..bytes];
pty.write_all(buf).unwrap();
}
Err(e) => {
eprintln!("stdin read failed: {e:?}");
break;
}
}
}
}
}
Err(e) => {
println!("select failed: {e:?}");
break;
}
}
match child.try_wait() {
Ok(Some(_)) => break,
Ok(None) => {}
Err(e) => {
println!("wait failed: {e:?}");
break;
}
}
}
}
}
fn main() {
use std::os::unix::process::ExitStatusExt as _;
let mut pty = pty_process::blocking::Pty::new().unwrap();
let pts = pty.pts().unwrap();
pty.resize(pty_process::Size::new(24, 80)).unwrap();
let mut child = pty_process::blocking::Command::new("tac")
// .args(&["500"])
.spawn(&pts)
.unwrap();
main::run(&mut child, &mut pty);
let status = child.wait().unwrap();
std::process::exit(
status
.code()
.unwrap_or_else(|| status.signal().unwrap_or(0) + 128),
);
}
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