Do not assume glibc version of msghdr

The msghdr struct definition varies between glibc and musl. Fix the
usage of the struct in the code to make it compatible with both.

Signed-off-by: Jens Reidel <[email protected]>

Author: Gelbpunkt

src/io/sendmsg.rs

@@ -55,11 +55,11 @@ impl<T: BoundedBuf, U: BoundedBuf> Op<SendMsg<T, U>> {
         match msg_control {
             Some(ref _msg_control) => {
                 msghdr.msg_control = _msg_control.stable_ptr() as *mut _;
-                msghdr.msg_controllen = _msg_control.bytes_init();
+                msghdr.msg_controllen = _msg_control.bytes_init() as _;
             }
             None => {
                 msghdr.msg_control = std::ptr::null_mut();
-                msghdr.msg_controllen = 0_usize;
+                msghdr.msg_controllen = 0;
             }
         }
 

src/io/sendmsg_zc.rs

@@ -62,11 +62,11 @@ impl<T: BoundedBuf, U: BoundedBuf> Op<SendMsgZc<T, U>, MultiCQEFuture> {
         match msg_control {
             Some(ref _msg_control) => {
                 msghdr.msg_control = _msg_control.stable_ptr() as *mut _;
-                msghdr.msg_controllen = _msg_control.bytes_init();
+                msghdr.msg_controllen = _msg_control.bytes_init() as _;
             }
             None => {
                 msghdr.msg_control = std::ptr::null_mut();
-                msghdr.msg_controllen = 0_usize;
+                msghdr.msg_controllen = 0;
             }
         }