Fix lifetimes for send/recv mmsg results

We keep a pointer to slices of receive buffers
inside MultHdrs which is used inside MultiResults so
those slices need to live at least as long as we want
to be able to use MultiResults

src/sys/socket/mod.rs

@@ -1440,7 +1440,7 @@ pub fn sendmsg<S>(fd: RawFd, iov: &[IoSlice<'_>], cmsgs: &[ControlMessage],
     target_os = "freebsd",
     target_os = "netbsd",
 ))]
-pub fn sendmmsg<'a, XS, AS, C, I,  S>(
+pub fn sendmmsg<'a, XS, AS, C, I, S>(
     fd: RawFd,
     data: &'a mut MultHdrs<S>,
     slices: XS,
@@ -1451,7 +1451,7 @@ pub fn sendmmsg<'a, XS, AS, C, I,  S>(
     flags: MsgFlags
 ) -> crate::Result<MultiResults<'a, S>>
     where
-        XS: IntoIterator<Item = I>,
+        XS: IntoIterator<Item = &'a I>,
         AS: AsRef<[Option<S>]>,
         I: AsRef<[IoSlice<'a>]> + 'a,
         C: AsRef<[ControlMessage<'a>]> + 'a,
@@ -1606,8 +1606,8 @@ pub fn recvmmsg<'a, XS, S, I>(
     mut timeout: Option<crate::sys::time::TimeSpec>,
 ) -> crate::Result<MultiResults<'a, S>>
 where
-    XS: IntoIterator<Item = I>,
-    I: AsRef<[IoSliceMut<'a>]>,
+    XS: IntoIterator<Item = &'a I>,
+    I: AsRef<[IoSliceMut<'a>]> + 'a,
 {
     let mut count = 0;
     for (i, (slice, mmsghdr)) in slices.into_iter().zip(data.items.iter_mut()).enumerate() {