impl Send and Sync for IoVec

CHANGELOG.md

@@ -6,6 +6,10 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 ## [Unreleased] - ReleaseDate
 
 ### Added
+
+- `sys::uio::IoVec` is not `Send` and `Sync`
+  (#[1582](https://github.com/nix-rust/nix/pull/1582))
+
 ### Changed
 ### Fixed
 

src/sys/uio.rs

@@ -221,3 +221,8 @@ impl<'a> IoVec<&'a mut [u8]> {
         }, PhantomData)
     }
 }
+
+// The only reason IoVec isn't automatically Send+Sync is because libc::iovec
+// contains raw pointers.
+unsafe impl<T> Send for IoVec<T> where T: Send {}
+unsafe impl<T> Sync for IoVec<T> where T: Sync {}