net: add types for named Unix pipes

tokio/src/net/unix/mod.rs

@@ -1,4 +1,4 @@
-//! Unix domain socket utility types.
+//! Unix specific network types.
 // This module does not currently provide any public API, but it was
 // unintentionally defined as a public module. Hide it from the documentation
 // instead of changing it to a private module to avoid breakage.
@@ -22,6 +22,8 @@ pub(crate) use stream::UnixStream;
 mod ucred;
 pub use ucred::UCred;
 
+pub mod pipe;
+
 /// A type representing process and process group IDs.
 #[allow(non_camel_case_types)]
 pub type uid_t = u32;