async tests

1 files changed, 84 insertions, 0 deletions

diff --git a/tests/fds_async.rs b/tests/fds_async.rs
new file mode 100644
index 0000000..e2c369d
--- /dev/null
+++ b/tests/fds_async.rs
@@ -0,0 +1,84 @@
+#[cfg(feature = "async")]
+#[test]
+fn test_fds_async() {
+    use async_std::io::prelude::BufReadExt as _;
+
+    check_open_fds(&[0, 1, 2]);
+
+    // run once to ensure all of the fds in the async_std machinery are
+    // allocated
+    async_std::task::block_on(async {
+        let pty = pty_process::Pty::new().unwrap();
+        pty.resize(pty_process::Size::new(24, 80)).unwrap();
+        let mut child = pty_process::Command::new("perl")
+            .arg("-Efor my $fd (0..255) { open my $fh, \"<&=$fd\"; print $fd if stat $fh }; say")
+            .spawn(&pty)
+            .unwrap();
+        let mut buf = vec![];
+        async_std::io::BufReader::new(&pty)
+            .read_until(b'\n', &mut buf)
+            .await
+            .unwrap();
+        assert_eq!(&buf, b"012\r\n");
+        let status = child.status().await.unwrap();
+        assert_eq!(status.code().unwrap(), 0);
+    });
+
+    async_std::task::block_on(async {
+        let fds = get_open_fds();
+
+        let pty = pty_process::Pty::new().unwrap();
+        pty.resize(pty_process::Size::new(24, 80)).unwrap();
+        let mut child = pty_process::Command::new("perl")
+            .arg("-Efor my $fd (0..255) { open my $fh, \"<&=$fd\"; print $fd if stat $fh }; say")
+            .spawn(&pty)
+            .unwrap();
+        let mut buf = vec![];
+        async_std::io::BufReader::new(&pty)
+            .read_until(b'\n', &mut buf)
+            .await
+            .unwrap();
+        assert_eq!(&buf, b"012\r\n");
+        let status = child.status().await.unwrap();
+        assert_eq!(status.code().unwrap(), 0);
+        drop(pty);
+
+        check_open_fds(&fds);
+    });
+
+    async_std::task::block_on(async {
+        let fds = get_open_fds();
+
+        let pty = pty_process::Pty::new().unwrap();
+        pty.resize(pty_process::Size::new(24, 80)).unwrap();
+        let mut child = pty_process::Command::new("perl")
+            .arg("-Efor my $fd (0..255) { open my $fh, \"<&=$fd\"; print $fd if stat $fh }; say")
+            .stderr(Some(std::process::Stdio::null()))
+            .spawn(&pty)
+            .unwrap();
+        let mut buf = vec![];
+        async_std::io::BufReader::new(&pty)
+            .read_until(b'\n', &mut buf)
+            .await
+            .unwrap();
+        assert_eq!(&buf, b"012\r\n");
+        let status = child.status().await.unwrap();
+        assert_eq!(status.code().unwrap(), 0);
+        drop(pty);
+
+        check_open_fds(&fds);
+    });
+}
+
+#[cfg(feature = "async")]
+#[track_caller]
+fn check_open_fds(expected: &[i32]) {
+    assert_eq!(get_open_fds(), expected);
+}
+
+#[cfg(feature = "async")]
+fn get_open_fds() -> Vec<i32> {
+    (0..=255)
+        .filter(|fd| nix::sys::stat::fstat(*fd).is_ok())
+        .collect()
+}