Add missing items in FreeBSD

Author: GuillaumeGomez

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

@@ -50,6 +50,8 @@ pub type sctp_assoc_t = u32;
 
 pub type eventfd_t = u64;
 
+pub type seqc_t = u32;
+
 #[cfg_attr(feature = "extra_traits", derive(Debug, Hash, PartialEq, Eq))]
 #[repr(u32)]
 pub enum devstat_support_flags {
@@ -1355,6 +1357,44 @@ s! {
         pub strchange_instrms: u16,
         pub strchange_outstrms: u16,
     }
+
+    pub struct filedesc {
+        pub fd_files: *mut fdescenttbl,
+        pub fd_map: *mut c_ulong,
+        pub fd_freefile: c_int,
+        pub fd_refcnt: c_int,
+        pub fd_holdcnt: c_int,
+        fd_sx: sx,
+        fd_kqlist: kqlist,
+        pub fd_holdleaderscount: c_int,
+        pub fd_holdleaderswakeup: c_int,
+    }
+
+    pub struct fdescenttbl {
+        pub fdt_nfiles: c_int,
+        fdt_ofiles: [*mut c_void; 0],
+    }
+
+    #[doc(hidden)]
+    pub struct sx {
+        lock_object: lock_object,
+        sx_lock: crate::uintptr_t,
+    }
+
+    #[doc(hidden)]
+    pub struct lock_object {
+        lo_name: *const c_char,
+        lo_flags: c_uint,
+        lo_data: c_uint,
+        // This is normally `struct  witness`.
+        lo_witness: *mut c_void,
+    }
+
+    #[doc(hidden)]
+    pub struct kqlist {
+        tqh_first: *mut c_void,
+        tqh_last: *mut *mut c_void,
+    }
 }
 
 s_no_extra_traits! {