1 files changed, 38 insertions, 0 deletions
diff --git a/third_party/rust/tokio-fs/src/file/open.rs b/third_party/rust/tokio-fs/src/file/open.rs
new file mode 100644
index 0000000000..197ec237af
--- /dev/null
+++ b/third_party/rust/tokio-fs/src/file/open.rs
@@ -0,0 +1,38 @@
+use super::File;
+
+use futures::{Future, Poll};
+
+use std::fs::OpenOptions as StdOpenOptions;
+use std::io;
+use std::path::Path;
+
+/// Future returned by `File::open` and resolves to a `File` instance.
+#[derive(Debug)]
+pub struct OpenFuture<P> {
+    options: StdOpenOptions,
+    path: P,
+}
+
+impl<P> OpenFuture<P>
+where P: AsRef<Path> + Send + 'static,
+{
+    pub(crate) fn new(options: StdOpenOptions, path: P) -> Self {
+        OpenFuture { options, path }
+    }
+}
+
+impl<P> Future for OpenFuture<P>
+where P: AsRef<Path> + Send + 'static,
+{
+    type Item = File;
+    type Error = io::Error;
+
+    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
+        let std = try_ready!(::blocking_io(|| {
+            self.options.open(&self.path)
+        }));
+
+        let file = File::from_std(std);
+        Ok(file.into())
+    }
+}