Fix casting on DragonFly

Author: strangelittlemonkey

src/unix/bsd/freebsdlike/dragonfly/mod.rs

@@ -19,6 +19,8 @@ pub type sem_t = *mut sem;
 
 pub enum sem {}
 
+use dox::mem;
+
 s! {
 
     pub struct exit_status {
@@ -799,25 +801,25 @@ f! {
     }
 
     pub fn CMSG_LEN(length: ::c_uint) -> ::c_uint {
-        _CMSG_ALIGN(mem::size_of::<::cmsghdr>()) + length as usize
+       (_CMSG_ALIGN(mem::size_of::<::cmsghdr>()) + length as usize) as u32
     }
 
     pub fn CMSG_NXTHDR(mhdr: *const ::msghdr, cmsg: *const ::cmsghdr)
         -> *mut ::cmsghdr
     {
-        let next = cmsg as usize + _CMSG_ALIGN((*cmsg).cmsg_len)
+        let next = cmsg as usize + _CMSG_ALIGN((*cmsg).cmsg_len as usize)
             + _CMSG_ALIGN(mem::size_of::<::cmsghdr>());
         let max = (*mhdr).msg_control as usize
             + (*mhdr).msg_controllen as usize;
         if next <= max {
-            (cmsg as usize + _CMSG_ALIGN((*cmsg).cmsg_len)) as *mut ::cmsghdr
+            (cmsg as usize + _CMSG_ALIGN((*cmsg).cmsg_len as usize)) as *mut ::cmsghdr
         } else {
             0 as *mut ::cmsghdr
         }
     }
 
     pub fn CMSG_SPACE(length: ::c_uint) -> ::c_uint {
-        _CMSG_ALIGN(mem::size_of::<::cmsghdr>()) + _CMSG_ALIGN(length as usize)
+        (_CMSG_ALIGN(mem::size_of::<::cmsghdr>()) + _CMSG_ALIGN(length as usize)) as u32
     }
 }