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-rw-r--r--third_party/rust/mio-0.6.23/src/io.rs35
1 files changed, 35 insertions, 0 deletions
diff --git a/third_party/rust/mio-0.6.23/src/io.rs b/third_party/rust/mio-0.6.23/src/io.rs
new file mode 100644
index 0000000000..275001387d
--- /dev/null
+++ b/third_party/rust/mio-0.6.23/src/io.rs
@@ -0,0 +1,35 @@
+// Re-export the io::Result / Error types for convenience
+pub use std::io::{Read, Write, Result, Error, ErrorKind};
+
+// TODO: Delete this
+/// A helper trait to provide the map_non_block function on Results.
+pub trait MapNonBlock<T> {
+ /// Maps a `Result<T>` to a `Result<Option<T>>` by converting
+ /// operation-would-block errors into `Ok(None)`.
+ fn map_non_block(self) -> Result<Option<T>>;
+}
+
+impl<T> MapNonBlock<T> for Result<T> {
+ fn map_non_block(self) -> Result<Option<T>> {
+ use std::io::ErrorKind::WouldBlock;
+
+ match self {
+ Ok(value) => Ok(Some(value)),
+ Err(err) => {
+ if let WouldBlock = err.kind() {
+ Ok(None)
+ } else {
+ Err(err)
+ }
+ }
+ }
+ }
+}
+
+#[cfg(feature = "with-deprecated")]
+pub mod deprecated {
+ /// Returns a std `WouldBlock` error without allocating
+ pub fn would_block() -> ::std::io::Error {
+ ::std::io::ErrorKind::WouldBlock.into()
+ }
+}