Portability fixes

src/sys/aio.rs

@@ -30,14 +30,15 @@ use pin_utils::unsafe_pinned;
 use std::{
     convert::TryFrom,
     fmt::{self, Debug},
-    io::{IoSlice, IoSliceMut},
     marker::{PhantomData, PhantomPinned},
     mem,
     os::unix::io::RawFd,
     pin::Pin,
     ptr,
     thread
 };
+#[cfg(target_os = "freebsd")]
+use std::io::{IoSlice, IoSliceMut};
 use crate::sys::signal::*;
 use crate::sys::time::TimeSpec;
 
@@ -1185,16 +1186,24 @@ mod t {
         assert_eq!(aior.as_ref() as *const libc::aiocb,
                    &aior as *const AioRead as *const libc::aiocb);
 
+        let wbuf = [];
+        let aiow = AioWrite::new(666, 0, &wbuf, 0, sev);
+        assert_eq!(aiow.as_ref() as *const libc::aiocb,
+                   &aiow as *const AioWrite as *const libc::aiocb);
+    }
+
+    #[cfg(target_os = "freebsd")]
+    #[test]
+    fn casting_vectored() {
+        let sev = SigevNotify::SigevNone;
+
+        let mut rbuf = [];
         let mut rbufs = [IoSliceMut::new(&mut rbuf)];
         let aiorv = AioReadv::new(666, 0, &mut rbufs[..], 0, sev);
         assert_eq!(aiorv.as_ref() as *const libc::aiocb,
                    &aiorv as *const AioReadv as *const libc::aiocb);
 
         let wbuf = [];
-        let aiow = AioWrite::new(666, 0, &wbuf, 0, sev);
-        assert_eq!(aiow.as_ref() as *const libc::aiocb,
-                   &aiow as *const AioWrite as *const libc::aiocb);
-
         let wbufs = [IoSlice::new(&wbuf)];
         let aiowv = AioWritev::new(666, 0, &wbufs, 0, sev);
         assert_eq!(aiowv.as_ref() as *const libc::aiocb,