add smol example

2 files changed, 102 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index f6fd441..e1f75e8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,6 +13,9 @@ async-io = { version = "1.3", optional = true }
 async-process = { version = "1.0", optional = true }
 tokio = { version = "1.2", optional = true, features = ["fs", "process"] }
 
+[dev-dependencies]
+smol = "*"
+
 [features]
 default = ["std"]
 
diff --git a/examples/smol.rs b/examples/smol.rs
new file mode 100644
index 0000000..3f743bf
--- /dev/null
+++ b/examples/smol.rs
@@ -0,0 +1,99 @@
+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),
+    );
+}